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WATER RECLAMATION FACILITYISCLT DISPERSION MODELING

AND FATE EVALUATIONFOR VOC CONTAMINATION

ALCOA-DAVENPORT WORKSRIVERDALE, IOWA

Submitted to:

Aluminum Company of AmericaDavenport WorksRiverdale, Iowa

March 1992

Submitted by:

GERAGHTY & MILLER, INCEnvironmental Services6209 Riverside DriveDublin, Ohio 43017

(614) 764-2310

ALUMINUM COMPANY OF AMERICAP.O. BOX 3567

PAVENPORT, IOWA 52808 ALCOA

(319) 359-2000

March 27, 1992

James Colbert , . ir \jSuperfund BranchUSEPA Region VII ^AR 3 Q726 Minnesota Ave.Kansas City, Kansas 66101 gEM

Dear Jim:

Enclosed for your information are three copies of the report "Water Reclamation Facility ISCLTDispersion Modeling and Fate Evaluation for VOC Contamination, Alcoa-Davenport Works,Riverdale, Iowa" dated March, 1992.

7The issue of VOCs in our well water system was an agei-.da item in our November 21, 1991, meetingin Kansas City. In that meeting, we discussed the fact that VOCs in the bed rock aquifer are beingremoved by our process water wells. The VOCs are transported through the plant mill water systemand are partially volatilized at the water reclamation system as discussed in the enclosed report.However, removal is not complete and residual VOCs are discharged in our NPDES permittedoutfalls. This carry-through occasionally causes NPDES permit excursions.

Because the VOCs are impacting NPDES program compliance, EPA agreed in the November 21,1991, meeting that resolution of this problem could be addressed under the Iowa Department ofNatural Resources' (IDNR) NPDES authority instead of including it as a CERCLA Consent Orderitem. Based on that agreement, we are working with IDNR on development of a treatment system forremoving VOCs from the well water. An engineering report received from Geraghty & Miller wassubmitted to Darrel McAllister, IDNR, on March 9, 1992, and we will be meeting with them in thenear future to discuss the proposal in detail. A system will be installed according to a schedule yet tobe worked out with IDNR.

You asked in the November meeting to be kept apprised of our activities even though IDNR will bethe lead regulatory agency for this project. This letter should provide you with an update as to thestatus to date. I will keep you advised as we finalize an agreement with IDNR. In the meantime, ifyou have any questions, please do not hesitate to call.

Yours truly,

Marshall SonksenSr. Staff Envir. Engr.

cc: G.O. PrattT.P. Andersen, Geraghty & Miller

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WATER RECLAMATION FACILITYISCLT DISPERSION MODELING

AND FATE EVALUATIONFOR VOC CONTAMINATION

ALCOA-DAVENPORT WORKSRIVERDALE, IOWA

March 1992

Geraghty & Miller, Inc. is submitting this report to Aluminum Company of America

for work performed at the Davenport Works. The report was prepared in conformance with

Geraghty & Miller's strict quality assurance/quality control procedures to ensure that the

report meets the highest standards in terms of the methods used and the information

presented. If you have any questions or comments concerning this report, please contact

one of the individuals listed below.

Respectfully submitted,

GERAGHTY & MILLER, INC.

abertProject Engineer/Air Quality Group

Thomas P. AndersonProject Scientist/Project Manager

GERAGHTY & MILLER, INC.

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TABLE OF CONTENTS

Page

1.0 INTRODUCTION 1

2.0 WATER RECLAMATION FACILITY DESCRIPTION 3

3.0 SAMPLING METHODOLOGY 4

4.0 ANALYTICAL RESULTS AND CONTAMINANT FATE EVALUATION ... 6

5.0 AIR MODELING AND RISK EVALUATION 85.1 AIR MODELING METHODOLOGY 85.2 AIR MODELING RESULTS 105.3 RISK EVALUATION 12

6.0 PRINCIPLE FINDINGS 15

7.0 REFERENCES 17

LIST OF FIGURES

FIGURE

1

2

3

4

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TITLE

Water Reclamation Facility Site Map.

Mill Water and Water Reclamation Facility Flow Diagram.

Average Total VOC Mass Balance Flow Diagram.

Windrose.

General Isopleths and Facility Perimeter Receptors.

LIST OF TABLES

TABLE

1

TITLE

Summary Table of Analytical Results from Water Quality Sampling,Mill Water System and Water Reclamation Facility.

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TABLE OF CONTENTS(Continued)

LIST OF TABLES(Continued)

* TABLE TITLE

I 2 Summary Table of VOC Mass-Per-Year Calculations.

_ 3 Mass Balance Analysis of Contaminants in the Mill Water and WaterI Reclamation Facility, Two Sceneries.

M 4 Volatile Organic Compound Analytical Data for Sample Point S7.

5 Volatile Organic Compound Analytical Data for Sample Point Sll.

6 Volatile Organic Compound Analytical Data for Sample Points S12and S13.

7 Volatile Organic Compound Analytical Data for Field Blanks.I

1 8 Volatile Organic Compound Analytical Data - Summary of MaximumValues.

1 9 Volatile Organic Compound Analytical Data - Summary of MaximumValues.

1 10 Volatile Organic Compound Analytical Data - Summary of AverageValues.

I 11 Volatile Organic Compound Analytical Data - Summary of Average™ Mass Emission Rates.

I 12 Summary of ISCLT Dispersion Modeling Results.

_ 13 ISCLT Predicted Maximum On-Site Annual Average Ambient• Concentration.

1 14 ISCLT Predicted Maximum Perimeter Annual Average AmbientConcentration.

15 Summary of Maximum Potential Source Impact.

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TABLE

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APPENDIX

A

B

TABLE OF CONTENTS(Continued)

LIST OF TABLES(Continued)

TITLE

Cancer Risk Estimates for an Adult Resident and Site Worker, Pointof Maximum Impact, Air Emissions.

Hazard Quotients and Hazard Index for an Adult Resident and SiteWorker, Point of Maximum Impact, Air Emissions.

Exposure to Onsite Workers, Air Releases from the WaterReclamation Facility, Comparison of Two Sampling and ModelingEvents.

LIST OF APPENDICES

TITLE

GEP Program Description.

ISCLT Dispersion Modeling Output.

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1.0 INTRODUCTION

Water samples were collected from ground-water supply wells and from several

locations within Alcoa's Mill Water System and Water Reclamation Facility. The data was

used for two purposes, (1) to evaluate the fate of contaminants in the Mill Water and Water

Reclamation Facility and (2) to conduct modeling and a risk evaluation of air emissions

from the Water Reclamation Facility.

The fate of contaminants was evaluated using mass balance calculations of dissolved

contaminant movement as it leaves its source, Alcoa production wells, and travels through

the Mill Water System and Water Reclamation Facility. Mass balance calculations were

made using measured and estimated flow rates and conservative assumptions of contaminant

movement in the system. This evaluation did not, however, conservatively assume that

contaminants will continuously and completely volatilize to the atmosphere, as was required

for the air modeling and risk evaluation. This fate evaluation was completed to provide a

realistic understanding of how contamination may move through the water systems at Alcoa

and identify where contaminants might be released.

Air modeling estimated the transfer of contaminants from water to the atmosphere

using a conservative mass balance evaluation. The focus was on the mass and rate of

contaminants discharging to the atmosphere and the risks posed once they reach the

atmosphere. Source emission rates were determined for the .cooling tower and clarifier

sources at the Water Reclamation Facility. This was accomplished by calculating a mass

emission rate for each source based on the water flow rates and the aqueous volatile organic

compound (VOC) concentration gradient for each source at the Water Reclamation Facility.

These procedures conservatively assumed that the entire VOC gradient is evolved to the

atmosphere directly at the Water Reclamation Facility sources. The Industrial Source

Complex Long Term (ISCLT) air quality dispersion model was subsequently utilized to

predict annual average ambient air concentrations of the constituents emitted from the

Water Reclamation Facility for a receptor grid and facility perimeter receptor locations.

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I™ A Good Engineering Practice (GEP), wake area evaluation was performed by the

• Geraghty & Miller, Inc. Air Quality Group (GMAQG) for the clarifier tank and water

cooling towers. The results from the wake analysis were used as input to allow

• determination of building wake effects from the Foil Mill and surrounding buildings on

plume dispersion. Historical site-specific meteorological data for the year 1988 was obtained

• and utilized in the ISCLT modeling procedure. The results from this analysis have been

used as input to a screening health risk evaluation of air pathway emissions.

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2.0 WATER RECLAMATION FACILITY DESCRIPTION

The Water Reclamation Facility recycles water from Alcoa's Mill Water System. The

Mill Water System is used for non-contact cooling water, contact process water and to

supplement fire protection needs. The Water Reclamation Facility is located in the south-

central portion of the Alcoa facility as shown on Figure 1. Figure 1 also contains a blow-up

which illustrates the layout of the Facility. Figure 2 contains a flow chart which illustrates

flow within the Mill Water System and Water Reclamation Facility.

Mill water enters the Water Reclamation Facility at the clarifier. From the clarifier,

in May through October, the water is routed through the two cooling towers and then

recycled back to the Mill Water System. During the cooler months (November through

April) the water bypasses the cooling towers. Approximately 20 percent of the mill water

is lost during the water reclamation process. This water enters National Pollutant Discharge

Elimination System (NPDES) Outfall 004 as blowdown or overflow from the Water

Reclamation Facility.

Recycled water from the Water Reclamation Facility is the main source of water for

the Mill Water System. There are two additional water sources for the Mill Water System,

the Mississippi River water intake and ground-water supply wells. They replace water that

is lost to Outfall 004 at the Water Reclamation Facility or lost from cooling and process use

that discharge directly to Outfall 006. The ground-water supply wells are pumped at higher

rates during the warm months (May through October) since they provide a source of cool

water. During the cool months (November through April) only one well, PW-6, is normally

pumping. This well is left on to maintain a cone-of-depression in the aquifer which captures

contaminated ground water that might otherwise move off site. Prior to 1989 the wells were

shut down during the winter months.

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3.0 SAMPLING METHODOLOGY

Water samples were collected at six locations within the Mill Water System and

Water Reclamation Facility, designated S-3, S-4, S-7, S-ll, S-12, and S-13 on Figure 2. One

sample was collected each week for five consecutive weeks starting the second week in July

1991 and ending the second week in August 1991. However only one sample was retained

from location designated S-13 due to intermittant flow at this point. Results from sampling

points designated S-3 (Well PW-6), S-4 (Well PW-5), and S-13 (blowdown and overflow

from the Water Reclamation Facility) were used for the contaminant fate evaluation only.

Results from sampling points S-7 (inlet to the water clarifier), S-ll (outlet from water

clarifier, inlet to cooling towers) and S-12 (outlet from the cooling towers) were used for

both air dispersion modeling and the contaminant fate evaluation.

All samples were collected in laboratory supplied 120 milliliter(ml) glass vials with

teflon lined caps. Samples jars were filled directly at each location without the use of any

intermediate sampling equipment. The sampling crew wore new latex gloves at each

sampling point to prevent cross-contamination.

Samples from PW-5 and PW-6 (designated S-4 and S-3, respectively) were filled from

in-line sampling ports at the well head. The wells were operating at capacity throughout the

five week period that samples were collected. Flow rates at each well were calculated from

the in-line flow meters.

The sample at the inlet to the water clarifier (S-7) was collected from the top-center

of the clarifier where water first enters. This location was accessed from a walkway that

ends at the center of the clarifier. The clarifier outlet/cooling tower inlet sample (S-ll) was

collected from the top edge of the clarifier where clarified water drops out to enter the

cooling towers. The sample from the outlet of the cooling towers (S-12) was filled from the

cold well, where water accumulates after flowing out of the cooling towers. The Water

Reclamation Facility blowdown and overflow (S-13) was collected from the end of the piping

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I• where the water enters Outfall 004. No flow measurements were taken from the sample

• points (S-7, S-ll, S-12, and S-13) at the Water Reclamation Facility because the flow meters

in the system were not functioning properly. The flow rates used were supplied by Alcoa

• and are estimates based on their knowledge of the system.

• All samples were shipped overnight courier to Wadsworth/Alert Laboratories in

North Canton, Ohio for analysis for volatile organic compounds using EPA Method 624.

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IIIIIIIIIIIIIIII• The water sampling for this project was completed under conditions consistent with

Scenerio 1, when PW-5 and the cooling tower were both active. The mass per day values

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4.0 ANALYTICAL RESULTS AND CONTAMINANT FATE EVALUATION

This section presents the analytical data from water sampling, identifies the sources

of contaminated water and presents an evaluation of the fate of contaminants using mass

balance calculations. This evaluation was conducted independent of the more conservative

mass balance calculations that were used for the air modeling and risk evaluation presented

in Section 5.0. This section will walk the reader through the mass balance evaluation

analysis. To follow the steps taken and calculations made, the reader must utilize the

information provided in the flow charts (Figures 2 and 3) and Tables 1, 2, and 3. The

principal findings of the mass balance analysis are presented in Section 6.0

Table 1 lists the analytical results from five sampling events. Figure 2 illustrates the

relative location of each of these sampling points. Table 1 also presents an average and

maximum mass of contaminants in pounds per day at each location. The mass per day

values presented in Table 1 represent the contaminant mass through each sampling point

based on actual sampling data and the best available flow measurements or estimates from

July and August 1991.

Depending on the season, one of two flow scenerios exist for the Mill Water System

and Water Reclamation Facility. In the warm months (Scenerio 1) May through October,

there is a greater need for cool water and Alcoa will maximize their use of ground water

which is a cool water source. Therefore PW-5 will be active in addition to PW-6, which is

active year round. The cooling towers at the Water Reclamation Facility will also be

operated. During the cold months (Scenerio 2), the need for cool water is lower. PW-5 is

inactive and the cooling towers are shut down. Because PW-5 is a significant VOC

contaminant source and the cooling towers are very effective at removing VOCs from the

water, the total mass and fate of contaminants is much different for each scenerio.

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presented in Table 1, therefore, are representative of Scenerio 1. This data represents the

maximum total mass of contaminants and the conservative data necessary for the air

modeling evaluation.

To estimate the total mass per year values for VOCs requires adding the daily values

estimated for Scenarios 1 and 2, assuming each is active half the year. Using the mass per

day values for the contamination sources (PW-5 and PW-6), mass per year values were

calculated assuming PW-5 is active only six months during the year. These values are listed

on Table 2. Based on an average of the five sampling episodes and assuming PW-5 is active

only six months, the average total VOC mass per year from combined sources (PW-5 and

PW-6) is approximately 9,800 pounds (Table 2).

Assuming the VOC mass contribution from PW-5 to the water entering the Water

Reclamation Facility at the water clarifier is only six months of the year, the average total

VOC mass per year entering the clarifier and the cooling towers is approximately 12,000

pounds (Table 2). Then if it is assumed when PW-5 is inactive, the cooling towers are also

inactive, the total VOC mass per year leaving or bypassing (depending on the time of year)

the cooling towers is approximately 3,129 pounds. This VOC mass is recycled into the Mill

Water System. Approximately 3,000 gallons per minute (gpm) is discharged as overflow to

Outfall 004, resulting in a discharge of approximately 1,325 pounds per year total VOCs.

A comparison of the two flow scenarios and the average mass of VOCs per day is

listed on Table 3 and illustrated on Figure 3. During the six months of the year when PW-5

is active (Scenario 1), despite the increased mass of VOCs in the Mill Water System from

PW-5, the average total VOCs recycled to the Mill Water System from the Water

Reclamation Facility is low because the cooling towers are very effective at volatilizing the

VOCs to the atmosphere. When PW-5 and the cooling towers are inactive (Scenario 2), the

VOCs from PW-6 are not volatilized to the atmosphere, and therefore, will be recycled

through to the Mill Water System. Once in the Mill Water, the VOCs can show up in the

direct discharge to Outfall 006, as explained in Section 2.0.

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5.0 AIR MODELING AND RISK EVALUATION

5.1 AIR MODELING METHODOLOGY

The Alcoa Davenport Works uses water throughout the facility in a closed loop

process. Ground water is circulated to the Water Reclamation Facility with additional

sources of process water. Volatile organic compounds present may be released to the

atmosphere at the Water Reclamation Facility when the ground-water wells are operational.

Process operations are such that -the Water Reclamation Facility is currently utilizing

contaminated ground water year round, not on a seasonal basis as previously modeled

(Geraghty & Miller, January 1990). Annual average ambient ground-level concentrations

were predicted by ISCLT air quality dispersion modeling using an arbitrary mass emission

rate of 1 gram per second (g/s) from each source. Actual ambient air concentration values

for the constituents of concern were subsequently ratioed from the results of these runs.

The sources under investigation include the water clarifier and cooling towers of the

Water Reclamation Facility. Figure 1 illustrates source locations. The water clarifier and

cooling towers were modeled assuming a water flow rate of 15,300 gpm and the

concentration gradients, based upon the sampling results obtained from mass balance points

S-7, S-ll, and S-12, respectively. A general flow diagram illustrating the sampling points is

presented in Figure 2.

It should be noted that a strict mass balance would also include overflow and blow-

down associated with stream S-13. Due to the intermittent operation of this flow stream,

it was omitted from the source emission rate determinations. Performing the mass balance

in this manner assures the most conservative bias on mass emissions, since any VOC

concentration gradient is assumed to be lost via the air pathway at the appropriate water

reclamation source. Potential biological or chemical degradation of the compounds was not

considered, and would have the effect of reducing the portion of emissions released via air.

This conservative approach provides an assessment of potential worst case conditions.

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The ISCLT model has an option permitting evaluation of the wake effects of "nearby"

buildings on source emissions. Nearby is defined as five times the lessor of building height

or projected cross-wind width. The Foil Mill Water Reclamation office, and an additional

small support building, were determined to meet the "nearby" criteria for both sources. The

building wake evaluation data including a brief program description as provided by Bowman

Environmental Engineering is presented in Appendix A. Due to the influence of wake

effects on plume dispersion, it was more conservative to model the cooling tower source as

two separate units.

Although the water clarifier is in close proximity to facility buildings, the ISCLT

program algorithm will not permit building wake effects to be analyzed for area sources.

To assess the potential impact of building wake effects on this source, the tank was modeled

as a series of individual point sources influenced by downwash. The source was also

modeled as an area source with no influence from the nearby buildings. The results from

the area source modeling analysis are presented in this report due to their more

conservative predictions of ground-level ambient concentrations.

The meteorological requirements of the model were satisfied by a stability array

(STAR) deck processed from National Climatic Data Center (NCDC) data for 1988 for the

Moline, Illinois surface National Weather Service Station (14923) obtained from U.S.

Environmental Protection Agency's (USEPA) Support Center for Regulatory Air Models

(SCRAM). The 1988 data represents the most current complete year of data available. The

STAR deck contains the percent frequency of occurrence information for wind speed and

direction as classified by the six Pasquill Stability Classes. The STAR data is represented

by the annual Windrose illustrated in Figure 4. The summary table included in Figure 4

presents the percent frequency of occurrence data for wind speed and direction used in

generation of the Windrose.

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5.2 AIR MODELING RESULTS

The source impact analysis is based upon a combination of ground-water sampling

and air quality dispersion modeling. Tables 4, 5, and 6 summarize the data collected from

sampling locations S-7 (inlet to clarifier), S-ll (outlet from clarifier, inlet to cooling towers),

and S-12 (outlet from cooling towers). The maximum and average concentrations observed

during sampling are presented. Table 7 summarizes the results from field blank analysis.

No compounds were detected above the analytical detection limit.

To interpret the results from ground-water sampling, the outlet concentrations are

subtracted from the inlet concentrations. Tables 8 and 9 present the calculation of the

maximum and average concentration gradients. Review of this data illustrates for the water

clarifier source numerous compounds detected in the effluent at higher levels than in the

influent. Biological reactions or other chemically mediated phenomena may explain this

occurrence.

Table 10 summarizes the calculation of average mass emission rates for the clarifier

and cooling tower sources. The concentration gradient in micrograms per liter (/xg/L) was

multiplied by the water flow rate to yield a source emission rate in g/s. Emission rates were

based on a 15,300 gpm throughput for all sources. Mass emission rates for compounds

potentially generated in the clarifier are denoted by the letters "EEI" meaning effluent

exceeded influent.

The following compounds showed ambient losses via volatilization between the inlet

and outlet of the clarifier: 1,1,2,2-tetrachloroethane; tetrachloroethene; and vinyl chloride.

The maximum mass emission rate was 0.009 g/s for the compound tetrachloroethene which

is the major constituent of concern at the site.

The following compounds showed ambient losses via volatilization between the inlet

and outlet of the cooling towers: bromodichloromethane; chloroform; 1,1,-dichloroethane;

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1,2-dichloroethene (total); tetrachloroethene; toluene; trichlorethene; and vinyl chloride.

The maximum mass emission rate was 0.1 g/s for the compound tetrachloroethene. The

results of source emission calculations for the clarifier and cooling towers are summarized

in Table 11.

Air quality dispersion modeling was performed for the sources using an arbitrary

mass emission rate of 1 g/s per source. Performing the modeling in this manner permits

ambient concentrations for all compounds of concern to be ratioed from a single modeling

run. The results from modeling the 1 g/s mass emission rate are summarized in Table 12.

The absolute maximum concentrations are presented for each source. Ten additional

receptor locations were specified at the facility perimeter. The complete modeling output

is included as Appendix B. Figure 5 depicts concentration isopleths in micrograms per cubic

meter (/xg/m3) for the combined clarifier and cooling tower emissions based on an arbitrary

emission rate of 1 g/s per source.

Tables 13 and 14 present the combination of mass emission rate calculations and

dispersion modeling results. The maximum on-site and perimeter concentrations are

presented for each source individually using the average source mass emission rates.

The maximum annual average on-site ground-level concentrations predicted by

ISCLT for the water clarifier source was located at coordinate 900, -700. Annual ground-

level ambient constituent concentration values at the maximum location ranged between a

low of 5.18 x 10'2 Mg/m3 for 1,1,2,2-tetrachloroethane to 4.69 x 10'1 /ig/m3 for

tetrachloroethene. The maximum annual average ground-level concentration predicted by

ISCLT for cooling tower source "A" was located at coordinate 900, -700. Annual constituent

concentration values at the maximum location ranged between a low of 9.06 x 10"3 jtg/m3

for vinyl chloride to 9.48 x 10"1 j*g/m3 for tetrachloroethene. The maximum annual average

ground-level concentration predicted by ISCLT for cooling tower "B" was located at

coordinate 900, -700. Annual constituent concentration values at the maximum location

ranged from a low of 7.94 x 10"3 >ig/m3 for vinyl chloride to 8.62 x 10"1 /xg/m3 for

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tetrachloroethene. In computing the reported maximum average ambient concentration

values, the source mass emission rate was assumed to be split equally between cooling

towers "A" and "B".

The maximum annual average off-site ground-level concentrations predicted by

ISCLT for the water clarifier and cooling tower sources was located at perimeter coordinate

P9 (211.2, -1134.5). Annual ground-level ambient constituent concentration values for the

water clarifier at the maximum location ranged between a low of 3.73 x 10"3 /zg/m3 for

1,1,2,2-tetrachloroethane to 3.38 x 10"2 /*g/m3 for tetrachloroethene. The maximum annual

average off-site ground-level concentration predicted by ISCLT for cooling tower source "A"

at the maximum location ranged between a low of 5.75 x 10^ [ig/m3 for vinyl chloride to

6.24 x 10"2 /ig/m3 f°r tetrachloroethene. The maximum annual average off-site ground-level

concentration predicted by ISCLT for cooling tower "B" at the maximum location ranged

from a low of 4.34 x 10"* /ig/m3 for vinyl chloride to 4.71 x 10~2 /xg/m3 for tetrachloroethene.

In computing the reported maximum average ambient concentration values, the source mass

emission rate was assumed to be split equally between cooling towers "A" and "B".

