SDM S DocI D 24430 2



# Ne w Englan dDistric t U S Arm y Corp s o f

Engineer s USAG EContrac t

No

. W912WJ-05-C-000 5

TWENTY-EIGHT H GROUNDWATE RMONITORIN GREPOR T

NORWOO D PC B SUPERFUN D SIT E 

### Norwood , Massachusett s June/Jul y 200 5 Monitorin g Even t

n dRecord s Cente r

S'TF. : Prepare db y OTHER: ,



# "I t TETRATEC H EC

. IN C

13 3 Federa l Street , Boston , M A0211 0

an d



# WATERMAR K
10 0 Foo t o f Joh nStreet , Lowell , M A0185 2

## Ne w Englan dDistric t U S Arm y Corp s o f

Engineer s USAG ECONTRAC T NO

. W912WJ-05-C-000 5

TWENTY-EIGHT H GROUNDWATE RMONITORIN GREPOR T

NORWOO D PC B SUPERFUN D SIT E Norwood , Massachusett s June/Jul y 200 5 Monitorin g Even t

Prepare dfo r U.S

. Arm y Corp s o f

Engineer s Ne w Englan dDistric t Concord , Massachusett s

Prepare db y Tetr aTec hEC , Inc

. 13 3 Federa l Stree t Boston , M A 0211 0

an d
Watermar k

Environmental , Inc

. 10 0 Foo t o f Joh nStree t Lowell , M A 0185 2

Revisio nDat e Prepare dB y Reviewe dB y Approve dB y Page s Affecte d 0 9/30/0 5 K

. Craigie , J

. Scaramuzz o J.Hale y Al l 1 4/04/0 6 O

. Westphale nJ.Hale y J

. Hale y Al l

TDOJ-00 6 Apri l 21X1 6

### TABL EO FCONTENT S

EXECUTIV ESUMMAR Y ES- 1 1. 0 INTRODUCTIO N1- 1 2. 0 FIEL D INVESTIGATIO NPROGRA M 2- 1 2. 1 Monitorin g Wel l Gaugin g an dMonitorin g Wel l Samplin g 2- 1 2. 2 Groundwate r

Monitorin g 2- 1 2. 3 Wel l Repair s an dMaintenanc e 2- 1 2. 4 Sedimen t

an dSurfac e Wate r

Samplin g 2- 2 3. 0 FIEL D AN D HYDROGEOLOGICA LDAT AANALYSI S 3- 1 3. 1 Fiel dPhysica l an dChemica l Dat a3- 1 3. 2 Wate r

Leve l Elevation s an dGroundwate r Flo w 3- 1 4. 0 ANALYTICA LRESULT S 4- 1 4. 1 Compariso nt o Regulator y Criteri a4- 1 4. 2 Laborator y Analysi s Method s 4- 1 4. 3 Evaluatio no f

Laborator y QA/Q C Dat a4- 2 4. 4 Volatil e Organi c Analyse s 4- 2 4.4. 1 Compariso nt o Standard s 4- 3 4.4. 2 Volatil e Contaminan t Distribution s 4- 3 4. 5 Semivolatil e Organic s 4-1 0 4.5. 1 Compariso nt o Sit e Cleanu p Standard s 4-1 2 4.5. 2 Semivolatil e Contaminan t Distribution s 4-1 2 4. 6 PCB s 4-1 2 4.6. 1 Compariso n t o Standard s 4-1 4 4.6. 2 Contaminan t

Distributio n4-1 4 4. 7 Inorganic/Meta l Analyse s 4-1 4 5. 0 SUMMAR Y DISCUSSIO N5- 1 5. 1 Hydrogeologica l Investigatio nProgra m5- 1 5. 2 Analytica l Result s 5- 1 5.2. 1 Trend s i nGroundwate r Volatil e Dat a5- 1 5.2. 2 Trend s i nGroundwate r Semivolatil e Dat a5- 1 5.2. 3 1,2,4-Triehlorobenzen e Migratio n5- 4 5.2. 4 Trend s i nPC B Dat a5- 4 5. 3 Compariso nwit hPreviou s TC V Extractio nWel l Dat a5- 7 5. 4 Compariso nwit hPreviou s Monitorin g Wel l Dat a- Plum e Migratio n5- 7 5.4. 1 Upgradien t

Wester nSit e Area s 5- 7 5.4. 2 Downgradien t

Sit e Area s 5-1 3 5. 5 Compariso no f

Chlorinate dHydrocarbo nProduct-Daughte r Mol e Rati o Dat a5-1 6 5. 6 Chlorinate dVolatil e Trend s a t Wel l MW-1 A5-1 6 5. 7 Implication s o f

Cessatio no f

GWT POperation s 5-1 6 5.7. 1 GWT PMas s Remova l 5-1 8 6. 0 CONCLUSION S AN D RECOMMENDATION S 6- 1 7. 0 REFERENCE S 7- 1

TD03-00 6 Apri l 200 6

### TABL EO FCONTENT S - Con t ' d

LIS T O FFIGURE S Figur e 2- 1 Monitorin g Well , Extractio nWel l an dPiexomete r Locatio nMa p 2- 3 Figur e 3- 1 Groundwate r Contou r Ma p (Overburden ) 3- 2 Figur e 3- 2 Groundwate r Contou r Ma p (Bedrock ) 3- 3 Figur e 4- 1 Groundwate r TC V Contou r

Ma p (Overburden ) 4- 4 Figur e 4- 2 Groundwate r TC V Contou r

Ma p (Uppe r

Overburden ) 4- 5 Figur e 4- 3 Groundwate r TC V Contou r

Ma p (Shallo w Bedrock ) 4- 6 Figur e 4- 4 Groundwate r TC V Contou r

Ma p (Shallo w Bedroc k

an dLowe r

Overburden ) 4- 7 Figur e 4- 5 Chlorinate dVolatil e Hydrocarbons

- Product-Daughte r Mol e Rati o 4-1 1 Figur e 4- 6 Groundwate r PC B Contou r

Ma p (Overburden ) 4-1 5 Figur e 5- 1 1,2,4-Trichlorobenzen e Concentration s a t Wel l MW-1 A5- 3 Figur e 5- 2 PC B Trend s i nUppe r Overburde nWell s 5- 5 Figur e 5- 3 Extractio nWel l TC V Concentration s 5- 9 Figur e 5- 4 Extractio nWel l Chlorinate dVolatil e Distributio n5-1 0 Figur e 5- 5 Extractio nWel l TC V Trend s 5-1 1 Figur e 5- 6 Trend s i nNorther nSit e Area s 5-1 4 Figur e 5- 7 Downgradien t Plum e Trend s 5-1 5 Figur e 5- 8 Chlorinate dVolatile s Trend s a t Monitorin g Wel l MW- 1 A 5-1 7 Figur e 5- 9 Trend s i nTC V Mas s Remova l an dGallon s Treate db y Sit e Extractio nWell s 5-1 9

LIS T O FTABLE S Tabl e 4- 1 Targe t

Compound s fo r

Norwoo dPC B Superfun dSit e Groundwate r 4- 2 Tabl e 4- 2 Frequenc y o f Volatil e Organi c Detection s 4- 3 Tabl e 4- 3 Frequenc y o f Semivolatil e Organi c Detection s 4-1 2 Tabl e 4- 4 Frequenc y o f PC B Detection s 4-1 3 Tabl e 4- 5 Monitorin g an dExtractio nWell s Filtere dan dUnfiltere dPC B Result s ((.ig/L ) 4-1 3 Tabl e 4- 6 Piezomete r Filtere dan dUnfiltere dPC B Result s (|_ig/L ) 4-1 3 Tabl e 5- 1 Compariso no f TC V Extractio nWel l Result s (|-ig/L ) 5- 8 Tabl e 5- 2 Compariso no f TC V Monitorin g Wel l Result s (ug/L ) 5-1 2

