second five-year review reportsecond five year review report bayou sorrel superfund site iberville...

SECOND FIVE-YEARREVIEW REPORT

Prepared forU.S. Environmental Protection Agency,

Region VI1445 Boss Avenue

Dallas, Texas 75202-2733

Prepared byEnvironmental Resources Management

3501 North Causeway Boulevard, Suite 200Metairie, Louisiana 70002

(504)831-6700

cjones*99881*

cjones99881

SECOND FIVE YEAR REVIEW REPORT

BAYOU SORREL SUPERFUND SITEIBERVILLE PARISH, LOUISIANA

Prepared for:

U.S. Environmental Protection AgencyRegion VI

1445 Ross AvenueDallas, Texas 75202-2733

Prepared by:

Environmental Resources Management3501 N. Causeway Boulevard, Suite 200

Metairie, Louisiana 70002(504)831-6700

September 1998

SECOND FIVE YEAR REVIEW REPORT

BAYOU SORREL SUPERFUND SITEIBERVILLE PARISH, LOUISIANA

Stephen Lee Tzhone JyVyU.S. Environmental Proteenon Agency, Region VIRemedial Project Manager

Date

Harold W. Moats DateBayou Sorrel Steering Committee Chairman

EPA CONCURRENCE PAGESECOND FIVE YEAR REVIEW - BAYOU SORREL SUPERUND SITE

/ / S t e p h e n L. Tzhone ) 'Remedial Project Manager

^^QHerbert M. Gorrod

Peer Review

Carlos A. SandierPeer Review

Wren L. Stenger, ChleftLouisiana Projects Management Section

Ediund, ChiefLouisiana / New Mexico Branch

la

Mark A. Peygke, ChiefLitigation And Enforcement Branch

STATEMENT OF PROTECTIVENESS(as required by OSWER Directive 9355.7-02A, Attachment 1, Paragraph IV)

I certify that the remedy selected for this Site remains protective of human health andthe environment.

DateDirectorSuperfund Division

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TABLE OF CONTENTS

EXECUTIVE SUMMARY iv

1.0 BACKGROUND 11.1 INTRODUCTION 11.2 SITE LOCATION AND DESCRIPTION 11.3 SITE HYDROGEOLOGY 21.4 SITE HISTORY 31.5 REMEDIAL GOALS AND OBJECTIVES 41.6 APPLICABLE OR RELEVANT AND APPROPRIATE

REQUIREMENTS (ARARS) 5

2.0 REMEDIAL ACTION 7

3.0 PERFORMANCE EVALUATION 83.1 SITE VISIT/INSPECTION 83.2 SITE INTERVIEWS 93.3 PUBLIC PARTICIPATION 103.4 DOCUMENT REVIEW 10

4.0 SUMMARY 13

5.0 RECOMMENDATIONS 15

6.0 THIRD FIVE YEAR REVIEW 16

List of Figures

1 Monitor Well and Staff Gauge Locations: North Area Cap2 Monitor Well and Staff Gauge Locations: South Area Cap3 Potentiometric Surface Map - June 23, 1997: North Area Cap4 Potentiometric Surface Map - June 23, 1997: South Area Cap

List of Tables

1 Ground Water Database: North Area Cap2 Ground Water Database: South Area Cap3 Porewater Indicator and Water Quality Parameters Database4 Storm Water Indicator and Water Quality Parameters Database

List a/Attachments

1 File Inventory2 Aerial Photographs3. Responses To USEPA Comments

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EXECUTIVE SUMMARY

This document presents a summary of the second Five Year Review for the Bayou SorrelSuperfund Site (Site) located in Iberville Parish, Louisiana. This review was conductedpursuant to Section 121(c) of the Comprehensive Environmental Response, Compensation, andLiability Act (CERCLA), as amended, 42 U.S.C. Section 9121(c), and Section300.430(f)(4)(ii) of the National Oil and Hazardous Substances Pollution Contingency Plan(NCP), and the Office of Solid Waste and Emergency Response (OSWER) Directives 9355.7-02, 9355.7-02A, and 9355.7-03A.

This Second Five Year Review is a Type I review, applicable at sites where response iscomplete. The review is organized to provide background information, including Site locationand description, history, and an evaluation or remedial goals/objectives and applicable orrelevant and appropriate requirements (ARARs).

The Record of Decision (ROD) for the Bayou Sorrel Site, signed on November 14, 1986,required the construction of a slurry wall/clay cap containment system and an extensive post-construction ground water monitoring program. The ground water monitoring program wasinitiated to monitor the remedy's ability to contain the wastes and mitigate the potential forfuture migration of site constituents into the ground water.

Based on a review of Site conditions and data generated from September 30, 1992 to May 31,1998, the United States Environmental Protection Agency (EPA) concludes that the Site posesno significant threat to public health, welfare, or the environment and, therefore, furtherremedial measures pursuant to CERCLA are no longer appropriate. However, Operation andMaintenance (O&M) activities will continue to be performed in accordance with therequirements of the O&M Plan dated December 14, 1988.

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BACKGROUND

INTRODUCTION

Environmental Resources Management (ERM), on behalf of the Bayou SorrelSteering Committee (BSSC), conducted this second Five Year Review of theBayou Sorrel Superfund Site pursuant to Section 121(c) ofCERCLA,300.430(f)(4)(ii) of the NCP, and OSWER Directives 9355.7-02, 9355.7-02A,and 9355.7-03A. This review is a statutory review conducted five years aftercompletion of the first Five Year Review, dated September 30, 1993. Thepurpose of the second Five Year Review is to evaluate the effectiveness of theRemedial Action (RA) subsequent to completion of the first Five Year Reviewand to determine whether the RA remains protective of both human health andthe environment. The review is organized to provide background information,including site location and description, history, and an evaluation of remedialgoals/objectives ARARs. This is a Type I review, as defined by OSWERDirective 9355.7-02A, applicable at sites where response is complete.

In January 1998, EPA Region VI offered the BSSC the opportunity to performthe second Five Year Review at the Site. Representatives from ERM and theBSSC attended a project scoping meeting with the EPA Project Officer onMarch 24, 1998 to finalize a Draft Statement of Work (SOW). ERM submitteda final SOW for the performance of the second Five Year Review on April 13,1998 that incorporated the discussions of the aforementioned meeting.

SITE LOCATION AND DESCRIPTION

The Bayou Sorrel Superfund Site is located in Iberville Parish, Louisiana,approximately 20 miles southwest of Baton Rouge, and about six milesnorthwest of the town of Bayou Sorrel. The western border of the Site is boundby the Borrow River, a man-made drainage feature. This river was formedduring the construction of the Atchafalaya Basin Protection Levee, which islocated approximately 100 yards to the west. The north and east sides of thesite are bordered by the Upper Grand River and Pats Bayou, respectively.Undeveloped swamp land is adjacent to the Site on the south. Access to the Sitefrom the north is along an unpaved levee road, 17 miles south of its intersectionwith Interstate 10 in Ramah, Louisiana. Access to the Site from the South isalong the same unpaved levee road six miles north of the town of Bayou Sorrel.

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SITE HYDROGEOLOGY

On a regional scale, the first aquifer of significance is the Plaquemine aquifer,which is expected to be present at a depth of about 100 to 125 feet beneath theSite. The total thickness of the Plaquemine aquifer in this area is about 600feet. In the vicinity of the Site, the Plaquemine aquifer consists of sand andgravel with a few, thin lenticular interbeds of silt and clay. The Plaquemineaquifer is a confined aquifer with the clays and silts of the overlying top stratum(100 to 125 feet thick) comprising the upper confining unit.