Table 15 summarizes the combination of the individual source contributions to the

total Water Reclamation Facility impact on ambient air quality both onsite and at the plant

perimeter. The point of maximum concentration onsite is specified at coordinates 900, -700

and represents the combined maximum ambient concentration from each source

individually. The point of maximum impact at the plant perimeter is located at coordinates

211.2, -1134.5.

5.3 RISK EVALUATION

Risk estimates were calculated based on data provided from ISCLT modeling.

Exposure to a site worker and adult resident was assessed. Assumptions for the site worker

include: (1) body mass of 70 kg, (2) inhalation rate of 2.5 m3/hour, (3) exposure duration

of 8 hours/day, and (4) exposure frequency of 250 days per year for 25 years. Assumptions

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for the resident include: (1) body mass of 70 kg, (2) inhalation rate of 0.83 m3/hour, (3)

exposure duration of 17 hours per day, and (4) exposure frequency of 350 days per year for

30 years. According to current guidance, exposure estimates for vinyl chloride are doubled

to account for greater sensitivity during early childhood. Exposure estimates for residents

to vinyl chloride were calculated according to the above assumptions and doubled. All of

the exposure assumptions (site worker and resident) were based on current standard

assumptions (USEPA, 1991a) with the exception of the 17 hours daily exposure duration for

the resident. The exposure duration was based on guidance (Table 5-9) from USEPA's

Exposure Factors Handbook (1989).

Toxicity values (cancer slope factors and reference doses) were obtained from the

Integrated Risk Information System (IRIS), Health Effects Assessment Summary Tables

(HEAST) (USEPA, 1991), and Agency for Toxic Substances and Disease Registry Toxicity

Profiles (ATSDR, 1990). Inhalation values were used if available. Oral toxicity values were

used only for bromodichloromethane because inhalation data were not sufficient to develop

toxicity values. All slope factors were obtained from IRIS or HEAST. Because relatively

few inhalation reference doses (RfDs) have been developed, most of the RfDs were derived

from minimal risk levels (MRLs) reported in the ATSDR documents. In most cases chronic

MRLs were not available; therefore, subchronic MRLs (called intermediate MRLs in the

ATSDR documents) were divided by an uncertainty factor of 10 to derive a chronic MRL.

Sources for all toxicity values are indicated on Tables 16 and 17. Complete references are

provided in Section 7.0.

Cancer risk estimates were 6 x 10"7 (resident) and 7 x 10"6 (worker) (Table 16). These

values fall within the potentially acceptable range of 1 x 10^ to 1 x 10"6. Typically, an excess

lifetime cancer risk of 1 x 10"6 is often used as the criterion for residential exposure and 1

x 10"5 is used for worker exposure. The hazard index was 0.02 (resident) and 0.6 (worker)

and are considered acceptable because they are below 1 (Table 17).

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This same air contamination source was modeled and risk calculations completed in

1989 (Geraghty & Miller, January 1990). The 1989 modeling included the assumption that

the contaminant source, the ground-water production wells, were active only six months

during the year. The concentration of contaminants entering the Water Reclamation

Facility in the 1989 modeling study were based on one sampling episode and a flow rate of

12,000 gpm. In addition, the wells were not sampled during a sampling episode, only the

points in and out of the Water Reclamation Facility. The concentrations of contaminants,

specifically tetrachloroethene, was significantly higher in 1989. However, because the flow

volume was less in 1989, 12,000 gpm, the mass per day values are not significantly different.

The current study was conducted for two reasons: because regulator monitoring of

the production wells suggested that the concentration of contaminants had increased

significantly since 1989, and because Alcoa was operating production well PW-6 year round

to maintain capture of a contamination plume. Although the pounds per day amounts in

1991 are less than 1989, the total mass per year is higher assuming year round source.

As outlined on Table 18, the 1991 study resulted in higher total cancer risks and

hazard index. These values, however, are still within an acceptable range.

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6.0 PRINCIPLE FINDINGS

The ISCLT model has been employed to predict receptor concentrations on an

annual basis for all compounds of concern emitted at the Water Reclamation Facility. This

analysis was accomplished utilizing actual facility operating parameters, measured water

concentrations, refined air quality dispersion modeling techniques, and site-specific

meteorology. Results of this modeling were used to evaluate risk to Alcoa employees and

area residents. A mass balance of VOC contaminants in the Mill Water System and Water

Reclamation Facility was also conducted. The principle findings are outlined below.

• Ambient concentration values predicted using conservative assumptions and through

the use of ISCLT modeling have been used in performing a risk evaluation of the

impact of air emission from the Water Reclamation Facility operation on worker

safety and public health. The facility as currently operated appears to pose

acceptable risk to public health and worker safety.

• Although this air modeling and risk evaluation conservatively assumed the total mass

of contaminants at the Water Reclamation Facility are emitted to the air year round,

the sampling data and a mass balance evaluation suggest significant air emissions

would occur only when the cooling towers are operational. Due to seasonal

variations in water temperature, the cooling towers are operational only during the

warmer months.

• Sampling data reveals that even when the cooling towers are active, a small

percentage of the VOC mass will leave the Water Reclamation Facility in the

aqueous phase. This aqueous phase contaminant mass can reach the NPDES

discharge points in one of two ways: (1) as overflow from the Water Reclamation

Facility directly to Outfall 004, or (2) after being recycled into the Mill Water System

and used as cooling or process water in the ingot plant and/or hot rolling mill

operations, the water is discharged directly to Outfall 006.

15

GERAGHTY & MILLER, INC.

• The mass balance evaluation suggest that when the cooling towers are inactive, a

high percentage of the contaminant mass will be recycled into the Mill Water System.

IIIIIIIIIIIIIIIIIII GERAGHTY & MILLER, INC.

I• 7.0 REFERENCES

Agency for Toxic Substances and Disease Registry (ATSDR), 1990. Draft Health

• Assessment Guidance Manual, U.S. Department of Health and Human Services,

Atlanta, Georgia.

Geraghty & Miller, Inc. Air Quality Group, 1990a. Source Impact Evaluation ISCLT

I Dispersion Modeling for the Water Reclamation Facility at the Alcoa - Davenport,

Iowa Works Plant. Unpublished consultant's report prepared for the Aluminum

• Company of America.

I Geraghty & Miller, Inc., 1990b. Final Ground-Water Assessment for the Alcoa - Davenport

Waste Site. Unpublished consultants report prepared for the Aluminum Company

I of America.

I Integrated Risk Information System (IRIS), 1991. U.S. Environmental Protection Agency,

Office of Health and Environmental Assessment, Cincinnati, OH.

IU.S. Environmental Protection Agency (USEPA), 1991a. Human Health Evaluation

| Manual, Supplemental Guidance: "Standard Default Exposure Factors". Office of

Solid Waste and Emergency Response, Washington, DC.

— U.S. Environmental Protection Agency (USEPA), 1991b. Health Effects Assessment

• Summary Tables, FY-1991 Annual. Office of Emergency and Remedial Response,

_ Washington, DC.

• U.S. Environmental Protection Agency (USEPA), 1989. Exposure Factors Handbook, Office

• of Health and Environmental Assessment, Washington, DC.

I

I

• GERAGHTY # MILLER, INC.

GERAGHTY& MILLER, INC.

Environmental Services

DRAWING CONFIDENTIAL THS DRAWINGAND ALL HFORMATION CONTAINED THEREON ISAND SHALL REMAIN THE PROPERTY OT CEftACKTY

* MILLER. WC. AS AH INSTRUMENT Of PROFES-SIONAL SERVICE. THIS INFORMATION SHALL NOT

BE USED M WHOLE Oft IN PART WITHOUT THE

FULL KNOWLEDGE AND PRIOR WRITTEN CONSENTOf CERACHTY * WU.ER. INC

SCALE VERIFICATION

IMS BAR REPRESENTSONE INCH ON THEORIGINAL DRAWING:

USE TO VCRtfY FIGUREREPRODUCTION SCALE

PCOJCCT NO.: OHO 1141

OKATTED 91: tMJ

CKCCXCO BT: TA

FU NO: UTUTT

DAIt lOHOVIt

DATE: 21NOV11

DATE: IINOVft

WATER RECLAMATION FACILITY SITE MAP FIGURE

ALCOA ALUMINUM COMPANY OF AMERICADAVENPORT WORKS

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

J^GERAGHTYW& MILLER, INC.^Br E n v i r o n m e n l a l S e r v i c e s

MississippiRiver Water

Supply

fllcoaGround-WaterSupply Well

#6

Notsampled

370 GPM

Mill WaterTreatment

NPDES Outfall#6

fllcoaGround-WaterSupply Well

SampleNo. S-3

320 GPM SampleNo. S-4

Plant OperationsCooling and Process

(Hot Mill, ColdMill, Plate Mill)

Foil MillOperationsfor Cooling

Lift Stations001, 002, 003,

004, 005

15,300 GPM

Lift Station 003

SampleNo. S-7

fllcoaGround-WaterSupply Well

#1

0 GPM

Not In operation at timeof sampling

Recycled toPlant CoolingWater System

Water Reclame Ion Facility

WaterClarlfler

SampleNo. S-11

Cool IngTouers

12,300 GPM

Bloudou

3000 GP

SampleNo. S-12

T and Overflou NPOES Outfall

1 SampleNo. S-13

Figure 2. M i l l Water and Water Reclamation FacilityFlow Diagram and Sampling Locations

IIII

IIIIIIIIIIIIII

Figure 3. Average Total VOC Mass Balance Flow DiagramM i l l Water and Water Reclamation Facility

MississippiRiver later

Supply

RlcoaGround" WaterSupply Well

#6

Notsampled

370 6PM

Mill WaterTreatment

RlcoaGround-WaterSupply Well

#5

10-60 lb/day

3868 Ib/year

320 GPM

NPDES Outfall#6

Plant OpeCooling ar

(Hot MlMill, Pit

•rationsid Process1, Coldite Mill)

RlcoaGround-WaterSupply Well

#1

32-47 Ib/day

5926 Ib/year

0 GPM 0 lb/day

Not In operation at timeof sampling

43-07 lb/day PW-5 RCTIVE

10-6 lb/day PW-5 INRCTIVE

9795 Ib/year

Foil MillOperat ionsfor Cooling

Lift Stations001, 002, 003,

004, 005

15,300 GPM

Lift Station 003

48-08 Ib/day PW-5 ACTIVE15-75 lb/day PW-riNACTIVE11,620 Ib/year

Water Reclamation Facility

Recycled toPlant CoolingWater System

WaterClarifler

48-71 lb/day PW

18-08 lb/day PW

12,180 Ib/year

CoolingTouers

12,300 GPM

Bloudour

5 RCTIVE

5 INACTIVE

3000 GPMi end Overfloui

3-72 lb/day PW-5 flCT^3-54 lb/day PW-5 INflC

! 1325-95 IbA

2-61 lb/day COOLING TOWERRCTIVE !18-07 Ib/day COOLING

-TOWER-INRCTIVE-1

3129 Ib/year

NPDES Outfall#004

GERAGHTY & MILLER, INC.

IIIIIIIIIIIIIIIIIII

^GERAGHTY? MILLER, INC.

E n v i r o n m e n t a l Services

Figure 5

-500

-1000

-1500-500

General Isoplethsand Facility Perimeter ReceptorsAlcoa Davenport WorksDavenport, Iowa 1991

500 1000 1500 2000 2500500

- 0

- -500

- -1000

-1500500 1000 1500

SCALE 1:600 m

2000 2500

Note: ISCLT Predicted Maximum Annual Average Ambient

Concentration Isopleths for Combined Sources

in micrograms per cubic meter (ug/m3)

assuming a 1 g/s mass emission rate

SURFER File: olc91.plt

II

Figure 4 N

3.0 7.0 12.0 18.0 I

24.0

WIND SPEED CLASS BOUNDARIES(MILES/HOUR)

NOTES:

DIAGRAM OF THE FREQUENCY OF

OCCURRENCE FOR EACH WIND DIRECTION.

WIND DIRECTION IS THE DIRECTION

FROM WHICH THE WIND IS BLOWING.

EXAMPLE - WIND IS BLOWING FROM THE

NORTH 4.8 PERCENT OF THE TIME.

WINDROSESTATION NO. 14923Moline, IllinoisPERIOD: 1988

SUMMARY TABLEWIMOROSE DATA

Station No. 14923Moline, Illinois .Period: 1988

Wind-s Classestf I I *iW % • VI •

.022.545.067.590.0112.5135.0157.5180.0202.5225.0247.5270.0292.5315.0337.5

TOTAL

.00524

.00191

.00270

.00752

.02071

.01496

.00386

.00630

.01573

.00607

.00850

.01626

.00632

.00489

.00080

.00191

.12368

.01275

.00569

.00763

.01651

.03324

.02084

.00535

.01105

.02869

.01196

.01423

.02903

.01423

.01469

.00478

.00467

.23535

.01753 .01173

.00535 i .00262

.00695 ! .00558

.01879 .01025

.01753 i .01070

.01765

.01093

.01196

.04394

.02061

.01013

.00888

.00911

.03996

.02186.01662 I .01446.02562.02391.03336.01526.00956

.29557

.02049

.02914

.04531

.01594

.01070

.26686

.00034

.00000

.00046

.00080

.00091

.00046

.00159

.00205

.00660

.00262

.00194

.00695

.01104

.01810

.00444

.00194

.06023

.00000

.00000

.00000

.00000

.00023

.00046

.00011

.00000

.00148

.00023

.00011

.00342

.00535

.00558

.00103

.00046

.01845

AM\

.04759

.01558

.02331

.05386

.08333

.06449

.03073

.04046

.13641

.06334

.05586

.10176

.09000

.12193

.04224

.02924

1.00015

WGf&i'fnvir

GERAGHTY& MILLER, INC.

Environmental Services

TABLE 1. SUMMARY TABLE OF ANALYTICAL RESULTS FROM W A T E RQUALITY SAMPLING, MILL WATER SYSTEM AND WATER RECLAMATION FACILITY

PUMPING SEASON FOR WELL #5 IS MAY THROUGH OCTOBER

PARAMETER

Tetrachloroethene1,2-Dlchloroethene(Total)TrichloroetheneVinyl chloride

TOTAL VOCS

LOCATION WELL #5 WELL #5 WELL #5 WELL #5 WELL #5DESIGNATION S-4 S-4 S-4 S-4 S-4DATE 7/11/91 7/17/91 7/24/91 8/1/91 8/8/91UNITS (ug/L) (ug/L) (ug/L) (ug/L) (ug/L)

3700 5800 6200 5500 54001800 2200 2100 2200 2100

650 870 940 970 9100 230 230 0 340

6150 9100 9470 8670 8750

A V E R A G E MAXIMUM(ug/L) (ug/L)

5320 62002080 2200

868 970160 340

8428 9470

MASSBASED ON 320 GPM

AVERAGE MAXIMUM(LB/DAY) (LB/DAY)

20.50 23.898.01 8.483.34 3.740.62 1.31

32.47 36.49

WELL #6 IS PUMPING YEAR ROUND

PARAMETER

Tetrachloroethene1,2-Dlchloroethene(Total)TrichloroetheneVinyl chlorideChloroformBromodlchloro methane

TOTAL VOCS

LOCATION WELL #6 WELL #6 . WELL #6 WELL #6 WELL #6DESIGNATION S-3 S-3 S-3 S-3 S-3DATE 7/11/91 7/17/91 7/24/91 8/1/91 8/8/91UNITS (ug/L) (ug/L) (ug/L) (ug/L) (ug/L)

1500 1200 1300 940 750860 680 880 700 440600 470 550 420 180150 0 160 0 13

0 0 30 37 00 0 4 0 31

3110 2350 2924 2097 1414

AVERAGE MAXIMUM(ug/L) (ug/L)

1138 1500712 880444 600

64.6 16013.4 37

7 31

2379 3110

MASSBASED ON 370 GPM

AVERAGE MAXIMUM(LB/DAY) (LB/DAY)

5.07 6.683.17 3.921.98 2.670.29 0.710.06 0.160.03 0.14

10.60 13.86

PARAMETER

Tetrachloroethene1,2-Dlchloroethene(Total)TrichloroetheneVinyl chlorideChloroformBromodlchloro methaneOTHER

TOTAL VOCS

LOCATION TO CLARIFIER TO CLARIFIER TO CLARIFIER TO CLARIFIER TO CLARIFIERDESIGNATION S-7 S-7 S-7 S-7 S-7DATE 7/11/91 7/17/91 7/24/91 8/1/91 8/8/91UNITS (ug/L) (ug/L) (ug/L) (ug/L) (ug/L)

140 120 96 ' 160 9873 56 62 68 6638 30 29 32 310 0 0 7 6

58 36 30 37 136 0 4 0 06 0 0 3 0

321 242 221 307 214

AVERAGE MAXIMUM(ug/L) (ug/L)

122.8 16065 7332 38

2.6 734.8 58

2 6: 1.8 6

261 321

MASSBASED ON 15,300 GPMAVERAGE MAXIMUM(LB/DAY) (LB/DAY)

22.62 29.4811.97 13.455.90 7.000.48 1.296.41 10.690.37 1.110.33 1.11

48.08 59.14

GERAGHTY & MILLER, INC.

TABLE 1 (CONTINUED)SUMMARY TABLE OF ANALYTICAL RESULTS FROM WATERQUALITY SAMPLING, MILL WATER SYSTEM/WATER RECLAMATION FACILITY

PARAMETER

Tetrachloroethene1,2-Dlchloroethene(Total)TrlchloroetheneVinyl chlorideChloroformBromodlchloro methaneOTHER

TOTAL VOCS

LOCATION TO COOLING TO COOLING TO COOLING TO COOLING TO COOLINGDESIGNATION T O W E R S - 1 1 T O W E R S - 1 1 T O W E R S - 1 1 T O W E R S - 1 1 T O W E R S - 1 1DATE 7/11/91 7/17/91 7/24/91 8/1/91 8/8/91UNITS (ug/L) (ug/L) (ug/L) (ug/L) (ug/L)

120 140 120 93 8578 67 66 65 7134 33 31 30 280 0 0 0 5

70 49 39 52 186 6 0 4 03 3 0 3 3

311 298 256 247 210

AVERAG MAXIMUM(ug/L (ug/L)

111.6 14069.4 7831.2 34

1 545.6 70

3.2 62.4 3

264.4 311

MASSBASED ON 15,300 GPMAVERAGE MAXIMUM

(LB/DAY) (LB/DAY)

20.56 25.7912.79 14.37

5.75 6.260.18 0.928.40 12.900.59 1.110.44 ' 0.55

48.71 57.29

PARAMETER

Tetrachloroethene1 ,2 - Dichloroethene(Total)TrlchloroetheneVinyl chlorideChloroformBromodlchloro methaneOTHER

TOTAL VOCS

LOCATION LEAVE COOL LEAVE COOL LEAVE COOL LEAVE COOL LEAVE COOL

DATE 7/11/91 7/17/91 7/24/91 8/1/91 8/8/91UNITS (ug/L) (ug/L) (ug/L) (ug/L) (ug/L)

7 4 0 4 07 0 0 3 - 00 0 0 0 00 0 0 0 . 0

40 19 0 4 00 0 0 0 00 0 0 0 0

54 23 0 11 0

AVERAG MAXIMUM(ug/L (ug/L)

3 72 70 00 0

12.6 400 00 0

17.6 54

MASSBASED ON 12,300 GPMAVERAG MAXIMUM

(LB/DAY) (LB/DAY)

0.44 1.040.30 1.040.00 0.000.00 0.001.87 5.920.00 0.000.00 0.00

2.61 8.00

PARAMETER

Tetrachloroethene1,2-Dlchloroethene(Total)TrlchloroetheneVinyl chlorideChloroformBromodlchloro methaneOTHER

TOTAL VOCS

LOCATION OVERFLOWDESIGNATION S-13DATE 7/17/91UNITS (ug/L)

36261 1

030

00

103

MASS BASEDON 3000 GPM

(LB/DAY]

1.300.940.400.001.080.000.00

3.72

GERAGHTY & MILLER, INC.

TABLE 2. SUMMARY TABLE OF VOC MASS PER YEAR CALCULATIONS

WELL #5

PARANETER

Tetrachloroethene1 ,2-Dichloroethene(TotaOTrichloroetheneVinyl chloride

TOTAL VOCS

MASS PER DAYBASED ON 320 GPM

AVERAGE MAXIMUM(IB/DAY) (LB/DAY)

20.50 23.898.01 8.483.34 3.740.62 1.31

32.47 36.49

MASS PER YEARACTIVE MAY -OCTOBER

AVERAGE MAXIMUM(LB/YEAR) (LB/YEAR)

3740.98 4359.781462.64 1547.02610.37 682.10112.51 239.08

5926.49 6659.22

PERCJENT UJNTHIDUIIUN TO MILL WATERBASED ON MASS PER DAY VALUES INTO CLARIFIER

AVERAGE MAXIMUM(LB/YEAR) (LB/YEAR)

90.61%66.93%56.73%

128.71%

67.54%

81.05%63.03%53.39%

101.59%

61.70%

WELL #6

PARAJVETER

Tetrachloroethene1 ,2-Dichloroethene(Total)TrichloroetheneVinyl chlorideChloroformBromodchloromethane

TOTAL VOCS

MASSBASED ON 370 GPM

AVERAGE MAXIMUM(LB/DAY) (LB/DAY)

5.07 6.683.17 3.921.98 2.670.29 0.710.06 0.160.03 0.14

10.60 13.86

MASS PER YEARACTIVE YEAR ROUNDAVERAGE MAXIMUM(IB/YEAR) (LB/YEAR)

1850.53 2439.191157.80 1430.99722.00 975.68105.05 260.1821.79 60.1711.38 50.41

3868.56 5057.26

MAbbl-HUM UUMbNED SUUHUEbWELL #5 + WELL #6

AVERAGE(LB/DAY)

43.07

MAXIMUM(LB/DAY)

50.34

AVERAGE(LB/YEAR)

9795.05

MAXIMUM(IB/YEAR)

11716.48

INTO CLARIFIER

PARANETER

Telrachloroethene1 ,2-Dichloroe1hene(Total)TrichloroetheneVinyl chlorideChloroformBromodichloromethaneOTHER

TOTAL VOCS

MASS BASED ON 15,300 GPM\AO-L #5 ACTIVE

AVERAGE MAXIMUM(LB/DAY) (LB/DAY)

22.62 29.4811.97 13.455.90 7.000.48 1.296.41 10.690.37 1.110.33 1.11

48.08 59.14

ESTIMATED MASS WfTHWELL #5 INACTIVE

AVERAGE MAXIMUM(LB/DAY) (LB/DAY)

2.12 5.593.96 4.972.55 3.260.00 0.006.41 10.690.37 1.110.33 1.11

15.75 26.72

MASS PER YEAH WlPHWELL #5 SOURCE ONLY HALF YEARAVERAGE(LB/YEAR)

4516.422908.131541.39

62.322340.04134.49121.04

11623.83

MAXIMUM(LB/YEAR)

6399.043361.691873.12231.61

3900.07403.46403.46

16572.45

GERAGHTY & MILLER, INC.