LIS T O FAPPENDICE S Appendi x A Summar y o f Groundwate r

Samplin g Fiel dDat a Appendi x B Laborator y Analytica l Dat a Appendi x C QA/Q C Dat aRevie w Appendi x D Summar y o f Wel l Repai r

an dMaintenanc e Activitie s Appendi x ESedimen t an dSurfac e Wate r

Samplin g Result s

TD03-00 6 Apri l 200 6

### ACRONYM S AN D ABBREVIATION S

° C degree s centigrad e |.ig/ Lmicrogram s pe r lite r uS/c mmicrosiemen s pe r centimete r 1,2-DC E1,2-dichloroethen e 1,2,4-TC B 1,2,4-trichlorobenzen e D O dissolve doxyge n EP A U.S

. Environmenta l Protectio nAgenc y GWT Pgroundwate r treatmen t plan t MADE PMassachusett s Departmen t o f Environmenta l Protectio n MC PMassachusett s Contingenc y Pla n MO M Managemen t o f Migratio n m V millivolt s NAP Lnon-aqueou s phas e liqui d NT U nephelometri c turbidit y uni t OR Poxidation-reductio npotentia l PC B polychlorinate dbipheny l PC Etetrachloroethen e Q A Qualit y Assuranc e Q C Qualit y Contro l REA LRis k

Base dActio nLeve l RO D Recor do f Decisio n Sit e Norwoo dPC B Superfun dSit e SO Pstandar doperatin g procedur e SVO C semivolatil e organi c compoun d TC Etrichloroethylen e TC Ltarge t

compoun dlis t TC V targe t

chlorinate dvolatile s TtE C Tetr aTec hEC , Inc

. USAG EU.S

. Arm y Corp s o f Engineer s VO C volatil e organi c compoun d Watermar k

Watermar k

Environmental , Inc

.

TD03-00 6 Apnl200 6 11 1EXECUTIV ESUMMAR Y

Watermar k

Environmental , Inc. , unde r contrac t wit hth e Unite dState s Arm y Corp s o f Engineer s (USAGE ) - Ne w Englan dDistrict , an di ncooperatio nwit hTetr aTec hEC , Inc

. (TtEC) , ha s performe da groundwate r

monitorin g even t

a t th e Norwoo dPC B Superfun dSit e (Site)

. Thi s repor t summarize s th e result s o f th e 28 t hmonitorin g even t conducte di nJune/Jul y 2005

. Th e 28 t hgroundwate r

monitorin g even t

involve dth e collectio nan danalysi s o f 3 1 monitorin g wel l samples , nin e extractio nwel l samples , an dfou r piezomete r

samples

. I naddition , on e surfac e wate r an d on e sedimen t

sampl e wer e collected

. Monitorin g an dextractio nwell s ar e locate dacros s th e Sit e an dar e screene di nbot hoverburde nan dbedroc k horizons

. Piezometer s ar e locate ddirectl y adjacen t t o Meado w Broo k o nth e northeaster nedg e o f th e Site

. Wate r

leve l measurement s continu e t o generall y indicat e eas t t o northeas t

flo w direction s i nth e overburde naquifer , an dagenera l flo w directio ntoward s th e eas t i nth e bedroc k aquife r wit hasoutheas t

component

. I t

shoul db e note dtha t

th e groundwate r

extractio nsyste m ha s bee n shu t

dow nsinc e Jun e 2000

. Laborator y analytica l dat afo r th e curren t

monitorin g even t

ar e generall y consisten t

wit hresult s observe d durin g th e 27 t hmonitorin g even t whic hoccurre di nOctobe r 2002

. I nFebruar y 2005 , a n Explanatio no f Significan t

Difference s (ESD ) wa s publishe dwhic hpresente dRis k Base dActio nLevel s (RBALs ) fo r VOCs , Semivolatil e Organi c Compound s (SVOCs) , an dPCBs

. Curren t groundwate r

dat afro msit e monitorin g wells , extractio nwells , an dpiezometer s meet s th e RBALs

. Sinc e RBAL s hav e bee nme t an dgroundwate r

qualit y ha s stabilized , additiona l groundwate r remediatio ni s no t

likel y needed

. Nevertheless , groundwater , surfac e wate r an dsedimen t

qualit y shoul d continu e t o b e monitore dt o verif y tha t curren t sit e condition s remai nstabl e o r improve

.

TD03-00 6 ES- 1 Apri l 200 61. 0 INTRODUCTIO N

Watermar k

Environmental , Inc

. (Watermark ) i s unde r contrac t t o th e Unite dState s Arm y Corp s o f Engineer s (USAGE ) t o perfor mth e 28 t hgroundwate r monitorin g even t

a t th e Norwoo dPC B Superfun d Sit e (Site)

. T o addres s th e migratio no f dissolve dcontaminant s a t th e Site , agroundwate r

extractio nan d on-sit e physical-chemica l treatmen t syste mwa s installe di n199 5 an doperate dbetwee nearl y 199 6 an d Jun e 2000

. I nsuppor t o f thes e remedia l actions , agroundwate r monitorin g progra mconsistin g o f hydrogeologica l investigation s an dgroundwate r chemica l analysi s wa s implemente dbetwee n Apri l 199 6 an dOctobe r

2002

. Th e baselin e componen t o f th e monitorin g program , a s wel l a s th e firs t 2 7 monitorin g event s hav e bee ncomplete dan dth e result s previousl y describe d(Foste r Wheeler , 1996a,b,c ; 1997a,c,d,e,f ; 1998a,b,c,d ; 1999a,b,c,d ; 2000a,b,c,d ; 2001a,b ; Nobi s Engineerin g Inc

. 2001a,b ; 2002a,b,c ; 2003)

. Not e tha t groundwate r

cleanu p level s wer e originall y base do ndrinkin g wate r criteri aa s presente di nth e 198 9 Recor do f

Decisio n(ROD)

. Supplementa l ris k assessmen t

activitie s wer e performe dfro m200 1 t o 200 4 afte r i t wa s determine db y th e U.S

. Environmenta l Protectio nAgenc y (EPA ) an dth e Massachusett s Departmen t

o f Environmenta l Protectio n(MADEP ) tha t drinkin g wate r

criteri awer e no t

consisten t

wit h curren t an dfutur e sit e use . Thes e supplementa l ris k assessmen t

activitie s include dth e installatio no f piezometer s an dadditiona l soil , sediment , an dsurfac e wate r samplin g i n2004

. Th e ris k assessmen t

i s summarize di nareport entitle dPhas e I I Ecologica l an dHuma nHealt hRis k Summar y Report (Jul y 2004)

. Subsequently , a nExplanatio no f Significan t

Difference s (ESD ) wa s publishe di n Februar y 200 5 whic hpresente drevise dgroundwate r cleanu p level s referre dt o a s Ris k Base dActio n Level s (RBALs)

