INTERIM MONITORING AND SAMPLING REPORT 2bedrock during the completion of the final Remedial Investigation Repor (Rt I Report; BBL, June 1998). Surface-water quality in the Quinnipiac

BBTBLASIAND BOUCK amp LEE INCengineers Ascientists

Transmitted Via FacsimileUS Mail

August3 1999

Mr Byron MahUSEPA Region IJFK Federal Building (HBT)Boston MA 02203-0001

Re SRSNE Site - Southington ConnecticutInterim Monitoring and Sampling Report No 2Project 102808331 2

Dear Mr Mah

This letter serves as Interim Monitoring and Sampling (IMS) Report No 2 for the Solvents RecoveryService of New England (SRSNE) Superfund Site in Southington Connecticut (Figure 1) This lettersummarizes the results of the second interim monitoring and sampling (IMS) event which Blasland Bouckamp Lee Inc (BEL) completed at the SRSNE Site on May 17 to 21 1999 The May 1999 IMS eventincluded ground-water sampling at 25 monitoring wells and surface-water sampling at three locationsalong the Quinnipiac River These biannual sampling locations were identified in the final IMS Plan(IMSP BBL November 1998) Two supplemental monitoring wells were also resampled as requestedby the United States Environmental Protection Agency (USEPA) and the Connecticut Department ofEnvironmental Protection (CT DEP)

Introduction

The primary purpose for IMS is to monitor the nature and extent of the plumes of dissolved volatile organiccompounds (VOCs) associated with the SRSNE Site until the issuance of the Record of Decision (ROD)The VOC plumes were delineated in the shallow middle and deep overburden and the shallow and deepbedrock during the completion of the final Remedial Investigation Report (RI Report BBL June 1998)Surface-water quality in the Quinnipiac River was also characterized during the completion of the RI TheIMS is required by the Administrative Order on Consent (AOC) to detect any temporal changes in theplume dimensions which may influence the appropriateness or location of the remedial technologiesconsidered in the Feasibility Study (FS) or selected as part of the ROD In addition sampling is performedto assess temporal ground-water quality trends within the interior of the plumes Lastly surface-watersampling is included to confirm the interpretation that VOCs associated with the site do not adverselyimpact surface-water quality within the Quinnipiac River

Background

The IMS locations and methods were described in the final IMSP which BBL prepared on behalf of theSRSNE Site Potentially Responsible Parties (PP) Group and submitted to the USEPA and CT DEP onNovember 24 1998 The final IMSP addressed USEPA comments presented in letters dated October 11998 and October 30 1998 and addressed USEPA conditions for IMSP approval as presented in theUSEPA letter dated October 30 1998 The final IMSP included a total of 25 biannual ground-watersampling locations which are shown on Figures 2 through 6 and three surface-water sampling locationsshown on Figure 7 Two additional supplemental wells were also resampled in May 1999 as shown onFigures 2 and 5

6723 Towpath Road bull PO Box 66 bull Syracuse NY 13214-0066Tel (315) 446-9120 bull Fax (315) 449-0017 bull wwwbbl-inccom

Offices Nationwide

Mr Byron Mah Augusts 1999

The remainder of this letter summarizes ground-water and surface-water sampling and the analytical results from the May 1999 IMS event

Ground-Water Sampling

On May 17 to 21199925 ground-water samples (not including the associated quality assurancequality control [QAQC] samples) were obtained at the following locations

bull Shallow overburden monitoring wells mdash MWL-312 P-13 and P-101C (Figure 2)

Middle overburden monitoring wells - CW-B-77 MW-3 MW-127B MW-205B MW-501B and P-10IB (Figure 3)

Deep overburden monitoring wells ~ CW-4-75 MW-4 MW-204B MW-502 MW-704D and MWshy707D (Figure 4)