TABLE 2. SUMMARY TABLE OF VOC MASS PER YEAR CALCULATIONS (Continue^

TO COOLJNG TOWER

PARAMETER

Tetrachloroethene1 ,2-Dfchloroethene(Total)TrichloroetheneVinyl chlorideChloroformBromodchloromethaneOTHER

TOTAL VOCS

MASS BASED ON 15,300 GPMV\ELL #5 ACTIVE

AVERAGE MAXIMUM(LB/DAY) OB/DAY)

20.56 25.7912.79 14.375.75 6.260.18 0.928.40 12.900.59 1.110.44 0.55

48.71 57.29

ESTIMAltD MASS WITHWELL #5 INACTIVEAVERAGE MAXIMUM(LB/DAY) (LB/DAY)

1.93 4.894.23 5.312.49 2.920.00 0.008.40 12.900.59 1.110.44 0.55

18.08 27.67

MASSHL-HYbAHWIIHWELL #5 SOURCE ONLY HALF YEARAVERAGE MAXIMUM(IB/YEAR) (LB/YEAR)

4104.57 5599.163106.13 3591.941503.42 1675.95

23.42 165.233066.00 4706.98215.35 403.46160.60 201.73

12179.43 16344.46

LEAVING COOLING I OWhH

PARAMETER

Tetrachloroethene1 ,2-Dichloroethene(Tbtal)TrichloroetheneVinyl chlorideChloroformBromodchloromethaneOTHER

TOTAL VOCS

MASS BASED ON 12,300 GPMWELL # 5 AND TOWER ACTIVE

AVERAGE MAXIMUM(LB/DAY) (LB/DAY)

0.44 1.040.30 1.040.00 0.000.00 0.001.87 5.920.00 0.000.00 0.00

2.61 8.00

ESTIMAI bD MASS, WELL #5AND TOWER INACTIVEAVERAGE MAXIMUM(LB/DAY) (IB/DAY)

1.55 3.933.40 4.272.00 2.350.00 0.006.75 10.370.47 0.890.35 0.44

14.53 22.25

MASSHhHYkAHWIIHWELL #5 SOURCE ONLY HALF YEARAVERAGE MAXIMUM(LB/YEAR) (LB/YEAR)

363.57 907.04675.34 969.19365.02 428.35

0.00 0.001573.69 2972.42

86.56 162.1764.55 81.09

3128.74 5520.26

OVERFLOW

PARAMETER

Tetrachloroethene1 ,2-Dichloroethene(TotaDTrichloroetheneVinyl chlorideChloroformBromodchloromethaneOTHER

TOTAL VOCS

MASS BASED ON 3000 GPMWELL #5 ACTIVE

(LB/DAY)

1.300.940.400.001.080.000.00

3.72

ESTIMAIhUMASSWmHWELL #5 INACTIVE

(LB/DAY)

0.380.830.490.001.650.120.09

3.54

MASSPhHYbAHWIIHWELL #5 SOURCE ONLY HALF YEAR

(LB/YEAR)

306.42322.77161.54

0.00498.36

21.1115.75

1325.95GERAGHTY & MILLER, INC.

IIIIIIIIIIIIIIIIIII

TABLE 3. MASS BALANCE ANALYSIS OF CONTAMINANTS IN THE MILL WATER AND

WATER RECLAMATION FACILITY, TWO SCENERIOS.

SCENERIO #1 BOTH PRODUCTION WELL #5 AND COOLING TOWERS ACTIVE

MASS FROM COMBINED SOURCE OF PW-5 AND PW-6

FLOW COMBINED WITH MILL WATER BEFORE ENTERING

THE WATER CLARIFIER. MASS OF CONTAMINANTS INCREASES

DUE TO WATER TREATMENT RELATED CHEMICALS IN MILL WATER.

INTO THE WATER CLARIFIER

WITHIN THE CLARIFIER THERE APPEARS TO BE A SLIGHT INCREASE

IN THE WATER TREATMENT COMPOUNDS. THIS OVERSHADOWS

A DECREASE IN THE VOCS FROM THE PRODUCTION WELL SOURCE

INTO COOLING TOWERS

ADD

FLOW MASS

(GPM) (LBS/DAY)

690 43.07

1461O 5.01

15300

0

48.08

0.83

SIGNIFICANT LOSS OF CONTAMINANTS TO THE AIR

DUE TO VOLATILIZATION WITHIN THE COOLING TOWERS

OVERFLOW FROM WATER RECLAMATION

RECYCLED INTO MILL WATER SYSTEM

SUBTRACT 0

SUB TOTAL 1530O

3OOO

12300

-42.38

8.33

3.72

2.81

SCENERIO #2 BOTH PRODUCTION WELL *5 AND COOLING TOWERS INACTIVE

MASS FROM PRODUCTION WELL #B ONLY

FLOW COMBINED WITH MILL WATER BEFORE ENTERING

THE WATER CLARIFIER. MASS OF CONTAMINANTS INCREASES

DUE TO WATER TREATMENT RELATED CHEMICALS IN MILL WATER

INTO THE WATER CLARIFIER

WITHIN THE CLARIFIER THERE APPEARS TO BE A SLIGHT INCREASE

IN THE WATER TREATMENT COMPOUNDS. THIS OVERSHADOWS

A DECREASE IN THE VOCS FROM THE PRODUCTION WELL SOURCE,

WHICH IS SIGNIFICANTLY LESS OF A SOURCE WITH PW-6 INACTIVE.

BY-PASSING COOLING TOWERS

OVERFLOW FROM WATER RECLAMATION

RECYCLED INTO MILL WATER SYSTEM

FLOW MASS

(GPM) (LBS/DAY)

370 10.8

ADD

ADD

SUB TOTAL

14930

163OO

0

5.14

15.74

2.33

1S300 18.07

3000 3.54

1230O 14.53

GERAGHTY & MILLER, INC.

Table 4. Volatile Organic Compound Analytical Data for Sample Point S7Aluminum Company of AmericaDavenport, Iowa

S7 S7 S7 S7-RE S7 S7 Maximum Average(7/11/91) (7/17/91) (7/24/91) (7/24/91) (8/1/91) (8/8/91) S7 S7

Compound fue/11 Cug/11 • (/ug/n fug/11 (wg/1) (fig/h T/ug/ll fwg/1}

AcroleinAcrylonitrileBenzeneBromodichloromethaneBromoformBromomethaneCarbon TetrachlorideChlorobenzeneChloroethane2 — Chloroethylvinyl etherChloroformChloromethaneDibromochloromethane1 ,2 — Dichlorobenzene1 ,3 — Dichlorobenzene1,4 — Dichlorobenzene1,1 — Dichloroethane1 ,2 - Dichloroethane1,1 — Dichloroethene1,2-Dichloroethene (total)1 ,2 — Dichloropropanecis — 1 ,3 — Dichloropropenetrans — 1,3 — DichloropropeneEthylbenzeneMethylene chloride1 ,1,2,2 — TetrachloroethaneTetrachloroetheneToluene1,1,1 — Trichloroethane1,1,2— TrichloroethaneTrichloroetheneTrichlorofluoromethaneVinyl chloride

0006000000

5800000000

73000006

140000

3800

0000000000

3600000000

56000000

120400

3000

0000000000

2600000000

60000000

110000

2600

0004000000

3000000000

62000000

96000

2900

0000000000

3700000000

68000000

160000

3207

0000000000

1300000000

66000000

98000

3106

0006000000

5800000000

73000006

160400

3807

000

1.7000000

33.300000000

64.200000

1.0120.7

0.700

31.00

2.2

0 Value inserted for compound not detected in sample.

OH01302MSCLTDAT.WK3 03-Mar-92

GERAGHTY & MILLER, INC.

Table 5. Volatile Organic Compound Analytical Data for Sample Point SllAluminum Company of AmericaDavenport, Iowa

Sll Sll Sll Sll Sll Maximum Average(7/11/91) (7/17/91) (7/24/91) (8/1/91) (8/8/91) Sll Sll

Compound (ug/l) (jug/ll fwg/11 (jug/I) fug/ll fug/H (jj.g/1)

AcroleinAcrylonitrileBenzeneBromodichloromethaneBromoformBromomethaneCarbon TetrachlorideChlorobenzeneChloroethane2 — Chloroethylvinyl etherChloroformChloromethaneDibromochloromethane1,2 — Dichlorobenzene1 ,3 — Dichlorobenzene1,4 — Dichlorobenzene1,1 — Dichloroethane1,2 — Dichloroethane1,1 — Dichloroethene1,2 — Dichloroethene (total)1 ,2 — Dichloropropanecis — 1 ,3 — Dichloropropenetrans — 1,3 — DichloropropeneEthylbenzeneMethylene chloride1 ,1 ,2,2 - TetrachloroethaneTetrachloroetheneToluene1,1,1 — Trichloroethane1 ,1,2 — TrichloroethaneTrichloroetheneTrichlorofluoromethaneVinyl chloride

0006000000

7000000300

78000000

120000

3400

0000000000

4900000000

67000000

140500

3300

0 -000000000

39000000.00

66000000

120000

3100

0004000000

5200000300

65000000

93000

3000

0000000000

1800000300

71000000

85400

2805

0006000000

7000000300

78000000

140500

3405

000

2.0000000

45.600000

1.800

69.4000000

111.61.8

00

31.20

1.0

0 Value inserted for compound not detected in sample.

OH01302MSCLTDAT.WK3 06:14 PM 03-Mar-92

GERAGHTY & MILLER, INC.

Table 6. Volatile Organic Compound Analytical Data for Sample Point S12 and S13Aluminum Company of AmericaDavenport, Iowa

Compound

AcroleinAcrylonitrileBenzeneBromodichloromethaneBromoformBromomethaneCarbon TetrachlorideChlorobenzeneChloroethane2 — Chloroethylvinyl etherChloroformChloromethaneDibromochloromethane1,2 — Dichlorobenzene1,3 — Dichlorobenzene1 ,4 — Dichlorobenzene1,1 — Dichloroethane1 ,2 — Dichloroethane1,1 — Dichloroethene1,2-Dichloroethene (total)1 ,2 — Dichloropropanecis — 1,3 — Dichloropropenetrans — 1,3 — DichloropropeneEthylbenzeneMethyiene chloride1 ,1 ,2,2 - TetrachloroethaneTetrachloroetheneToluene1,1,1 — Trichloroethane1 ,1 ,2 — TrichloroethaneTrichloroetheneTrichlorofluoromethaneVinyl chloride

S12(7/11/91)

<>g/n

0000000000

400000000070000007000000

S12(7/17/91)

fug/n

0000000000

190000000000000004000000

S12(7/24/91)

Oie/11

000000000000000000000000000000000

S12-A(8/1/91)o*e/n

000000000040000000030000004000000

S12(8/8/91)f^g/n

000000000000000000000000000000000

MaximumS12

(«e/n

0000000000

400000000070000007000000

AverageS12

r«g/n

0000000000

12.600000000

2.0000000

3.0000000

0 Value inserted for compound not detected in sample.

OH01302MSCLTDAT.WK3 06:14 PM 03-Mar-92

GERAGHTY & MILLER, INC.

Table 7. Volatile Organic Compound Analytical Data for Field BlanksAluminum Company of AmericaDavenport, Iowa

Compound

AcroleinAcrylonitrileBenzeneBromodichloromethaneBromoformBromomethaneCarbon TetrachlorideChlorobenzeneChloroethane2 — Chloroethylvinyl etherChloroformChloromethaneDibromochloromethane1 ,2 — Dichlorobenzene1,3 — Dichlorobenzene1,4— Dichlorobenzene1,1 — Dichloroethane1 ,2 — Dichloroethane1,1 — Dichloroethene1,2 — Dichloroethene (total)1 ,2 — Dichloropropanecis — 1 ,3 — Dichloropropenetrans — 1,3 — DichloropropeneEthylbenzeneMethjdene chloride1 ,1 ,2,2 — TetrachloroethaneTetrachloroet heneToluene1,1,1 — Trichloroethane1 , 1 ,2 — TrichloroethaneTrichloroetheneTrichlorofluoromethaneVinyl chloride

TRIP0717(7/17/91)

fue/n

000000000000000000000000000000000

STB-1(7/24/91)

fue/1)

000000000000000000000000000000000

BDW(7/31/91)

fw.e/11

000000000000000000000000000000000

Trip Blank(8/1/91)

fwe/1)

000000000000000000000000000000000

STB -3(8/8/91)

fMe/n

000000000000000000000000000000000

MaximumBlank(ME/11

000000000000000000000000000000000

AverageBlankfw.e/1)

000000000000000000000000000000000

0 Value inserted for compound not detected in sample.

OH01302MSCLTDAT.WK3 06:14 PM 03-Mar-92

GERAGHTY & MILLER, INC.

VolatileOrganic Compound Analytical Data — Summary of Maximum ValuesAluminum Company of AmericaDavenport, Iowa

Clarifier SourceMaximum Maximum Maximum

S7 Sll S7-S11Compound fug/I) (wg/11 fu.g/11

AcroleinAcrylonitrileBenzeneBromodichloromethaneBromoformBromomethaneCarbon TetrachlorideChlorobenzeneChloroethane2 — Chloroethylvinyl etherChloroformChloromethaneDibromochloromethane1,2 — Dichlorobenzene1,3 — Dichlorobenzene1 ,4 — Dichlorobenzene1,1 — Dichloroethane1,2 — Dichloroethane1,1 — Dichloroethene1,2-Dichloroethene (total)1 ,2 — Dichloropropanecis — 1 ,3 — Dichloropropenetrans — 1,3 — DichloropropeneEthylbenzeneMethylene chloride1 ,1 ,2,2 - TetrachloroethaneTetrachloroetheneToluene1,1,1 — Trichloroethane1 ,1 ,2 — TrichloroethaneTrichloroetheneTrichlorofluoromethaneVinyl chloride

0006000000

5800000000

73000006

160400

3807

0006000000

7000000300

78000000

140500

3405

0000000000

-1200000

-300

-5000006

20-1

00402

Cooling Tower SourceMaximum Maximum Maximum

Sll S12 S11-S12Oxe/n f*ig/n fug/ii

0006000000

7000000300

78000000

140500

3405

0000000000

400000000070000007000000

0006000000

3000000300

71000000

133500

3405

0 Value inserted for compound not detected in sample.

OH01302VISCLTDAT.WK3 06:14 PM 03-Mar-92

GERAGHTY & MILLER, INC.

Table 9. Volatile Organic Compound Analytical Data — Summary of Average ValuesAluminum Company of AmericaDavenport, Iowa

Compound

AcroleinAcrylonitrileBenzeneBromodichloromethaneBromoformBromomethaneCarbon TetrachlorideChlorobenzeneChloroethane2 — Chloroethylvinyl etherChloroformChloromethaneDibromochloromethane1 ,2 — Dichlorobenzene1,3— Dichlorobenzene1 ,4 — Dichlorobenzene1,1 — Dichloroethane1,2 — Dichloroethane1,1 — Dichloroethene1,2-Dichloroethene (total)1 ,2 — Dichloropropanecis — 1 ,3 — Dichloropropenetrans — 1,3 — DichloropropeneEthylbenzeneMethylene chloride1 ,1 ,2,2 — TetrachloroethaneTetrachloroetheneToluene1,1,1 -Trichloroethane1 ,1 ,2 — TrichloroethaneTrichloroetheneTrichlorofluoromethaneVinyl chloride

Clarifier SourceAverage Average Average

S7 Sll S7-S11

fwg/U Cue/H (ftg/11

000

1.7000000

33.300000000

64.200000

1.0120.7

0.700

31.00

2.2

000

2.0000000

45.600000

1.800

69.4000000

111.61.8

00

31.20

1.0

000

-0.3000000

-12.300000

-1.800

-5.2000001

9.1-1.1

00

-0.20

1.2

Cooling Tower Source

Average Average AverageSll S12 S11-S12

Jw.e/H (neA) Ou.e/11

000

2.0000000

45.600000

1.800

69.4000000

111.61.8

00

31.20

1.0

0000000000

12.600000000

2.0000000

3.0000000

0002000000

3300000

1.800

67.4000000

108.61.8

00

31.201

0 Value inserted for compound not detected in sample.

OH01302MSCLTDAT.WK3 06:14 PM 03-Mar-92

GERAGHTY & MILLER, INC.

Table 10. Volatile Organic Compound Analytical Data — Summary of Maximum ValuesAluminum Company of AmericaDavenport, Iowa

Clarifier SourceMaximum Average AverageS7-S11 S7-S11 Mass Emission Rate

Compound frig/1) (WJ/1) (g/s)

AcroleinAcrylonitrileBenzeneBromodichloromethaneBromoformBromometbaneCarbon TetrachlorideChlorobenzeneChloroethane2-Chloroethylvinyl etherChloroformChloromethaneDibromochloromethane12-Dichlorobenzene1 ,3 - Dichlorobenzene1,4-Dichloro benzene1,1-Dichloroethane12-Dichloroethane1,1- Dichloroethene12-Dichloroethene (total)12-Dichloropropanecis- 1 ,3 - Dichloropropenetrans- 1 3 - DichloropropeneEthylbenzeneMethyiene chloride1,12,2 -TetracbloroethaneTetrachloroetheneToluene1,1,1 -Trichloroethane1 ,1 ,2 -TrichloroethaneTrichloroetheneTrichlorofluoromethaneVinyl chloride

0000000000

-1200000

-300

-5000006

20-1

00402

000

-0.3000000

-12.300000

-1.800

-5.2000001

9.1-1.1

00

-020

12

000

EEI000000

EEI00000

EEI00

EEI00000

0.0009650.008752

EEI00

EEI0

0.001126

Cooling Tower SourceMaximum Average AverageS11-S12 S11-S12 Mass Emission Rate

Oig/1) (fig/1) (g/s)

0006000000

3000000300

71000000

133500

3405

0002000000

3300000

1.800

67.4000000

108.61.8

00

31201

000

0.001931000000

0.03185400000

0.00173800

0.065060000000

0.1048300.001738

00

0.0301170

0.000965

Water flow rate through the system was assumed to be a constant 15300 Gallons per Minute.EEI Effluent Exceeded Influent0 Value inserted for compound not detected in sample.

OHOI30ZUSCLTDAT.WK3

IIIIIIIIIIIIIIIIIII

TABLE 11. Volatile Organic Compound Analytical DataSummary of Average Mass Emission RatesAluminum Company of AmericaDavenport, Iowa

Clarifier Source Cooling Tower SourceAverage Average

Mass Emission Rate Mass Emission RateCompound (g/s) (g/s)

Bromodichloromethane EEI 0.001931Chloroform EEI 0.0318541,1-Dichloroethane EEI 0.001738U-Dichloroethene (total) EEI 0.0650601,1,2,2-Tetrachloroethane 0.000965 0Tetrachloroethene . 0.008752 0.104830Toluene EEI 0.001738Trichloroethene EEI 0.030117Vinyl chloride 0.001126 0.000965

Water flow rate through the system was assumed to be a constant 15300 Gallons per Minute.EEI Effluent Exceeded Influent0 Value inserted for compound not detected in sample.

OH01302MSCDAT2.WK3 . 06:32 PM 03-Mar-92

GERAGHTY & MILLER, INC.

IIIIIIIIIIIIIIIIIII

Table 12. Summary of ISCLT Dispersion Modeling ResultsAluminum Company of AmericaDavenport, Iowa

Receptor Coordinates(X Coord., Y Coord.)

(meters, meters)

Maximum Individual On -Site

(900, -700)(900,-700)(900,-700)

Perimiter Concentration from

(14.3.-26.9)(1600.1,281.3)(1725.8,-23.5)(1948.7.-23.5)(1948.7.-667.4)(1430.6.-983.6)(564.5, -1265.0)(542.8,-1184.0)(211.2, -1134.5)

(58.2,-402.0)

ReceptorIdentification

Concentrations

Maximum ClarifierMaximum Cooling "A"Maximum Cooling "B"

Combined Sources

P-lP-2P-3P-4P-5P-6P-7P-8P-9P-10

MaximumAnnual Average

Concentration Predicted1 g/s Mass Emission Rate

per SourceC/ig/m3)

53.61362018.77967016.453690

1.4893342.8473664.2817863.2230383.9698974.1175853.7082195.5902565.9545421.760651

Individual Source Contributions to Perimeter Maximum

(21U.-1134.5)(211.2.-1134.5)("211.2,-1134.5)

P-9 - ClarifierP-9 - Cooling "A"P-9 - Cooling "B"

3.8650161.1905800.898946

OH01302\ISCDAT2.WK3 06:32 PM 03-Mar-92

GERAGHTY & MILLER, INC.

Table 13. ISCLT Predicted Maximum On-Site Annual Average Ambient ConcentrationAluminum Company of AmericaDavenport, Iowa

ISCLT PredictedMaximum Annual

Volatile Organic CompoundsArbitrary Concentration (g/sec)Maximum Impact Coordinates (m)

BromodichloromethaneChloroform1,1 -Dichloroethane1,2-Dichloroethene (total)1 ,1 ,2,2 -TetrachloroethaneTetrachloroetheneTolueneTrichloroetheneVinyl chloride

ISCLT Predicted ISCLT PredictedMaximum Annual Maximum Annual

Average Ambient Average Ambient Average AmbientAverage Mass Concentration Average Mass Concentration ConcentrationEmission Rate Clarifier Source Emission Rate Cooling "A" Cooling "B"

fg/sec) (/ig/rn31 (g/sec) O^B/m3) (MS/m3)1

EEIEEIEEIEEI

0.0009650.008752

EEIEEI

0.001126

53.6136(900,-700)

00

. 00

5.18E-024.69E-01

00

6.04E-02

1

0.0019310.0318540.0017380.065060

00.1048300.0017380.0301170.000965

18.7797(900.-700)

1.81E-022.99E-011.63E-026.11E-01

09.84E-011.63E-022.83E-019.06E-03

16.45369(900, -700)

1.59E-022.62E-011.43E-025.35E-01

08.62E-011.43E-022.48E-017.94E-03

OH01302\ISCDAT3.WK3 06:24 PM 03-Mar-92

GERAGHTY & MILLER, INC.

Table 14. ISCLT Predicted Maximum Perimeter Annual Average Ambient ConcentrationAluminum Company of AmericaDavenport, Iowa

Volatile Organic ComooundsArbitrary Concentration (g/sec)Maximum Impact Coordinates (m)

BromodichloromethaneChloroform1,1- Dichloroethane1,2-Dichloroethene (total)1 ,1 ,2,2 - TetrachloroethaneTetrachloroetheneTolueneTrichloroetheneVinyl chloride

Average MassEmission Rate

(g/sec)1

EEIEEIEEIEEI

0.0009650.008752

EEIEEI

0.001126

ISCLT PredictedMaximum AnnualAverage Ambient

ConcentrationClarifier Source

(jig/m3)3.865016

(211.2-1134.5)3.85

0000

3.73E-033.38E-02

00

4.35E-03

Average MassEmission Rate

fg/sec)1

0.0019310.0318540.0017380.065060

00.1048300.0017380.0301170.000965

ISCLT PredictedMaximum AnnualAverage Ambient

ConcentrationCooling "A"

(ju,g/m3)1.19058

(211.2-1134.5)

1.15E-031.90E-021.03E-033.87E-02

06.24E-021.03E-031.79E-025.75E-04

ISCLT PredictedMaximum AnnualAverage Ambient

ConcentrationCooling "B"

fag/m3)0.898946

(211.2-1134.5)

8.68E-041.43E-027.81E-042.92E-02

04.71E-027.81E-041.35E-024.34E-04

OH01302\ISCDAT3.Wk3 06:24 PM 03-Mar-92

GERAGHTY & MILLER, INC.

Table 15. Summary of Maximum Potential Source ImpactAluminum Company of AmericaDavenport, Iowa

Volatile Organic Compounds

ISCLT PredictedMaximum On-Site

Annual AverageCombined Sources

Average Mass Emission Rates(ug/m3')

ISCLT PredictedMaximum Perimeter

Annual AverageCombined Sources

Average Mass Emission Rates

Maximum Impact Coordinates (m)

BromodichloromethaneChloroform1,1-Dichloroethane1,2-Dichloroethene (total)1,1,2,2 -TetrachloroethaneTetrachloroetheneTolueneTrichloroetheneVinyl chloride

(900, -700)

3.40E-025.61E-013.06E-021.15E+005.18E-022.32E+003.06E-025.31E-017.74E-02

(211.2, -1134.5)

2.02E-033.33E-021.82E-036.80E-023.73E-031.43E-011.82E-033.15E-025.36E-03

OH01302VSCDAT3.WK3 06:24 PM 03-Mar-92

GERAGHTY & MILLER, INC.

