REVISED GROUNDWATER MONITORING PRO6.RAM

KIMBERTON, PENNSYLVANIA

(Previous Submission 17 May 1983)

GROUNDWATER TECHNOLOGY, INC.

(Ktt)

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[® GROUNDWATER TECHNOLOGYUS RT. 1 & PA RT. 1 00 • CHADDS FORD, PA 1 931 7 • 21 5-388-1 466 • TELEX 82-0245

REVISED GROUNDWATER MONITORING PROGRAM

KIMBERTON, PENNSYLVANIA

(Previous Submission 17 May 1983)

26 February 1985

Prepared for: Prepared by:

Mr. Benjamin G. Stonelake Frank AcetoBlank, Rome, Coraisky, & McCauley HydrogeologistFour Penn Center Groundwater TechnologyPhiladelphia, PA 19103

Mr. Bradford Whitman Raymond DuchaineDechert, Price, & Rhoads Hydrogeologist3400 Centre Square West ERM (formerly Groundwater1500 Market Street Technology)Philadelphia, PA 19102

CONSULTING GROUNDWATER GEOLOGISTS WITH OFFICES

TABLE OF CONTENTS

INTRODUCTION ........................................ Page 1- . - • • • •

WORK SCOPE .......................................... Page 2

WELL INSTALLATION ................................... Page 3

GROUNDWATER SAMPLING AND ANALYSIS ................... Page 5

DATA ANALYSIS AND INTERPRETATION .................... Page 7

LIST OF FIGURES

Figure 1: Site Map of Proposed Monitoring Well Locations

Figure 2: Well Construction: Competent Bedrock Conditions

Figure 3: Well Construction: Incompetent Bedrock Conditions

TABLE 1: Sampling Schedule and Analysis Parameters

INTRODUCTION(Refii

This document presents a finalized program of groundwater , ymonitoring to be conducted in Kimberton, Pennsylvania forMonsey Products Company and Ciba-Geigy Corporation. The worksteps described herein represent the combination of severalprevious proposals in a single, coherent program. During therecent meeting of 13 February 1985, this monitoring programwas met with mutual agreement by Monsey/Ciba-Geigy and thePennsylvania Department of Environmental Resources (D.ER). Inresponse to a request by DEP, a detailed summary of this programis presented herein.

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WORK SCOPE 0?,:•"•• .7.1(f>ti,

\J The purpose of this program is to provide comprehensiveassessment of groundwater and contaminant movement both with-in Monsey property limits and in the down gradient directionimmediately beyond the confines of Monsey Property. Toaccomplish this objective, the following tasks will beimplemented:

• Installation of thirteen monitoring wells (Figure 1).Seven of these wells will be installed on the sitepresently owned by Monsey Products in areas not pres-ently covered by the monitoring of existing on-sitewells (wells 1 through 4). The remaining six wellsare to be installed beyond the confines of Monseyproperty in areas selected for their structuralor down gradient significance relative to the Monseysite. All well locations have been mutually agreedupon by Monsey/Ciba-Geigy and DER via earlier meetingsand correspondence and during their meeting of 13February.

0 Implementation of a groundwater sampling and analysisprogram subsequent to the completion of monitoringwell installation.

• Interpretation of field and laboratory data to determinegroundwater flow patterns and actual or potential routesof contaminant plume migration.

Actual work steps for each of these tasks are outlinedin ensuing sections.

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WELL INSTALLATION

The following work steps and procedures will be implemented jrelative to installation of the thirteen additional monitoringwells noted previously: I

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1. Secure all necessary permits for monitoring wellinstallation. The process of obtaining individualproperty owner permission for off-site well instal-lation has been completed.

2. Finalize drilling arrangements with a competent,experienced well driller. It is currently antici-pated that P. L. Bollinger and Sons of Blue Pell,Pennsylvania will be contracted for well drillingand installation.

3. Review observation well locations in the field withthe well drillerr Honsey Products, individual proper-ty owners, and DER (should they so desire) to verify \^Jlocation and accessibility with all parties involved.

4. Install thirteen monitoring wells at locations shownon Figure 1. All wells will be installed under thedirection of a competent hydrogeologist. Two typesof well installations are anticipated. If competentbedrock conditions are encountered, the monitoringwell will be cased with six-inch (I.D.) steel casingto rock and left as an open hole below that point(Figure 2). If incompetent or unstable subsurfaceconditions are encountered, four-inch (I.D.), 0.02slotted PVC well screen will be installed to a mini-mum of ten feet above the static water table (Figure 3).All installed well screen will be appropriately gravel-packed and the resulting well annulus sealed with abentonite cap within five feet of the surface (Figure 3).

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On-site wells will be completed as above grade in-stallations. Off-site wells will be completed flushwith the existing ground surface via man-hole coversAll wells will have locking caps and be grout-sealedat the surface.

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5. Individual monitoring well depth will be a fielddetermination based on obtaining a saturated thick-ness within the well bore to gain a sufficient watersupply to adequately purge the water bearing zoneduring well development. It is currently anticipatedthat average well depth will be approximately 60 feet.Although significantly shallower depths to water may beencountered, no well shall be installed less than30 feet in depth.

6. The drill rig and all drilling-related equipment willbe steam cleaned between borings to preclude the possi-bility of equipment induced cross contamination.Drilling wastes will be disposed of in an appropriatemanner.