The net movement of ground water in the Plaquemine aquifer in the generalarea of the Site is expected to be to the south/southwest. The direction of flowwill vary on a seasonal basis as a result of recharge from or discharge to theMississippi River. This is due to the hydraulic connection between theMississippi River and the uppermost section of the Plaquemine aquifer inseveral areas where the river has completely cut through the clay and siltdeposits of the top stratum. Additional hydraulic connections between the riverand the aquifer are provided by the sandy point-bar deposits, which occur in theimmediate vicinity of the river. Monitor well and staff gauge locations used todefine ground water flow directions and gradients across the north and southcap areas are provided in Figures 1 and 2, respectively. Ground water flowdirections across the north and south caps are depicted on Figures 3 and 4,respectively. In general, the flow direction in the vicinity of each cap is radial,away from the caps. Surface gradients on each cap promote sheet flow intoperimeter drainage swales designed to accommodate runoff from rainfall events.The swales discharge directly (via culverts installed beneath the Site accessroad) into the North and South Runoff Ponds illustrated on each of theaforementioned figures.

Due to the relatively large distance between the Bayou Sorrel Site and theMississippi River, the effects of seasonal fluctuations in river stage are notbelieved to be significant. This is due to the very low gradient in this area,which results in a very slow rate of ground water movement through theaquifer. Constant fluctuations of the Mississippi River stage affect the watertable in the area of the Site, but only to a minor extent.

Even though there is ground water present on the clays and silts of the topstratum, which immediately underlies the Bayou Sorrel Site, this shallowsaturated zone is not considered a potential source for domestic use because ofthe low available yield and regional water quality. The shallow zone is notuseable as a drinking water supply because of its low transmissivity (the clayand silty deposits of the top stratum are typically in the range of 10'6 to 10"8cm/sec) and its inability to satisfy secondary drinking water standards(analytical results have consistently reported concentrations of chlorides and

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sulfides in excess of these standards). Furthermore, there are no known usersor potential users of shallow ground water proximal to the Site. Ground waterin the shallow saturated zone is analyzed in accordance with the requirements ofthe site-specific Sampling and Analysis Plan and is the only transmissive zoneabove the Plaquemine aquifer. Results of the analyses reported from the fourthquarter of post-construction year 2 through post-construction year 7 aresummarized in Tables 1 and 2.

SITE HISTORY

The Bayou Sorrel Superfund Site is a delisted National Priorities List (NPL)Site that began operation as a hazardous waste landfill in early 1977.

In early 1977, the Environmental Purification Advancement Corporation(EPAC) began operating the Site as a hazardous waste landfill. Approximately50 of the 265 acres were actually used for waste disposal. Wastes weredisposed of in two sludge pits, 4 liquid waste ponds, 2 drum burial cells (1crushed drum/I filled drum), and 1 landfarm area.

According to records retained by the PRP Group, the majority of wastesdisposed at the Site fall into three categories:

• Process wastes from pesticide/herbicide manufacture;

• Sulfide-containing wastes (scrubber blowdown and spent caustic) fromhydrocarbon processing and exploration activity; and,

• Spent wash solutions from boiler-cleaning and equipment cleaningcontractors.

The Site was operated by EPAC until the summer of 1978 when it initiated acourt-ordered closure of the Site from September 1978 through June 1979.During this closure, conducted under the oversight of the State of Louisiana, thecontents of Ponds 1, 2, and 3 were reportedly pumped to Pond 4 where solidswere concentrated by enhancing evaporation and landfarming pond supernatant.These ponds were then filled and covered with soil. Pond 4 was closed by theuse of enhanced evaporation within the pond. The remaining Pond 4 contentswere then covered with natural soils. Sampling activities were performedconcurrent with the closure which resulted in the detection in onsite soils ofvarious organic compounds, heavy metals, phenols, oil and grease, asbestos,cyanide, sulfide, and other various inorganics.

Following subsequent citizen complaints about odor and surface contaminationin the swamp south of the site, the State of Louisiana contracted for a

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preliminary site investigation by Resource Technology, Inc. in 1981. A furtherinvestigation by Woodward-Clyde Consultants was completed in 1982.Definitive surface contamination evidence was collected, but ground water datawas inconclusive. Based on the aforementioned information, the Site wasplaced on the National Priorities List (NPL) on December 20, 1982.

Results from the Remedial Investigation (RI) sampling indicated that surface andsubsurface soil contamination, including herbicide and other organiccompounds, and some cadmium compounds, was found in several areas of theSite. Most of these areas are located in the former sludge pits and disposalponds located in two distinct areas on the Site; the sludge pit and Ponds 1,2,and 3 in the South area and Pond 4 and the crushed drum cell in the North area.There was estimated to be 1,000,000 cubic feet of contaminated soils in theseareas that were deemed to present a current or potential risk if left unmanaged.Some actual waste material (able to liberate hydrogen sulfide) was found in theNorth area as well. Unless the soil cover that was placed in the earlier closureactivities was penetrated, no air emissions were detected anywhere during theinvestigation.

Some inconsistent data indicated the possibility of organic contamination ofshallow ground water, but at very low levels. No organic constituents werenoted in GC/MS analyses of samples from the Plaquemine aquifer beneath theSite, except for a single unknown compound detected in well 11-D. Thisaquifer is separated from the shallow saturated zone by a 100 to 125 ft clay unitand is further protected from the constituents in the shallow zone by its strongupward gradient. Inorganic constituents in the deep and shallow ground water(manganese and barium) were detected in excess of their respective drinkingwater standards; however, historical evidence and background data indicatedtheir presence is not a result of any activities associated with this Site. Acomplete summary of the results of the site analysis performed during the RI isincluded with the RI Report dated November 19, 1984.

A December 1985 Endangerment Assessment, prepared by EPA contractors,concluded that the greatest potential for endangerment from the site wasassociated with direct contact with hazardous wastes at the Site. As a result, thepotential for both surface and subsurface contaminant migration also existed.The population potentially at risk included hunters or fisherman at or near theSite and petrochemical workers using the Site to gain access to their wells.

REMEDIAL GOALS AND OBJECTIVES

The Acting Regional Administrator signed the Record of Decision (ROD) forthe Site on November 14, 1986. The overall remedial action objective is theprotection of public health, welfare, and environment. However, to be aneffective guide, this objective was developed into detailed statements of

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objectives, which are site-specific. These detailed objectives include thefollowing and reflected the need to minimize the potential for migration of sitecontaminants from onsite sources and direct contact with affected media:

• Regrading of the Site to control runoff; limiting erosion of the existing soillayers covering the waste areas, limiting surface water ponding, anddiverting storm water from waste areas;

• Covering former waste disposal areas with RCRA topsoil/geomembrane/claycaps, regardless of their current condition resulting from the closureactivities conducted in 1979;

• Installing a sand/geofabric pore water drainage layer above the wastes andbelow the caps. This layer is connected to a system of pipes, manholes,pumps, and tanks to collect and store any liquids from this layer;

• Installing a gas venting system in the caps to reduce the accumulation ofmethane and other gases beneath the caps;

• Consolidating all miscellaneous wastes outside existing covered wastedisposal areas under the new caps for grading and fill purposes;

• Installing a slurry wall approximately 30 feet deep (keyed into theunderlying natural clay liner found at that depth) around the former landfill(South) area. Installing a more shallow slurry wall around the former Pond4 (North) area;

• Installing fences around all newly capped areas to restrict access to thedisposal areas. Constructing gravel access roads around the fenced areas toallow continued recreational use of adjacent lands and the borrow lake whilediverting traffic around and away from the disposal areas; and

• Installing a ground water monitoring system to monitor the effectiveness ofthe remedy.

APPLICABLE OR RELEVANT AND APPROPRIATE REQUIREMENTS(ARARS)

The ROD identified the Resource, Conservation, and Recovery Act (RCRA), 42U.S.C. Section 6901 et. seq., as the primary ARAR governing remedial activityat the Site. Specifically, the ROD states that the selected remedy would complywith RCRA capping requirements, as well as, all other applicable or relevantand appropriate standards, requirements, criteria, or limitations as by Section121(d) of CERCLA. Nor were there any chemical specific ARARs identifiedby the ROD.

