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GOLDBERGmiddot ZOINO amp ASSOCIATES INC CONSUL TING ENGINEI ltS GEOLOGISTS ENVtltONMENTA SCIE TISS

The GEO lluliJm~ no NeeJham Strelt l Newtun Urpet ~JII- 1gt Oll6~

March 10 1989 File No A-405433-CPC

A-405432-C

Mr James K RogersSilreaim Site Trust Suite U29 83 Parkhurst Road PO Box 2100 Chelmaford Massachusetts 01824

Re Additional Work Silresim RIFS

Dear Mr Rogers

This letter provides an update on our recent field activities at the Silresim site As you are aware we recently installed an additional bedrock monitoring well adjacent to existing well MWshy309 The purpose of this installation was to further evaluate the elevated volatile organic compound (VOC) levels reported in bedrock well MW-309-2 As part of this additional work we also reaampled a number of previously installed wells and further evaluated the hydraulic conductivity of the cement-bentonite grout aixture used as an annular seal for our well installations

FIELD ACTIVITIES

GZA Drilling Inc installed the new bedrock well (designatedMW-309-3) approximately 10 teet south of MW-309 between January 31 and February 10 1989 Drilling and installation aethoda were designed to preclude the potential tor cross contamination of deep soil and rock strata Flush joint casing was driven to advance the hole and a bentonite baaed drilling mud was used to flush cuttings from the hole Drill casing was seated on bedrock at 105 teet below ground surface and the hole was then flushed with clean tap water The bedrock was coreshydrilled to a depth of 15 teet (total depth of 120 teet below ground surface) with a 4-inch diameter double tube core barrel Ten teet ot 2-inch diameter PVC well screen was installed in the base ot the core hole and a silica sand filter placed around the screen The annular apace above the filter pack was backfilled with coapacted bentonite pellets high solids bentonite grout and nonahrink ceaent grout

Copyrightbull 1989 Goldberg-Zoino Associates Inc

middottn nbulln l I l l onu U IJn h bullbull 1 II ll1l1 hi I Ibull n IU l 1 IIUnll mrlbull I II II

GI

Mr James K Rogers - March 10 1989 File No A-405433 A-405432 Page 2

During the well installation program we resampled a number of existing wells including

GZA (Screening results are attached) This additional sampling

MW-311 MW-102A MW-315 MW-404 MW-318 MW-405 MW-318A MW-309-1 MW-502 MW-309-2 MW-414

Well MW-309-3 installation

was also sampled upon completion of the

samples were screened for voca and pHspecific conductance by

was directed at further evaluating VOC levels in bedrock monitoring walla and deeper overburden wells at the site Specific conductance and pH screening were used to evaluate the integrity of cement-bentonite grout seals in previously installed walla

We al8o directly evaluated the hydraulic conductivity of the cement bentonite grout in a laboratory permeameter A cement bentonite rout replicating our field mixture was prepared in a cylinder Groundwater from the moat highly contaminated portionof the site (Well MW-4058) ia being permeated through the groutsample in an ongoing evaluation of grout performance

our field program al8o included an evaluation of the possible presence of dense non-aqueous phase liquid (DNAPL) in moat of the aonitoring wells within and immediately north of the Silresim site Tranaparent PVC bottom check valve bailers were slowlylowered to the bottoa of each well then retrieved and observed for DNAPL DNAPL was observed in four of the 18 wells evaluated at thicknesses between 0 1 and 2 5 feet DNAPL survey reault s are auaariaed on Table 1 Approximately 6 inches of DNAPL was observed in well KW-309-3 upon completion of drilling operations

Results froa the newly installed bedrock well (MW-309-3)C)enerally correlate with recent data from MW-309-2 confirmingthe elevated voc levels in bedrock in this area Evaluation of peraeability t tin results on the qrout sample and pHspecificconductance screening resultbull do not indicate aeasurable deterioration of ceaent bentonite grout seals to date Baaed on these reaulta ve believe that the int8C)rity of the existing weU eala t the ait baa not n eo pro ia