7. Pumping and purging of newly completed monitoringwells to ensure propeV development. This programcan proceed concurrently with well installation.

8. All wells will be vertically and horizontally lo-cated by field survey. Top of well casings will besurveyed to i 0.01 feet to develop elevation controlfor water table contouring.

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GPOUNDWATER SAMPLING AND ANALYSIS

The program of monitoring local groundwater conditionscombines field and laboratory procedures. Work steps involvedin this process are presented below.

1. Water quality sampling will be initiated withintwo weeks of completion of the monitoring wellinstallation program. This program will be com-pleted no later than 15 May. During the firstsix months of monitoring , four rounds of samplingshall be conducted after which quarterly samplingwill be performed. Intervals of sampling are pre-sented in Table 1.

2. Groundwater sampling points will consist of existingMonsey wells il through *4, Monsey's President'shouse well, and the thirteen new monitoring wellsto be installed under this program. Subsequent tothe first round of samples, well *1 will be deletedfrom the sampling program as other existing wells inthe immediate vicinity will provide representativesampling of the groundwater regime.

3. Samples are to be analyzed for volatile organic com-pounds, total dissolved solids, pH, and chlorides.Wells *2 and #7 will be analyzed for base neutralcompounds during the second and third round of samp-ling and yearly thereafter pending sample results.Analytical parameters are presented in Table 1. Itis currently anticipated that it may 'be possible toeliminate selected compounds from the analytical pro-gram should they be proven consistently non detectable.Similar adjustments may also prove possible with regardto the monitoring network.

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4. All samples from monitoring wells will be obtainedin accordance with EPA Manual of Groundwater SamplingProcedure (1981) to ensure that samples of representative aquifer quality are procured for analysis. Stti-bilization of specific conductivity and temperatureduring well pumping will be used to insure that suf-ficient water has been removed from the well boreprior to sampling.

5. Liquid level data will be collected from all avail-able monitoring points immediately prior to eachround of sampling and on a minimum monthly basis forthe purposes of water table fluctuation and gradientanalysis.

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DATA ANALYSIS AND INTERPRETATION

Upon initiation of data base compilation for thects site, the following progra

interpretation will be implemented:

. AProducts site, the following program of data analysis and (\&t) ^~

1. Construction of representative water table contourmaps to determine local groundwater gradient.

2. Upon receipt of analytical data, isoconcentrationmaps will be constructed for representative individ-ual or groups of compounds to determine dynamiccharacteristics of contaminant plume migration.Copies of all analytical da'ta will be forwarded toDER within three weeks of receipt.

3. Analysis of groundwater movement and contaminantmigration will be combined to interpret overallsite conditions.

4. All data and resulting analyses will be presentedto DER in an interim report. This report is to beprovided to DEP within six months of the completionof monitoring well installation. Recommendationsfor modification of the monitoring program will beincluded as needed. This interim evaluation willserve as a progress report and thus will not includerecommendations concerning ultimate site disposition.

5. A comprehensive report detailing the findings of thegroundwater monitoring program will be presented toDER after one full year of monitoring. This reportwill detail the dynamic changes of the contaminantplume and provide recommendations concerning furthersite activity.

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6. The documents noted in items 4 and 5 will be includedin a Remedial Investigation (RI) report which will be

I J prepared for DER subsequent to a minimum of one year's^' site monitoring.

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8

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A MONITORING WELLWELLS 1-4: EXISTING ON SITEWELLS 5-11 : PROPOSED ON SITEWELLS 12-17: PROPOSED OFF SITE

FK5URE , •—————5——^EXISTING 8 PROPOSEDMONITORING WELLSMONSEY/ CIBA-GEIGY l

SOURCE: USGS PHCCNtXVILLE , PA.DFMMA, PtNNA. QUADRANGLE ISCT BRBTECHNOLOGY

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FIGURE 2SCHEMATIC of a

MONITORING WELLfor

CONSOLIDATED GEOLOGIC FORMATIONS

-LOCKING CAP

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GROUND LEVEL-

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SOLID 4" OIA.PVC PIPE

4" DIA. PVCWELL SCREEN

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hi LOCKINO CAP ON TOP

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OF WELL CASING 6. BELOW GRADE

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BOTTOM CAP

FIGURE 3TYPICAL OBSERVATION WELL

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MONSEY PRODUCTS COMPANYKimberton, PA

TABLE 1 - SAMPLING SCHEDULE AND ANALYSIS PARAMETERS

Time FronDrillingCompletion

2 weeks

4 weeks

2 months

5 months

9 months

12 months

TimeFrom LastSampling

—

2 weeks

1 month

3 months

4 months

3 months

DateDeadline

15 May 85

29 May 85

1 July 85

1 Oct. 85

1 Feb. 86

1 May 86

Hells

MW *1 through *17,President's well

MW *2 through *17,President's well

Same as above

Same as above

To be decided

To* be decided

Parameters

Volatile organics, TDS, pH,chlorides

Volatile organics, TDS, pH,chlorides, base neutrals inwells *2 and #7

Volatile organics, TDS, pH,chlorides, base neutrals inwells 12 and *7

Volatile organics, TOP, pHchlorides

To be decided

To be decided

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