Shallow bedrock monitoring wells - MW-127C MW-128 MW-204A MW-205A MW-501A and P-llA(Figure5)and

bull Deep bedrock monitoring wells - MW-703DR MW-704DR MW-706DR and MW-707DR (Figure 6)

In addition to the 25 biannual EMS locations listed above supplemental ground-water samples were obtained during the May 1999 sampling event per USEPA request Supplemental ground-water samples were obtained at monitoring wells MW-801S (Figure 2) and MW-801R (Figure 5) As requested by USEPA and CT DEP BBL also attempted to sample monitoring well CW-2-78 (Figure 4) however the well contained no water above an obstruction at approximately 178 feet below the reference point at the top of the riser pipe or approximately 150 feet below ground surface Thus BBL was unable to sample well CW-2-78 in May 1999

With the exception of well CW-2-78 BBL sampled all of the wells listed above between May 17 and 21 1999 for analysis of VOCs by Contract Laboratory Program-Routine Analytical Service (CLP-RAS) Methods Ground-water sampling documentation preservation handling shipment and analysis were performed in accordance with the procedures specified in the USEPA-approved Project Operations Plan (POP BBL August 1996) Each sampled well was purged prior to sampling following traditional procedures (ie until three to five well volumes were removed or until the well was purged dry and then allowed to partially or fully recharge prior to sampling) Well purging was accomplished using a decontaminated submersible (Grundfos or Whale ) pump with polyethylene tubing or an inertia (Waterratrade) pump with high density polyethylene tubing Ground-water samples were submitted to Galson Laboratories (Galson) of East Syracuse New York for analysis of Target Compound List (TCL) VOCs via CLP-RAS (1092 Low Concentration Organics in Water including ketones and tetrahydrofuran) In accordance with the POP QAQC samples were also obtained and shipped to Galson for analysis including trip blanks field duplicates rinse blanks matrix spikes and matrix spike duplicates The analytical results from these samples are listed along with historical monitoring results from the same wells in Table 1 The new analytical results from these wells are also depicted in regulatory VOC plume maps on Figures 2 through 6 These figures are based on similar plume maps presented in die final RI Report and EMS Report No 1 (BBL February 17 1999) with slight modifications to reflect the additional May 1999 analytical results and further data interpretation

Surface-Water Sampling

Three surface-water samples were obtained on May 17 1999 at locations SW-C SW-F and SW-G as shown on Figure 7 The surface-water sampling procedures described in detail in RI Work Plan Addendum No 6 (BBL December 16 1996) were consistent with the surface-water sampling methods

BLASLAND BOUCK amp LEE INC

engineers amp scientists

previously implemented by HNUS (May 1994) Each sample was obtained using a new dedicated certified-clean glass sample collection jar (40 milliliter [mL] volatile organic analyte [VOA] vial) Each sample was transferred from the sample collection jar into appropriate sample vials and shipped to Galson for analysis of TCL VOCs by CLP-RAS Methods QAQC samples were also obtained and shipped to Galson for analysis includinga trip blank field duplicate matrix spike and matrix spike duplicate The new and historical analytical results from these sampling locations are summarized in Table 1 and on Figure 7

Analytical Results

The analytical results of the ground-water and surface-water samples obtained during the May 1999 IMS event are listed in Table 1 and summarized on Figures 2 through 7 The only VOCs detected in the rinse blanks or trip blanks obtained during the May 1999 IMS event were common laboratory contaminants as follows

bull Rinse blanks mdash methylene chloride detected at concentrations of 1 to 2 micrograms per liter (ugL) (and also detected in the associated laboratory method blank) and

bull Trip blanks mdash methylene chloride detected at concentrations of 2 to 4 ugL and acetone detected in one trip blank at 15 ugL these compounds were also detected in the associated laboratory method blanks

The key findings from the ground-water and surface water sample results are discussed below