GI

Mr James K Rogers - March 10 1989 File No A-405433 A-405432 Page 2

During the well installation program we resampled a number of existing wells including

GZA (Screening results are attached) This additional sampling

MW-311 MW-102A MW-315 MW-404 MW-318 MW-405 MW-318A MW-309-1 MW-502 MW-309-2 MW-414

Well MW-309-3 installation

was also sampled upon completion of the

samples were screened for voca and pHspecific conductance by

was directed at further evaluating VOC levels in bedrock monitoring walla and deeper overburden wells at the site Specific conductance and pH screening were used to evaluate the integrity of cement-bentonite grout seals in previously installed walla

We al8o directly evaluated the hydraulic conductivity of the cement bentonite grout in a laboratory permeameter A cement bentonite rout replicating our field mixture was prepared in a cylinder Groundwater from the moat highly contaminated portionof the site (Well MW-4058) ia being permeated through the groutsample in an ongoing evaluation of grout performance

our field program al8o included an evaluation of the possible presence of dense non-aqueous phase liquid (DNAPL) in moat of the aonitoring wells within and immediately north of the Silresim site Tranaparent PVC bottom check valve bailers were slowlylowered to the bottoa of each well then retrieved and observed for DNAPL DNAPL was observed in four of the 18 wells evaluated at thicknesses between 0 1 and 2 5 feet DNAPL survey reault s are auaariaed on Table 1 Approximately 6 inches of DNAPL was observed in well KW-309-3 upon completion of drilling operations

Results froa the newly installed bedrock well (MW-309-3)C)enerally correlate with recent data from MW-309-2 confirmingthe elevated voc levels in bedrock in this area Evaluation of peraeability t tin results on the qrout sample and pHspecificconductance screening resultbull do not indicate aeasurable deterioration of ceaent bentonite grout seals to date Baaed on these reaulta ve believe that the int8C)rity of the existing weU eala t the ait baa not n eo pro ia

01

Mr James K Rogers - March 10 1989 File No A-405433 A-405432 Page 3

Observations of significant quantities of DNAPL in well MW-4058 and the MW-309 cluster suggest that this material is the source of the elevated VOC levels in bedrock The bedrock elevation at well MW-309 is the lowest rock surface elevation measured within the study area Additionally a localized low point in the surface of the silty sandsandy silt unit which underlies the Silresim site appears to occur in the general area of well 309 These conditions suggest that the zone between wells 405 and 309 is a likely area for DNAPL to accumulate The absence of measurable quantities of DNAPL in other wells at the site mayindicate that significant quantities of this material are limited to the 405309 area1 the presence of isolated pockets of DNAPL in other portions of the site cannot be precluded however

This newly acquired data is being incorporated into the revised draft RI report Within that report we will present an assessment of the affects of DNAPL on contaminant migration at the Silresim site our previous evaluations of contaminant transport had assumed a continuous source of contamination at the site in simulating long-term pollutant migration Given this worst case assumption we presently believe that the new findingswill not dramatically altar our conclusions regarding migrationand potential impacts of groundwater contamination at the site While it is our opinion that sufficient data is available to proceed with the Feasibility study we recognize the need for additional study to evaluate potential collection and treatment options tor DNAPL recovery

Should you have any questions on the new information or requireadditional data please call