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The Remedial Concept Design (RCD) document, dated July 15, 1987, specifiesrequirements for sampling and analysis of storm water, porewater, and groundwater during the post-construction 30 year monitoring period; however, theO&M Plan more specifically describes the sampling and analysis proceduresand techniques.

The O&M Plan, discussed in the following section, provides for a mechanism todetermine the statistical significance of the analytical data collected from theground water sampling and analysis. The ground water at the site is measuredfor quantification and statistical analysis and is needed to determine if theremedy is still satisfying the requirements of the ROD. The Ground WaterStatistics Plan, dated July 15, 1987, was designed to satisfy these requirementsand provide a mechanism to determine the significance of ground wateranalytical variances over the Site's 30-year post-construction monitoring period.Descriptive statistical evaluations and trend analyses are performed annually.

The Quality Assurance Project Plan (QAPP), dated April 24, 1989, provides asystem for facilitating quality assurance and quality control of the analytical datacollected in accordance with the O&M Plan. It also describes the limits fordischarge and/or use of the ground water sampling purge water, porewater, andsurface water. The porewater at the Site is currently being utilized to irrigatethe caps.

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REMEDIAL ACTION

The selected remedy inhibits the migration of the wastes by providing a barrierin all directions. The slurry wall keys into the aforementioned clay unit (100 to125 ft. thick) which reduces the potential for lateral migration of the affectedmaterials. The combination of the natural upward gradient existing between thePlaquemine aquifer and shallow saturated zone, and the clay unit underlying theSite effectively mitigates the potential for the vertical migration of waste. Theclay cap inhibits infiltration, surface water exposure, and direct contact.

Because wastes were left on the Site, the Record of Decision required anextensive Operations and Maintenance (O&M) program to document that theconstructed remedy remained protective of human health and the environment.As a result, an O&M Plan, dated December 14, 1988, was developed whichoutlined the activities to be implemented subsequent to completion of theremedy. O&M activities will be conducted for a period of 30 years, at whichtime EPA will determine if additional O&M activities are necessary.

The main feature of the O&M Plan centers on the strict monitoring of theground water immediately outside the slurry wall/clay cap. Forty-threemonitoring wells provide a triggering mechanism whereby frequent samplingand analysis of the wells is used to identify any sudden degradation of thequality of the area's ground water before wastes can migrate. At the end ofeach post-construction year, a ground water statistics report is generated thatstatistically relates the changes of the ground water quality over time.

The other major feature of the O&M Plan is the semi-annual engineeringinspections. These inspections focus on the physical features of the clay caps,surface water drainage, porewater collection and irrigation systems, and otherphysical features of the remedy. Subsequent to each inspection, a reportdocumenting the findings is generated. Any deficient areas are addressedpromptly under guidance from the EPA.

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PERFORMANCE EVALUATION

SITE VISIT/INSPECTION

EPA conducted its most recent site visit on May 20, 1998. During that visit,the Site appeared in good condition with no significant maintenance oroperational deficiencies. Operation and maintenance activities continue to beconducted each week in accordance with the requirements of the O&M Plan.ERM, on behalf of the BSSC, completed the first semi-annual inspection ofpost-construction year 8 for the Site on March 27, 1998. Specific areas of theinspection are summarized below.

The north and south cap areas are covered with generally rich growth ofBermuda and other shallow rooted grasses. There were small areas wheresparse weed growth was evident. No evidence of erosion was observed oneither cap.

On May 18, 1998, ERM, on behalf of the BSSC, initiated shallow burial of theporewater irrigation system on the north and south caps. Burying the irrigationsystem provided several advantages including:

• Reduced exposure of the PVC line to UV radiation;

• Less chance for damage to the line during site mowing; and,

• Potentially decreased labor associated with manually trimming thevegetation adjacent to the line.

The burial includes only that portion of the PVC lines used to distribute theporewater onto the caps.

Historical settlement plate elevation monitoring has shown that no differentialcap settlement has occurred and overall settlement is now essentially non-measurable. No visual signs of differential settlement on either cap wasobserved during this or prior inspections.

Inspection of the perimeter fence around the north and south cap areas indicatedthat the security system for each cap remains in good condition. Several of thewarning signs attached to the inside of the fence on both caps had fallen as aresult of prolonged exposure to the elements and the intensity of recent stormevents. These plastic signs were replaced with aluminum signs that will exhibitgreater resistance to weathering and as a result, maintain a longer presence onsite.

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The presence of several, small animal burrow holes were noted beneath andwithin the limits of the perimeter fence on both caps. These burrow holes aresimilar to those noted in past inspections and are filled with onsite borrow soilas part of routine maintenance activities. Inspection of the holes continues toshow that the burrowing animals stop digging when they reach the sand layerand do not approach the geomembrane liner.

The ditches and culverts at the Site remain in excellent condition with no signsof erosion or excess siltation. Standing water is observed in the perimeterdrainage ditches on both the north and south caps when surface water bodiessurrounding the Site near capacity.

Aerial photographs of the Site were taken on June 11, 1998. These photographsillustrate the current conditions of both caps and are provided as Attachment 2.

SITE INTERVIEWS

Since activities associated with the operation and maintenance of the Site arecarried out by BSSC through ERM, the performance evaluation of the remedyalso included work efforts to interview the individuals within State and Federalagencies responsible for the oversight of these activities. A local resident anddaily Site caretaker, as representative of the local community, was alsointerviewed. Individuals were asked the following questions:

1) Do you have any concerns relative to the remedy and its ability to protecthuman health and the environment from the potential hazards associatedwith the Site?; and,

2) Has anyone expressed any concerns to you, relative to the remedy and itsability to protect human health and the environment from the potentialhazards associated with the Site?

The interviewees included:

• Ward McGlothlin, Bayou Sorrel resident and daily Site caretaker;

• Rich Johnson, Louisiana Department of Environmental Quality; and,

• Stephen Lee Tzhone, U.S. Environmental Protection Agency, Region VI.

Each individual responded 'No' to both of the aforementioned questions whichreaffirms that the remedy selected for this Site remains protective of humanhealth and the environment and that no concerns have been expressed bymembers of the community to those individuals most likely to be contacted.

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PUBLIC PARTICIPATION

EPA and the BSSC have encouraged public participation during the planning,preparation, and performance phases of the remedy selected for this Site.Opportunities for public involvement included numerous public meetings andcomment periods. As a result of these prior and continued communicationswith the public during the aforementioned phases of work, no significantcomments were received and the Site was subsequently deleted from the NPLon September 29, 1997. Details of this Deletion Notice are included in theSeptember 29, 1997 edition of the Federal Register.

DOCUMENT REVIEW

Attachment 1 provides a list of documents that were examined in conjunctionwith the second Five Year Review. The objective of this task was to review theeffectiveness of the selected remedial action technologies and the ability of thesecomponents to protect human health and the environment.

One element of a review of ground water conditions at the Site, which is notincorporated into nor evaluated in a statistical analysis is site and regionalground water conditions as they relate to potential ground water usage andpotential receptors. The shallow saturated zone described in Section 1.3 doesnot meet primary or secondary drinking water standards and is not utilized as adrinking water source in the vicinity of the Site. Ground water in this zone isanalyzed in accordance with the monitoring requirements of the site-specificSampling and Analysis Plan and is the only transmissive zone above thePlaquemine aquifer.

The only area of concern identified in the first Five Year Review Report wasthe detection of arsenic in the shallow ground water. At the request of EPARegion VI, and on behalf of the BSSC, ERM generated a report, datedDecember 6, 1995, that discussed the presence of arsenic in ground water as itrelated to the Bayou Sorrel Site. The information includes a discussion of thegeneral shallow ground water conditions at the Site, a historical summary ofarsenic ground water concentrations at the Site, and information on theprevalence of arsenic in ground water in south Louisiana.

In summary, the arsenic concentrations which have been reported at the Sitehave been higher than the Maximum Contaminant Level (MCL) in areas of theSite where no historical waste handling activities were known to occur as wellas in the ground water monitoring system. The shallow ground water at the Sitehas a very limited potential for receptors and higher concentrations of arsenic inground water have been documented in the upgradient monitor wells and atnumerous other locations in south Louisiana.