TABLE 16CANCER RISK ESTIMATES FOR AN ADULT RESIDENT AND SITE WORKER,

POINT OF MAXIMUM IMPACT, AIR EMISSIONS

Constituent

Bromodi chl oromethane*

Chloroform

1,1-Dichloroethane

1 , 1 , 2 , 2-Tet rachl oroethane

Tetrachl oroethene

Trichloroethene

Vinyl Chloride

Maximum AverageAnnual Concentration (ug/m3)

Site Border On Site

2.02E-03

3.33E-02

1.82E-03

3.73E-03

1.43E-01

3.15E-02

5.36E-03

3.40E-02

5.61E-01

3.06E-02

5.18E-02

2.32E+00

5.31E-01

7.74E-02

Slope

Factor

0.13

0.081

„._

0.2

0.0018

0.017

0.295

Exposure Dose

Resident Worker

1.68E-07

2.77E-06__

3.10E-07

1.19E-05

2.62E-06

8.91E-07

2.38E-06

3.92E-05__

3.62E-06

1.62E-04

3.71E-05

5.41E-06

Total Risk

Cancer Risk

Resident Worker

2E-08

2E-07

6E-08

2E-08

4E-08

3E-07

6E-07

3E-07

3E-06

7E-07

7E-07

6E-07

2E-06

7E-06

Notes:

- - Slope Factor not Available.* = Oral Slope Factor Used.

alco«r«v\t«bl«. U

GERAGHTY & MILLER, INC.

TABLE 17HAZARD QUOTIENTS AND HAZARD INDEX FOR AN ADULT RESIDENTAND SITE WORKER, POINT OF MAXIMUM IMPACT. AIR EMISSIONS

Constituent

Bromodi chl oromethane*

Chloroform

1,1-Dtchloroethane**

1,2-Dichloroethene*

1,1,2, 2-Tetrachl oroethane

Tetrachl oroethene

Tol uene**

Trichloroethene

Vinyl Chloride

Maximum AverageAnnual Concentration (ug/m3)

Site Border On Site

2.02E-03

3.33E-03

1.82E-03

6.80E-03

3.73E-03

1.43E-01

1.82E-03

3.15E-03

5.36E-03

3.40E-02

5.61E-01

3.06E-03

1.15E+00

5.18E-02

2.32E+00

3.06E-02

5.31E-01

7.74E-02

Slope

Factor

0.02

0.0014

0.1

0.01

0.1

0.0017

0.57

0.0005

0.0004

Exposure Dose

Resident Worker

3.92E-07

6.46E-07

3.53E-07

1.32E-06

7.24E-07

2.77E-05

3.53E-07

6.11E-07

2.08E-06

6.65E-06

1.10E-04

5.99E-07

2.25E--4

1.01E-05

4.54E-04

5.99E-06

1.04E-04

1.51E-05

HI

Cancer Risk

Resident Worker

2E-05

5E-04

4E-06

1E-04

7E-06

2E-02

6E-07

1E-03

5E-03

2E-02

3E-04

8E-02

6E-06

2E-02

1E-04

3E-01

1E-06

2E-01

4E-02

6E-01

Notes:

* = Oral RfD.** = Inhalation RfD (all other Rfds were derived from the ATSDR lexicological profiles).

GERAGHTY & MILLER, INC.

Table 18. Exposure to Onsite Workers, Air Releases from the Water Reclamation FacilityComparison of Two Sampling and Modeling EventsAlcoa-Davenport Works, Riverdale.lowa

alcoa\wrf-comp.wk1

Constituent

BromodichloromethaneChloroform1,1-Dichloroethane1,2-Dfchloroethene1 ,1 ,2,2-TetrachloroethaneTetrachloroetheneTolueneTrlchloroetheneVinyl Chloride

Total

Maximum ContaminantConcentration at the WaterReclamation Facility (ug/l)

1989 19913 6

33 702 3

12 78ND 6

500 160ND 514 3816 7

580.00 373.00

Maximum Mass ofContaminants (pounds/day)

1989 Aug/1991@12,000gpm @15,300gpm

0.43 1 .084.77 12.640.29 0.541.73 14.090.00 1 .08

72.25 28.900.00 0.902.02 6.862.31 1.26

83.80 67.37

Modelling Predicted Maximum On-SlteAnnual Average Combined Sources

Average Mass Emission Rates (ug/m3)1989 1991

0.037 0.0340.23 0.561

0.016 0.03060.15 1.15

NA 0.05184.3 2.32NA 0.0306

0.16 0.5310.17 0.0774

RiskEsCancer Effects

1989 19919.0E-09 3E-075.8E-08 3E-064.6E-09 NA

NA NANA 7E-07

4.4E-08 7E-07NA NA

8.3E-09 6E-071.6E-07 2E-06

Total Cancer Risk2.8E-07 7E-06

rtimatesThreshold Effects

1989 19912.2E-05 3E-041.3E-04 8E-029.4E-07 6E-068.7E-05 2E-02

NA 1E-042.5E-03 3E-01

NA 5E-051.2E-04 2E-017.6E-04 4E-02

Hazard Index3.6E-03 6E-01

Note: The 1989 modeling was based on the assumption that the contaminant source (production wells) were active only six months during the yearwhen cooling water was needed. Since that time Alcoa has operated production well PW-6 continuously. Therefor the 1991 modeling was for a year round source.

GERAGHTY & MILLER, INC.

IIIII• APPENDIX A

GEP PROGRAM DESCRIPTION

I

I

I

I

I

I

I

I

I

I

I

I

II

GEP Program Description

The Bowman Environmental Engineering (BEE) GEP program calculates direction-specificbuilding heights and widths. A maximum of 20 buildings and 100 stacks may be analyzed.The user must enter the location and height of each building and stack to be analyzed.I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

Program Algorithm.

Step 1 - Determining "Nearby Buildings.

The GEP program determines the stacks that are "nearby" buildings. Nearbyis defined as five times the lessor of building height or projected cross-windwidth (5L). The GEP program can calculate cross-wind projection either: (1)based on all wind directions; or, (2) based on only downwind directions. Ifa stack is not within 5L (nearby) of a building, zeros are written to thesource card (card type 6,1 in ISCST; card type 17 in ISCLT). If a stack iswithin 5L of only one building, the building height and 0.88623 times thecross-wind projection is written to the source card. If a stack is within 5Lof more than one building, the building height and 0.88623 times the cross-wind projection of the building with the greatest calculated GEP height iswritten to the source card. (Aside: the ISC models calculate an equivalentdiameter using the source card building parameters. This equivalentdiameter is used as the cross-wind projection within the ISC models. Inorder to "force" the model to use the actual cross-wind projection, a valueof 0.88623 times the actual cross-wind projection must be entered. Thisvalue is entered as both the width and length in ISCST and as width inISCLT. The constant 0.88623 converts the actual cross-wind projection(equivalent diameter) to a side length of a square. Note: the square root ofpi/4 = 0.88623)

Step 2 — Determining Direction-Specific Building Dimensions.

If a stack is not nearby a building as determined in Step 1, zeros are writtento the direction-specific cards (card type 6,4a-b in ISCST and card type 17ca-b in ISCLT). The GEP program loops through each wind-direction sector(36 sectors for ISCST or 16 sectors for ISCLT) and determines the wakearea around each building. This wake area is defined as a rectangle 5LBdownwind, 2LB upwind, and 0.5LB to either side of each building. The GEP

IIIIIIIIIIIIIIIIII

program can calculate the cross-wind projection based on either: (1) themaximum projection for all flow vectors within the sector; or, (2) the mid-sector vector only. A sector is defined as the mid-sector vector +/- one halfsector width (e.g. A mid-sector vector of 40 degrees in ISCST represents asector from 35 degrees to 45 degrees). If a stack is not within the wake areaof any building, zeros are written ,to the direction-specific card for this flowvector. If a stack is within the wake area of only one building, the buildingheight and cross-wind projection isf written to the direction-specific card. Ifa stack is within the wake of more than one building, the building height andcross-wind projection of the buildirig with the greatest calculated GEP heightfor this sector is written to the direction-specific card.

Table of Results. The GEP program produces a table that contains the GEP height foreach stack and the buildings that influence each stack. This table also contains the actualdistance from each stack to each building and the distance of influence of each stack-building combination.

GEP Graphics Output. The GEP program can produce a figure showing the buildings,stacks and wake areas. The user may select to show wake areas for a single flow vectoror for multiple flow vectors.

IIIIIIIIIIIIIIIIIII

GEP Table

Geraghty & Hi Her Engineers Inc.

Input DataFile Name: ALCOA.TAB

Date: 9-10-1991

Model: ISCLT

Wake Area Section Option: Maximum of all directions within sector.

Wake Area Shape Option: Building edge moved 2L upwind& 5L downwind.

Combine Structures: Combine buildings and tanks withinone "L" crosswind and 5.00 "L"upwind-downwind of each other.

Number of Buildings: 3

Number of Tanks: 0

Number of Stacks: 3

Plant Rotation Angle: .000%

1111111111111111111

Input Data <cont.)

Building No. 7Name: Foil MillHeight: 60

Corner East (FT)

1 1951.342 2031.663 2031.66^ 2151.745 2151.746 2313.167 2313.168 2474.589 2474.5810 2636.0011 2636.0012 2695.0613 2695.0614 2655.6815 2655.6816 2175.3617 2175.3618 1955.3619 1951.34

.00 (FT)

North (FT)

-2100.13-2100.13-2064.69-2064.69-2100.13-2100.13-2064.69-2064.69-2100.13-2100.13-2389.51-2389.11-2539.11-2539.11-2739.89-2739.89-2700.51-2700.51-2100.13

IIIIIIIIIIIIIIIIIII

Input Data (cont.)

Building No. 2Name: Water ReelHeight: 25.00 (FT) ';

v.

Corner East (FT) North (FT)

1 3010.38 -2505.642 3026.13 -2505.64 /3 3026.13 -2509.584 3081.25 -2509.585 3081.25 -2572.57 /6 3041.88 -2572.57;7 3041.88 -2568.638 3012.35 -2568.009 3010.38 -2505.64

1111111111111111111

Input Data (cont.)

Building No. 3Name: UnknownHeight: 17.00 (FT)

Corner East (FT) North (FT)

1 2943.43 -2548.902 2994.61 -2548.903 2994.61 -2564.654 2943.43 -2564.655 2943.43 -2548.90

Input Data (cont.)

Stack Parameters

Stack Height . . . . . . Location .. . . . . . v_No. (FT) East (FT) North (FT) j

IIH

_

•

1 17.00 2959.17 -2521.39

12 17.00 2959.17 -2533.24 J3 17.00 2992.66 -2647.37

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IIIII

III/

Iijiiii

GEP Table

Geraghty & Miller Engineers Inc.

STACK ID 01

critical

Flow Vector

(deg)

-11.25

11.2548.50

73.00

101.25

116.50

131.00

152.50

168.75

191.25

228.50

253.00

258.75

303.75

326.25

326.75

utf stacic

Height

(FT)

42.500

42.500

62.500

62.500

150.000

150.000

62.500

42.500

42.500

42.500

62.500

62.500

62.500

62.500

62.500

62.500

Name-1

Uate

Uate

Foil

Foil

Foil

Foil

Foil

Foil

Uate

Uate

Foil

Foil

Foil

Foil

Foil

Foil

controlling :

Name-2

Unkn ;Unkn

Uate

Uate

Uate

Unkn

Unkn

Unkn

Uate

Uate

Uate

Uate

Uate

Uate

acrucLUF*

Height

(FT)

17.000

17.000

25.000

25.000

60.000

60.000

25.000

17.000

17.000

17.000

25.000

25.000

25.000

25.000

25.000

25.000

:s

Projected

Width (FT)

145.915

139.790

1102.536

828.139

724.901

841.004

899.655

991.831

145.916

139.790

1102.537

828.140783.964

877.343

1042.217

1046.250

IIIIIIIIIIIII

GEP Table

Geraghty & Miller Engineers Inc.

STACK ID 02

uri i icai

Flow Vector

(deg)

-11.25

11.2546.50

61.75101.25118.25146.25

152.50168.75

191.25

228.50

241.75258.75

303.00326.25

326.75

btr btacK

Height(FT)

42.500

42.500

42.50062.500150.000150.000

42.500

42.50042.500

42.500

62.500

62.500

62.500

62.500

62.50062.500

Name-1

Uate

UateFoilFoilFoilFoil

Foil

Foil

Uate

UateFoil

FoilFoil

FoilFoil

Foil

control line

Name- 2

Unkn

UnknUnkn

Uate

UnknUnkn

Unkn

Unkn

Uate

Uate

Uate

Uate

UateUate

1 airuuiuni

Height(FT)

;' 17.000

17.000

17.00025.000

60.00060.000

17.00017.000

17.000

17.000

25.000

25.000

25.000

25.00025.00025.000

as .

Projected

Uidth (FT)

145.915

139.790

1055.089950.974

724.901

851.032

948.335991.831

145.916139.790

1102.537

950.976783.964

874.2261042.217

1046.250

IIIIIIIIIII

GEP Table

Geraghty & Killer Engineers Inc.

STACK ID 03

Critical GEP Stack -- Controlling Structure^Flow Vector Height Height / Projected

(deg) (FT) Name-1 Name-2 (FT) Width (FT)

.00 No structure within 5L22.50 No structure within 5L45.00 No structure within 5167.50 No structure within 5L90.00 No structure within 5L112.50 No structure within 5L135.00 No structure within 5L166.75 42.500 Wate Unkn 17.000 U6.773191.25 62.500 Wate 25.000 82.566213.75 62.500 Wate 25.000 96.111228.50 62.500 Foil Wate 25.000 1102.537247.50 No structure within 5L270.00 No structure within 5L292.50 No structure within 5L315.00 No structure within 5L337.50 No structure within 5L

IIIII• APPENDIX B

ISCLT DISPERSION MODELING OUTPUT

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IIIIIIIIIIiiIiiiiii

ISCLT - VERSION DATED 90008

BOVMAN ENVIRONMENTAL ENGINEERING VERSION 6.94

SESSION INFORMATION

INPUT DATA FILE NAME : ALC.DTA

OUTPUT LIST FILE NAME : ALC.LST

MASTER GRAPHICS FILE NAME : ALC.GRF

I'*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991

• - ISCLT INPUT DATA -

******** PAGE 1 ****

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NUMBER OF SOURCES = 3NUMBER OF X AXIS GRID SYSTEM POINTS = 41NUMBER OF Y AXIS GRID SYSTEM POINTS = 41NUMBER OF SPECIAL POINTS = 10NUMBER OF SEASONS = 1NUMBER OF WIND SPEED CLASSES = 6NUMBER OF STABILITY CLASSES = 6NUMBER OF WIND DIRECTION CLASSES = 16FILE NUMBER OF DATA FILE USED FOR REPORTS = 1THE PROGRAM IS RUN IN RURAL MODECONCENTRATION (DEPOSITION) UNITS CONVERSION FACTOR = .10000000E+07ACCELERATION OF GRAVITY (METERS/SEC**2) = 9.800HEIGHT OF MEASUREMENT OF WIND SPEED (METERS) = 10.000CORRECTION ANGLE FOR GRID SYSTEM VERSUS DIRECTION DATA NORTH (DEGREES) = .000DECAY COEFFICIENT = .OOOOOOOOE+00PROGRAM OPTION SWITCHES =1, 1, 1, 0. 0, 3, 2, 3, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1ALL SOURCES ARE USED TO FORM SOURCE COMBINATION 1DISTANCE X AXIS GRID SYSTEM POINTS (METERS )= 2000.00, 1900.00, 1800.00,

1400.00. 1300.00, 1200.00, 1100.00, 1000.00, 900.00, 800.00,400.00, 300.00, 200.00, 100.00,-600.00, -700.00, -800.00, -900.00,-1600.00, -1700.00, -1800.00, -1900.00,

DISTANCE X SPECIAL DISCRETE POINTS (METERS )=564.50, 542.80. 211.20, 58.20,

DISTANCE Y AXIS GRID SYSTEM POINTS (METERS )= 2000.00. 1900.00, 1800.00,1400.00, 1300.00, 1200.00, 1100.00, 1000.00, 900.00, 800.00,400.00, 300.00, 200.00, 100.00, .00, -100.00,-600.00, -700.00, -800.00, -900.00, -1000.00, -1100.00,-1600.00, -1700.00, -1800.00. -1900.00. -2000.00,

DISTANCE Y SPECIAL DISCRETE POINTS (METERS )= -26.90, 281.30,-1265.00, -1184.00, -1134.50, -402.00,

0, 0. 1. 1, 0,

.00,-1000.00,-2000.00,14.30, 1600.10,

-100.00,-1100.00,

-200.00,-1200.00,

1700.00,700.00,-300.00,-1300.00,

1600.00,600.00,-400.00,-1400.00,

1500.00,500.00,-500.00,-1500.00,

1725.80, 1948.70, 1948.70, 1430.60,

-200.00,-1200.00,

-23.50,

1700.00.700.00,-300.00,-1300.00,

1600.00.600.00,-400.00,-1400.00.

1500.00.500.00,-500.00,-1500.00,

-23.50, -667.40, -983.60,

I

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- AMBIENT AIR TEMPERATURE (DEGREES KELVIN) -

STABILITY STABILITY STABILITY STABILITY STABILITY STABILITYCATEGORY 1 CATEGORY 2 CATEGORY 3 CATEGORY 4 CATEGORY 5 CATEGORY 6

SEASON 1 293.0000 293.0000 293.0000 293.0000 293.0000 293.0000

- MIXING LAYER HEIGHT (METERS) -

STABILITY CATEGORY 1

KILITY CATEGORY 2ILITY CATEGORY 3ILITY CATEGORY 4

fBILITY CATEGORY 5BILITY CATEGORY 6

WIND SPEEDCATEGORY 1.180000E+04.120000E+04.120000E+04.120000E+04.100000E+05.100000E+05

WIND SPEEDCATEGORY 2.180000E+04.120000E+04.120000E+04.120000E+04.100000E+05.100000E+05

SEASON 1WIND SPEEDCATEGORY 3.180000E+04.120000E+04.120000E+04.120000E+04.100000E+05.100000E+05

WIND SPEEDCATEGORY 4.180000E+04.120000E+04.120000E+04.120000E+04.100000E+05.100000E+05

WIND SPEEDCATEGORY 5.180000E+04.120000E+04.120000E+04.120000E+04.100000E+05.100000E+05

WIND SPEEDCATEGORY 6.180000E+04.120000E+04.120000E+04.120000E+04.100000E+05.100000E+05

II

1-***

111.1•.

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ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991

- ISCLT INPUT DATA (CONT.) -

- FREQUENCY OF OCCURRENCE OF WIND SPEED, DIRECTION AND STABILITY -

SEASON 1

STABILITY CATEGORY 1

WIND SPEED WIND SPEED WIND SPEED WIND SPEED WIND SPEED WIND SPEED

DIRECTION

(DEGREES).000

22.50045.00067.50090.000112.500135.000157.500

180.000

202.500225.000

247.500

270.000

292.500315.000

337.500

CATEGORY 1

( 1.5000MPSM

.00017300

.00011800

.00000000

.00011800

.00029000

.00000000

.00005900

.00005900

.00020200

.00003000

.00026100

.00005900

.00005900

.00000000

.00014400

.00116000

CATEGORY 22.5000MPS)(

.00011400

.00045600

.00000000

.00045600

.00057000

.00000000

.00022800

.00022800

.00022800

.00011400

.00045600

.00022800

.00022800

.00000000

.00000000

.00352999

CATEGORY 3

4.3000HPS)(

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00045600

SEASON 1

CATEGORY 46.8000MPSX

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

CATEGORY 5 CATEGORY 6

9.5000MPS)(12.5000HPS)

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

STABILITY CATEGORY 2

I•

I•

1

1

DIRECTION

(DEGREES).000

22.50045.00067.50090.000

112.500

135.000157.500

180.000

202.500

225.000

247.500

270.000

292.500315.000337.500

WIND SPEEDCATEGORY 1

( 1.5000MPSM

.00021900

.00025800

.00085600

.00071300

.00101700

.00045700

.00047600

.00077100

.00042900

.00038100

.00160600

.00039100

.00027700

.00003900

.00006700

.00025500

WIND SPEEDCATEGORY 2

2.5000MPSX

.00113900

.00159400

.00284699

.00113900

.00182200

.00102500

.00125300

.00330199

.00216400

.00159400

.00295999

.00170800

.00182200

.00045600

.00079700

.00113900

WIND SPEEDCATEGORY 3

4.3000MPSX

.00057000

.00113900

.00193600

.00239099

.00136700

.00011400

.00057000

.00307399

.00136700

.00091100

.00216400

.00170800

.00148000

.00102500

.00045600

.00330199

WIND SPEEDCATEGORY 4

6.8000MPSX

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00034200

WIND SPEEDCATEGORY 5

WIND SPEEDCATEGORY 6

9.5000MPS)(12.5000MPS)

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

******** PAGE

1-***

111

1•

I•

1

ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991

- ISCLT INPUT DATA (CONT.) -

- FREQUENCY OF OCCURRENCE OF WIND SPEED, DIRECTION AND STABILITY -

SEASON 1

STABILITY CATEGORY 3

WIND SPEED WIND SPEED WIND SPEED WIND SPEED WIND SPEED WIND SPEED

DIRECTION

(DEGREES).000

22.500

45.000

67.500

90.000

112.500135.000157.500180.000

202.500225.000247.500

270.000

292.500

315.000337.500

CATEGORY 1

( 1.5000MPSX

.00010200

.00020400

.00030600

.00097800

.00114200

.00019100

.00030600

.00059800

.00030600

.00045800

.00090200

.00057100

.00035700

.00002600

.00002600

.00038600

CATEGORY 2

2.5000MPSX

.00091100

.00068400

.00159400

.00307399

.00227700

.00057000

.00159400

.00307399

.00159400

.00182200

.00352999

.00170800

.00205000

.00022800

.00022800

.00364299

CATEGORY 3

4.3000MPSX

.00193600

.00182200

.00443999

.00295999

.00330199

.00136700

.00182200

.01024598

.00739998

.00455399

.00739998

.00466799

.00614799

.00227700

.00216400

.00933598

SEASON 1

CATEGORY 4

6.8000MPSX

.00045600

.00034200

.00079700

.00045600

.00022800

.00079700

.00045600

.00273299

.00193600

.00136700

.00216400

.00091100

.00091100

.00022800

.00034200

.01138498

CATEGORY 5 CATEGORY 6

9.5000MPSX12.5000MPS)

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00011400

.00000000

.00011400

.00011400

.00000000

.00000000

.00000000

.00022800

.00034200

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

STABILITY CATEGORY 4

I•

_

•™

1

1

DIRECTION

(DEGREES).000

22.500

45.00067.500

90.000112.500135.000157.500180.000

202.500225.000

247.500

270.000

292.500

315.000

337.500

WIND SPEEDCATEGORY 1

( 1.5000MPSX

.00023800

.00017300

.00064600

.00048500

.00065500

.00007500

.00049800

.00067100

.00027100

.00055600

.00105400

.00087300

.00047500

.00009100

.00060400

.00000000

WIND SPEEDCATEGORY 2

2.5000MPSX

.00159400

.00239099

.00387099

.00500999

.00398499

.00102500

.00182200

.00421299

.00205000

.00261899

.00443999

.00193600

.00318799

.00125300

.00159400

.00136700

WIND SPEEDCATEGORY 3

4.3000MPSX

.00250499

.00330199

.01035998

.00865298

.00865298

.00671699

.00694499

.01707696

.00614799

.00626199

.00887998

.00796998

.01263697

.00523699

.00398499

.00443999

WIND SPEEDCATEGORY 4

6.8000HPSX

.00216400

.00523699

.00944898

.01024598

.00990498

.00808298

.00865298

.03722692

.01992296

.01309197

.01832896

.02823394

.04439890

.01571097

.01035998

.00000000

WIND SPEEDCATEGORY 5

WIND SPEEDCATEGORY 6

9 . 5000MPS ) ( 1 2 . 5000MPS )