. I naddition , th e ES D describe dth e completio no f "a nadditiona l roun do f

groundwate r monitorin g befor e th e en do f 2005. " Tha t

"additiona l round " wa s complete di nJun e an dJul y 200 5 a s th e 28 t hmonitorin g event

. Th e finding s o f th e 28 t hmonitorin g even t ar e th e subjec t

o f thi s report

. A s state d i nth e ESD , th e objective s o f thi s 28 t hmonitorin g even t ar e to :

• furthe r

asses s th e hydrologica l impact s sinc e th e shutdow no f th e groundwate r

treatmen t

plan t (GWTP ) i nJun e 2000 ; an d

• determin e whethe r

an y additiona l (future ) groundwate r remediatio nwil l b e necessary . I f th e result s o f th e monitorin g lea dth e EP A t o determin e tha t additiona l activ e groundwate r extractio n an dtreatmen t

i s no t necessary , th e GWT Pwil l b e decommissioned

. Sectio n2. 0 o f

thi s report

identifie s th e component s o f th e fiel dinvestigatio nprogram . Sectio n3. 0 present s th e result s o f

th e hydrogeologica l wate r leve l evaluations

. Sectio n4. 0 present s th e result s o f th e chemica l analysi s program . Sectio n5. 0 summarize s th e result s o f th e hydrogeologica l an dchemica l analysi s program s an dconsider s implication s fo r th e Managemen t

o f Migratio n(MOM ) program . Sectio n6. 0 present s th e conclusion s an drecommendation s wit hrespec t t o th e objective s above

. Sectio n 7. 0 provide s alis t

o f references

. Appendi x A present s supportin g fiel ddat aan dinformatio no n groundwate r

sampling

. Appendi x B contain s th e comprehensiv e laborator y analytica l data

. Appendi x C present s th e result s o f

th e QA/Q C revie w o f

th e laborator y data

. Appendi x D provide s asummar y o f wel l repai r an dmaintenanc e activities

. Appendi x Eprovide s th e sedimen t an dsurfac e wate r

samplin g results

.

TD03-00 6 1- 1 Apri l 200 62. 0 FIEL D INVESTIGATIO N PROGRA M

T o implemen t

th e 28 t h(June/Jul y 2005 ) monitorin g event , afiel dinvestigatio neffor t consistin g o f

wel l gaugin g an dgroundwate r samplin g wa s performed

. Monitorin g well , extractio nwell , an dpiezomete r samplin g location s ar e show no nFigur e 2-1

. Th e fiel dinvestigatio nwa s performe db y technica l staf f fro mWatermar k

i naccordanc e wit hth e Qualit y Assuranc e Projec t Pla n(QAPP ) Addendum , Fina l Groundwate r

Monitoring , Norwoo dPC B Superfun dSite , Norwood , Massachusetts , Ma y 2005

. I n addition , mino r

wel l repair s an dmaintenanc e activitie s wer e performe dan dsediment/surfac e wate r sample s wer e collecte dfo r analyse s a s requeste db y th e USAGE

. 2. 1 Monitorin g Wel l Gaugin g an dMonitorin g Wel l Samplin g Monitorin g wel l gaugin g wa s performe do nJul y 13 , 2005

. Th e Sit e ha s 3 6 monitorin g wells , 9 extractio n wells , an d4 piezometer s fo r gaugin g wate r

level s and/o r

sampling

. Th e followin g summarize s th e result s o f th e gaugin g an dsampling :

• Forty-thre e (43 ) monitorin g well s an dextractio nwell s wer e gauge dfo r wate r levels

. MW-3I Rwa s no t gauge dsinc e th e roadbo x wa s ful l o f wate r o nth e da y o f

th e synchronou s wate r

leve l round

. MW-5 A wa s no t

gauge dsinc e i t

i s pave dover , an dth e wate r level s i npiezometer s PZ- 1 throug hPZ

4 wer e no t

gauge dsinc e thei r

elevation s wer e no t

surveyed ; an d

• Forty-fou r

(44 ) monitorin g wells , extractio nwells , an dpiezometer s wer e sampled

. Sample s wer e no t collecte dfro mmonitorin g well s MW-5A , MW-5B , MW-6A , MW-6 B an dB-2 8 sinc e thes e monitorin g well s ar e n o longe r sample da s part

o f th e monitorin g progra mpe r USAG Einstructions

. A summar y o f

Groundwate r

Samplin g Fiel dDat ai s include di nAppendi x A

. 2. 2 Groundwate r

Monitorin g Thi s monitorin g even t

wa s conducte dt o continu e t o monito r th e ambien t

groundwate r

condition s followin g th e GWT Pshutdown

. Thi s 28 * (June/Jul y 2005 ) monitorin g even t include dcompletio no f

on e groundwate r

monitorin g event

. A tota l o f 4 4 groundwate r

sample s (obtaine dfro m9 extractio nwells , 3 1 monitorin g wells , an d4 piezometers ) wer e collecte dbetwee nJun e 1 an dJul y 13 , 2005

. Th e mos t recen t even t prio r t o thi s even t

wa s performe di nOctobe r 200 2 (Roun d27)

. Al l monitorin g wel l sample s wer e collecte di naccordanc e wit hth e EP A Regio nI Lo w Stres s (lo w flow ) Purgin g an dSamplin g Procedur e (SO P#GW0001 , Jul y 30 , 199 6 Revisio n2)

. A summar y o f Groundwate r

Samplin g Fiel dDat ai s include di nAppendi x A

. 2. 3 Wel l Repair s an dMaintenanc e I naccordanc e wit hcontrac t W912WJ-05-C-0005 , Watermar k performe dwel l repai r

an dmaintenanc e activitie s includin g th e following :

• PV C riser s wer e trimme do n 1 0 wells ;

• Expansio nplug s wer e replace do n 1 6 wells ; an d

• Wel l cover s and/o r

bolt s wer e replace do n 1 6 wells

. A summar y o f

wel l repai r

an dmaintenanc e activitie s i s provide di nAppendi x D

.

TD03-00 6 2- 1 Apri l 200 62. 4 Sedimen t an dSurfac e Wate r

Samplin g On e sedimen t

sampl e an don e surfac e wate r sampl e wer e collecte dfro mMeado w Brook

. A descriptio n o f sedimen t an dsurfac e wate r

samplin g activitie s i s include di nAppendi x E

.

TD03-00 6 2- 2 Apri l 200 6WEL L SCHEDUL E

NOTE : BAS E PLA N WA S PRODUCE D B Y METCAL F & EDD YINC

. AN D MODIFIE D BYFOSTE R WHEELE R ENVIRONMENTA L CORP

. O N 6/26/9 6 AN D NOBI S ENGINEERIN G O N 1/3/02

. Wel lB4B9 B-1 0 B-1 8 B-19 R B-2 8 MW-1 A MW-1B R MW-1 C MW-2 A MW-2 B MW-3A R MW-3 B MW-3I R MW-4 A MW-4 B MW-5 A MW-5 B MW-6 A MW-6 B MW-7 A MW-7 B MW

—7 0 MW-8 I MW-9 BME2ME3ME4ME5ME8ME9 ME-1 0 ME-11 A ME-11 B ME-12 A ME-12 B ME-18 BEW4EW5EW8EW9 EW-1 0 EW-1 1 EW-1 6 EW-1 7 EW-1 8 PZ-0 1 PZ-0 2 PZ-0 3 PZ-0 4 Screene d