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In a memorandum from Jon D. Rauscher, Ph.D., EPA Toxicologist, datedJanuary 15, 1997, Dr. Rauscher concluded that arsenic detected in the groundwater at the Site appeared to be naturally occurring and recommended that thedelisting of this Site from the NPL proceed. His conclusion was based on areview of the following documents:

1) Regional arsenic ground water information submitted by ERM onDecember 6, 1995;

2) Bayou Sorrel Health Consultation by the Louisiana Office ofPublic Health (LOPH)/Agency for the Toxic Substance andDisease Registry (ATSDR) dated May 8, 1995; and,

3) EPA Five-Year Review dated September 30, 1993.

On May 8, 1995, the Louisiana Office of Public Health - Section ofEnvironmental Epidemiology (LOPH) in conjunction with the Agency for ToxicSubstances and Disease Registry (ATSDR) issued a Health Consultation for theBayou Sorrel Site. The Health Consultation addressed the following:

• sampling and analysis of local fish to determine if site-related contaminantsmigrated off-site and currently pose a public health threat via fishconsumption; and,

Based on the information and the data reviewed, the LOPH concluded thatthe only inorganic compound detected at elevated levels was mercury.Mercury was detected at various levels in several species of fish sampled forthe consultation. Mercury is considered a common fish contaminant;however, its presence is not related to the Site.

• a private water well survey and sampling to determine if ground water hasbeen affected by site contaminants.

Water sampled and analyzed from an existing private well in the town ofBayou Sorrel, Louisiana did not indicate any elevated levels of arsenic orother contaminants. Public water for the Bayou Sorrel area is supplied bythe Iberville Waterworks ff3 and met all federal requirements for primarydrinking water standards at the time of the LOPH study.

Based on the above information, the BSSC believes the presence of arsenic inground water at the Site is not attributable to the waste areas of the Site.Therefore, this issue should not be a concern relative to on-going post-construction activities, especially since the shallow ground water is not utilizedas a source of drinking water. Ground water data collected subsequent to the

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aforementioned report, dated December 6, 1996, continue to demonstrate thatthe arsenic is indicative of natural conditions and is not associated with wastemigration from the cap/slurry wall containment system. This data issummarized in the annual Ground Water Monitoring Report and subsequentlyevaluated in the corresponding Ground Water Statistics Report to show that theremedy remains protective of human health and the environment.

All the remaining documents included in Attachment 1 support the aboveconclusions and enabled the USEPA to delete the Site from the NationalPriorities List (NPL). The Site Deletion Docket dated September 29, 1997, andincluded as part of this document review, focused on the technical requirementsthat were developed to determine 'completion' of this Site (a site is classified asa 'completion' following implementation of all appropriate remedial actions).The docket also describes the subsequent procedural requirements for deletingsites from the NPL. The Notice of Deletion for the Bayou Sorrel SuperfundSite was published in the September 29, 1997 edition of the Federal Register.

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SUMMARY

This section provides a summary of the analytical history of the Bayou SorrelSuperfand Site from completion of the first Five Year Review Report, datedSeptember 30, 1993 through May 31, 1998. This summary includes the groundwater data collected up to and including the Post-Construction Year 7 annualmonitoring event. All of the data collected thus far as part of the post-construction O&M program is located in the site file at the USEPA Region VIheadquarters in Dallas, Texas. The file is continually updated and copies of allthe file contents are included in the Bayou Sorrel Public Repository inPlaquemine, Louisiana at the city public library.

Ground water sampling activities have been conducted in accordance with theEPA approved Sampling and Analysis Plan, which is based on the requirementsoutlined in the QAPP. The Sampling and Analysis Plan is revised on a frequentbasis primarily to establish specific sampling schedules. The analyticalparameters were selected based on negotiations conducted prior to issuance ofthe ROD and the constituents known to be present on site.

A review of the ground water data collected through post-construction year 7continues to indicate that the remedy selected for the Site remains protective ofhuman health and the environment. Results of the statistical evaluationperformed during post-construction year 7 concluded that although somestatistically significant differences and trends exist, there is no potential short-er long-term risks associated with ground water. All corroborating groundwater, storm water, and porewater data from the fourth quarter of post-construction year 2 through post-construction year 7 is summarized in Tables 1-4. Data from post-construction year 8 is not included.

Operation and Maintenance (O&M) activities continue to be conducted inaccordance with the O&M Plan. These activities include:

• Weekly Site inspections by the Site caretaker;

• Mowing the Site four times per year beginning in April;

• Inspecting the caps for erosion and other surface damage after significantflooding events;

• Viewing the surface of the caps after mowing for signs of ponding and/ordisruption of proper drainage patterns;

• Inspecting and maintaining the components of the porewater collection andmonitor well systems; and,

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• Amending any significant deficiencies to the access roads by regrading orfilling with limestone.

The continued presence of BSSC contractors at the Site enables any potentialissues to be addressed quickly and efficiently.

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RECOMMENDATIONS

Based on a review of the site conditions and data generated from September 30,1992 to May 31, 1998, the BSSC plans to continue Site operation andmaintenance in accordance with the requirements of the O&M Plan. Noadditional remedial actions are necessary since the remedial action implementedat this Site remains protective of human health and the environment. The BSSCwill continue to monitor the ground water regime in accordance with the BayouSorrel Sampling and Analysis Plan and assimilate data from each well tocontinue building the database for the statistical analysis in accordance with theGround Water Statistics Plan.

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THIRD FIVE YEAR REVIEW

The next Five Year Review for the Bayou Sorrel Superftmd Site will beconducted by September 30, 2003.

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Tables

List of Tables

1 Ground Water Database: North Area Cap2 Ground Water Database: South Area Cap3 Porewater Indicator and Water Quality Parameters Database4 Storm Water Indicator and Water Quality Parameters Database

20-79M2946M.XLS

Table 1

Ground WaterIndicator and Water Quality Parameters Database

Fourth Quarter, Post-Construction Year 2 through Post-Construction Year 7

North Area CapBayou Sorrel Site

Iberville Parish, Louisiana

Well IDMW-1NMW-1NMW-1NMW-1NMW-1NMW-1NMW-1NMW-1N

MW-2NMW-2NMW-2NMW-2NMW-2NMW-2NMW-2NMW-2N


MW-4NMW-4NMW-4NMTW-4NMW-4NMW-4NMW-4NMW-4N

SampleDate

11/10/925/4/93

11/16/934/25/9411/8/945/2/95

5/14/966/24/97

11/10/925/4/93

11/16/934/25/9411/8/945/2/95

5/14/966/24/97

11/10/925/4/93

11/16/934/25/9411/8/945/2/95

5/14/966/24/97

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/14/966/24/97

PH6.606.446.546.626.616.416.726.86

6.686.476.656.626.726.476.736.80

6.556.476.786.656.746.446.696.90

6.726.646.676.686.726.626.756.91

SC18301960157021001816182018201830

18502010149020001980193018971880

20002140105015001563122013701340

20802290197024102400244024402060

TOC23

889898

10

159

109

10111113

207967578

2712131314131315

Chloride158139157139147175171169

141121133111122141141130

211206

7272869083

84.6

146129151165145171192130

Sulfate4545642

2.48

4246352

1.271

2423

10749413024

24.3

4515321

0.89

As0.0190.0120.0150.0130.0100.0200.010

0.01

0.0100.0120.0100.0100.0100.0200.0100.03

0.0100.0100.0100.0100.0100.0100.010

0.01

0.0210.0120.0220.0280.0410.0300.0300.04

Cd0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

Cr0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

Pb0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010,0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

Phenol0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

20-79M2946M.XLS

Table 1 (Continued)