.00000000

.00045600

.00079700

.00091100

.00045600

.00159400

.00205000

.00648999

.00261899

.00182200

.00683099

.01104298

.01810196

.00443999

.00170800

.00000000

.00000000

.00000000

.00000000

.00022800

.00045600

.00011400

.00000000

.00148000

.00022800

.00011400

.00341599

.00535099

.00557899

.00102500

.00045600

.00000000

******** PAGE 3 ***

1**

11.i•

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ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991

- ISCLT INPUT DATA (CONT.) -

- FREQUENCY OF OCCURRENCE OF WIND SPEED, DIRECTION AND STABILITY -

SEASON 1

STABILITY CATEGORY 5

WIND SPEED WIND SPEED WIND SPEED WIND SPEED WIND SPEED WIND SPEED

DIRECTION(DEGREES)

.00022.50045.000

67.500

90.000112.500

135.000

157.500

180.000202.500225.000

247.500270.000

292.500315.000

337.500

CATEGORY 1

( 1.5000MPSX

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00340499

CATEGORY 22.5000HPSX

.00034200

.00102500

.00330199

.00819698

.00478199

.00113900

.00261899

.00637599

.00148000

.00193600

.00364299

.00182200

.00182200

.00136700

.00034200

.00295999

CATEGORY 3

4.3000MPSX

.00034200

.00068400

.00205000

.00352999

.00432699

.00273299

.00261899

.01354797

.00569299

.00489599

.00717298

.00956298

.01309197

.00671699

.00295999

.00000000

SEASON 1

CATEGORY 46.8000MPSX

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

CATEGORY 5 CATEGORY 6

9.5000MPSX12.5000MPS)

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

STABILITY CATEGORY 6

1•

1•

1

1

DIRECTION

(DEGREES).000

22.500

45.00067.500

90.000112.500

135.000157.500180.000202.500225.000

247.500

270.000

292.500

315.000

337.500

WIND SPEEDCATEGORY 1

( 1.5000MPSX

.00118100

.00194800

.00571299

.01841296

.01185798

.00313899

.00495799

.01363397

.00486299

.00707198

.01243497

.00442999

.00372399

.00064200

.00106700

.00000000

WIND SPEEDCATEGORY 2

2.5000MPSX

.00159400

.00148000

.00489599

.01536897

.00739998

.00159400

.00352999

.01149898

.00443999

.00614799

.01400297

.00683099

.00557899

.00148000

.00170800

.00000000

WIND SPEEDCATEGORY 3

4.3000MPSX

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

WIND SPEEDCATEGORY I*

6.8000HPSX

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

WIND SPEEDCATEGORY 5

WIND SPEEDCATEGORY 6

9 . 5000MPS X 1 2 . 5000MPS )

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

.00000000

******** PAGE 4 **

I•*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991

• - ISCLT INPUT DATA (CONT.) -

I

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- VERTICAL POTENTIAL TEMPERATURE GRADIENT (DEGREES KELVIN/METER) -

(ABILITY CATEGORY 1STABILITY CATEGORY 2

KILITY CATEGORY 3ILITY CATEGORY 4ILITY CATEGORY 5

STABILITY CATEGORY 6

STABILITY CATEGORY 1

(ABILITY CATEGORY 2ABILITY CATEGORY 3ABILITY CATEGORY 4

STABILITY CATEGORY 5VABILITY CATEGORY 6

WIND SPEEDCATEGORY 1.0000005+00.OOOOOOE+00.OOOOOOE+00

.OOOOOOE+00

.200000E-01

.350000E-01

WIND SPEEDCATEGORY 1.700000E-01.700000E-01.100000E+00.150000E+00.350000E+00.550000E+00

WIND SPEEDCATEGORY 2.OOOOOOE+00

.OOOOOOE+00

.OOOOOOE+00

.OOOOOOE+00

.200000E-01

.350000E-01

- WIND

WIND SPEEDCATEGORY 2.700000E-01.700000E-01.100000E+00.150000E+00.350000E+00.550000E+00

WIND SPEEDCATEGORY 3.OOOOOOE+00.OOOOOOE+00.OOOOOOE+00.OOOOOOE+00.200000E-01.350000E-01

WIND SPEEDCATEGORY 4.OOOOOOE+00.OOOOOOE+00.OOOOOOE+00.OOOOOOE+00.200000E-01.350000E-01

WIND SPEEDCATEGORY 5.OOOOOOE+00.OOOOOOE+00.OOOOOOE+00.OOOOOOE+00.200000E-01.350000E-01

WIND SPEEDCATEGORY 6.OOOOOOE+00.OOOOOOE+00.OOOOOOE+00

.OOOOOOE+00

.200000E-01

.3SOOOOE-01

PROFILE POWER LAW EXPONENTS -

WIND SPEEDCATEGORY 3.700000E-01.700000E-01.100000E+00.150000E+00.350000E+00.550000E+00

WIND SPEEDCATEGORY 4.700000E-01.700000E-01.100000E+00.150000E+00.350000E+00.550000E+00

WIND SPEEDCATEGORY 5.700000E-01.700000E-01.100000E+00.150000E+00.3SOOOOE+00.550000E+00

WIND SPEEDCATEGORY 6.700000E-01.700000E-01.100000E+00.150000E+00.350000E+00.5SOOOOE+00

******** PAGE 5 **

I-•*<

I-*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991

- SOURCE INPUT DATA -

******** PAGE 6 ****

K SOURCE SOURCE X Y EMISSION BASE /NUMBER TYPE COORDINATE COORDINATE HEIGHT ELEV- /

. P (M) (H) (M) ATION /- SOURCE DETAILS DEPENDING ON TYPE -

I

IIIIIIIIIIIII

1 STACK 901.96 -768.52 5.18 .00 GAS EXIT TEMP (DEC K)= 294.26, GAS EXIT VEL. (M/SEC>= 3.05,

STACK DIAMETER (H)= 7.833, HEIGHT OF ASSO. BLDG. (M)= -5.18, WIDTH OFASSO. BLDG. (H)= 16.59, WAKE EFFECTS FLAG = 0

- DIRECTION SPECIFIC BUILDING DIMENSIONS -

:TOR15913

DSBH

5.2.7.6.5.2.18.3,

DSBU

44.5.239.0.44.5.220.9,

I WAKE0000

SECTOR

261014

DSBH

5.2.7.6,5.2,18.3,

DSBW42.6,267.4,42.6,256.3,

I WAKE0000

SECTOR37

1115

DSBH

7.6.7.6,7.6.7.6.

DSBW

336.0.317.7,336.0,274.2,

I WAKE0000

SECTOR481216

DSBH7.6,7.6.7.6.5-2,

DSBW252.4,

318.9,252.4,

302.3,

I WAKE0000

SOURCE STRENGTHS ( GRAMS PER SEC

SEASON 1 SEASON 2 SEASON1.00000E+00

SEASON 4

RNING - HW/HB > 5 FOR SOURCE

1. 2, 3, 4,

1 PROG. USES LATERAL VIRTUAL DIST. FOR UPPER BOUND OF CONCENTRATION (DEPOSITION) IN SECTOR(S):

5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16.

LOWER BOUND IS DESIRED SET THE DIRECTION SPECIFIC BUILDING HEIGHT TO < 0 (WAKE EFFECTS FLAG) AND RERUN.

RNING - DISTANCE BETWEEN SOURCE 1 AND POINT X,Y= 900.00, -800.00 IS LESS THAN PERMITTED FOR SECTOR(S):14,

I*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 7 ****

I** ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAHS PER CUBIC HETER

- GRID SYSTEM RECEPTORS -• - X AXIS (DISTANCE, METERS) -• 2000.000 1900.000 1800.000 1700.000 1600.000AXIS (DISTANCE , METERS ) - CONCENTRATION -

) DUE TO SOURCE 1

1500.000 UOO.OOO 1300.000 1200.000

1

1•

1•

1•

I•

-2000.000-1900.000-1800.000-1700.000-1600.000-1500.000-UOO.OOO-1300.000-1200.000-1100.000-1000.000-900.000-800.000-700.000-600.000-500.000-400.000-300.000-200.000-100.000

.000100.000200.000300.000400.000500.000600.000700.000800.000900.0001000.0001100.0001200.0001300.0001400.0001500.0001600.0001700.0001800.0001900.0002000.000

.172522

.179996

.196353

.219516

.245517

.274501

.306488

.341352

.408094

.579165

.762650

.9516161.1381021.1396591.050438.954874.856979.775559.788553.796093.798353.795794.789041.778772.719292.648092.585346.530007.481497.438246.399779.365367.334735.307396.282932.260983.241240.223435.207333.193807.186081

.185389

.194707

.203733

.224248

.253877

.287604

.325667

.365708

.411157

.593698

.8214101.0580241.2927051.2912011.1737701.049086.923190.874747.882697.884538.880739.872012.859182.787771.703313.629785.565702.509739.460734.417938.379991.346225.316238.289611.265893.244702.225710.212929.203937.195469.187495

.199093

.210598

.222124

.233228

.259431

.297912

.342432

.393200

.449974

.594734

.8809531.1833641 .4855421.4748011.3198721.154636.989652.990865.990942.984223.971862.954869.867500.765862.678696.603830.539345.483603.435225.393064.356293.323654.294788.269235.246667.235352.224785.214871.205567.196835.188633

.213551

.227623

.242168

.256782

.270781

.305466

.358090

.419921

.489638

.571601

.9353871.331486.731635.712787.486555.254474.131392.127444.1141271.0956891.071460.961887.837281.732451.644057.569221.505552.451092.404249.363736.328511.297662.275418.261971.249402.237661.226692.216441.206854.197881.189477

.228617

.245651

.263791

.282742

.301898

.320053

.367902

.438446

.530409

.637408

.9699341.5026312.0503502.018115.698687.374430.296538.273651.246641.217209.076323.919855.791413.685668.598106.525096.463760.411844.367583.329590.309775.293962.278851.264777.251679.239500.228168.217613.207772.198588.190006

.244068

.264448

.286780

.310987

.336689

.362392

.380809

.450895

.566854

.708818

.9577911.7043992.4927922.4349171 .9578721.5748231.5228781.4625241 .4009461.2156181.014915.855919.727286.623853.539838.470869.413656.371539.351027.331831.313928.297254.281629.266979.253401.240829.229175.218357.208299.198937.190207

.255958

.283646

.310735

.341138

.374252

.406813

.443431

.479287

.589521

.779597

.9928591 .8676593.0415172.9648702.2507681.9191331.7961491 .6788491.4001571.125945.921240.765923.642766.545891.468740.428204.402527.378668.356572.336140.317260.299814.283684.268524.254523.241614.229688.218650.208416.198911.190067

.238797

.274891

.320695

.372456

.413556

.461507

.516720

.577562

.636878

.8209991.1550192.0166533.9680113.8160742.6487822.3942912.1230891.6741081.275527.992982.790670.643879.541201.504119.470057.438945.410575.384697.361070.339470.319691.301546.284872.269365.255013.241827.229683.218476.208109.198500.189577

.217123

.249373

.290581

.343705

.415012

.513795

.598125

.695550

.815355

.9331411.3054722.0193265.4868975.1993363.5974212.9867702.1432371.4754011.065974.802016.670717.612893.566918.522342.483085.448296.417277.389464.364407.341739.321155.302403.285268.269469.254842.241448.229148.217822.207369.197698.188732

III

I-*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 8 ****

I** ANNUAL GROUND LEVEL CONCENTRATION ( HICROGRAHS PER CUBIC METER

- GRID SYSTEM RECEPTORS -

I - X AXIS (DISTANCE, METERS) -

• 1100.000 1000.000 900.000 800.000 700.000

AXIS (DISTANCE , METERS ) - CONCENTRATION -

) DUE TO SOURCE 1 (CONT.) **

600.000 500.000 400.000 300.000

1

1•

1•

1•

1•

-2000.000

-1900.000

-1800.000

-1700.000

-1600.000-1500.000-1400.000-1300.000-1200.000-1100.000

-1000.000-900.000

-800.000

-700.000

-600.000

-500.000

-400.000

-300.000

-200.000

-100.000

.000

100.000

200.000

300.000

400.000

500.000

600.000

700.000

800.000

900.000

1000.000

1100.0001200.000

1300.000

1400.000

1500.0001600.0001700.0001800.000

1900.000

2000.000

.191064

.217936

.252272

.296249

.356325

.440996

.566798

.770572

1.048088

1.344176

1 .642618

2.649032

8.169444

7.825603

5.2405523.0156511.768346

1.116304

.935978

.819477

.724614

.648034

.590445

.538661

.494286

.455954

.422438

.392841

.366493

.342885

.321615

.302359

.284855

.268794

.253998

.240468

.228073

.216685

.206194

.196503

.187531

.161051

.181128

.206419

.238133

.281618

.342673

.433184

.583906

.8633041.4551832.8752294.27015414.12685015.4894305.1625292.394257

1.735540

1.329156

1.071434

.898619

.774282

.679510

.610284

.552329

.503227

.461668

.425910

.394740

.367281

.342886

.321057

.301409

.283633

.267374

.252482

.238889

.226464

.215070

.204588

.194920

.185978

.128723

.141104

.155960

.173379

.196438

.226643

.266991

.327426

.425873

.605449

.960490

1.8065623.82667818.7796706.6008073.4527892.1739421.551301

1.196799

.974733

.822281

.710835

.632653

.566734

.513002

.468228

.430193

.397289

.368709

.343489

.320995

.300994

.282864

.266339

.251267

.237696

.225158

.213762

.203301

.193585

.184649

.140500

.155103

.172909

.194031

.222598

.260795

.313259

.393779

.527955

.7806401.408013

4.63792510.3059305.939969

8.610558

6.592432

3.863497

2.617231

1.918741

1.498695

1.219636

1.022810.888054.776765

.688430

.616745

.557374

.507366

.464660

.427759

.395562

.367229

.342118

.319741

.299522

.281308

.264871

.249976

.236423

.224048

.212709

.150824

.167200

.187230

.210962

.243229

.286294

.345422

.432594

.6571561.1815482.2605463.567426

4.342175

2.852691

2.1797773.028028

3.3528913.209398

2.479748

1.9362121.5644371.3125311.121310.971291.852503.756670.677866.612012.556229

.508427

.467056

.430941

.399430

.371288

.346056

.323520

.303302

.285082

.268594

.253615

.239958

.159450

.177063

.198531

.224871

.257668

.302298

.429518

.624263

.9348621 .4499262.0124562.5129702.6065081.948379

1.381058

1.254478

1.700198

2.006098

2.073226

2.036213

1.841414

1.557929

1.3238741.143350

1.000091

.884162

.788748

.709074

.641709

.584129

.534446

.491218

.453734

.420316

.390460

.363898

.340144

.318804

.299550

.282111

.266258

.166241

.184541

.206658

.246679

.320989

.424384

.569817

.7757421.0726911 .404141

1.7535631 .968090

1.892717

1.493146

.962098

.944899

.885507

1.148835

1.387350

1.487462

1.512618

1.5205091 .4853371.288519

1.127689

.996447

.887839

.796828

.719724

.653763

.596841

.547439

.504589

.466353

.432336

.402108

.375116

.350902

.329089

.309363

.291460

.171183

.207390

.258129

.323341

.407862

.516500

.661876

.8594361.0823341 .3270371.5886601.603443

1.5221771.237512.860991.727266

.716813

.692769

.867144

1.0429381.149479

1.2006371.2131361.204069

1.1815201.091940

.973758

.874112

.789301

.716515

.653567

.599440

.551591

.509028

.471352

.437871

.407978

.381171

.357034

.335219

.315434

.214069

.258670

.314114

.383609

.471377

.581994

.720020

.8839831.0750691.285172

1 .4500291.3719221.2729501.058810

.784732

.578892

.588905

.584731

.571964

.697700

.840737

.925481

.972714

.994376

.998334

.990138

.973691

.940300

.849881

.771873

.704170

.645935

.594087

.548050

.507257

.470968

.438539

.409446

.383240

.359553

.338067

III

11

** ANNUAL

I•AXIS (DISTANCE

-2000.000

1 -1900.000

-1800.000

-1700.000

-1600.000

• -1500.000

• -1400.000

-1300.000

1 -1200.000-1100.000-1000.000

1 -900.000

-800.000

-700.000

-600.000• -500.000

• -400.000

-300.000

1 -200.000

-100.000.000

_ 100.000

• 200.000

™ 300.000

400.000

1 500.000

600.000700.000

1 800.000

900.000

1000.000

_ 1100.000

• 1200.000* 1300.000

1400.000

1 1500.000

1600.0001700.000

1 1800.000

1900.000

2000.000

1

1

1

GROUND LEVEL CONCENTRATION

- Water Reclamation Faclility Modeling - 1991

( MICROGRAMS PER CUBICMETER ) DUE

******** n*/*r-

TO SOURCE

rMUC

1 (CONT.)

o ****

**

- GRID SYSTEM RECEPTORS -

200.000

, METERS

.253272

.300600

.358274

.428901

.515682

.622319

.752363

.8980891.0688561.2519321.2891271.2095351.115872.943140.727718.520781

.490041

.497261

.498356

.494549

.588140

.694493

.764877

.808680

.832941

.842924

.842552

.834736

.821647

.804914

.749425

.687305

.632063

.583230

.539879

.501239

.466661

.435600

.407596

.382262

.359271

100.000

- X

.000AXIS (DISTANCE,

-100.000

METERS) -

-200.000 -300.000 -400.000 -500.000 -600.000

) - CONCENTRATION -

.285313

.333769

.391732

.461207

.544489

.650517

.774883

.9133891.066315 1

1.213988 11.158338 11.081720.996586.853536.678915.509207.418441.433046.438263.437783.432536.503770.588057.646807

.685857

.709834

.722358

.726243

.723673

.716318

.706474

.693434

.665432

.614474

.569120

.528594

.492253

.459548

.430021

.403274

.378979

.310726

.359058

.415890

.482694

.570350

.674171

.790393

.918106

.054611

.112999

.054826

.982164

.906466

.785240

.641662

.501828

.369631

.376463

.384899

.388242

.387449

.383371

.439341

.507369

.556609

.590908

.613431

.626738

.632887

.634268

.631072

.624250

.615041

.604168

.592125

.552997

.515268

.481245

.450468

.422545

.397144

.330199

.377484

.432224

.505862

.593592

.691449

.799157

.9155091.0380131.020583.965956.902923.835085.732025.609638.488262.372988.329792.339848.345692.347843.346889.343435.388304.444070

.485625

.515621

.536289

.549493

.557485

.560359

.559198

.555224

.549128

.541429

.532538

.522774

.500677

.468924

.440053

.414387

.344489

.390084

.452724

.527627

.610846

.702378

.801682

.907473

.980685

.938681

.888499

.831777

.770903

.681659

.576989

.472581

.372203

.291133

.301893

.309144

.313183

.314408

.313259

.310167

.346759

.393097

.428443

.454685

.473567

.486809

.494699

.498386

.498962

.497070

.493238

.487893

.481383

.473991

.465937

.455788

.429651

.354347

.408148

.472649

.544018

.622367

.707490

.798726

.894815

.906050

.866986

.821213

.770074

.715431

.637556

.547101

.456484

.368526

.285509

.269705

.277665

.282872

.285583

.286114

.284798

.281966

.312234

.351203

.381669

.405030

.422241

.434106

.441890

.446346

.448097

.447662

.445472

.441880

.437177

.431607

.425368

.419519

.370247

.426195

.487853

.555374

.628717

.707558

.791198

.869473

.839691

.803646

.762021

.715899

.666739

.598298

.519454

.440213

.362720

.288778

.242212

.250444

.256329

.260028

.261763

.261787

.260360

.257731

.283290

.316416

.342874

.363228

.378516

.389670

.397384

.402249

.404763

.405344

.404347

.402065

.398746

.395200

.390652

.386510

.440131

.498692

.562229

.630601

.703416

.780001

.808287

.780407

.747269

.709435

.667776

.623432

.562919

.493705

.423971

.355368

.289330

.226989

.226798

.233030

.237360

.239941

.240962

.240627

.239331

.236933

.258516

.286977

.309773

.327739

.341613

.352021

.359511

.364551

.367544

.368831

.368703

.367405

.365852

.362971

.399386

.450303

.505645

.565190

.628735

.695874

.765980

.753164

.727206

.696782

.662368

.624660

.584569

.530769

.469634

.407922

.346921

.287778

.231431

.206157

.212518

.217226

.220387

.222139

.222791

.222259

.220855

.218524

.236895

.261523

.281529

.297550

.310147

.319819

.326999

.332065

.335342

.337111

.338081

.337782

.336477

1-** ISCLT ************* Alcoa Davenport Works

1** ANNUAL GROUND LEVEL

1•AXIS (DISTANCE

-2000.000

1 -1900.000-1800.000-1700.000-1600.000

• -1500.000• -1400.000

-1300.000

1 -1200.000-1100.000-1000.000

1 -900.000-800.000-700.000-600.000

1 -500.000• -400.000

-300.000

1 -200.000-100.000

.000

1 100.000200.000300.000400.000

1 500.000600.000700.000

1 800.000900.0001000.000

11100.0001200.0001300.0001400.000

1 1500.0001600.0001700.000

1 1800.0001900.0002000.000

1

1

1

CONCENTRATION

- Water Reclamation Faclility Modeling - 1991

( MICROGRAMS PER CUBIC METER ) DUE

******** PAGE

TO SOURCE 1 (CONT.)