Interva l _JdefiiQ

_ 5-1 5 7-2 2 5-1 5 9-2 4 5-2 0 5-1 5 5-1 5 20-3 0 66-7 6 4.5-14. 5 33-3 8 4-1 5 _aa=ia

_ 33-3 8 7-1 2 37-4 2 _^i,7-9. 7 92-10 2 7.7-17. 7 88.5-93. 5 8.7-18. 7 33.4-43. 4 80-9 0 56.4-61. 4 28.5-38. 5 17-2 2 25-4 5 24-4 4 5.5-10. 5 12-2 2 69-7 9 5-1 5 15-2 5 11.8-21. 8 10.5-20. 5 6.1-16. 1 23-4 3 8.5-13. 5 13-1 8 30.5-45. 5 31-5 1 21.5-31. 5 21-3 1 19-2 9 19-2 9 31-5 1 3- 4 3- 4 3- 4 3- 4 Stratu m

Uppe rOverburde n Uppe rOverburde n Uppe rOverburde n Uj>pe rOverburde n Uppe rOverburde n Uppe rOverburde n Uppe rOverburde n Lowe rOverburde n Lowe rBedroc k Uppe rOverburde n Shallo wBedroc k Uppe rOverburde n Shallo wBedroc k Lowe rOverburde n Uppe rOverburde n ShallowBedroc k Uppe rOverburde n Shallo wBedroc k Uppe rOverburde n Dee p Bedroc k Uppe rOverburde n Shallo wBedroc k ues a Bedroc k Lowe rOverburde n Shallo wBedroc k Lowe rOverburde n Shallo wBedroc k Shallo wBedroc k Uppe rOverburde n Shallo wBedroc k Dee p Bedroc k Uppe rOverburde n Shallo wBedrock/Lowe rOverburde n ShallowBedrock/Lowe rOverburde n Shallo wBedrock/Lowe rOverburde n Shallo wBedrock/Lowe rOverburde n Shallo wBedroc k Uppe rOverburde n Uppe rOverburde n Shallo wBedroc k Shallo wBedroc k Lowe rOverburde n Lowe rOverburde n Lowe rOverburde n Lowe rOverburde n Shallo wBedroc k Overburde n Overburde n Overburde n Overburde n U S Arm yCorp s o f Engineer s Ne wEnglan d District



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### 3.0 FIEL D AND HYDROGEOLOGICA LDAT A ANALYSI S

3. 1 Fiel dPhysica l an dChemica l Dat a Durin g th e lo w flo w samplin g process , physica l an dchemica l dat aincludin g wate r level , specifi c conductivity , turbidity , temperature , pH , oxidation-reductio npotentia l (ORP) , an ddissolve doxyge n(DO ) wer e collecte dfo r

eac hmonitorin g wel l an dar e include di nAppendi x A

. Groundwate r specifi c conductivit y level s range dfro m15 5 microsiemen s pe r centimete r

(uS/cm ) (MW-3B ) t o 86 6 jaS/c m (EW-5)

. Turbidit y value s range dfro m0. 1 nephelometri c turbidit y unit s (NTUs ) (EW-17 ) t o 1,167. 8 NTU s (ME-3)

. Groundwate r temperature s range dfro m12. 0 degree s centigrad e (°C ) (ME-12A ) t o 25.8°C

. (B-19R)

. Not e tha t th e highe r

temperature s ar e likel y associate dwit hambien t temperature s warmin g th e flow-throug hcel l and/o r th e pump . Groundwate r

p H level s range dfro mp H 1. 7 (EW-17 ) t o p H 8. 1 (MW-7C)

. Not e tha t th e lowe r

p H value s ar e suspec t

sinc e the y wer e belo w th e dail y calibratio n rang e an dinconsisten t

wit hhistori c data

. Th e caus e o f th e lo w value s ma y hav e bee nheat-related

. Groundwate r

OR Plevel s range dfro m-26 7 millivolt s (mV ) (EW-10 ) t o 68 7 m V (B-18)

. Groundwate r D O level s range dfro m0. 2 mg/ 1 (P2-2 , EW-11 , EW-10 , ME-8 ) t o 10. 6 mg/ I (PZ-4)

. Not e tha t despit e som e o f th e anomalou s value s recorde dfo r som e o f th e wate r

qualit y parameters , al l parameter s di d stabiliz e prio r

t o sampl e collection

. 3. 2 Wate r

Leve l Elevation s an dGroundwate r Flo w Wel l gaugin g dat acollecte do nJul y 13 , 200 5 wer e entere dint o acompute r spreadshee t

t o calculat e th e groundwate r

level s fo r

bothth e overburde nan dbedroc k aquifers

. Th e spreadshee t use s surveye dcasin g reference s provide db y th e USAG Ea s amende db y Nobi s i n2002

. Fo r selecte dmonitorin g well s (B-4 , B-9 , MW-1A , MW-3AR , MW-31R , MW-4A , ME-8 , an dME-10) , PV C elevation s wer e correcte db y Watermar k

t o accoun t

fo r wel l repair s a s describe di nSectio n2.3

. Overburde ngroundwate r elevation s wer e measure dbetwee n39. 5 fee t a t monitorin g wel l ME-12 A t o 48.2 8 fee t

a t monitorin g wel l MW-6A

. Bedroc k groundwate r

elevation s wer e measure dbetwee n 43.7 8 fee t a t monitorin g wel l MW-9 B t o 50.3 7 fee t a t monitorin g wel l MW-5B

. Figure s 3- 1 an d3- 2 presen t potentiometri c surfac e map s fo r th e overburde nan dbedroc k aquifers

. Th e overburde n potentiometri c ma p illustrate dth e elevatio no f th e wate r tabl e usin g dat acollecte dfro mwell s screene di n th e overburden

. Similarly , th e bedroc k wate r elevatio nma p illustrate s th e elevatio no f th e wate r tabl e i n th e well s screene donl y i nbedrock

. Monitorin g well s ME-11A , ME- 1 IB , ME-12 A an dME-12 B straddl e th e lowe r overburden-shallo w bedroc k interfac e an dar e screene dacros s bothformations

. Give nth e mor e fracture dnatur e o f

th e uppe r bedrock , an dth e presume dhydrauli c connectio nt o th e lowe r aquifer , thes e well s wer e considere da s overburde ndat apoint s fo r plottin g potentiometri c maps . I ncase s wher e awel l cluste r ha s tw o well s screene di nth e sam e formatio n(eithe r bedroc k o r overburden) , a narithmeti c averag e o f

th e measurement s wa s use dt o prepar e th e contou r map . Th e elevation s i nth e followin g wel l cluster s wer e averaged : MW-3A Ran dMW-3IR , MW-1B Ran dMW- 1 A , an dMW-7 B an dMW-7C

. Th e overburde ncontou r

ma p illustrate s th e sit e groundwate r flo w predominatel y t o th e eas t towar d Rout e 1 an dMeado w Broo k wit hanortheas t

componen t

radiatin g toward s Meado w Broo k i nth e norther n portio no f th e Site

. Th e bedroc k

groundwate r

contou r map depict s groundwate r flo w generall y t o th e eas t wit hasoutheas t

componen t

southwes t

o f th e forme r

Gran t Gear building

. Th e overburde nan dbedroc k groundwate r

flo w direction s ar e generall y consisten t wit hprio r

monitorin g results

.