MW-8NMW-8NMW-8NMW-8NMW-8NMW-8NMW-8NM"W-8N

SampleDate

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/14/966/24/97

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/14/966/24/97

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/14/966/24/97

11/10/925/4/93

11/16/934/26/9411/8/945/2795

5/14/966/24/97

PH6.646.576.666.616.796.496.656.86

6,646.586.646.616.766.536.666.84

6.596.566.626.646.736.476.636.82

6.536.506.636.566.766.486.586.68

SC22502410208029002200224026002220

36703720348040003800352039003510

23102240231030002300209027402200

25702660245027002430243025802420

TOC18787879

10

21887

108

1111

155657587

2415121414121517

Chloride329322323259338362361285

792634625590801714696681

471289423320436320465330

455413435412425517401422

Sulfate31312625211915

15.4

38343537213219

22.1

1927162316262

17.3

' 11876974

3.46

As0.0100.0100.0100.0100.0120.0100.010

0.02

0.0140.0100.0140.0100.0290.0300.030

0.04

0.0100.0100.0100.0100.0100.0100.020

0.01

0.0190.0130.0100.0120.0140.0100.020

0.01

Cd0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

Cr0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

Pb0.20.20.20.20.20.2

, 0.20.01

0.20.20.20,20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0,20.20.20.20.20.20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0,0010.0010.0010.0010.0010.0010.0010.001

Phenol0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

20-79M2946M.XLS

Table 1 (Continued)







MW-1 INMW-11NMW-1 INMW-11NMW-1 INMW-11NMW-11NMW-11N


SampleDate

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/14/966/24/97

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/14/966/24/97

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/13/966/24/97

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/13/966/24/97

pH6.646.596.796.726.806.486.906.95

6.676.626.686.676.846.496.706.89

6.396.356.486.476.606.176.596.61

6.756.666.716.706.866.396.846.91

SC34403450321032003170303033803200

26602720238027002810247027902480

22202330201026002240174024502040

21702430216025002380231023502360

TOC20119

1110101112

166769697

135567678

2213131312141415

Chloride647624667612623703589607

455380366309404339388321

458355385381424344435384

303307275307302341337297

Sulfate36292820173711

17.5

5169526545614357

2121191115145

10.5

3235332

0.2

As0.0890.0440.0840.0550.0620.0800.0700.09

0.0100.0100.0100.0100.0120.0100.010

0.02

0.0100.0100.0100.0100.0100.0100.0300.01

0.0120.0270.0190.0100.0150.0200.020

0.02

Cd0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020,020.02

0.005

0.010.010.010.010.020.020.02

0,005

0.010.010.010.010.020.020.02

0.005

Cr0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

Pb0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

.0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

Phenol0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

20-79M2946M.XLS

Table 1 (Continued)





Well ID


UW-1NUW-1NUW-1NUW-1NUW-1NUW-1NUW-1NUW-1N

UW-2NUW-2NUW-2NUW-2NUW-2NUW-2NUW-2NUW-2N

SampleDate

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/13/966/24/97

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/14/966/24/97

11/10/925/4/93

11/16/934/26/9411/8/945/2/95

5/13/966/24/97

pH

6.586.546.646.676.666,356.776.84

6.616.676.696.646.786,576:676.84

6.626.546.636.566.746.496.656.83

SC

34403670323036003400330031402660

23902810252034002740252027202560

17802100173025001940186018941830

TOC

1699999

1213

238989899

2710121111101111

Chloride

805765750678653798517408

435369405357 .323380395371

187191175155159167151164

Sulfate

1214421

0.26

33382521382717

20.9

678

10956

3.89

As

0.0220.0190.0230.0220.0240.0100.030

0.03

0.0140.0100.0100.0100.0100.0100.010

0.01

0.0130.0100.0100.0100.0100.0100.0100.01

Cd

0.010.010.010.010.020.020.02

0.005

0,010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

Cr

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

Pb

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.2

'0.20.20.20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

Phenol

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

20-79M2946M.XLSTable 2


Years 1 through 7

South Area CapBayou Sorrel Site


WellName

MW-1SMW-1SMW-1SMW-1SMW-1SMW-1SMW-1SMW-1S



MW-4SMW-4SMW-4SMW-4SMW-4SMW-4SMW-4'SMW-4S

SampleDate

11/11/925/5/93

11/18/934/27/9411/8/945/2/95

5/15/966/24/97

11/11/925/5/93

11/18/934/27/9411/8/945/2/95

5/15/966/24797

11/11/925/5/93

11/18/934/27/9411/8/945/2/95

5/15/966/24/97

11/11/925/5/93

11/18/934/27/9411/8/945/2/95

5/15/966/24/97

PH6.666.756.706.726.806.506.826.78

6.576.676.696.696.786.616.756.76

6.606.596.636.636.876.646.746.75

6.636.706.686.716.836.686.706.76

SC

30703650252031103160347033903200

27403330221031002950307029502820

28403540274029502900315031403000

30503750260032003200314033403070

TOC

13109879

1112

14101098

111112

151110108

111213

1610997

101212

Chloride

772760764722682744714761

690609654635635592244624

687695731697696761735756

750740744700745724728715

Sulfate

1412421

0.2

1217

12359

6.22

234642 .1

0.35

118

111922221612

As

0.1220.1000.1130.1520.1170.1500.130

0.19

0.0440.0880.0370.0360.0370.0200.0200.02

0.0100.0100.0100.0100.0100.0100.010

0.01

0.0790.0380.0100.0680.0620.0500.0600.07

Cd

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

Cr

0.020.020.020.020.04-0.040.040.01

0.020.020.02 \0.020.040.040.040.01

0.020.020.020.020.04;0.040.040.01

0.020.02;0.02:0.02 :0.04:0.040.04:0.01.

Pb

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

Phenol

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

20-79M2946M.XLS

Table 2 (Continued)


Years 1 through 7



WellName





SampleDate

11/11/925/5/93

11/18/934/27/9411/8/945/2/95

5/15/966/24/97

11/11/925/5/93

11/18/934/27/9411/8/945/2/95

5/15/966/24/97

11/11/925/5/93

11/18/934/27/9411/9/945/2/95

5/15/966/25/97

11/11/925/5/93

11/18/934/27/9411/9/945/2/95

5/15/966/25/97

PH6.486,586.546.666.776.556.736.78

6.566.696.586.676.756.596.636,78

6.486.436.536.666.596.556.566.94

6.736.606.726.196.776.676.676.94

SC26303060241025102500228025502270

19202360198023502100220024702290

30403530306035003250322030403230

30003320288032403180268027803110

TOC141212128

131213

2114131210121215

1610987

1011n20108

107

101111

Chloride590446339282443308293270

247267221205219212207225

607836780740754792737782

665644659682642662656677

Sulfate3

136264.252722

32.6

17

4216121110

9.04

13:56422

2.04

667

11979

10.9

As0.0140.0100.0100.0100.0100.0100.0100.01

0.0110.0100.0100.0100.0100.0100.0100.01

0.0580.0430.0580.0490.0710.0500.050

0.06

0.0510.0450.0600.0550.0290.0400.030

0.02

Cd0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

Cr0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

Pb0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0,0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

Phenol0.00250.00250.00250.00250.00250.00250.00250.005

0.00250.00250.00250.00250.00250.00250.00250.005

0.00250.00250.00250.00250.00250.00250.00250.005

0.00250.00250.00250.00250.00250.00250.0025

0.005

20-79M2946M.XLSTable 2 (Continued)