Ground Water

In general the ground-water analytical results from the May 1999 IMS event indicate relatively steady VOC concentrations near the edges of the regulatory VOC plumes The regulatory plumes were initially delineated in the final RI Report based on ground-water sampling performed between November 1996 and February 1997 Figures 2 through 6 show the current delineation of the regulatory plumes based on the May 1999 ground-water analytical results and further data interpretation

At the 25 biannual monitoring locations the following concentration changes are noted versus the concentrations reported in the final RI Report (also see Table 1)

bull 14 wells indicated lower total VOC concentrations in May 1999 bull 4 wells indicated negligible (ie less than 10 percent) change in total VOC concentrations (MWshy

703DR MW-706DR MW-707D and MWL-312) and bull 7 wells indicated slightly higher total VOC concentrations in May 1999 (CW-4-75 MW-3 MWshy

204B MW-205B MW-502 MW-707DR and P-13)

At the two supplemental sampling locations shown on Figures 2 and 5 (monitoring wells MW-801S and MW-801R respectively) where low concentrations of VOCs were detected in NovemberDecember 1998 no VOCs were detected other than low concentrations of laboratory contaminants (2 ugL methylene chloride also present in the laboratory method blank)

Figures 2 through 6 depict the regulatory VOC plumes in the five monitored hydrostratigraphic intervals These figures are based on similar maps presented in the final RI Report with appropriate modifications to reflect the May 1999 sampling results and further data evaluation The May 1999 data indicate that the VOC plumes in the shallow middle and deep overburden have not grown in the downgradient (south-southeast) direction in the approximately two-and-a-half year period since the final RI sampling event (Figures 2 3 and 4) The VOC plumes in the shallow and deep bedrock have decreased in their extent since the final RI sampling event (Figures 5 and 6) The current plumes are generally consistent with the assumptions used as a basis for the draft FS Report (BBL November 1998)

BLASLAND BOUCK amp LEE INC engineers amp scientists

Mr Byron Mah August 3 1999

During the completion of the RI natural attenuation of dissolved VOCs was demonstrated within each of the five monitored hydrostratigraphic zones (BBL June 1998) While the May 1999 sampling event did not generate new data regarding biologic or geochemical indicators of natural attenuation such parameters were characterized in detail in during the completion of the RI Degradation daughter compounds continue to be observed in the ground-water analytical data from the site Among the degradation products detected in May 1999 were 1) vinyl chloride which is a product of more highly chlorinated alkenes and degrades further to ethene 2) chloroethane which is a product of more highly chlorinated alkanes and degrades further to ethane and 3) several other higher-order breakdown products The following noteworthy examples of degradation were observed in May 1999

bull Low concentrations of chloroethane and vinyl chloride detected at middle overburden monitoring well MW-3 which is the furthest downgradient monitoring well within the overburden regulatory plumes

bull Chloroethane detected at monitoring well MW-704D which is near the leading edge of the deep overburden regulatory plume

bull Chloroethane detected at deep bedrock monitoring well MW-704DR which is the furthest downgradient monitoring well within the deep bedrock regulatory plume and

bull Chloroethane or vinyl chloride at wells P-11 A P-101B and P-101C which are located within the interior of the plumes

In addition to natural attenuation ground-water hydraulics are likely helping to limit the downgradient extent of the VOC plume in the bedrock As described in the final RI Report the vertical component of the hydraulic gradient within the bedrock beneath the Town of Southington Well Field Property is generally upward as ground water discharges upward from the bedrock to the overburden and eventually discharges to the Quinnipiac River (BBL June 1998) The upward migration of deep bedrock ground water causes the deep bedrock plume to migrate upward into the shallow bedrock and from the shallow bedrock into the overburden within the Town Well Field Property This interpretation continues to be supported by the decrease in the downgradient extent of the shallow and deep bedrock plumes since the sampling and analysis conducted for the RI