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### FIGUR E 3- 2 Shee t 1 o f 14. 0 ANALYTICA LRESULT S

Th e groundwate r

monitorin g even t

complete di nJune/Jul y o f 200 5 i s th e firs t

groundwate r

samplin g a t th e Sit e sinc e th e 27 thmonitorin g even t complete di n Octobe r

2002

. I n 2004 , fou r

piezometer s wer e installe dalon g th e sit e sid e o f Meado w Brook

. Thes e piezometer s wer e installe du s par t o f th e Meado w Broo k investigatio n t o determin e th e sourc e o f PCB s foun di n th e broo k sediment s an dsurfac e wate r downstrea man dint o th e Neponse t River

. Th e constructio n o f thes e piezometer s i s differen t tha n th e monitorin g well s a t

th e Sit e i n man y respects includin g th e lac k o f asan dpac k

aroun dth e screen . Therefore , th e result s fro mth e piezometer s ma y no t b e directl y comparabl e t o thos e fo r th e monitorin g well s an dextractio n wells

. However , th e reade r shoul db e awar e tha t

piezomete r

result s ar e include di n th e discussio n belo w fo r

th e 28 thmonitorin g event

. Thi s sectio n summarize s th e result s o f th e groundwate r

off-sit e laborator y analysi s program . Th e targe t compound s tha t

were analyze di n th e groundwate r monitorin g well s ar e presente di n Tabl e 4-1

. Th e associate dcomprehensiv e analytica l dat atable s ar e presente di n Appendi x B

. Thi s sectio n discusse s th e result s o f th e groundwate r

analyse s o n achemica l clas s b y clas s basi s (i.e. , volatiles , semivolatiles , an dPCBs ) fo r th e targe t

compound s whic hwer e analyzed

. Include dar e evaluation s o f

contaminan t

distributions , chemistry , an dmigratio n patterns

. Th e lis t o f targe t compound s whic hhav e bee n analyze di s base do n th e targe t lis t identifie di n th e Groundwate r Monitorin g Plan

. Th e result s fo r

th e sedimen t

an dsurfac e wate r

samplin g activitie s ar e include di n Appendi x E

. 4. 1 Compariso n t o Regulator y Criteri a Th e 198 9 RO D specifie dgroundwate r cleanu p levels

. A s discusse dearlie r i n Sectio n 1.0 , ne w RBAL s wer e develope da s summarize di n th e Phas e I I Ecologica l an dHuma n Healt hRis k Summar y Report (Jul y 2004)

. Th e RBAL s wer e publishe di n th e ES D i n Februar y 2005

. Th e RBAL s ar e provide di n Tabl e 4-1

. 4. 2 Laborator y Analysi s Method s Laborator y analyse s o f

th e groundwate r

samples wer e performe db y Severn Tren t Laborator y (Colchester , Vermont)

. Analyses wer e performe daccordin g t o EP A SW-84 6 reference dmethod s an dar e consisten t wit hrequirement s o f

th e QAPP

. Th e principa l analytica l method s whic hwer e utilize dar e summarize da s follows :
Paramete r

Volatil e Organic s Semivolatil e Organic s Pesticide/PCB s Techniqu e GC/M S GC/M S GC/EC D Method s

Extractio n 5030 B 3510/3520 351 0 Analysi s

8260 B 8270 C 808 2
I naccordanc e wit hUSAG Edirection , n o analysi s fo r metal s wa s performe ddurin g thi s samplin g round

.

TD03-00 6 Apri l 200 6 4- 1Tabl e 4- 1 Targe t Compound s fo r

Norwoo dPC B Superfun dSite Groundwate r Targe t Compoun d Ris k Base dActio nLevel s (RBALs): 1 Groundwate r Cleanu p Standard s (mg/L ) Volatil e Organi c Compound s (VOCs ) 1,2-Dichloroethen e (total ) 1 , 1 ,2,2-Tetrachloroethan e Tetrachloroethen e 1 , 1 ,2-Trichloro e than e Trichloroethylen e Viny l chlorid e Chlorobenzen e 3,66 0 N E 3 7 N E 10 8 31 0 N E Semivolatil e Organi c Compound s (SVOCs ) 1 ,2-Dichlorobenzen e 1 ,3-Dichlorobenzen e 1 ,4-Dichlorobenzen e Pentachloropheno l 1 ,2,4-Trichlorobenzen e N E N E 4. 6 N E 3 4 Polychlorinate dBiphenyl s (PCBs ) Tota l PCBs N E Notes : N E- No t

Establishe d 1 EP ARegio nI Explanatio no f Significan t

Difference s fo r

th e Norwoo dPC B Superfun d Site , Norwood , MA , Februar y 23 , 2005

. 4. 3 Evaluatio no f

Laborator y Q A/Q C Dat a Th e laborator y QA/Q C dat afo r th e groundwate r

analyse s wer e independentl y reviewe db y Tetr aTec h EC' s chemistr y staff

. Th e result s o f thi s QA/Q C revie w ar e presente di nAppendi x C an dsummarize d here

. A s part

o f thi s review , laboratory QA/Q C information , includin g dat ao n holdin g times , blan k an d duplicat e analyses , surrogates , an dmatri x spik e recoveries , wer e examine dfo r adherenc e t o EP A SW-84 6 metho drequirement s an drelate dEP A guidance

. However , thi s revie w di dno t includ e detaile devaluatio n o f al l laborator y QA/Q C dat awhic hwoul db e performe di namor e comprehensiv e EP A Regio nI Tie r II I dat avalidation

. Th e result s o f

th e QA/Q C revie w indicate dthat , althoug hsevera l mino r Q C exceedance s wer e noted , th e overal l dat ase t

i s generall y satisfactor y an dacceptabl e fo r projec t use . Several result s fo r VOCs , SVOCs , an dPCB s wer e qualifie dwit h(J ) o r (UJ ) primaril y du e t o matri x spike , surrogat e recovery , calibration , an dlaboratory contro l sampl e inconsistencies

. Wher e appropriate , dat aqualifier s resultin g fro mthi s QA/Q C dat arevie w hav e bee ninclude di nth e analytica l dat atable s presente di nAppendi x B

. 4. 4 Volatil e Organi c Analyse s Thi s sectio nsummarize s th e result s o f th e groundwate r

targe t volatil e organi c analyses

. Th e overal l result s fo r

th e ful l suit e o f

groundwate r

volatil e organi c analyse s ar e presente di nAppendi x B

. Volatil e organi c dat ahav e bee ncompare dt o RBAL s an dals o evaluate dwit hrespec t t o contaminan t

distribution s an denvironmenta l chemistry

. I t shoul db e note dtha t

i ncomparin g an dsummin g groundwate r VO C (an dothe r

organic ) data , non-detecte dvalue s hav e bee ntreate da s zer o concentratio nvalues

. Durin g graphica l chemica l contourin g o f

groundwate r

data , concentratio nvalue s wer e converte dt o lo g values

. Therefore , zer o concentratio nvalue s wer e treate da s 10 ° = 1 ng/L

. Als o not e tha t th e discussio nbelo w include s th e

TD03-00 6 Apri l 200 6 4- 2piezometers ; previou s report s di dno t discus s th e piezometer s sinc e the y wer e recentl y installed

. Thi s affect s frequenc y o f

detectio n summarie s an dcontou r maps . 4.4. 1 Compariso n t o Standard s Thi s sectio n compare s th e observe dgroundwate r volatil e organi c concentration s t o sit e cleanu p standard s (RBALs)