Years 1 through 7



WellName





SampleDate

11/11/925/5/93

11/18/934/27/9411/9/945/3/95

5/15/966/25/97

11/11/925/5/93

11/18/934/27/9411/9/945/3/95

5/15/966/25/97

11/11/925/5/93

11/18/934/27/9411/9/945/3/95

5/15/966/25/97

11/11/925/5/93

11/18/934/27/9411/9/945/3/95

5/15/966/25/97

PH6.656.616.756.826.616.756.646.94

6.656.596.686.766.636.786.636.9

6.776.666.766.796.876.806.627.05

6.626.596.636.706.716.676.546.79

SC28803210270031902700316027103050

30403460274033202900336029203150

24802840231027502660280023002620

35803980371041003940400035503830

TOC24

87878

1010

20987699

10

187776788

167776799

Chloride790617604605580611607611 ,

327815314382307367 j383334

405,428409432365408408407

705750681705594708656705

Sulfate8677 ,996

7.51

406392344327^389343 .391297

6462814955586462

347340380338414448351326

As0.1290.1290.1700.0970.0750.1100.120

0.08

0.0100.0100.0100.0100.0100.0100.010

0.01

0.0570.0660.0900.0880.0860.0500.080

0.13

0.0550.1090.0410.0580.0730.0500.050

0.06

Cd0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

Cr0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

Pb0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010,0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

Phenol0.00250.00250.00250.00250.00250.00250.00250.005

0.00250.00250.00250.00250.00250.00250.00250.005

0.00250.00250.00250.00250.00250.00250.00250.005

0.00250.00250.00250.00250.00250.00250.00250.005

20-79M2946M.XLS

Table! (Continued)


Years 1 through 7



WellName





SampleDate

11/11/925/5/93

11/18/934/26/9411/9/945/3/95

5/15/966/25/97

11/11/925/5/93

11/18/934/26/9411/9/945/3/95

5/15/966/26/97

11/10/925/5/93

11/18/934/26/9411/9/945/3/95

5/15/966/25/97

11/10/925/5/93

11/18/934/26/9411/9/945/3/95

5/15/966/26/97

pH

6.806.646.766.756.886.856.496.92

6.706.656.766.696.786.806.716.88

6,676.606.716.656.766.806.756.81

6.576.426.536.466.696.606.326.84

SC

27702880254032002560295025602880

30303260257034003100349031303840

37503780311024003910415038803360

33203490290030003560391035204090

TOC

1899

12799

10

137774685

18101022

6241715

167775

141311

Chloride

554471485522413504494478

691659664690

64718704751

675659634675584654630573

629619639631587674670694

Sulfate

115709461

1076298

83.8

9187947890

103111

14.7

10212318183215

101

257234282306316326297405

As

0.2210.2400.1070.2270.2400.2200.200

0.21

0.1050.0680.0630.0900.0910.0800.080

0.09

0.0160.0110.0150.0160.0140.0200.0300.03

0.0830.0650,0420.0510.0490.0300.0300.03

Cd

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0,010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

Cr

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

Pb

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

Phenol

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0,00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

20-79M2946M.XLS

Table 2 (Continued)


Years 1 through 7



WellName





SampleDate

11/10/925/5/93

11/17/934/26/9411/9/945/3/95

5/14/966/26/97

11/10/925/4/93

11/17/934/26/9411/9/945/3/95

5/14/966/26/97

11/10/925/4/93

11/17/934/26/94

11/10/945/3/95

5/14/966/26/97

11/10/925/4/93

11/17/934/26/94

11/10/945/3/95

5/14/966/26/97

PH

6.586.416.556.556.956.656.596.77

6.566.576.536.587.016.766.676.82

6.666.616.596.616.396.726.696.83

6.656.006.546.606.226.656.626.85

SC

21902250229024002300243024202290

18201950165020001600191019841870

25102540210027002090255025802450

23202900225027002120284026202610

TOC

2011101211101211

2115141414141415

2013121312131414

2617171817171818

Chloride

385390402391407395381384

317639310314313337305309

470554424436447492442458445375453401432447422478

Sulfate

1920622731312432

121

10131

0.23

1315142

2.251413141

0.3

As

0.0160.0120.0100.0170.0100.0100.010

0.02

0.0250.0360.0150.0220.0100.0100.020

0.02

0.0310.0420.0220.0260.0170.0200.030

0.02

0.0100.0100.0100.0100.0100.0100.010

0.01

Cd

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.0050.010.010.010.010.020.020.02

0.005

Cr

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040,040.040.01

0.020.020.020.020.040.040.040.01

Pb

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20,2020.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

Phenol

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

20-79M2946M.XLS

Table 2 (Continued)


Years 1 through 7



WellName





SampleDate

11/10/925/4/93

11/17/934/26/94

11/10/945/4/95

5/14/966/26/97

11/10/925/4/93

11/17/934/26/94

11/10/945/4/95

5/14/966/26/97

11/10/925/4/93

11/17/934/26/94

11/10/945/4/95

5/14/966/26/97

11/10/925/4/93

11/16/934/26/94

11/10/945/4/95

5/14/966/26/97

PH6.516.486.466.476.416.516.536.78

6.476.606.486.476.286.656.636.85

6.566.486.426.476.306.636.616.74

6.696.586.726.576.496.696.706.94

SC22402390195023002170232023502160

1970161014302200780

169018631690

25102830228029002760277027202530

25602810245029002530291028302720

TOC2618171918181918

4434383742354434

1813121313131414

12109

1011101313

Chloride430430412417431465411423

340164262312304307280267

600289537578529609559580

532546487

2540758520492493

Sulfate1226531

0.2

12546382

3.691225132

0.2

14101010121311

13.2

As0.0350.0350.0350.0410.0240.0200.0300.03

0.0100.0100.0100.0100.0100.0100.0100.01

0.0100.0100.0100.0100.0100.0100.010

0.01

0.0100.0100.0100.0100.0100.0100.010

0.01

Cd0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

Cr0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

Pb0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20,20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010.001

Phenol0.00250.00250.00250.00250.00860.00250.00860.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.0025

0.0110.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

20-79M2946M.XLS

Table 2 (Continued)


Years 1 through 7



WellName


UW-1SUW-1SUW-1SUW-1SUW-1SUW-1SUW-1SUW-1S

UW-2SUW-2SUW-2SUW-2SUW-2SUW-2SUW-2SUW-2S

SampleDate

11/10/925/4/93

11/16/934/26/94

11/10/945/4/95

5/14/966/26/97

11/10/925/4/93

11/16/934/26/94

11/10/945/4/95

5/15/967/11/97

11/10/925/4/93

11/16/934/26/94

11/10/945/4/95

5/15/966/26/97

pH

6.666.576.686.626.576.686.636.85

6.716.616.706.596.976.796,77

7.6

6.296.336.396.336.636.506.61

6.6

SC

35603760343038403900357033103300

43704730437041004470477045704290

47805630427040304220524046204430

TOC

19777879

10

116566575

145556699

Chloride

802760725715512718627591

11601160116011701180110011601230

14201550125012901140131012101330

Sulfate

23332530351151

40.7

1213383

145

2.21

86

1312473

1.64

As

0.0100.0100.0100.0100.0100.0100.010

0.01

0.0520.0310.0390.0480.0350.0500.060

0.05

0.0100.0100.0100.0100.0100.0100.010

0.01

Cd

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

0.010.010.010.010.020.020.02

0.005

Cr

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

0.020.020.020.020.040.040.040.01

Pb

0.20.20.20.20.20.20.2

0.01

0.20.20.20.20.20.20.2

0,01

•0.20.20.20.20.20,20.2

0.01

Ethyl-benzene

0.0010.0010.0010.0010.0010.0010.0010.001

0.0010.0010.0010.0010.0010.0010.0010,001

0.0010.0010.0010.0010.0010.001o.o'o i0.001

Phenol

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

0.00250.00250.00250.00250.00250.00250.00250.0025

20-79M2947M.XLS

Table 3

PorewaterIndicator and Water Quality Parameters Database


Bayou Sorrel SiteIberville Parish, Louisiana

PorewaterChamber

PC-1PC-1PC-1PC-1PC-1PC-1PC-1PC-1PC-1PC-1PC-1PC-1PC-1


SampleDate

11/11/922/11/935/5/938/5/93

11/17/932/17/944/27/948/11/94

11/10/942/15/955/3/95

2/15/956/25/97

11/11/922/11/935/5/938/5/93

11/17/932/17/944/27/948/11/94

11/10/942/15/955/3/95

2/15/956/25/97

pH7.197.056.797.057.107.556.816.837.187.016.856,857.49

7.466.807.167.046.8

7.856.937.127.007.026.686.537.03

SC1880158025402840166023602110310027702500256022502050

149022501674272013701749164017212300

8901200890666

TDS1430880 -

22001520147013101440218017701580175013801420

1120128017801890466567876

14001420529796584435

TOC208

2012101112141112131214

1410149

12121114139

121514

TSS COD 0&G

56 60

28 54

20-79M2947M.XLS

Table 3 (Continued)