10 ****

**

- GRID SYSTEM RECEPTORS -- X

-700.000 -800.000 -900.000, METERS

.409121

.457477

.509351

.564864

.623806

.685651

.723454

.703383

.679274

.651346

.619990

.585777

.549431

.501378

.447085

.392198

.337734

.284618

.233630

.188051

.194398

.199306

.202849

.205332

.206493

.206681

.205897

.204362

.202222

.218095

.239602

.257278

.271620

.283076

.292044

.298872

.303865

.307292

.309982

.311071

.311187

AXIS (DISTANCE,-1000.000

METERS) --1100.000 -1200.000 -1300.000 -1400.000 -1500.000

) - CONCENTRATION -

.415728

.461699

.510417

.562215

.616836

.673393

.677195

.658303

.635933

.610274

.581650

.550534

.517496

.474388

.425938

.376900

.328087

.280249

.234035

.189971

.178335

.183474

.187304

.189998

.191645

.192283

.192113

.191247

.189788

.187834

.201659

.220567

.236268

.249160

.259599

.267907

.274365

.279330

.283319

.285722

.287122

.419659

.462910

.508860

.557305

.607981

.650327

.635539

.617370

.596615

.573009

.546829

.518453

.488350

.449522

.406095

.362100

.318193

.274988

.233178

.192937

.164256

.169275

.173164

.176075

.178009

.179100

.179439

.179117

.178224

.176843

.175047

.187179

.203908

.217928

.229558

.239091

.246914

.253388

.258163

.261742

.264279

.421494

.462121

.505036

.550086

.597010

.611437

.597597

.580651

.561307

.539515

.515365

.489478

.462038

.426920

.387779

.348100

.308512

.269363

.231177

.194350

.159122

.156398

.160362

.163409

.165615

.167050

.167789

.167908

.167483

.166585

.165282

.163635' .174341.189226.201803.212488.221262.228689.234507.239108.242644

.421561

.459680

.499738

.541581

.584948

.575415

.562286

.546788

.528973

.508877

.486697

.462927

.437754

.405893

.370537

.334665

.298750

.263158

.228289

.194483

.162016

.144833

.148790

.151942

.154337

.156030

.157082

.157556

.157515

.157022

.156134

.154907

.153391

.162896

.176384

.187776

.197496

.205604

.212304

.217786

.222194

.420153

.455893

.493279

.532159

.552923

.542492

.529985

.515399

.498788

.480256

.459959

.438087

.414905

.385918

.353896

.321390

.288774

.256394

.224575

.193601

.163715

.135094

.138341

.141542

.144062

.145944

.147237

.147994

.148268

.148111

.147575

.146707

.145554

.144351

.152910

.164875

.175265

.184062

.191504

.197737

.202899

.417523

.451021

.485921

.522069

.522425

.512371

.500476

.486752

.471251

.454062

.435320

.415196

.393897

.367449

.338333

.308775

.279080

.249542

.220434

.192000

.164451

.137963

.128885

.132094

.134689

.136705

.138181

.139162

.139690

.139813

.139572

.139012

.138339

.137345

.136097

.143741

.154609

.163990

.172047

.178917

.184724

.413890

.445287

.477873

.502471

.494410

.484744

.473447

.460534

.446052

.430083

.412741

.394172

.374549

.350353

.323792

.296824

.269707

.242686

.215994

.189839

.164409

.139856

.120306

.123492

.126125

.128231

.129844

.130999

.131733

.132086

.132093

.131939

.131447

.130676

.129712

.128560

.135467

.145313

.153873

.161272

.167628

.409447

.438881

.469320

.476452

.468626

.459353

.448630

.436475

.422931

.408069

.391990

.374816

.356694

.334494

.310188

.285509

.260673

.235889

.211355

.187251

.163739

.140959

.119023

.115647

.118288

.120450

.122162

.123451

.124350

.124890

.125226

.125222

.124963

.124422

.123680

.122763

.121697

.127953

.136917

.144753

.151569

1** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE ^ **<

™ ** ANNUAL GROUND LEVEL CONCENTRATION ( HICROGRAMS PER CUBIC METER ) DUE TO SOURCE 1 (CONT.) **- GRID SYSTEM RECEPTORS -

I•AXIS (DISTANCE

-2000.000

_- 1900. 000

• - 1800. 000

'-1700.000

-1600.000

1-1500.000

-1400.000

-1300.000

1-1200.000-1100.000-1000.000

_ -900.000

• -800.000

• -700.000-600.000

1 -500.000

-400.000

-300.000

1 -200.000

-100.000

.000

100.000

• 200.000

™ 300.000

400.000

1 500.000

600.000

700.000

1 800.000

900.0001000.0001100.000

• 1200.000• 1300.000

1400.000

1 1500.000

1600.000

1700.000

1 1800.0001900.000

2000.000

1

1

1

-1600.000 -1700.000, METERS

.404352

.431956

.458745

.452427

.444842

.435964

.425792

.414345

.401663

.387808

.372869

.356950

.340177

.319751

.297445

.274796

.251987

.229197

.206596

.184338

.162567

.141406

.120957

.108479

.111104

.113297

.115075

.116466

.117494

.118348

.118817

.118951

.118837

.118503

.117972

.117267

.116412

.115422

.121115

.129305

.136500

- X-1800.000

AXIS (DISTANCE,-1900.000

METERS) --2000.000

) - CONCENTRATION -

.398742

.424638

.436378

.430198

.422867

.414376

.404726

.393938

.382049

.369113

.355206

.340420

.324862

.306021

.285492

.264652

.243652

.222645

.201778

.181187

.160996

.141313

.122234

.103838

.104509

.106710

.108532

.110084

.111324

.112183

.112735

.113027

.113083

.112926

.112578

.112060

.111392

.110592

.109673

.114872

.122376

.393352

.417051

.415626

.409592

.402522

.394408

.385255

.375080

.363920

.351824

.338855

.325094

.310635

.293211

.274272

.255044

.235662

.216254

.196949

.177864

.159108

.140779

.122961

.105724

.098569

.100812

.102650

.104209

.105448

.106383

.107052

.107476

.107676

.107671

.107482

.107128

.106626

.105993

.105243

.104392

.109150

.387113

.401973

.396942

.390943

.383654

.375904

.367218

.357615

.347127

.335798

.323683

.310852

.297388

.281241

.263723

.245943

.228012

.210043

.192146

.174426

.156976

.139884

.123333

.107254

.093073

.095233

.097108

.098683

.099963

.100977

.101741

.102274

.102595

.102721

.102670

.102458

.102102

.101617

.101017

.100315

.099563

.380701

.383970

.379015

.373233

.366607

.359088

.350479

.341409

.331540

.320913

.309576

.297591

.285027

.270031

.253796

.237316

.220691

.204020

.187398

.170950

.154784

.138847

.123282

.108147

.093492

.090090

.091954

.093538

.094860

.095934

.096774

.097398

.097820

.098057

.098124

.098037

.097809

.097455

.096988

.096454

.095799

-

*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991

- DISCRETE RECEPTORS -

X Y CONCENTRATION X Y CONCENTRATION X Y CONCENTRATION

DISTANCE DISTANCE DISTANCE DISTANCE DISTANCE DISTANCE

I-**

IIDI

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

******** PAGE 12 ***

** ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAMS PER CUBIC METER ) DUE TO SOURCE 1 (CONT.) **

IETERS) (METERS )

K.31948.7564.558.2

-26.9

-23.5-1265.0-402.0

.394267

.840137

.780524

.395339

(METERS) (METERS ) (METERS) (METERS )

1600.11948.7542.8

281.3-667.4-1184.0

.7039891.1812161.090236

1725.81430.6211.2

- PROGRAM DETERMINED MAXIMUM 10 VALUES -

X Y CONCENTRATIONCOORDINATE COORDINATE

(METERS) (METERS )

900.001000.001000.00800.00800.001100.001100.00900.00800.00800.00

-700.00-700.00-800.00-800.00-600.00-800.00-700.00-600.00-500.00-700.00

18.77967015.48943014.12685010.3059308.6105588.1694447.8256036.6008076.5924325.939969

-23.5-983.6-1134.5

1.0502931.0365221.190580

1**<

II

*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991

- SOURCE INPUT DATA -

PAGE 13 **

SOURCE SOURCE X Y EMISSION BASE /

[NUMBER TYPE COORDINATE COORDINATE HEIGHT ELEV-/

P (M) (M) (M) ATION /

•l (M) /

- SOURCE DETAILS DEPENDING ON TYPE -

I

I

I

I

I

I

I

I

I

I

I

I

I

I

I

2 STACK 901.96 -772.12 5.18 .00 GAS EXIT TEMP (DEC K)= 294.26, GAS EXIT VEL. <M/SEC}=STACK DIAMETER (H)= 7.833, HEIGHT OF ASSO. BLDG. (M)=ASSO. BLDG. (M)= 16.59, WAKE EFFECTS FLAG = 0

3.05,-5.18, WIDTH OF

- DIRECTION SPECIFIC BUILDING DIMENSIONS -

TOR DSBH DSBW IWAKE SECTOR DSBH DSBW IWAKE SECTOR DSBH DSBW IWAKE SECTOR DSBH DSBW IWAKE

15

9

13

5.2.

5.2.

5.2,

5.2,

16.6,

16.6,

16.6.

16.6,

0

0

0

0

2

6

10

U

5.2,

5-2,

5-2,

5.2,

16.6,

16.6,

16.6,

16.6,

0

0

0

0

3

7

11

15

5.2.

5.2.

5.2.

5.2.

16.6,

16.6,

16.6,

16.6,

0

0

0

0

I*

8

12

16

5.2.

5.2,

5.2.

5.2.

16.6,

16.6,

16.6,

16.6,

0

0

0

0

- SOURCE STRENGTHS ( GRAMS PER SEC

SEASON 1 SEASON 2 SEASON 3 SEASON 4

1.00000E+00

I*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE U

I** ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAMS PER CUBIC METER

- GRID SYSTEM RECEPTORS -

• - X AXIS (DISTANCE, METERS) -

M 2000.000 1900.000 1800.000 1700.000 1600.000

AXIS (DISTANCE , METERS ) - CONCENTRATION -

) DUE TO SOURCE 2

1500.000 1400.000 1300.000 1200.000

I

ii§iiiiiIiiiiiI

-2000.000

1-1900.000-1800.000-1700.000-1600.000

1 -1500.000'-UOO.OOO-1300.000

f -1200. 000-1100.000-1000.000

, -900.000i -800.000' -700.000-600.000-500.000-400.000-300.000

I -200. 000-100.000

.000100.000200.000300.000400.000

[ 500.000600.000700.000

I 800. 000900.0001000.0001100.0001200.0001300.0001400.000

1 1500.0001600.0001700.000

1 1800.0001900.0002000.000

.165333

.171005

.185637

.206164

.229002

.254213

.281736

.311328

.370525

.513613

.665684

.821843

.976068

.974588

.907655

.835423

.760944

.700290

.703288

.704272

.702954

.699247

.693230

.685088

.637190

.581270

.531117

.486139

.445780

.409526

.376737

.347035

.320319

.296240

.274490

.254801

.236941

.220705

.205915

.193488

.185774

.178684

.186119

.192784

.210874

.236735

.265808

.298155

.333606

.371642

.525331

.711245

.9045331 .0960101.0912131.006083.913114.818683.779455.776941.772532.766030.757401.746767.690350.625333.567609.516347.470775.430192.393979.361563.332258.305920.282286.261024.241847.224498.212552.203582.195135.187181

.193136

.202719

.211780

.219728

.242598

.276000

.314008

.356646

.403215

.521315

.749474

.9913641.2327301.2253931.111923.990501.879607.870228.859692.847539.833955.818922.751187.674572.607433.548549.496802.451207.410916.375196.343431.314892.289292.266368.246125.234908.224368.214479.205200.196491.188311

.208673

.220843

.232889

.244217

.253899

.283626

.328120

.375740

.433879

.503147

.7952651.1109121.4293771.4158821.2595751.094276.988864.965516.948611.929055.905876.822269.730270.651060.582719.523553.472117.427201.387804.353096.322392.295023.274847.261439.248906.237200.226262.216040.206479.197530.189148

.225219

.240461

.256172

.271828

.286512

.298599

.335663

.397933

.471012

.553931

.8278261.2529231 .689557.665733.442975.211089.132792.0866871.0449321.014182.908165.794678.699292.618836.550564.492245.442086.398661.360838.327689.309103.293333.278256.264224.251166.239023.227725.217201.207389.198230.189672

.242623

.261441

.281568

.302658

.323941

.341294

.357550

.415280

.507006

.615768

.8215761.4155062.0434582.0024931 .6689631.3920661.3053131.2242591.1535631.009004.869778.753655.656949.577159.510600.454488.406719.370659.350205.331072.313221.296598.281013.266408.252872.240341.228722.217936.207909.198573.189868

.257158

.283525

.308832

.336571

.364635

.394774

.424222

.448293

.535205

.679902

.8565981.6001362.5704182.4970651.9621541.6693211.5065111.3732191.158930.961535.809947.696921.602309.525699.462847.427102.401507.377728.355704.335340.316523.299134.283048.267936.253983.241115.229227.218223.208020.198543.189725

.239918

.276306

.322512

.372981

.411690

.455624

.503902

.552660

.591115

.7395481.0013101.7543033.4073193.2640252.3679102.0413101.7465661 .3847061.095336.886377.733356.622735.539654.502661.468725.437734.409471.383693.360155.338634.318926.300845.284229.268763.254461.241320.229216.218044.207709.198130.189233

.218118

.250636

.292220

.345855

.417943

.517997

.596066

.683883

.784954

.8614881.1618011.7396094.9113544.5702773.2109952.5327281.7998091.295422.980084.775760.668271.610739.564994.520665.481601.446977.416097.388403.363450.340871.320367.301685.284612.268858.254283.240935.228676.217388.206968.197326.188387

I***

IISCLT ************** Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 15

** ANNUAL GROUND LEVEL CONCENTRATION ( HICROGRAHS PER CUBIC METER- GRID SYSTEM RECEPTORS -

I - X AXIS (DISTANCE, METERS) -1100.000 1000.000 900.000 800.000 700.000

AXIS (DISTANCE , METERS ) - CONCENTRATION -

) DUE TO SOURCE 2 (CONT.) **

600.000 500.000 400.000 300.000

I

iii

Iiiiiiiiiii

-2000.000-1900.000-1800.000-1700.000-1600.000-1500.000-UOO.OOO-1300.000-1200.000-1100.000-1000.000-900.000-800.000-700.000-600.000-500.000-400.000-300.000-200.000-100.000

.000100.000200.000300.000400.000500.000600.000700.000800.000900.0001000.0001100.0001200.0001300.000UOO.OOO1500.0001600.0001700.0001800.0001900.0002000.000

.191889

.218981

.253632

.298045

.358808

.444599

.572351

.7801301.0486691.3142231.5196602.4061787.9012486.8530704.5485632.6634601 .6299231.094556.930863.815566.721341.645372.588173.536769.492656.454533.421186.391729.365499.341992.320808.301627.284189.268180.253435.239953.227601.216251.205793.196132.187187

.161664

.181895

.207398

.239428

.283402

.345261

.437183

.591017

.8775391.4869322.9101723.92446912.88177012.0887004.6125382.3644451.7172481.3177041.063674.893300.770198.676360.607707.550240.501464.460155.424597.393585.366259.341973.320237.300667.282962.266755.251919.238375.225993.214637.204189.194551.185637

.129111

.141554

.156512

.174063

.197341

.227845

.268654

.330081

.430664

.614246

.9789911.8548383.96229916.4536906.3383003.3663062.1350231.5291921.182724.965320.815481.705681.628575.563471.510368.466033.428290.395743.367288.342285.319934.300054.282025.265576.250620.237075.224636.213248.202788.193153.184290

.140943

.155640

.173581

.194888

.223730

.262350

.315465

.397376

.534525

.7931651 .4250023.9910566.8519544.3631967.2516085.6268823.3556652.2874471.7023941.3477741.111012.941371.819851.726065.648286.584531.531218.485903.446879.412901.383049.356615.333051.311812.292609.275250.259540.245262.232235.220314.209368

.151323

.167807

.187987

.211933

.244507

.288047

.347886

.436454

.6429671.0993792.0192792.9435133.4642162.3188321.8617942.6504192.8577502.6885652.0950411.6655911.3671331.1526231.001058.877377.778009.696829.629250.572114.523182.480826.443825.411249.382371.356524.333218.312282.293418.276350.260847.246715.233790

.159988

.177716

.199342

.225916

.259008

.304485

.414875

.578522

.8387631.2626871.6611811.9592622.1527981.6439381.2104101.075541.455734.700458.753213.730865.570490

1 .3295031.1568811.011991.895415.799768.719990.652515.594776.544869.501362.463147.429359.399188.372050.347773.325956.306264.288423.272199.257396

.166804

.185218

.207490

.245268

.309158

.397312

.518295

.685970

.9246571.1359291.3174291.4616811 .5237971.240563.846749.812427.752621.9826721.1829131.2721411.3008131.3076521.2840191.126321.997595.891019.801573.725616.660458.604062.554867.511661.473479.439315.408743.381422.356895.334784.314776.296604.280047

.171757

.204745

.248911

.304707

.373534

.465581

.586088

.744837

.8852131.0149561.1383441.1823161.1899121.001572.728743.633170.615268.591509.748086.898757.9843271.0377451.0555721.0551341.042729.969168.872772.790372.719349.657663.603727.556274.514295.476588.443001.412975.386019.361724.339745.319794.301624

.207011

.245792

.293270

.351876

.424791

.512575

.626400

.737588

.848435

.9582271.0324581.0181931 .000322.856584.655750.510207.512782.505683.492953.605307.724283.804671.850571.875050.884260.882604.873253.846227.770913.705193.647510.596616.551291.510747.474588.442228.413153.386929.363197.341647.322020

**1

II

** ISCLT **• Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 16

ANNUAL GROUND LEVEL CONCENTRATION

AXIS (DISTANCE

I

I

I

1

I

I

I

I

I

I

I

I

I

I

I

200.000 100.000

, METERS )

( MICROGRAMS PER CUBIC METER

- GRID SYSTEM RECEPTORS -

- X AXIS (DISTANCE, METERS) -

.000 -100.000 -200.000

- CONCENTRATION -

) DUE TO SOURCE 2 (CONT.) **

-300.000 -400.000 -500.000 -600.000

-2000.000-1900.000

-1800.000-1700.000-1600.000

-1500.000

-1400.000

-1300.000

-1200.000

-1100.000

-1000.000

-900.000

-800.000

-700.000

-600.000

-500.000

-400.000

-300.000

-200.000

-100.000.000

100.000

200.000

300.000

400.000

500.000

600.000

700.000800.000

900.000

1000.000

1100.0001200.0001300.0001400.000

1500.000

1600.000

1700.000

1800.0001900.000

2000.000

.239079

.279800

.328738

.387819

.459378

.546044

.633963

.730254

.831182

.930649

.947910

.917690

.885987

.767012

.606770

.452154

.432289

.434782

.432063

.428186

.514436

.608269

.672669

.714988

.740691

.753935

.757872

.754912

.746877

.735164

.685994

.632548

.584436

.541610

.503344

.469036

.438161

.410283

.385025

.362072

.341154

.265626

.307076

.356018

.413892

.482304

.560102

.644987

.732416

.826148

.912109

.876547

.838896

.801785

.700007

.567431

.437912

.369516

.377148

.382850

.382640

.378791

.445451

.520733

.574950

.612585

.637244

.651817

.658598

.659395

.655637

.648448

.638543

.613610

.569081

.529177

.493308

.460962

.431701

.405154

.380998

.358960

.286961

.328187

.376067

.431623

.498281

.573066

.654367

.740792

.829100

.858892

.817548

.777221

.737859

.649005

.536395

.425420

.324182

.333144

.339554

.342293

.342042

.339335

.392439

.453877

.499625

.532646

.555424

.570024

.578138

.581138

.580138

.575702

.568821

.560265

.550458

.514999

.481506

.451139

.423535

.398379

.375397

.303546

.343838

.389921

.447731

.513566

.585356

.662423

.743352

.825773

.807100

.769775

.729462

.689889

.610944

.513977

.417392

.325808

.294684

.302511

.307341

.309459

.309224

.307025

.350104

.400930

.439752

.468619

.489303

.503317

.511924

.516151

.516516

.514219

.509877

.503961

.496835

.488820

.468583

.440149

.414197

.390440

.315920

.354774

.405303

.463457

.526915

.595373

.668082

.743697

.789948

.757573

.721570

.683491

.645212

.575322

.490518

.406064

.324979

.262513

.271035

.277050

.280688

.282173

.281780

.279803

.315285

.357849

.391023

.416281

.434923

.448082

.456519

.461106

.462793

.462152

.459652

.455678

.450546

.444518

.437800

.428495

.404073

.324637

.369061

.420565

.476734

.537457

.602348

.670642

.741117

.743251

.712397

.678348

.642382

.606037

.543748

.469252

.394760

.322566

.254513

.244103

.250729

.255305

.257960

.258883

.258294

.256427

.286038

.322068

.350622

.372788

.389533

.401401

.409551

.414635

.417197

.417700

.416525

.413999

.410382

.405897

.400735

.395064

.337708

.383443

.433253

.487123

.544867

.606062

.669973

.725347

.699930

.670910

.639049

.605391

.571177

.515392

.449480

.383364

.318809

.257297

.220891

.227766

.232886

.236316

.238181

.238644

.237883

.236083

.261072

.291870

.316567

.335936

.350752

.361827

.369756

.375056

.378164

.379453

.379239

.377789

.375329

.372046

.368149

.351056

.395322

.443173

.494531

.549167

.606642

.666273

.683673

.659749

.632644

.603004

.571669

.539643

.489483

.430834

.371857

.313931

.258246

.205739

.207644

.213044

.216966

.219491

.220735

.220837

.219945

.218205

.239438

.265861

.287297

.304411

.317838

.328118

.335722

.341062

.344490

.346312

.346790

.346147

.344587

.342294

.362058

.404646

.450363

.499092

.550578

.604394

.659894

.644897

.622479

.597259

.569763

.540678

.510811

.465551

.413116

.360283

.308142

.257657

.209617

.189931

.195432

.199647

.202622

.204439

.205204

.205033

.203988

.202151

.220358

.243314

.262166

.277445

.289629

.299145

.306370

.311637

.315234

.317410

.318384

.318372

.317532

I*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 17 ****

W ** ANNUAL GROUND LEVEL CONCENTRATION ( HICROGRAHS PER CUBIC METER

- GRID SYSTEM RECEPTORS -

I - X AXIS (DISTANCE, METERS) -

-700.000 -800.000 -900.000 -1000.000 -1100.000

AXIS (DISTANCE , METERS ) - CONCENTRATION -

) DUE TO SOURCE 2 (CONT.) **

-1200.000 -1300.000 -1400.000 -1500.000

§

I

I

I

I

I

I

§

I

I

I

I

I

I

I

I

-2000.000-1900.000

1 -1800.000| -1700.000-1600.000

1 -1500.000, -UOO.OOO-1300.000

f - 1200.000-1100.000-1000.000-900.000

1 -800.0001 -700.000

-600.000

1 -500.000-400.000-300.000

I~ -200.000-100.000

.000100.000

I 200. 000300.000400.000

I 500. 000600.000700.000

1 800.0001 900.000* 1000.000

1100.000

1 1200.0001300.0001400.000

( 1500.0001600.0001700.000

. 1800.0001 1900.000•' 2000.000

.370753

.411512

.454996

.501055

.549422

.599696

.627014

.608854

.587909

.564484

.539011

.512049

.484262

.443293

.396222

.348714

.301646

.255803

.211845

.174261

.179753

.184119

.187388

.189616

.190884

.191234

.190734

.189567

. 187857

.203654

.223772

.240469

.254165

.265241

.274040

.280867

.285992

.289650

.292054

.293424

.293890

.376949

.416102

.457319

.500725

.546063

.592959

.592469

.575380

.555837

.534089

.510498

.485518

.459690

.422508

.380093

.337229

.294625

.252925

.212684

.174352

.165749

.170168

.173616

.176133

.177735

.178455

.178469

.177868

.176734

.175154

.188964

.206710

.221578

.233903

.243995

.252129

.258557

.263497

.267168

.269745

.271377

.380977

.418049

.457220

.498272

.540856

.574099

.560353

.544302

.526074

.505881

.484024

.460879

.436877

.403051

.364697

.325901

.287237

.249238

.212369

.177022

.153206

.157623

.161123

.163781

.165609

.166708

.167151

.167010

.166358

.165266

.163796

.175958

.191703

.205007

.216141

.225357

.232881

.238923

.243687

.247329

.249991

.383291

.418322

.455144

.493600

.533439

.543200

.530537

.515446

.498439

.479680

.459415

.437957

.415661

.384802

.350012

.314793

.279617

.244924

.211110

.178509

.147339

.146172

.149716

.152488

.154542

.155930

.156710

.156943

.156691

.156012

.154964

.153598

.164370

.178416

.190376

.200470

.208911

.215891

.221589

.226154

.229722

.384116

.417171

.451754

.487708

.524305

.514100

.502133

.488311

.472712

.455334

.436530

.416623

.395912

.367685

.336031

.303968

.271884

.240133

.209039

.178913

.149997

.135828

.139364

.142222

.144433

.146037

.147082

.147616

.147692

.147361

.146670

.145670

.144400

.153990

.166584

.177385

.186577

.194341

.200832

.206192

.210550

.383662

.414820

.447281

.480900

.496923

.487197

.475797

.462755

.448142

.432074

.414710

.396226

.376899

.351058

.322251

.293038

.263751

.234700

.206172

.178420

.151656

.126471

.129976

.132874

.135189

.136951

.138200

.138975

.139320

.139277

.138891

.138202

.137248

.136066

.144656

.156008

.165806

.174212

.181369

.187407

.192447

.382121

.411474

.441938

.473358

.471694

.462340

.451494

.439188

.425491

.410500

.394351

.377211

.359279

.335568

.309246

.282552

.255757

.229124

.202897

.177291

.152497

.128667

.121447

.124349

.126725

.128600

.130003

. 130968

.131532

.131730

.131600

.131178

.130497

.129597

.128506

.136241

.146515

.155440

.163148

.169759

.175383

.379666

.407310

.435898

.455958

.448317

.439339

.429027

.417417

.404567

.390563

.375521

.359583

.342918

.321116

.296998

.272534

.247955

.223480

.199318

.175658

.152664

.130474

.113683

.116559

.118965

.120916

.122434

.123548

.124288

.124684

.124769

.124574

.124135- .123480.122638.121631.128621.137959.146115.153202.159321

.376450

.402480

.429320

.434026

.426626

.418022

.408226

.397267

.385200

.372100

.358069

.343227

.327711

.307615

.285456

.262977

.240370

.217827

.195524

.173625

.152275

.131599

.111696

.109430

.111841

.113837

.115438

.116667

.117547

.118106

.118372

.118374

.118142

.117701

.117074

.116282

.115352

.121694

.130211

.137688

.144221

'*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 18 ••.