. Groundwate r dat aar e presente di n Appendi x B

. Th e frequencie s o f detectio n o f

chlorinate d volatile s ar e summarize di n Tabl e 4-2

. Include di n Tabl e 4-2, ar e th e maximu mdetecte dconcentration s o f chlorinate dvolatile s an dth e associate dwel l location

. 4.4.1. 1 Sit e Cleanu p Standard s Groundwate r

cleanu p standard s (RBALs ) hav e bee n establishe dfo r fou r targe t volatil e organic s includin g trichloroethylen e (TCE ) (10 8 mg/L) , tetrachloroethen e (PCE ) (3 7 mg/L) , viny l chlorid e (31 0 mg/L) , an d tota l 1,2-dichloroethene s (1,2-DCE ) (3,66 0 mg/L)

. Tabl e 4- 2 present s asummar y o f targe t VO C frequenc y o f

detection , numbe r

o f sample s exceedin g th e RBA Lgroundwate r cleanu p standard , an d maximu mdetecte dconcentration

. Overall , th e detectio n frequencie s fo r VOC s durin g th e mos t recen t monitorin g even t

varie dsomewha t

fro mthos e observe ddurin g th e previou s monitorin g event

. N o VOC s exceede dth e RBALs

. Tabl e 4- 2 Frequenc y o f

Volatil e Organi c Detection s

Analyt e Chlorobenzen e cis-l,2-Dichloroethen e trans

- 1 ,2-Dichloroethen e 1 ,2-Dichloroethen e (total ) Tetrachloroethen e 1 , 1 ,2-Trichloroethan e Trichloroethylen e Viny l Chlorid e RBA L Cleanu p Leve l (mg/L ) N E N E N E 3,66 0 3 7 N E 10 8 31 0 Numbe r

Sample s Exceedin g Cleanu p Leve l N A N A N A 0 0 N A 0 0 200 5

Detectio n Frequenc y 5/4 4 25/4 4 15/4 4 25/4 4 1/44 1/4 4 21/4 4 18/4 4 200 2

Detectio n Frequenc y 4/4 0 28/4 0 13/4 0 28/4 0 4/4 0 3/4 0 26/4 0 20/4 0 Maximu m

Detecte d Concentratio n (mg/L ) 0.0 3 2. 0 0.1 5 2. 3 0.0004 3 0.03 1 2. 6 0.1 2 Associate d

Sampl e Locatio n B- 4 EW- 9 EW- 9 EW- 9 ME-12 A EW-1 1 EW-1 1 ME-11 A Notes : A tota l o f

4 0 well s (extractio nan dmonitoring ) an d4 piezometer s wer e sample ddurin g th e 200 5 groundwate r monitorin g event

. Th e piezometer s wer e no t sample di n2002

. Fiel dduplicates , tri p blanks , an ddilute dsample s wer e no t include di nth e frequenc y calculations

. N E- No t

Established : N A - No t Applicabl e 4.4. 2 Volatil e Contaminan t Distribution s A revie w o f

th e comprehensiv e dat ase t presente di n Appendi x B indicate s tha t groundwate r

volatil e organi c contaminan t

level s ar e quit e variabl e acros s th e Site

. Th e dat aha s bee n considere di n term s o f tota l chlorinate dvolatil e organi c trend s an dals o trend s fo r individua l volatil e constituents

. 4.4.2. 1 Targe t

Chlorinate dVolatile s Th e targe t

volatil e compoun dlis t fo r Sit e groundwate r

(Tabl e 4-1 ) consist s primaril y o f chlorinate d compound s (trichloroethylene , dichloroethene , etc.)

. Figure s 4- 1 throug h4- 4 illustrat e th e overal l plum e contour s fo r

tota l chlorinate dvolatile s (TCV ) define da s th e su mo f th e concentration s o f

th e targe t chlorinate dvolatil e organi c compound s (liste di n Appendi x B)

. Figur e 4- 1 provide s a n overal l characterizatio n o f

TC V contaminatio n i n overburde n groundwater

. Figur e 4- 2 illustrate s th e contour s fo r TC V i n uppe r

overburden

. Figur e 4- 3 present s TC V plum e contour s fo r shallo w bedrock

. Figur e 4- 4 present s composit e TC V contour s fo r lowe r overburde n an dshallo w bedrock

.

TD03-00 6 Apri l 200 6 4- 3U S Arm yCorp s o fEngineer s Ne wEnglan d Distric t

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upo nth e well s an dpiezometer s sample da s identifie di nAppendi x A

. Fo r simplicity , th e dat ahav e bee n presente da s acombinatio no f colore dcontours

. Thes e contou r line s shoul db e treate da s graphica l estimates , whic hinherentl y contai nsom e uncertainty

. Thi s i s particularl y tru e i narea s wher e fe w samplin g location s exist

. I npreparin g Figure s 4- 1 throug h4-4 , al l o f th e extractio nwell s hav e bee ndepicte do neac hfigure

. Thi s ha s bee ndon e t o b e consisten t wit hth e practic e i npreviou s report s whe nth e GWT Pwa s i noperatio nan d th e extractio nwel l operatio nma y hav e influence dplum e contours

. Bot huppe r an dlowe r

overburde n monitorin g well s an dpiezometer s ar e show nfo r th e overburde ncontour s (Figur e 4-1)

. Onl y uppe r overburde nwell s an dpiezometer s ar e use dfo r developin g Figur e 4- 2 an donl y bedroc k well s ar e show n o nth e shallo w bedroc k

plum e (Figur e 4-3)

. I naddition , i neac hfigure , well s an dpiezometer s use dfo r developin g th e contour s ar e presente di nbold

. Fo r simplicity , i ncomposit e Figur e 4- 4 onl y thos e lowe r overburde nan dshallo w bedroc k well s use dfo r

contourin g ar e included

. I t shoul db e note dtha t

fou r monitorin g well s (ME-11A , ME- 1 IB , ME-12A , an dME-12B ) ar e screene dacros s bothlowe r overburde n an dshallo w bedrock

. Therefore , t o maximiz e consistenc y betwee nth e plum e contours , thes e fou r monitorin g well s hav e bee ninclude do nbothth e overburde ncontour s (Figur e 4-1 ) an dth e shallo w bedroc k contour s (Figur e 4-3) , a s wel l a s th e composit e contour s (Figur e 4-4)

. I ngeneral , highes t

TC V concentration s ar e observe di nth e overburde nan dshallo w bedroc k wel l stratu m (Figure s 4- 1 an d4-3) , i nth e northeas t corne r o f th e forme r

Gran t Gea r buildin g slab

. Th e highes t TC V concentration s appear

t o b e localize di nthi s are aan dinclud e extractio nwell s EW- 9 an dEW-11

. Elevate dTC V concentration s ar e als o note da t extractio nwel l EW-8

. Th e note dextractio nwell s wit h hig hTC V concentration s ar e considere dshallo w bedroc k and/o r lowe r overburde nwells , an dappear t o hav e TC V concentration s significantl y greate r tha nnearb y uppe r

overburde nwell s (Figur e 4-2)

. T o th e wes t

o f th e treatmen t

plant , TC V concentration s showe dsom e variation s compare dt o th e 27 thmonitorin g event

. A t uppe r overburde nmonitorin g wel l ME-10 , th e TC V concentratio ndecreased