Very truly yours

GOLDBERG-ZOINO ASSOCIATES INC

~~~Charles A LindbergProject Manager

CALcrpAttachaenta Borin9 LocJ (MW-309-3)

voc 8creenin9 Results co Richard Cabaly

Lealie MoVickar OS BPA Nancy Bettift9er MA DBQB

~(I)01-43r 1-40 ZITI1-4(1)(1)1-4-43 0 ~0 -41 1-4111 lt3 1111-4

0 0~ 111r 0 00 00 00

0

0

TABLE 1

DNAPL SURVEY RESULTS

DLL I PATE 12HAEL lHlSIWE~~ MW-101A 21589MW-1018R 21589MW-1028 21789MW-105A 21789MW-1058 21789

MW-301 21589MW-302 21589MW-303 21589MW-3068 21589MW-308A 21589MW-3098 21089MW-3098 21589MW-309A 21589MW-309-3 21089MW-309-3 21789

MW-4048 21589MW-405 21589MW-4058 21589MW-412 21589

NO NO NO NO NO

NO NO NO NO NO

25 feet 01 feet 02 feet 05 feetI 05 feet6

NO NO

08 feet NO

1 ONAPL - Dense Non-Aqueous Phase Liquid

2 NO - None Detected

3 - 05-inch floating layer observed

4 ONAPL thicknesa aeasured vith a transparent PVC bailer lowered to the bottobull of the well Thickness observed in bailer aay not represent actual ONAPL thickness

5 Idiately after wall installation

6 After wall devalopntpurqinq

~(I) OM ~r MQ ZITI M(l)(I)M-t3 u ~0 -tX MIT lt3 ITIM

0 ~jt0 00

~i 0

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JOB 1 A-405433 60LDBER8-l01110 ASSOCIATES DATE SAifLED1 21989 320 IEEDHA STREET DATE TESTED1 V1089 IIEIITOIIIIPER FALLS 11A

02164 (517) 969-0050

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IMIPIpound IIAIIE1 111middot502 (1) 111middot502 (2) 111middot502 (3) IIUIIIID IDETECTION

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-------- -middot-middotmiddot-- shy

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02164 (517) 969-0050

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IMIPIpound IIAIIE1 111middot502 (1) 111middot502 (2) 111middot502 (3) IIUIIIID IDETECTION

m LAlla 1 19324-611 19325-611 19326-amp11 I LIIIIT ----------- middot----------------------- shy1 TETIampCilaTIEIE 0010 2 TIICII1IIITIIIE 0010 3 111-IICIUIIETIIEIE 0010 4 TOTAL 112middot

IICILraTIIIO 0010 5 VIm CIIDIJIE 0010

0050middot IETIIfLpoundII CllliiiE

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----------------------------------------middot------------------shylJAaliE 10 11 llllftL tTIIIl ur 010

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- -----------middot------ - -middot shy

JOB It A-4054 33 81lDIERNDIII ASSOCIATES DATE SAifiEDt 2889 320 IIEEIIWI STREET DATE TESTEDt 21989 10101 UPPER rAm lA

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IICIIramplliEIES 039 oo~o 5 VIm CILIIIIIE 027 0010

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2 Tllaumamp 0010 1-4111 3 111-IICIUIIIlamp 0010 ltI

1111-4 4 TOTAL 112shy n

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5 VIm Clllllll Trace Trace t010 n

6 IETIIYUJE CliIIIIE 0050 on QO

7 111-li1CIIaTIIIE 0010 0~

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A-405433 IUIOI-10111 AIBIATU ()

bullbullbulllATE IAIIPWI 1125ft 320 IIDIIAII STIpoundET lATE TESTOa 112789 Ellla IIPER FALLS IIA

02164 (517) t-0050

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7 111-lll-nlll 092 015 29 115 r bullI lllO

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112 1110

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02164 (517) t-0050

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7 111-lll-nlll 092 015 29 115 r bullI lllO