PorewaterChamber


SampleDate

11/11/922/11/935/5/938/5/93

11/17/932/17/944/27/948/11/94

11/10/942/15/955/3/95

2/15/956/25/97

pH

7.437.236.987.066.737.786.886.516.947.016.526.256.90

SC

1620150014501610131012391540178518501590131017951780

TDS

1120862

204010201090962828

15201130942868

11101160

TOC

171111111111111213111113-13

TSS

3

COD 0&G

42


11/11/922/11/935/5/938/5/93

11/17/932/17/944/27/948/11/94

11/10/942/15/95

5/3/952/15/956/25/97

6.796.856.577.026.737.227.276.667.046.616.946.257.18

2360236024702610126016031720205022103050134019401730

1700148027401850128012601020168013501850115012601160

1799

101298

1012288

1912

47

20-79M2947M.XLS

Table3 (Continued)




PorewaterChamber


SampleDate

11/11/922/11/935/5/938/5/93

11/17/932/17/944/27/948/11/94

11/10/942/15/95

5/3/952/15/956/25/97

pH

7.397.237,326.977.167.837.077.067.296.736.836.257.17

SC

1760144010591710149013881510175320101590960

13241330

TDS

1380860

1440990

1270904864

14301300970684871876

TOC

17161312141413171924142012

TSS

1

COD 0&G

58


11/11/922/11/935/5/938/5/93

11/17/932/17/944/27/948/11/94

11/10/942/15/955/3/95

2/15/956/25/97

6.776.747.277.316.676.496.886.787.146.636.616.677.38

2450372010662270216029203310215026902560213028702110

1880181011601600198017202040167016001630155019501460

17138

11111225111420192015

63 97 14

20-79M2947M.XLS

Table3 (Continued)




PorewaterChamber


SampleDate

11/11/922/11/935/5/938/5/93

11/17/932/17/944/27/948/11/94

11/10/942/15/955/3/95

2/15/956/25/97

EH

7.076.356.923.936.957.067.166.956.947.016.736.626.97

•SC

2740306023102920193023202900297030002920284031602850

TDS

1820172025601940165015701880225018301890208019002050

TOC

158

108

158789

15141513

TSS

47

COD 0&G

79


11/11/922/11/935/5/938/5/93

11/17/932/17/944/27/948/11/94

11/10/942/15/955/3/95

2/15/956/25/97

7,056.586.886.936.667.177,056.466,817.076,746.436.97

2000232024802390159019192410251024802560233026502510

1450134020401660128012501430191015001560165015901650

20121211141111121312151716

40 90

20-79M2947M.XLS

Table 3 (Continued)




PorewaterChamber


PC-100'PC-100'PC-100'PC-100'PC-100'PC-100'PC-100'PC-100'PC-100'PC-100'PC-100'PC-100'

SampleDate

11/11/922/11/935/5/938/5/93

11/17/932/17/944/27/948/11/94

11/10/942/15/955/3/95

2/15/956/25/97

11/11/922/11/935/5/93

11/17/932/17/944/27/948/11/94

11/10/942/15/955/3/95

2/15/956/25/97

pH

7.096.547.166.916.887.517.266.506.997.306.706.546.99

7.076.697.026.937.337.257.377.077.416.756.587.13

SC

1840240027602350108017202300246025502140232029102580

222025002890137022002230256024102290210024102390

TDS

14801350176015801020800

1320221015601370172017501780

TOC

1610109

1099

101212102117

18101114119

111214101715

TSS

21

281726255

3440

1191

67532

COD

79

67648972637979

12211111513062

0&G

1

111111111121

As

0.01

0.010.010.010.010.010.010.010.010.130.01

0.0370.03

Cd

0.02

0.010.010.010.010.010.020.020.020.020.020.02

0.005

Ni

0.1

0.050.05

0.0540.050.050.01

0.10.10.10.10.1

0.04

CN

0.01

0.0050.014

0.020.010.010.010.010.020.010.010.010.01

Note:(1) - PC-10 is a flow weighted composite sample ofporewater chambers PC-1 through PC-9.

20-79M2948M.XLS

Table 4

Storm WaterIndicator and Water Quality Parameters Database



Indicator and Water Quality ParametersLocationNorth Storm Water

South Storm WaterSouth Storm Water

InorganicsLocationNorth Storm Water


Inorganics (continued)LocationNorth Storm Water


SampleDate

11/11/92

11/11/928/15/95

SampleDate

11/11/92

11/11/928/15/95

SampleDate

11/11/92

11/11/928/15/95

pH

7.81

7.977.32

Sb

0.2

0.20.025

H?

0.0005

0.00050.0005

SC

168

148126

As

0.01

0.010.01

Ni

0.05

0.050.02

TOC

6

68

Be

0.0005

0.00050.005

Se

0.005

0.0050.005

TSS

142

14439

Cd

0.01

0.010.005

Ag

0.01

0.010.005

COD

61

5221

Cr

0.02

0.020.01

TI

0.5

0.50.01

0&G

1

11

Cu

0.05

0.050.01

Zn

0.02

0.020.022

Pb

0.02

0.020.1

CN

0.005

0.0050.01

Figures

List of Figures

1 Monitor Well and Staff Gauge Locations: North Area Cap2 Monitor Well and Staff Gauge Locations: South Area Cap3 Potentiometric Surface Map - June 23, 1997: North Area Cap4 Potentiometric Surface Map - June 23, 1997: South Area Cap

400 800

SCALE FEET

ERM-Southwest, Inc.HOUSTON • NEW ORLEANS • AUSTIN • DALLAS • BEAUMONT

DESIGN: JMB | CHKD.: JMB | DATE: 08/07/9S | REV.:

FIGURE 2MONITOR WELL AND STAFF GAUGE LOCATIONS


Iberville Parish, Louisiana ERMDRAWN: MHS SCALE: AS SHOWN W.O.NO.: 2079A08H98

File InventoryAttachment 1

September 1992 - May 1998Bayou Sorrel Super fund SiteIberville Parish, Louisiana

BWALKER

Attachment 1

pre-1993

• Monitoring and Maintenance Report; Post-Construction Year 2, Fourth Quarter (4Q);• Ground Water Statistics Report, Post-Construction Year 2;• Second Semi-Annual Inspection and Maintenance Report, Post-Construction Year 2;• Remedial Investigation Report;• Record of Decision;• Feasibility Study Report; and• First Five Year Review Report.

1993

• Monitoring and Maintenance Report; Post-Construction Year 3, 1Q;• Monitoring and Maintenance Report; Post-Construction Year 3, 2Q;• Monitoring and Maintenance Report; Post-Construction Year 3, 3Q;• Monitoring and Maintenance Report; Post-Construction Year 3, 4Q;• Ground Water Statistics Report; Post-Construction Year 3;• First Semi-Annual Inspection and Maintenance Report; Post-Construction Year 3;• Second Semi-Annual Inspection and Maintenance Report; Post-Construction Year 3;• Letter to LDEQ from the Louisiana Department of Health and Hospitals (LDHH) Section of Environmental

Epidemiology (SEE) dated August 12, 1993, re: request for water well sampling assistance;• Letter from the LDHH to the Bayou Sorrel Community Assistance Panel Members dated August 2, 1993,

re: sampling activities.