. Farthe r t o th e west-northwes t

a t monitorin g wel l B-4 , th e TC V concentratio ndecreased

. O nth e west

sout hwes t

sid e o f th e Gran t

Gear buildin g slab , th e TC V concentratio na t monitorin g wel l MW-1B R increase dslightly

. Th e uppe r

overburde ncontour s (Figur e 4-2 ) hav e contracte dan dspli t int o thre e area s whe ncompare dt o th e 27 t hmonitorin g event

. Thi s i s du e t o th e continue ddetection s o f TC V a t monitorin g wel l MW-7A

. Volatile s wer e no t

detecte da t

extractio nwel l EW- 4 whic hi s consisten t wit hth e las t

o f th e monitorin g events

. A t

extractio nwel l EW-5 , TC V level s significantl y decrease dfro mth e 27 t hmonitorin g event

. Th e uppe r

overburde ncontour s continu e t o sugges t avolatil e organi c sourc e ter mi nth e vicinit y o f monitorin g wel l MW-1 A wit hasignifican t increase

. Th e highes t

uppe r overburde nTC V concentration s ar e observe di nthi s area , whic hi s proximat e t o th e forme r Gran t Gea r buildin g loadin g dock

. Finally , th e contour s depic t

TC V concentration s i nth e vicinit y o f Meado w Broo k

du e t o th e detection s o f TCV s i n th e newl y installe dpiezometers

. Th e shallo w bedroc k

contour s illustrate do nFigur e 4- 3 ar e relativel y consisten t i nshap e an dsiz e t o th e contour s depicte di nth e previou s monitorin g report , however , th e exten t o f th e are agreate r

tha n1,00 0 ug/Lha s decrease ddu e t o th e decreas e o f TCV s a t extractio nwel l EW-8

. TC V concentration s i n lowe r overburden/shallo w bedroc k monitorin g wel l ME- 1 I B i nth e northwester nportio no f th e Sit e increase d slightl y fro mth e result s o f th e 27 t hmonitorin g event

. Not e tha t eac ho f th e bedroc k

monitoring/extractio n well s depicte di nFigur e 4- 3 i s considere dashallo w bedroc k monitoring/extractio nwell , wit hth e exceptio no f

th e dee p bedroc k

monitorin g well s ME- 9 an dMW-7C , locate do nth e easternsit e boundary

. Shallo w bedroc k

TC V concentration s wer e observe di nth e norther nportio no f th e Sit e (ME-8)

.

TD03-00 6 4_ g Apri l 200 6Th e shallo w bedroc k TC V contour s continu e t o indicat e arelativel y hig hTC V concentratio nare a (ME- 8 an dEW-9)

. Th e shallo w bedroc k contaminan t

plum e shap e i s somewha t elliptica l wit hth e cente r o f th e plum e oriente di nanort hsout hdirectio nbetwee nextraction/monitorin g well s EW- 9 an dME-8 , i n th e norther nportio no f

th e Site

. Th e mos t

recen t result s continu e t o sugges t th e cente r

o f th e shallo w bedroc k plum e ma y b e elongatin g towar dth e north

. Lo w TC V concentration s boun dalarg e portio no f th e remainin g plum e t o th e northwes t an dhighe r

t o th e east

. I t

shoul db e note dtha t

th e tw o deep bedroc k monitorin g well s (MW-7 C an dME-9 ) wer e no t include di nth e shallo w bedroc k contour

. Thi s i s becaus e results , t o date , sugges t

tha t contaminatio ni nth e shallo w bedroc k aquife r i s significant ^ differen t (greater ) tha ni nth e dee p bedroc k aquifer

. Du e t o th e absenc e o f

monitorin g dat afro mbeneat hth e foundatio nare ao f th e forme r

Gran t Gear building , i t

i s uncertai nwhethe r

acontiguou s TC V plum e extend s fro mwes t o f th e buildin g t o th e northeas t

o f th e building

. However , sinc e TC V contaminatio nwa s detecte di nshallo w bedroc k well s i nthi s area , acontiguou s TC V plum e seem s ver y likel y an dha s bee nportraye da s suc hi n Figure s 4-1 , 4-3 , an d4-4

. Dee p Bedroc k Onl y asmal l numbe r

o f on-sit e monitorin g well s ar e screene di n deeper (lower ) bedrock

. Thes e includ e monitorin g well s MW-7 C an dME- 9 i nth e easternportio no f th e Site

. Monitorin g wel l MW-6B , whic hi s off-sit e (an dgenerall y upgradient ) t o th e south , i s n o longe r include di nth e samplin g program . Lo w TC V level s includin g viny l chlorid e continu e t o b e detecte di n monitorin g wel l ME-9

. Thi s VO C leve l ha s increase dfro m1. 5 t o 4. 6 ug/Lsinc e th e 27 t hmonitorin g event

. Meado w Broo k

Vicinit y Th e TC V concentratio ni nlowe r overburden/shallo w bedroc k monitorin g wel l ME-11 A t o th e northwes t o f th e treatmen t

plan t near Meado w Broo k

(Figur e 4-4 ) i s slightl y decrease dfro mth e 27 thmonitorin g event

. Th e TC V concentratio ni ncompanio nmonitorin g wel l ME- 1 I B locate di nth e northwes t portio n o f th e Sit e increase dfro mth e previou s results

. Chlorinate dvolatile s wer e no t detecte di nwel l ME-12 B locate do nth e nort hsid e o f Meado w Brook

. However , trac e level s o f tetrachloroethen e wer e detecte di n monitorin g wel l ME-12A , an dtrac e level s o f 1,2-dichloroethen e i nmonitorin g wel l MW-9B , als o o nth e nort hsid e o f

Meado w Brook

. Concentration s fo r TC V a t th e piezometer s alon g th e edg e o f Meado w Broo k range dfro m2. 8 |^g/

L(PZ-04 ) t o 92 5 |ag/

L(PZ-02)

. Not e tha t

piezometer s wer e no t

sample d durin g th e 27 t hmonitorin g event

. 4.4.2. 2 Trichloroethylen e TC Econcentration s o f

greate r tha n1,00 0 (.ig/

Lwer e detecte di nmonitorin g well s MW-1A , MW-1B Ri n th e wester nportio no f

th e Site , an dals o extractio nwel l EW-1 1 |.ig/ Lfurthe r t o th e eas t

(rangin g fro m 2,10 0 t o 108,00 0 ug/L)

. Th e overal l contributio no f TC Et o th e TC V plum e a t th e Sit e ha s decrease dsinc e th e baselin e monitorin g program . And , a s noted , th e detectio nfrequenc y o f TC Esignificantl y decrease dcompare dt o th e las t monitorin g event

. 4.4.2. 3 1,2-Dichloroethen e Tota l 1,2-DC Econcentration s acros s th e Sit e sho w somewha t simila r distribution s t o TCE

. However , durin g recen t

monitorin g events , 1,2-DC Econcentration s hav e generall y exceede dTC Econcentration s a t man y wells

. Thi s tren dha s continue di nth e lates t monitorin g event

. Relativel y hig h(77 0 t o 2,30 0 ug/L ) tota l 1,2-DC Econcentration s continu e t o b e observe di nextractio nwell s EW-8 , EW-9 , EW-10 , an da t piezomete r

PZ-02 , whic har e locate dt o th e nort han dnortheas t o f th e forme r

Gran t Gear buildin g

TD03-00 6 4_ 9 Apri l 200 6

### foundation

. A nelevate dleve l (1,90 0 ug/L ) wa s als o observe da t extractio nwel l l:W- l 1