§9 ** ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAMS PER CUBICMETER ) DUE TO SOURCE 2 (CONT.) **

- GRID SYSTEM RECEPTORS -

1' AXIS (DISTANCE

1̂ -2000.000

-1900.000

1 -1800.000

9 -1700.000

-1600.000

1 -1500.000-1400.000

" -1300.000

1 -1200.000

-1100.000

-1000.000

-900.000

• -800.000

9 -700.000

-600.000

1 -500.000

-400.000-300.000

1- -200.000

-100.000

.000100.000

1 200.000

300.000

400.000

§ 500.000

600.000

700.000^ 800.000

• 900.000™ 1000.000

1100.000

1 1200.000

1300.000

1400.000

1 1500.000

1600.000

1700.000

— 1800.000

• 1900.000

"' 2000.000

1

1

1

-1600.000 -1700.000

. METERS

.372607

.397120

.419704

.413626

.406473

.398238

.388931

.378583

.367241

.354972

.341862

.328017

.313555

.294981

.274569

.253860

.233019

.212209

.191583

.171282

.151434

.132150

.113522

.102893

.105290

.107310

.108968

.110282

.111274

.111966

.112384

.112557

.112503

.112245

.111805

.111205

.110462

.109596

.115377

.123168

.130042

- X

-1800.000

AXIS (DISTANCE,-1900.000

METERS) -

-2000.000

) - CONCENTRATION -

.368251

.391343

.400548

.394623

.387724

.379848

.371007

.361229

.350558

.339051

.326785

.313847

.300339

.283147

.264296

.245171

.225913

.206662

.187550

.168700

.150223

.132221

.114777

.097960

.099257

.101283

.102976

.104354

.105435

.106239

.106787

.107099

.107195

.107095

.106820

.106386

.105812

.105115

.104311

.109592

.116743

.363485

.385248

.382661

.376903

.370256

.362726

.354327

.345082

.335032

.324227

.312733

.300629

.288000

.272039

.254592

.236890

.219057

.201211

.183469

.165938

.148717

.131894

.115547

.099739

.093693

.095710

.097428

.098854

.100005

.100897

.101549

.101977

.102200

.102237

.102103

.101816

.101391

.100843

.100187

.099434

.104279

.358367

.370738

.365948

.360355

.353961

.346765

.338783

.330036

.320560

.310401

.299616

.288272

.276447

.261604

.245419

.228999

.212450

.195875

.179376

.163046

.146974

.131237

.115904

.101040

.088564

.090567

.092291

.093746

.094948

.095908

.096643

.097169

.097500

.097652

.097642

.097482

.097189

.096774

.096252

.095635

.094932

.353008

.354959

.350276

.344872

.338739

.331863

.324273

.315991

.307048

.297484

.287351

.276705

.265615

.251788

.236741

.221479

.206092

.190669

.175299

.160065

.145044

.130310

.115925

.101940

.088404

.085804

.087523

.088996

.090233

.091246

.092049

.092654

.093075

.093327

.093422

.093374

.093196

.092900

.092497

.092000

.091419

IX Y CONCENTRATION

DISTANCE DISTANCE

TERS) (METERS )

I**4

I

IOIS

I

I

I

I

iiiiiiiiiiii

ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 19 ****

ANNUAL GROUND LEVEL CONCENTRATION ( HICROGRAMS PER CUBIC METER

- DISCRETE RECEPTORS -

X Y CONCENTRATIONDISTANCE DISTANCE

(METERS) (METERS )

) DUE TO SOURCE 2 (CONT.) **

X Y CONCENTRATION

DISTANCE DISTANCE

(METERS) (METERS )

I U.3 -26.9 .347483 1600.1 2811948.7 -23.5 .735773 1948.7 -667

564.5 -1265.0 .700100 542.8 -1184I 58.2 -402.0 .347194

.3 .632917

.4 1.008099

.0 .949030

- PROGRAM DETERMINED MAXIMUM 10

X

COORDINATE

(METERS)

900.00

1000.00

1000.00

1100.00800.00

1100.00800.00

900.00

800.00

1200.00

1725.8 -23.51430.6 -983.6

211.2 -1134.5

VALUES -

.891855

.886668

.898946

Y CONCENTRATION

COORDINATE

(METERS )

-700.00

-800.00

-700.00

-800.00

-600.00

-700.00-800.00

-600.00

-500.00

-800.00

16.453690

12.88177012.088700

7.9012487.251608

6.8530706.851954

6.338300

5.626882

4.911354

**

II

** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 20 ****

- SOURCE INPUT DATA -

SOURCE SOURCE X Y EMISSION BASE /•NUMBER TYPE COORDINATE COORDINATE HEIGHT ELEV- / - SOURCE DETAILS DEPENDING ON TYPE -P (M) (M) (M) ATION /

§ a.L'.3 AREA 918.16 -782.92 5.18 .00 WIDTH OF AREA (M)= 36.58

I - SOURCE STRENGTHS ( GRAMS PER SEC PER SQUARE METER )

SEASON 1 SEASON 2 SEASON 3 SEASON 47.A7330E-04

I

I

iiiiiiiiiiii

I'** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 21 ****

I'* ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAHS PER CUBIC METER

- GRID SYSTEM RECEPTORS -

I - X AXIS (DISTANCE, METERS) -

2000.000 1900.000 1800.000 1700.000 1600.000

AXIS (DISTANCE . METERS ) - CONCENTRATION -

) DUE TO SOURCE 3

1500.000 1400.000 1300.000

III

1200.000

-2000.000

— -1900.000• -1800.000P -1700.000

-1600.000

1-1500.000-1400.000-1300.000

1 -1200.000-1100.000-1000.000

_ -900.000• -800.000P -700.000

-600.000

1 -500.000-400.000-300.000

1 -200.000-100.000

.000100.000

• 200.000™ 300.000

400.000

1 500.000600.000700.000

1 800.000900.000

- 1000.0001100.000

1 1200.000• 1300.000

1400.000

1 1500.0001600.0001700.000

11800.0001900.0002000.000

.244902

.259883

.290097

.311387

.345584

.382406

.421312

.461373

.625230

.8231531.0598581.2990431.5457201 .6660431.6076311.525373.424990.472894.490261.521883.524975.506912.473784.477595.264275.1240901.001682.894791.801365.719593.648907.587211.532757.484576.441837.403826.369935.339703.321339.286527.270484

.265990

.284792

.303951

.342558

.370141

.414721

.462824

.513437

.587853

.8745041.1726181.4772061.7916501.9440561.8641781.7524781.6643401.7108031.7696441.7840411.7659931.7253501.7297821.4586141.2827201.1311241.000419.887588.789995.705376.632171.569191.514248.465938 "".423334.390641.358159.322880.304727.288069.272754

.288385

.311684

.336248

.361393

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.640993

.9498911.3131791.7145162.1291712.3263052.2129472.0513782.1424892.0825142.1185122.1037482.0534792.0593261.7056001.4802471.2890321.126678.988577.870792.770013.683482.608902.545459.490559.455270.401196.369215.346630.326073.307315.290159.274431

.311833

.340338

.371346

.404413

.438495

.506967

.557901

.644096

.738376

.9824131.4713582.0137952.5773842.8390562.6718232.4357782.5026902.5783802.5625312.4942482.5015672.0269981.7308961 .4844491.2790811.107489.963583.842383.739838.652659.583716.530096.459320.427435.398777.372939.349575.328386.309115.291539.275469

.335932

.370336

.408868

.451520

.497735

.546193

.646430

.725679

.854083

.9917421.6473862.3964743.1920083.5513093.2913493.3593463.2178503.2291783.1329003.1267142.4574172.0560801.7301521 .4648301.2479701.069799.922572.800166.717753.618430.545646.502401.464968.431784.402100.375450.351441.329737.310055.292150.275817

.360095

.401001

.448082

.502021

.563156

.634214

.711900

.865434

.9883791.1889041.9344832.8993954.0809084.5960444.1677014.2697144.2058954.0847034.0732373.0773222.4944012.0444361.6930751.4137591.1900491.013404.904547.732813.664284.604907.553170.507857.468633.434395.403902.376624.352128.330046.310071.291941.275433

.362886

.443832

.492311

.554565

.634830

.733483

.847889

.9744011.2260601.4348111.7702393.5468715.4114446.1859025.9160175.7498715.6066135.5636133.9951573.1239722.4696841.9761081.6073161.3606851.129673.929993.830109.745513.673318.611262.557562.510796.470079.435091.404039.376349.351548.329244.309109.290866.274281

.353516

.411119

.484121

.598741

.733363

.8394871.0005471.1976961.4284251 .8876392.2730894.6185987.5261248.7595659.2274438.2232228.1750925.4504704.0314713.0466942.3427381 .9490911.4559281.2276231.072973.945991.840575.752169.677327.613426.558433.510762.469168.433712.402392.374530.349627.327271.307119.288886.272330

.338117

.393895

.465150

.558412

.688210

.8720241.2402911.4527351.8314002.3125593.2823185.18490311.13775013.23076013.10897013.1893907.9136125.4354283.9455882.9556222.0759571.7209171.4509721.2467671.083624.951286.842467.751896.675690.610944.555450.507508.465794.430131.398862.371093.346306.324081.304068.285974.269557

I***

IISCLT ****** Aicoa Davenport Uorks - Water Reclamation Faclility Modeling - 1991 PAGE 22 **

** ANNUAL GROUND LEVEL CONCENTRATION ( HICROGRAHS PER CUBIC METER

- GRID SYSTEM RECEPTORS -

I - X AXIS (DISTANCE, METERS) -

1100.000 1000.000 900.000 800.000 700.000

AXIS (DISTANCE , METERS ) - CONCENTRATION -

) DUE TO SOURCE

600.000 500.000

3 (CONT.)

400.000

III

300.000

I

1•11•

1•

.

.1•

.

•

-2000.000

-1900.000-1800.000

-1700.000-1600.000-1500.000-1400.000

-1300.000

-1200.000-1100.000

-1000.000

-900.000

-800.000

-700.000

-600.000-500.000-400.000-300.000

-200.000-100.000

.000100.000200.000

300.000400.000

500.000

600.000700.000800.000

900.0001000.000

1100.000

1200.0001300.000

1400.000

1500.0001600.000

1700.000

1800.000

1900.0002000.000

1123

.316272

.368034

.434365

.522798

.645750

.818348

.071274

.461632

.278652

.277508

4.376148

718292412843221111

.021654

.413460

.500100

.361870

.352850

.274857

.968714

.406414

.646921

.123911

.742561

.456487

.245088

.078418

.944320

.834742

.743982

.667907

.603465

.548364

.500851

.459575

.424258

.393384

.365987

.341548

.319647

.299931

.282113

.265950

.287869

.333276

.391204

.468613

.575552

.725509

.946141

1.290922

1.8655152.917293

5.366680

12.305260

35.321330

52.326750

24.09869010.1410906.6633064.6655533.4392182.639216

2.1008511.7156621.429857

1.219794

1.055638.924010

.816701

.727961

.653661

.590771

.537022

.490684

.450431

.416105

.385925

.359187

.335338

.313955

.294704

.277299

.261504

.272063

.313128

.364989

.433423

.526813

.655486

.8416911.126169

1.583603

2.379740

3.923756

10.632040

49.099620

53.613620

29.67334015.811150

9.7023036.4719364.598807

3.4283422.6641342.133334

1.748687

1.469915

1.256732

1.088373.952974

.842346

.750728

.673925

.608863

.553230

.505270

.464504

.428915

.397610

.369837

.345071

.322870

.302894

.284843

.288011

.332143

.387880

.461184

.561184

.698343

.8945781.190444

1 .6539853.632765

6.430189

20.711570

37.067530

17.398580

18.73531016.75850012.8777708.259121

5.8559194.339400

3.3486092.658539

2.160390

1.801531

1.527570

1.312648

1.1409501.001601.886933

.791422

.711002

.642633

.584010

.534151

.491176

.453465

.420160

.390590

.364206

.340557

.319271

.301536

.347648

.405609

.480408

.582362

.7201261.032738

1.679671

2.525608

4.07478810.054340

17.490730

20.848650

10.712400

6.0279278.8466448.3532447.482688

6.8679795.006545

3.8671763.0767612.503356

2.0864751.765197

1.5127481.3109841.1473051.012760.900859.806808

.727012

.658734

.600854

.550996

.507325

.468846

.434763

.404422

.377288

.352922

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.414454

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.9644911.337368

1.9141212.787135

5.751431

9.05420115.380350

13.310910

7.491467

4.5567253.6297265.0027454.9787454.7162404.336169

4.0314983.428374

2.765246

2.311739

1.959014

1.680008

1.4559401.2735431.123247

.998047

.892713

.803301

.726783

.662247

.606335

.557387

.514294

.476155

.442238

.411937

.384754

.314028

.375830

.512544

.638855

.8377061.112794

1.493359

2.0248783.694614

5.4610617.969250

9.883485

9.095538

5.617691

3.7799412.557370

2.4103813.1871183.2726493.225667

3.0700452.871209

2.693822

2.5394912.108904

1.813886

1.5751431.3796151.217749

1.082409.968213

.871063

.788088

.717957

.656887

.603394

.556281

.514577

.477487

.444358

.414643

.383108

.468225

.585348

.736464

.9331461.1978531.549941

2.5832753.619971

5.070331

7.319366

7.194423

6.574872

4.342402

2.9406191.8544791 .8230201.722400

2.2148512.317788

2.3350422.2812122.195274

2.089214

1.975522

1 .898772

1.6815631.4656491.296194

1.153784

1.033111.930090

.842621

.767765

.702460

.645168

.594648

.549886

.510046

.474438

.442488

.436486

.531171

.649696

.798976

.9879991.2286841 .919235

2.588962

3.495932

4.5922865.750165

5.445885

4.968001

3.451521

2.5083281.823964

1.4035781 .372400

1 .3033591 .6345951.7278491.775709

1.7689581.728864

1.669669

1.600418

1.5268081.4636111 .378465

1.2123991.087497

.980460

.890045

.811587

.742954

.682611

.629302

.581992

.539827

.502101

.468219

III

ISCLT ************* Alcoa Davenport Uorks - Water Reclamation Faclil ity Modeling - 1991

ANNUAL GROUND LEVEL CONCENTRATION

AXIS (DISTANCE

200.000 100.000

, METERS )

( MICROGRAMS PER CUBIC METER

- GRID SYSTEM RECEPTORS -

- X AXIS (DISTANCE. METERS) -

.000 -100.000 -200.000

- CONCENTRATION -

) DUE TO SOURCE

-300.000 -400.000

PAGE 23

3 (CONT.) **

-500.000 -600.000

-2000.000_ -1900.000• -1800.000~ -1700.000

-1600.000

1-1500. 000-1400.000-1300.000

1 -1200.000-1100.000-1000.000

_ -900.000• -800.000* -700.000

-600.000

1 -500.000-400.000-300.000

1 -200.000-100.000

.000100.000

• 200.000•' 300.000

400.000

1 500.000600.000700.000

1 800.000900.0001000.0001100.000

• 1200.000• 1300.000

1400.000

1 1500.0001600.0001700.000

1 1800.0001900.0002000.000

.480816

.575279

.691230

.8340851.0105251 .4930261 .9453772.5541113.2824344.2222914.4808174.2796133.9035502.8228292.1556031.5041771.1002571.1041311.0742401.0262131.2657711 .3500941.4004591.4106221.3947331 .3623911 .3200821.2721601.2215601.1701771.1394671.026174.930449.849454.778374.715705.660207.610853.566788.527301.491790

.512055

.603948

.714727

.8484931.2049251.5299031.9542642.4547473.0393563.8257573.6404613.4582723.1613912.3592711.8679061.3750411.015000.898028.893232.871847.838754.016749.086455.133459.150874.148003.131445.105881.074611.039956.003539.968506.942094.889008.808804.744499.687386.636479.590925.550027.513184

.532480

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.724328

.9957741.2389021.5517831.9165752.3355312.8072083.0977243.0143162.8547422.6171272.0042711.6314331.254878.936960.742428.751625.744626.726394.700855.836948.894712.936917.956933.961062.953948.939005.918725.895500.871579.846404.820532.795474.779173.710927.658912.612263.570292.532408

.544143

.626876

.8388841.0260141.2638151.5381951.8511642.2028832.7142702.6344232.5497702.4082482.2145431.7343211 .4433261.148655.861285.646917.637529.639566.631431.616109.595983.702647.750815.788113.808468.816269.814852.806742.795061.780683.763892.745497.726097.706148.685996.672285.633979.588143.549492

.548839

.718102

.8653661.0506921.2625271.5024991.7712472.0679112.3223682.2681422.1883032.0662841 .9065381.5210571.2885601.052314.819915.648079.545032.552600.551233.543181.530324.514182.599506.640002.672765.692374.701965.704202.702202.695920.686458.674680.661245.646675.631368.615627.599701.585710.569835

.622892

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.642653

.762138

.896560

.046904

.213833

.397512

.597434

.827339

.776776

.733552

.6667401.5753751 .4629811.2023921.046473.887414.729119.575089.464712.419956.425927.426555.422980.416189.407014.396140.453509.482991.508759.526790.538359.544742.547012.546035.542515.537015.529994.521819.512786.503214.493883

.661724

.771557

.8936991.0287141.1768731 .3380301.5153571.6013401.5771031.5354031 .4750361 .3954721.2997701.081251.950958.817894.684947.554756.439389.369260.377015.380083.379350.375604.369528.361699.352755.401393.427205.450337.466869.478039.484863.488181.488679.486922.483372.478408.472341.465777.458891

.671555

.772221

.8830211.0042441.1359151.2777131.4815371 .4347831 .4094901 .3700231.3156241.2460001.163783.978547.868422.755883.643100.532083.424590.345100.335233.339939.341243.339777.336096.330813.324645.317548.358807.381378.401864.416941.427561.434515.438466.439966.439471.437362.433953.430074.425472

III

I'*"* ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 24

I'* ANNUAL GROUND LEVEL CONCENTRATION ( HICROGRAHS PER CUBIC METER

- GRID SYSTEM RECEPTORS -

I - X AXIS (DISTANCE, METERS) -

-700.000 -800.000 -900.000 -1000.000 -1100.000

AXIS (DISTANCE , METERS ) - CONCENTRATION -

) DUE TO SOURCE 3 (CONT.) **

-1200.000 -1300.000 -1400.000 -1500.000

-2000.000_ -1900.000

• -1800.000

™ -1700.000

-1600.000

1-1500.000

-1400.000-1300.000

1 -1200.000-1100.000

-1000.000

— -900.000

• -800.000

* -700.000

-600.000

1 -500.000

-400.000

-300.000

1 -200.000

-100.000

.000

100.000

• 200.000

• 300.000

400.000

1 500.000

600.000

700.000

1 800.000

900.0001000.000

1100.000• 1200.000

• 1300.000

1400.000

1 1500.000

1600.000

1700.000

1 1800.000

1900.000

~ 2000.000

.675080

.766405

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1.0930021.2181701.3077121.2928371.2675111.2305981.181597

1.120365

1.049203

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1.0495281.185566.186708.170993.146262.111969.067799

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1.0819181.0657021.0419231.010198.970317.922278.867804

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.159470

.157589

.155535

.169048

.177427

.185796

.192885

III

1'** ISCLT ************* Alcoa Davenport Works - Water Reclamation Facli lity Modeling - 1991 ******** PAGE 25 **.*

* ** ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAMS PER CUBIC METER ) DUE TO SOURCE 3 (CONT.) **- GRID SYSTEM RECEPTORS -

1AXIS (DISTANCE

-2000.000_ -1900.000• -1800.000™ -1700.000

-1600.000

1-1500.000-1400.000-1300.000

1 -1200.000-1100.000-1000.000

_ -900.000• -800.000• -700.000

-600.000

1 -500.000-400.000-300.000

1 -200.000-100.000

.000100.000

• 200.000™ 300.000

400.000

1 500.000600.000700.000

1 800.000900.0001000.0001100.000

• 1200.000• 1300.000

1400.000

1 1500.0001600.0001700.000

1 1800.0001900.000

' 2000.000

1

1

1

-1600.000 -1700.000, METERS

.582721

.625348

.674527

.663629

.657057

.648192

.636930

.623192

.606934

.588137

.566819

.543038

.517567

.463863

.432414

.400333

.367871

.335267

.302754

.270552

.238862

.207867

.177723

.155852

.148578

.151147

.153023

.154274

.154965

.155191

.155110

.154652

.153863

.152788

.151466

.149933

.148222

.146363

.158616

.166272

.173960

- X-1800.000

AXIS (DISTANCE,-1900.000

METERS) --2000.000

) - CONCENTRATION -

.567934

.607355

.628249

.623492

.616796

.608063

.597213

.584188

.568950

.551494

.531841

.510038

.486786

.437961

.409401

.380278

.350803

.321177

.291597

.262255

.233320

.204952

.177291

.153087

.138460

.141117

.143139

.144633

.145611

.146204

.146391

.146218

.145726

.144954

.143938

.142712

.141305

.139746

.138056

.149207

.156226

.553610

.602156

.591914

.586927

.580199

.571657

.561238

.548898

.534612

.518378

.500219

.480177

.458885

.414344

.388317

.361788

.334932

.307922

.280928

.254110

.227618

.201590

.176148

.151398

.132850

.132059

.134238

.135878

.137094

.137886

.138295

.138360

.138120

.137610

.136860

.135903

.134765

.133471

.132043

.130505

.140686

.540011

.563947

.559228

.553680

.546837

.538527

.528546

.516863

.503462

.488343

.471528

.453057

.433506

.392742

.368944

.344699

.320152

.295452

.270743

.246164

.221845

.197907

.174503

.151712

.134165

.123865

.126098

.127880

.129228

.130180

.130771

.131037

.131012

.130725

.130207

.129484

.128582

.127524

.126331

.125021

.123616

.532668

.533909

.529568

.523923

.516925

.508527

.498749

.487692

.475110

.461008

.445407

.428342

.410343

.372918

.351100

.328875

.306371

.283716

.261035 '

.238453

.216126

.194122

.172534

.151447

.130935

.116371

.118657

.120508

.121956

.123035

.123775

.124209

.124364

.124270

.123952

.123434

.122740

.121891

.120906

.119803

.118614

'*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991

X Y CONCENTRATION

DISTANCE DISTANCE

ETERS) (METERS )

I'*«

II01

IIIIIIIIIIIIIIII

******** PAGE 26

ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAMS PER CUBIC METER ) DUE TO SOURCE 3 (CONT.) **

14.3

1948.7

564.5

58.2

-26.9-23.5

-1265.0

-402.0

.747584

1.6471292.227594

1.018119

- DISCRETE RECEPTORS -

X Y CONCENTRATION X Y CONCENTRATION

DISTANCE DISTANCE DISTANCE DISTANCE

(METERS) (METERS ) (METERS) (METERS )

1600.1

1948.7

542.8

281.3-667.4

-1184.0

1.510460

1.780583

3.550990

1725.8

1430.6

211.2

- PROGRAM DETERMINED MAXIMUM 10 VALUES -

X Y CONCENTRATION

COORDINATE COORDINATE

(METERS) (METERS )

900.00

1000.00

900.00

800.00

1000.00

900.00

1100.00

1100.00

1000.00

700.00

-700.00

-700.00

-800.00

-800.00

-800.00

-600.00

-700.00

-600.00

-600.00

-800.00

53.61362052.326750

49.099620

37.067530

35.321330

29.673340

29.500100

24.361870

24.098690

20.848650

-23.5-983.6

-1134.5

2.339638

2.194395

3.865016

I:**

I

I

ISCLT Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE

ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAHS PER CUBIC METER- GRID SYSTEM RECEPTORS -

- X AXIS (DISTANCE, METERS) -

2000.000 1900.000 1800.000 1700.000 1600.000

AXIS (DISTANCE . METERS ) - CONCENTRATION -

) FROM ALL SOURCES COMBINED

1500.000 1400.000 1300.000

III

27

1200.000

-2000.000

— -1900.000• -1800.000• -1700.000

-1600.000

1-1500.000

-1400.000

-1300.000

1 -1200.000

-1100.000

-1000.000

_ -900.000

• -800.000

^ -700.000-600.000

1 -500.000

-400.000

-300.000

1 -200.000

-100.000

.000

100.000

• 200.000

• 300.000

400.000

1 500.000600.000

700.000

1 800.000

900.0001000.000

1100.000• 1200.000

• 1300.0001400.000

1 1500.0001600.0001700.000

1 1800.0001900.0002000.000

.582756

.610883

.672086

.737066

.820103

.911120

1 .0095361.1140531.403849

1.9159322.488192

3.0725013.6598913.7802913.5657233.3156703.0429142.948743

2.9821013.022248

3.0262823.001954

2.956054

2.941455

2.6207582.3534522.1181451.9109371.728642

1.5673641 .425424

1.2996131.1878111.088212.999260.919610.848115.783844.734587

.673821

.642340

.630064

.665618

.700467

.777680

.860752

.968134

1.086646

1.2127521.3706511 .9935322.7052733.4397634.180366

4.3264704.044031

3.714679

3.406213

3.3650053.429282

3.441111

3.4127623.354764

3.3357302.936735

2.6113662.3285172.0824691.8681021.680921

1.5172931 .3737251.2476741.1364061.037835.950250.877190.808367.748361.712246.678672.647429

.680614

.725001

.770151

.814349

.9140321.022648

1.164946

1 .3228901.494182

2.0659402.943606

3.8892444.847443

5.026499

4.644742

4.196515

4.0117493.943607

3.969146

3.9355093.8592963.833117

3.3242872.9206812.5751612.2790562.0247231.8056021.616154

1.4517421 .308626

1.1840061.074638.990873.893987.839474.795784.755422.718082.683484.651375

.734056

.788805

.846404

.905413

.9631751.096060

1.2441121 .4397561.6618932.0571623.2020104.4561925.738396

5.9677245.4179534.7845284.622946

4.671340

4.625268

4.518992

4.4789033.811154.