At the wells situated in the interior of the plumes VOC concentration changes were variable since the final RI sampling event Total VOC concentrations have decreased at wells P-101B P-101C and P-l 1A and increased at well MW-502 At well MW-706DR negligible net change has occurred in the total VOC concentration since the completion of the RI The highest total VOC concentration in the data set 62000 ugL was detected at middle overburden monitoring well MW-502 During the completion of the RI this well was interpreted as being situated in close proximity to non-aqueous phase liquids (NAPLs) in the saturated overburden The May 1999 IMS data continue to support this interpretation

In May 1999 BBL also sampled monitoring well cluster MW-801 which was installed to determine whether Trichloroethylene (TCE) detected during the RI at deep overburden monitoring well CW-2-78 in the southwestern portion of the Town of Southington Well Field Property is related to the SRSNE Site (Figure 4) No VOCs were detected at overburden and bedrock wells MW-801S and MW-801 R respectively with the exception of 2 ugL of methylene chloride which was also detected in the associated laboratory method blank Based on these results and the absence of TCE at these wells during the NovemberDecember 1998 IMS event the TCE detected at well CW-2-78 is not attributed to activities at the SRSNE Site During a conference call on June 30 1999 USEPA agreed that the contamination detected at well CW-2-78 is not currently attributable to the SRSNE Site During this call CT DEP concurred that the contamination at well CW-2-78 is not attributed to the release(s) at the SRSNE Operations Area

Similarly the middle overburden plume map has been corrected to show a separate VOC plume at wells CW-6-75 and CW-1-78 in the southwestern portion of the Town Well Field Property (Figure 3) The middle overburden plume is coincident with the deep overburden plume in this area and using the rationale applied to the deep overburden plume at well CW-2-78 is not attributable to the release(s) at the SRSNE Site In addition the shallow bedrock regulatory plume map has been revised to indicate a separate regulatory VOC plume not attributable to releases at SRSNE This other plume was detected at monitoring well MW-129 located approximately 1200 feet upgradient (northwest) of the SRSNE Site Operations Area The data that define these separate middle overburden and shallow bedrock plumes were obtained during the completion of the RI but were inadvertently not labeled as regulatory plumes in the final RI Report

The results listed above indicate that since the completion of the final RI Report the size of the VOC plumes related to the SRSNE Site have remained relatively consistent or have diminished Based on these findings we recommend that the main biannual ground-water sampling network remain the same through the fall 1999 IMS event The supplemental results from the MW-801 cluster demonstrate that the VOCs detected at well CW-2-78 are not related to the SRSNE Site No further sampling is proposed at wells CWshy2-78 MW-801S or MW-801R

Surface Water

The surface water analytical results from sampling locations SW-C SW-F and SW-G indicated no VOC detections except for 1 to 2 ugL of methylene chloride which was also detected in the associated laboratory method blank These data confirm previous surface-water sampling results indicating little or no VOC impact to surface-water quality in the Quinnipiac River east of the SRSNE Site These same three surface-water sampling locations (SW-C SW-F and SW-G) are proposed for further sampling in fall 1999

Schedule

The next biannual IMS event is currently scheduled for the week of October 25 through 29 1999 The results of the October 1999 sampling event will be presented in IMS Report No 3 which is currently scheduled to be submitted to USEPA by January 12 2000

We trust this information meets your needs If you have any questions please do not hesitate to call Mr Bruce Thompson of de maximis inc at (860) 651-1196

Sincerely

Gary R Cameron Vice President

MJGGRCmbl Enclosures X COMMONMBIAM090M2 WPD

cc Al Klinger USEPA Mike Beskind CT DEP Liyang Chu Tetra Tech NUS SRSNE Technical Committee Bruce R Thompson de maximis inc Edward R Lynch PE Blasland Bouck amp Lee Inc Michael J Gefell PO Blasland Bouck amp Lee Inc

BLAfeLAND BOUCK amp LEE INC engineers amp scientists

bcc Donald F Sauda Blasland Bouck amp Lee Inc

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