1994

• Monitoring and Maintenance Report; Post-Construction Year 4, 1Q;• Monitoring and Maintenance Report; Post-Construction Year 4, 2Q;• Monitoring and Maintenance Report; Post-Construction Year 4, 3Q;• Monitoring and Maintenance Report, Post-Construction Year 4, 4Q• Ground Water Statistics Report, Post-Construction Year 4;• First Semi-Annual Inspection and Maintenance Report; Post-Construction Year 4; and• Second Semi-Annual Inspection and Maintenance Report; Post-Construction Year 4.

1995

• Monitoring and Maintenance Report; Post-Construction Year 5, 1Q;• Monitoring and Maintenance Report; Post-Construction Year 5,2Q;• Monitoring and Maintenance Report; Post-Construction Year 5,3Q;• Monitoring and Maintenance Report; Post-Construction Year 5,4Q;• Ground Water Statistics Report; Post-Construction Year 5;• First Semi-Annual Inspection and Maintenance Report; Post-Construction Year 5;• Second Semi-Annual Inspection and Maintenance Report; Post-Construction Year 5;• Letter Report from ERM to the USEPA dated December 6,1995, re: Regional Arsenic Ground Water

Information; and• Letter from John Mo (USEPA) to Dr. John Rauscher (USEPA) dated December 8, 1995, re: Bayou Sorrel

Arsenic Ground Water Information dated December 8, 1995.

20-79M2732M.DOC

1996

• Monitoring and Maintenance Report; Post-Construction Year 6;• Ground Water Statistics Report; Post-Construction Year 6;• First Semi-Annual Inspection and Maintenance Report; Post-Construction Year 6;• Second Semi-Annual Inspection and Maintenance Report, Post-Construction Year 6; and• Memorandum from EPA Office of Emergency and Remedial Response (OERR) dated July 31, 1996,

re: reducing federal oversight at Superfund Sites with cooperative and capable parties.

1997

• Monitoring and Maintenance Report; Post-Construction Year 7;• Ground Water Statistics Report; Post-Construction Year 7;• Second Semi-Annual Inspection and Maintenance Report; Post-Construction Year 7;• Letter to EPA from Jon D. Rauscher, Ph.D., Toxicologist dated January 15,1997,

re: Bayou Sorrel arsenic information• Draft Notice of Intent to Delete the Bayou Sorrel Superfund Site from the National Priorities List (NPL) dated

January 17, 1997;• Bayou Sorrel Site Close Out Report;• Porewater System Evaluation Update letter from ERM to the USEPA dated April 10,1997;• Letter to Ms. Tammy Guillotte (LDEQ) from Veme McFariand (USEPA) dated April 22, 1997,

re: Bayou Sorrel Superfund Site Deletion Docket;• Letter to Harold Moats (Chairman BSSC) from the USEPA dated June 4, 1997,

re: reduced oversight at Bayou Sorrel;• Letter to Stephen Tzhone (USEPA) from Glenn Miller (LDEQ) dated January 30, 1997,re: approval to remove the Site from the NPL• Notice of Intent to Delete the Bayou Sorrel Superfund Site from the NPL and request for comments, dated

June 4, 1997.• Notice of Deletion, Bayou Sorrel Superfund Site, dated September 29, 1997.

1998

• First Semi-Annual Inspection and Maintenance Report; Post-Construction Year 8; and• Letter from ERM to EPA dated March 20,1998, re: Notification of Porewater Irrigation System Burial.

20-79U2732M.DOC

Aerial PhotographsAttachment 2

June 1998Bayou Sorrel Superfund SiteIberville Parish, Louisiana

i-WVSS'^M''11-'1'"'?.!!.^. ". ...•l-lll'-l1;'' .1.;,. . 'H'': ",'. i;i ':1 : ' 1 ' : 1 ' ' ' •; "C''"-'1.1:1 f.111.!-!,1!!1'-^!*" .;; :1•!;':1^ •i 1 - 1 :';';'1"'» !̂ 'lll'lliIII"lll^ 1 1 H!11-.!1 ::i. ! !• A;:? I11 • 1 WSfll

BWALKER

Photograph #1: North and South Area CapsBayou Sorrel SiteJune 10, 1998

Photograph #2: North Area CapBayou Sorrel SiteJune 10, 1998

20-78\PHOTO.DOC

Photograph #3: South Area CapBayou Sorrel SiteJune 10, 1998

20-78\PHOTO.DOC

Responses To USEPA CommentsAttachment 3

July 1998Bayou Sorrel Super fund SiteIberville Parish, Louisiana

cjones

ATTACHMENTS

RESPONSES TO USEPA COMMENTS^SECOND FIVE YEAR REVIEW

BAYOU SORREL SUPERFUND SITE

General Comments

1. COMMENT: From the document text, it appears that the Site is well managed and does notpresent a threat to human health or the environment; however, there is nocorroborating data to support this position. Sufficient analytical data of thecontaminants of concern should be included to demonstrate the effectiveness ofthe remedial program.

Response: All corroborating storm water, porewater, and ground water data from the fourthquarter of post-construction year 2 through post-construction year 7 has been tabulatedand is provided as Tables 1-4. As we agreed for the Second Five Year Review, datafrom post-construction year 8 is not included in this summary.

2. COMMENT: Statement ofProtectiveness: signature block should read Myron 0. Knudson,P.E., Director, Superfund Division (on three lines)

Response: The text has been revised to incorporate this comment.

3. COMMENT: A Site map and Site figures showing the locations of monitoring wells, needs to beenclosed. The figures should also show the direction of ground water flow, thenatural drainage pathways, gradients across the caps, etc.

Response: Figures 1 and 2 illustrate the locations of the monitor wells. Figures 3 and 4 depict thedirection of ground water flow proximal to the north and south caps. Surface gradientson each cap promote sheet flow into perimeter drainage swales designed toaccommodate runofffrom rainfall events. These swales discharge directly (viaculverts installed beneath the Site access road) into the North and South Runoff Pondsillustrated on each of the aforementioned figures.

4. COMMENT: Figures 1 & 2 are missing.

Response: Figures 1 and 2 have been inserted to address this comment.

5. COMMENT: Under Section 1.3: "...this water table aquifer is not considered useable becauseof the low available yield and regional water quality". How was it decided thatthe Site ground water was not a potential source for domestic use?


6. COMMENT: Under Section 1.4: "Contamination of this aquifer by the Site appears veryunlikely due to the upward gradient of the Plaquemine". Is the Plaquemineupward gradient preventing contamination of the shallow aquifer? Earlier, thereport states that there is a 100' to 125' clay layer.


(1) Comments dated July 17, 1998.

20-79\ATT1.DOC

ATTACHMENTS

RESPONSES TO USEPA COMMENTS0)SECOND FIVE YEAR REVIEW

BAYOU SORREL SUPERFUND SITE

General Comments (Continued)

7. COMMENT:

Response:

8. COMMENT:

Response:

Under Section 2.0: Explain or clarify the statement "...and the natural upwardflow of the area ground water effectively mitigates the potential for the verticalmigration of waste."

The text has been revised to incorporate this comment.

Under Section 3.4: No discussion is made of any aquifers above the Plaquemine,except references to a 'saturated zone' from Section 1.3 (clarify language in bothsections). "The shallow ground water at the Site has a very limited potential forreceptors..." indicates that contaminants may be found in this shallow aquifer orsaturated zone? Are analytical data available from this shallow aquifer orsaturated zone?

The text in Sections 1.3 and 3.4 has been revised to incorporate this comment.

Ground water in the shallow saturated zone is analyzed in accordance with themonitoring requirements of the site-specific Sampling and Analysis Plan and is theonly transmissive zone above the Plaquemine aquifer. Results of the analyses reportedfrom the fourth quarter of post-construction year 2 through post-construction year 7 aresummarized in Tables 1 and 2.

(1) Comments dated July 17, 1998.

20-79\ATT1.DOC

Second Five-Year Review ReportAttachment 1: File InventoryAttachment 2: Aerial PhotographsAttachment 3: Responses to USEPA Comments

second five-year review reportsecond five year review report bayou sorrel superfund site iberville...

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