3.298446

2.867960

2.5058572.2002631.9412521.7206751.531891

1 .3694911.234619

1.1227811.009585.950845.897086.847799.802530.760867.722448.686950.654093

.789768

.856447

.928832

.006091

.086145

.164845

.349995

.562058

.8555032.1830813.4451465.1520286.9319167.2351576.4330125.944864

5.6471805.589516

5.424473

5.358105

4.441904

3.770612

3.2208582.769334

2.3966412.087139.828417.610671.446174

.275709

.164524

.089696

.022075

.960784

.904944

.853973

.807333

.764551

.725216

.688968

.655495

.846786

.9268891.016429

1.115665

1.2237861 .337900

1.450259

1.7316092.0622392.5134903.7138506.0193008.617158

9.033455

7.794537

7.2366037.034086

6.771486

6.6277465.301944

4.379093

3.654010

3.077311

2.614772

2.240487

1.938761

1.7249221.4750111.365516

1.2678101.180319

1.1017091.031275.967782.910174.857794.810025.766339.726279.689451.655509

.876002

1.011004

1.111878

1.2322731.3737171.535070

1.715542

1.9019812.350787

2.894310

3.619697

7.014667

11.023380

11.647840

10.128940

9.3383268.9092738.6156816.554244

5.211452

4.200871

3.4389522.8523912.432275

2.061260

1.785299

1.6341431.5019091.385594

1.2827421.191345

1.1097451.036811.971551.912545.859078

.810463

.766117

.725544

.688319

.654074

.832231

.9623171.1273281.344178

1.5586091.756618

2.021168

2.3279192.656418

3.4481854.4294188.38955414.90145015.83966014.244130

12.65882012.044750

8.5092836.402334

4.9260543.8667643.215704

2.5367842.234404

2.0117551.8226701.6606211.5205591.398553

1.2915311.197049

1.1131531.038269.971840.911866

.857676

.808526

.763790

.722937

.685516

.651140

.773358

.8939041.0479511.2479721.5211641.903817

2.4344812.8321693.4317104.1071885.749591

8.94383721.53601023.000370

19.917380

18.708890

11.856660

8.206251

5.991646

4.5333993.414944

2.944549

2.582885

2.2897742.048309

1.8465591.6758411.5297631.403547

1.293553

1 . 196972

1.1115961.035674.968458.907987.853476.804130.759291.718404.680998

.646676

I'*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 PAGE

I ** ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAMS PER CUBIC METER- GRID SYSTEM RECEPTORS -

I - X AXIS (DISTANCE, METERS) -1100.000 1000.000 900.000 800.000 700.000

AXIS (DISTANCE , METERS ) - CONCENTRATION -

) FROM ALL SOURCES COMBINED (CONT.)

600.000 500.000 400.000

III

300.000

11•

1•

I•

1•

1•

-2000.000-1900.000-1800.000-1700.000-1600.000-1500.000-UOO.OOO-1300.000-1200.000-1100.000-1000.000-900.000-800.000-700.000-600.000-500.000-400.000-300.000-200.000-100.000

.000100.000200.000300.000400.000500.000600.000700.000800.000900.0001000.0001100.0001200.0001300.0001400.0001500.0001600.0001700.0001800.0001900.0002000.000

.1.1.1.2.3.4.5.7.12.34.44.34.18.11.7.5.4.3.3.2.2.2....

.

.

.

.

.

.

.

.

699225804951940269117092360883703943210423012334375409935906538425076860484150178780150990031960673130179574273254281965569865035967635105320518065359854807678365528551399899

288342190787104836028618961233900818846408797222752583711917674748640668

.610584

.696299

.805020

.9461741.1405721.4134431.8165082.4658443.6063585.85940811.15208020.49989062.32995079.90488033.87376014.89980010.1160907.3124125.5743254.4311363.6453303.0715322.6478472.3223642.0603291.8458331.6672081.5162861.3872011.2756301.1783161.0927601.017026.950234.890326.836451.787795.743662.703480.666770.633119

.529897

.595786

.677461

.780864

.9205921.1099741.3773361.7836762.4401403.5994355.86323714.29344056.88860088.84698042.61245022.63024014.0112709.5524286.9783305.3683954.3018963.5498513.0099142.6001202.2801032.0226341.8114571.6353781.486725

1.3596991.2497921.1542771.070159.996419.930802.872381.819631.772081.728959.689632.653782

.569454

.642887

.734370

.8501021.0075121.2214881.5233021 .9816002.7164655.2065709.26320529.34055054.22542027.70175034.59748028.97782020.09693013.1638009.4770557.1858685.6792574.6227203.8682943.3043612.8642862.5139242.2295421.9948701.7984731.6320821.4896121.3664771.2591791.1657031.0833061.010022.944570.885828.832865.784920.741348

.603683

.682656

.780826

.9033031.0700981.2944681.7260462.5487193.8257316.35571514.33417024.00167028.65504015.88392010.06950014.52509014.56388013.38065011.4427708.6083496.7987475.5419154.6257243.9351433.3957102.9662472.6180992.3314322.092171

1.8901131.7176891.5692011.4405361.3286661.2302701.1431271.065566.996196.933863.877618.826670

.629529

.711351

.812327

.9385951.2259041.5712742.1817613.1169054.5607608.46404512.72784019.85258018.07022011.0837807.1481935.9597448.1586778.6853028.5426798.1032477.4434026.3158065.2460014.4670813.8545203.3639372.9646782.6351322.359732

2.127045.928520.757666.609876.481751.368845.269058.180394.101223.030211.966247.908407

.647073

.745588

.9266921.1308021.4678531 .9344892.5814723.4865905.6919628.00113111.04024013.31326012.5120508.3513995.5887894.3146964.0485095.3186255.8429125.9852705.8834775.6993705.4631784.9543314.2341893.7013533.2645552.9020592.5979312.3402332.1199211 .9301631; 7661 561.623625.497966.386925.288292.200263.121352.050325.986150

.726048

.8803611.0923881.3645131.7145422.1799342.7979054.1875475.5875187.41232410.0463709.9801829.2869626.5814854.5303543.2149153.1551013.0066783.8300814.2594824.4688484.5195944.4639834.3484174.1997703.9598803.5280933.1301342.804844

2.5279622.2904052.085804.908507.753382.616813.496014.388646.292781.2068261.1294521.059546

.8575661.0356331.2570801.5344611.8841672.3232533.2656564.2105345.4194366.8356858.2326527.8359997.2412735.3669153.9488102.9130622.5052662.4628132.3682762.9376033.2928693.5058613.5922433.5982903.5522623.4731613.3737523.2501382.999259

2.6894662.4391772.2230112.0354241 .8703841.7247991.595808.480994.378367.286264.203301.128306

IT** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 29 ****

I** ANNUAL GROUND LEVEL CONCENTRATION ( HICROGRAMS PER CUBIC METER

- GRID SYSTEM RECEPTORS -

I - X AXIS (DISTANCE, METERS) -

200.000 100.000 .000 -100.000 -200.000

AXIS (DISTANCE , METERS ) - CONCENTRATION -

) FROM ALL SOURCES COMBINED (CONT.)

-300.000 -400.000 -500.000

III

-600.000

-2000.000

_ -1900.000

• -1800.000

™ -1700.000

-1600.000

1-1500.000

-KOO.OOO

-1300.000

1 -1200.000-1100.000

-1000.000_ -900.000

• -800.000

™ -700.000

-600.000

1 -500.000

-400.000

-300.000

1 -200.000

-100.000

.000

_ 100.000

• 200.000

™ 300.000

400.000

1 500.000

600.000

700.000

1 800.000

900.000

1000.000

1100.000

• 1200.000

• 1300.000

1400.000

1 1500.0001600.000

1700.000

1 1800.000

1900.000

2000.000

.973168

1.1556801 .3782421 .6508051 .9855842.6613893.3317034.1824545.1824726.404871

6.7178546.406837

5.905410

4.532981

3.490091

2.477112

2.022587

2.036175

2.0046591.948948

2.3683462.6528562.838004

2.934291

2.968365

2.9592512.920506

2.861809

2.790083

2.710255

2.5748862.3460272.1469481.974294

1.8215971.6859801.5650291 .4567361 .359408

1.2716361.192216

1 .062994

1.2447931 .462478

1.7235922.2317172.7405223.3741354.1005534.9318195.9518555.6753465.378888

4.959763

3.912814

3.1142522.322160.802957.708222

.714344

.692269

.650081

1 .965970

2.195245

2.3552162.4493152.495081

2.5056202.490722

2.457679

2.411911

2.3584602.3004832.2211372.0725631.9071011.766402

1.6406011.5277271.4261001 .3342991.251122

1.1301671 .3074991.5162841.9100912.3075332.7990193.3613343.994429

4.6909195.069615

4.886690

4.614127

4.261453

3.438516

2.809491

2.182126

1.630773

1.452035

1.476079

1.475162

1 .4558851 .4235611.668728

1.855957

1.993150

2.080487

2.129918

2.150710

2.150029

2.134131

2.106710

2.071531

2.0302661 .984965

1 .9380571.8471691.707701

1.5912961 .486266

1.3912161.304950

1.177888

1 .3481981.661028

1.9796082.3709732.8150003.3127443.8617444.5780554.4621064.2855014.040633

3.7395163.0772912.566941

2.054309

1.560081

1.271393

1.2798881 .2925991.2887331.2722231.246443

1.441055

1.595815

1.713490

1.792707

1.841862

1 .867663

1.876151

1.8715701 .8563971 .8333351 .8045021.7714881.7355211.6975891.6415451.543052

1.4423931.354319

1.209247

1 .4629601.7233932.0417762.4002882.8002513.2410113.7190804.0930013.964397

3.7983733.581551

3.3226532.778038

2.356067

.930959

.517097

.201725

.117960

.138794

.145104

.139762

.125363

.104151

.261551

.390948

1.492230

1.563339

1.610455

1 .639093

1 .6534211.6554131.6482131 .6339021.6141361.5902461.5632981.5341361.5034371 .4699931 .403559

1.3018761.5182181.7817092.0764252.4036372.7634723.1543733.6152733.6662243.5530123.3997053.2072002.9829242.528092

2.174157

1.816558

1.4658061.130740

.9833111.0087161.0215961.0240281.0179871.005254.987397

1.1167221.226049

1.313822

1.377852

.423035

.452210

.468747

.475155

.473479

.465396

.452271

.435217

.415135

.392761

.368698

.344922

1.3506081.5717761.8176662.0894012.3874172.7111323.0586053.4221593.3163973.2081073.0678102.896666

2.700897

2.316082

2.015407

1.710991

1.410648

1.121163

.927816

.898166

.915142

.922899

.922924

.916620

.905257

.889953

.9978711.091277

.168200

.225954

.267627

.296238

.314152

.323340

.3254421.3218131.3135811 .3016731.2868601.2704601.252685

1 .3992901.6070101 .835564

2.0854752.3566402.6480882.9616313.0933003.0172592.9153162.7874752.6349172.462845

2.133653

1.875498

1.613723

1 .354246

1.102331

.872118

.803703

.823088

.834409

.838783

.837301

.830991

.820975

.807894

.899347

.980043

.047407

.099020

.137490

.165002

.183415

.194292

.198956

.198515

.193902

.185894

.1762151.164156

1.432999

1.6271701.8390292.0685262.3152282.5779802.9074102.8328442.7591752.6640642.5477542.411337

2.2591631.974867

1.751173

1.524087

1.298162

1.077518

.865637

.741188

.743183

.756812

.764253

.766355

.764090

.758105

.749488

.738223

.816060

.886214

.945559

.991936

1.0273371.0534791.0718361.0836681.090046

1.0918821.0904181.0862281.079480

I**«

II

** ISCLT ***** ******** Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 30

ANNUAL GROUND LEVEL CONCENTRATION ( HICROGRAHS PER CUBIC METER

- GRID SYSTEM RECEPTORS -

- X AXIS (DISTANCE, METERS) -

-700.000 -800.000 -900.000 -1000.000 -1100.000

AXIS (DISTANCE , METERS ) - CONCENTRATION -

) FROM ALL SOURCES COMBINED (CONT.) **

-1200.000 -1300.000 -1400.000 -1500.000

1

1•

1•

1•

-2000.000

-1900.000-1800.000

-1700.000

-1600.000

-1500.000

-1400.000

-1300.000-1200.000

-1100.000

-1000.000

-900.000

-800.000

-700.000-600.000

-500.000

-400.000

-300.000

-200.000

-100.000

.000

100.000

200.000

300.000

400.000

500.000

600.000700.000800.000

900.000

1000.000

1100.0001200.000

1300.000

1400.000

1500.0001600.000

1700.000

1800.000

1900.000

2000.000

1

1

1

222222222211111

1

.454955

.635394

.831206

.041681

.266231

.503518

.658181

.605074

.534694

.446427

.340598

.218190

.082896

.835303

.639926

.441426

.243344

.048953

.861070

.705156

.673540

.688581

.698139

.703076

.703765

.701318

.695763

.687777

.677873

.744929

.806309

.858899

.900674

.933207

.957866

.975828

.988116

.995607

.999850

.000699

.998687

1.4668461.635418

1.815522

2.007842

2.212427

2.451918

2.4563722.4046772.338033

2.2563322.159947

2.049739

1.928816

1.7116171.539787

1.365100

1.190356

1.018170

.850843

.690300

.612587

.628560

.639624

.646499

.649737

.649543

.646578

.641290

.634082

.625321

.683576

.737620

.784453

.822191

.852086

.875235

.892598

.905126

.914289

.919567

.921809

1.469836

1.6266681.793858

1 .9708832.1569642.3253712.2778112.2273742.164611

2.089087

2.001170

1.901609

1.7930321.601265

1 .449194

1.294532

1.139513

.986242

.836765

.692418

.591269

.575750

.587709

.595958

.600709

.602454

.601594

.598507

.593539

.587011

.579196

.630184

.678061

.719961

.754150

.781635

.803455

.820699

.833608

.842816

.848834

1.465956

1.6117821.766303

1 .9290602.1061642.1585652.1204562.0710002.0112561.9414131 .8609201.7707341.6729191.502567

1 .367180

1.229447

1.091266

.954206

.820035

.690008

.567143

.528776

.541324

.550416

.556413

.559649

.560458

.559157

.556045

.551395

.545461

.538462

.583374

.626017

.663668

.694906

.720430

.741308

.757728

.770365

.779714

1 .456544

1.5921081.734986

1.8846952.0572892.016015.978807.932382.876636.811448

.737320

.6553631.5669761.4148151.293543

1.170180

1.046260

.923093

.801983

.684098

.570404

.500743

.499755

.509446

.516339

.520711

.522834

.522975

.521389

.518315

.513972

.508562

.502261

.542055

.580428

.614663

.643289

.667080

.686502

.702111

.714378

1.442719

1.5687631.700961

1.838844

1.9158421.887502

1.8513501.8071751.754930

1.694731

1.626871

1.551790

1.471225

1.3346461.225641

1.114728

1.003132

.892013

.782456

.675433

.571778

.479048

.462470

.472511

.480033

.485255

.488402

.489700

.489366

.487605

.484609

.480555

.475608

.470132

.505901

.540420

.571538

.597796

.619761

.637922

.652726

1.4254121.542654

1 .665091

1 .8092381.7993211.7712931.7363811 .6944601.6455211.589680

1.527209

1.458513

1.385062

1.2617931.163343

1.063183

.962313

.861702

.762262

.664817

.570089

.478687

.431273

.439147

.447085

.452930

.456869

.459089

.459775

.459105

.457244

.454351

.450759

.446530

.441635

.473636

.504917

.533228

.557321

.577656

.594646

1.405396

1.5145161.628017

1.7180561.6933631.6658681 .6323041.5925971.5467501 .494890

1.4372571.3741971.307007

1.1953261.106064

1.015254

.923737

.832319

.741774

.652801

.566028

.481988

.418603

.408941

.417134

.423423

.427963

.430912

.432425

.432655

.431749

.430006

.427501

.424219

.420329

.415891

.444748

.473135

.498987

.521149

.540008

1.3833101.484944

1.597063

1.618280

1 .5967301 .569936

1.5377811.5002041 .457242

1.409009

1 .355726

1.297690

1.236043

1.1344821.053250

.970621

.887295

.803959

.721263

.639810

.560141

.482729

.407968

.381535

.389858

.396449

.401437

.404954

.407134

.408106

.408134

.407304

.405677

.403267

.400224

.396634

.392584

.418694

.444555

.468237

.488674

III

I*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling - 1991 ******** PAGE 31

II

** ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAMS PER CUBIC METER- GRID SYSTEM RECEPTORS -

- X AXIS (DISTANCE, METERS) --1600.000 -1700.000 -1800.000 -1900.000 -2000.000

'AXIS (DISTANCE , METERS ) - CONCENTRATION -

) FROM ALL SOURCES COMBINED (CONT.)

11•

I•

1•

-2000.-1900.

000000

-1800.000-1700.-1600.-1500.-1400.-1300.-1200.-1100.-1000.-900.-800.-700.-600.-500.-400.-300.-200.-100.

.

100.200.300.400.500.600.

000000000000000000000000000000000000000000000000000000000000000000000000

700.000

I•

800.900.1000.1100.1200.1300.

000000000000000000

1400.0001500.0001600.0001700.0001800.0001900.0002000.000

1.3596801 .4544241.5529761.5296811.5083711 .4823941.4516531.4161201 .3758381.3309171.2815511.2280041.1712981.0785951.004429.928989.852877.776673.700932.626172.552864.481423.412203.367224.364972.371754.377066.381022.383733.385504.386311.386160.385204.383536.381243.378405.375097.371381.395108.418745.440503

1 .3349261 .4233371.4651741.4483131 .4273871 .4022871.3729461.3393551.3015561.2596591.2138321 . 1643051.1119871.027129.959189.890101.820368.750484.680924.612141.544539.478487.414302.354885.342226.349110.354647.359071.362369.364627.365913.366344.366003.364975.363336.361158.358510.355453.352041.373671.395345

1.3104471 .4044551.3902011.3734211 .3529771 .3287921.3008201.2690611.2335641.1944301.1518071.1059001.057520.979594.917181.853722.789651.725387.661346.597912.535443.474263.414655.356861.325112.328581.334316.338941.342547.345166.346896.347814.347997.347518.346446.344847.342781.340307.337474.334330.354114

.285491

.336658

.322118

.304978

.284452

.261196

.234548

.204515

.171149

.134541

.094827

.052182

.007341

.935587

.878086

.819641

.760614

.701370

.642265

.583636

.525794

.469028

.413741

.360006

.315802

.309665

.315497

.320309

.324139

.327065

.329156

.330480

.331106

.331098

.330518

.329424

.327873

.325916

.323599

.320971

.318112

.266377

.272837

.258858

.242028

.222271

.199478

.173501

.145092

.113698

.079405

.042334

.002638

.960984

.894737

.841638

.787670

.733154

.678405

.623732

.569468

.515955

.463280

.411741

.361534

.312831

.292265

.298133

.303042

.307049

.310215

.312598

.314260

.315259

.315654

.315498

.314845

.313745

.312246

.310391

.308257

.305832

III

*** ISCLT ************* Alcoa Davenport Works - Water Reclamation Faclility Modeling • 1991

X Y CONCENTRATION

DISTANCE DISTANCE

IETERS) (METERS )

*1

II0

IIIIIIIIIIIIIIII

PAGE 32

ANNUAL GROUND LEVEL CONCENTRATION ( MICROGRAMS PER CUBIC METER ) FROM ALL SOURCES COMBINED (CONT.) **

U.3

1948.7

564.5

58.2

-26.9

-23.5

-1265.0-402.0

1.4893343.2230383.7082191.760651

- DISCRETE RECEPTORS -

X Y CONCENTRATION X Y CONCENTRATION

DISTANCE DISTANCE DISTANCE DISTANCE

(METERS) (METERS ) (METERS) (METERS )

1600.1

1948.7

542.8

281.3

-667.4

-1184.0

2.847366

3.969897

5.590256

1725.81430.6211.2

- PROGRAM DETERMINED MAXIMUM 10 VALUES -

X Y CONCENTRATION

COORDINATE COORDINATE

(METERS) (METERS )

900.00

1000.00

1000.00

900.00

800.00

1100.00

900.00

800.00

1100.00

1100.00

-700.00

-700.00

-800.00

-800.00

-800.00

-700.00

-600.00

-600.00

-800.00

-600.00

88.846980

79.904880

62.329950

56.888600

54.225420

44.178780

42.612450

34.597480

34.484150

34.150990

-23.5-983.6-1134.5

4.281786

4.117585

5.954542

II

IIIIIIIIIIIIIIII

ft***************************** ENO OF JSCLT PROGRAM, 3 SOURCES PROCESSED•••••A**********************************