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1bullbull 112 Trect

112 1110

ama I 111 Trect 11 117 tlll

m1 bullbullbullbullbull u-21 77 Ill 12

ftlt-tir) LS 14 m IM - (I) w w fr-t (U) - (4)

--------~---~-~-

I the 6ZR r~~~td acreentng technique for volettlt org~~~lcs tn 111ttr ntiNtn aqueous ccentretians of thett ~ fron gaseous COIICtfttretlw IIIIIWH in eir Ml the le Dtaaolyenet ualetilt orllftiCI we drilltft fron the 111ttr plllse ~ equilibrating et an elt~~~ted tllftlltln 1n a htnltttc ayst111 centetntng tile lt end cleen etr In lltquat of tile equtltlnted heldtpece 1111 ts injected tiltbull tht dlrwtbull- te routbull en Mluetton of the quality of the 111ttr Je lhts nethod his been liMloped by the 6ZR Uwlronntntll Chelutry Lretory 11 a r111td lllllllllly ecct~rate end rtltlblt end cost effective screening of 111ttr SIIIPlts for lable orton~ca IIMyener this ttcllntque II nat bullftnittue end 11 nat en EPA lfllloued tyttcal nethod

lllttr lH tae~~ ta tht field we pleced 1n ill 111 11111 ~e~~t111 vteh ftlled te C1111Clt9 t ~ to etel-e etr Wlblu Uslls ore bullet et 4 ~ Cto pmerve the -ple until tile tine of -lysis b IIPOIilll tht Je for nlysts 1 vole ratio of 11 le to htMtpece ltirl 11 creeted by discording 10 111 of _le ltreIICed by etrl fr111 the ill 11l vi1l or trlllfmilll 75 II to I 11111 cru-t vtll lhe vtll II raeeled end lated tt 48 IH Cin I Mnlntlticll)y trilled Mtll I 11111 lltq~~~t 1f ~ 111 11 withdrawn Mllllly uith bull IVinae or atlllltically ~ 1 ilellett Pecbrd ms ~ iiiJtctor Ihe laapect a~~~le II injected into the e art of I bull SNI c~~rt where the UlpO(

u fht w1 tb1n tht iajectlen port t dtatri_ed to two 30 neter X510 llicran fUied siltce Cllllllory cel~M Clantnttn ~fI elut1111 little OIJIRita we ed llith Ml flene tlllimtton bulltectors end rtlfiMf bullte ore qlired by a bullhanlnalyttcel 1M Serin llltellt~e~~t IaterfiCt lilt dnlatot-~c bullt we trttted tt en Ill 11 U Clllllllter end nlfftd urilll the bullhbull llllllytCIIl Ml Seriu Onllttopllly Softe the tnfornatton for tilt bulllytlcll re1rt 11 entered tty 111to a lotus sbllly ~t

lilt of tile 111 clnllt-h II Cllli~1Ud llitb eaternll rillda prepered for ct~~Ctt~traUons of 11 18 llld 1Q 11911 ltbullgt 111111~ tate tht clnllt 11 ~ ln ta tilt 1111e 11 water Itt Sle peeks ere lettfled ClllfOIilll tlldr retetlttbull tJMI f Mth cat te a retenUbull bntt of Cllltnhan ltM-dl for botheel htetlw ClllfOIi_ we- llttllftll the t bullb of tnt bullt far eedl le Sle Ifillbull ~fled as k1101111 ~ we Ufled ICCiriile te ~ flttln bulltntlled f Cllltlnttbull -

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1M Rl ~_ tlilt relflllt flaquotn we tilt_ tilt tiJI flllt tf II tt II tilt til -tdnlllof bull far -IH II tilt - bull tAM for tilt calUnti111 lilt 1151 cat 1 ts far bull 1 ere

fbull 11 a ar bull bull ~ bull Stlatbull t test bull f1 Cite 1111- tf cel1nllbull It n1 art J lt --t- If tilt rtletilt ailtia of tbt ~ fetter IS

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ldenbtin llld concentrations of ualattle organic c~s reported by thu hetdct screening technique are ~ject to linitiUons tnhlfent to this Mthod If confin~~tion u desired diiJhcate ~M~Jlts sllould be 11butted to a State certified llllorator~ for 11111~1 by the IWIPIiltt poundfR protocol Mthods

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