. Distinctl y lowe r level s (7 1 ug/L ) o f

tota l 1,2-DC Ear e locate di nmonitorin g wel l MW-1B Rlocate dimmediatel y wes t o f th e forme r Gran t Gear building

. 4.4.2. 4 Viny l Chlorid e Th e concentratio ndistribution s o f viny l chlorid e acros s th e Sit e ar e generall y lowe r tha nthos e o f

TC E an d1,2-DCE

. T o th e wes t o f th e forme r

Gran t Gear buildin g foundation , viny l chlorid e concentration s ar e generall y non-detec t

o r a t lo w pp b concentrations

. Viny l chlorid e i s als o no t detecte di nshallo w bedroc k monitorin g wel l ME-3 , t o th e northwes t o f th e forme r

Gran t Gear buildin g foundation

. Viny l chlorid e concentration s increas e significantl y i nth e well s t o th e nort han dnortheas t o f th e forme r

Gran t Gea r buildin g foundatio n(u p t o 12 0 ug/L)

. Immediatel y northo f

th e forme r

Gran t Gear buildin g foundation , elevate dviny l chlorid e level s (2 4 t o 7 4 ug/L ) ar e observe di nlowe r overburde nextractio nwel l EW-1 6 an dshallo w bedroc k extractio nwell s EW

8 an dEW-9

. Viny l chlorid e i s als o observe di nmonitorin g well s ME-11 Aan dME- 8 locate dalon g th e norther nen do f

th e Sit e nea r

Meado w Brook

. I t shoul db e note d(Tabl e 4-2 ) tha t th e numbe r

o f sample s (18 ) i nwhic hviny l chlorid e wa s detecte d decrease dslightl y ove r

wha t wa s observe di nth e 27 t h

### monitorin g even t

(20)

. However , th e maximu m concentratio nincrease dslightl y fro m8 8 t o 12 0 ug/L

. 4.4.2. 5 Chlorinate dHydrocarbo nConcentratio nRatio s Th e rati o o f

th e mola r concentratio no f

TC Et o tha t

o f th e su mo f

tw o breakdow nproduct s (1,2-DC Ean d viny l chloride ) i s highes t

t o th e wes t

o f th e Gran t Gea r buildin g foundatio n(Figure 4-5)

. Th e ratio s are calculate db y dividin g th e mola r concentratio no f

TC Eb y th e su mo f

th e mola r

concentration s o f 1,2-DC Ean dviny l chloride

. I f th e concentratio no f

TC Ei s les s tha nth e reportin g limit , the nth e rati o i s 0

. I f eithe r th e concentratio no f

1,2-DC Eo r

viny l chlorid e i s belo w th e reportin g limit , th e compoun d i s assigne daconcentratio no f 0.2 5 |^g/ L(hal f th e reportin g limit)

. Th e highes t

mola r rati o (-10 ) i s agai nfoun da t monitorin g wel l MW-1A

. Ratio s dro p quickl y fro m aroun dth e maximum

. I t shoul db e note dtha t

du e t o th e absenc e o f

TCE , contour s hav e no t bee n develope di ncertai nnorther nportion s o f th e Site , wher e biodegradatio ni s likel y occurring

. Th e majorit y o f th e remainin g well s ha dratio s o f les s tha none . Overal l th e result s continu e t o sugges t som e ongoin g biodegradation , particularl y i narea s t o th e nort han deas t o f th e forme r

Gran t Gear buildin g foundation

. 4. 5 Semivolatil e Organic s Th e result s o f

groundwate r

analyse s fo r

th e fiv e targe t

semivolatil e organic s ar e presente di nAppendi x B an dsummarize di nthi s section

. Th e semivolatile s whic hwer e analyze dinclude :

• 1,2,4-trichlorobenzen e

• 1,2-dichloroben2en e

• 1, 3 -dichlorobenzen e

• 1,4-dichlorobenzen e

• pentachloropheno l

TD03-00 6 4-1 0 Apri l 200 6KEY :

>10. 0 >5. 0 >1. 0 >0. 5

NOTE : BOL D FAC E WEL L LOCATION S WER E INCLUDE D I N CONTOU R INTERPOLATIO N

NOTE : BAS E PLA N WA S PRODUCE D B Y METCAL F 4 EDD YINC

. AN D MODIFIE D BYFOSTE R WHEELE R ENVIRONMENTA L CORP

. O N 6/26/9 6 AN D NOBI S ENGINEERIN G O N 1/3/02

. 12 0 

### Original s i ncolor

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Shee t Referenc e Number : 

### FIGURE 4- 5 ShM l 1 o f 1

### 4.5. 1 Compariso nt o Sit e Cleanu p Standard s

Th e reporte dsemivolatil e concentration s hav e bee ncompare dt o th e RBA Lsit e cleanu p standards

. A s indicate di nTabl e 4-1 , sit e groundwate r cleanu p standard s (RBALs ) hav e onl y bee nestablishe dfo r tw o semivolatil e compound s (1,4-dichlorobenzen e an d1,2,4-trichlorobenzene)

. Th e frequenc y o f detectio no f thes e tw o semivolatile s i s summarize di nTabl e 4-3

. Th e 1,4-dichlorobenzen e RBA Lcleanu p standar di s 4. 6 mg/L

. Th e RBA Lcleanu p standar dfo r 1,2,4-trichlorobenzen e i s 3 4 mg/L

. Pentachloropheno l wa s no t detecte di nan y samples

. N o RBAL s wer e exceeded

. Tabl e 4- 3 Frequenc y o f

Semivolatil e Organi c Detection s

Analyt e
1 ,2-Dichlorobenzen e 1 ,3-Dichlorobenzen e 1 ,4-Dichlorobenzen e 1 ,2,4-Trichlorobenzen e Pentachloropheno l RBAL Cleanu p Leve l (mg/L ) N E N E 4. 6 3 4 N A Numbe r

Sample s Exceedin g Cleanu p Leve l N A N A 0 0 N A Detectio n

Frequenc y 4/4 4 3/4 4 6/4 4 7/4 4 0/4 4 Maximu m

Detecte d Concentratio n (mg/L ) 0.0 3 0.1 7 D 0. 2 1. 5 N D Associate d

Sampl e Locatio n MW-1 A PZ-02 MW-1B R MW-1 A N A Notes : A tota l o f

4 0 well s (extractio nan dmonitoring ) an d4 piezometer s wer e sample ddurin g th e 200 5 groundwate r monitorin g event

. Fiel dduplicates , tri p blanks , an ddilute dsample s were no t include di nth e frequenc y calculations

. N E- No t Establishe d N A- No t Applicabl e N D - No t Detecte d D - Dilute dSampl e Concentratio n 

### 4.5. 2 Semivolatil e Contaminan t Distribution s Overall , semivolatil e result s wer e reporte di nseve nwell s an dtw o piezometers

. N o SVOC s exceede dth e RBALs

. Th e concentratio ni nmonitorin g wel l MW-1 A increase dsignificantl y fro mth e las t monitorin g even t i n2002 , whil e th e concentratio ni nmonitorin g wel l MW-1B Rdecreased

. 1,2,4-Trichlorobenzen e wa s als o detecte di nthre e othe r monitorin g well s a t

lowe r concentrations

. 4. 6 PCB s Groundwate r

sample s wer e collecte dunfiltere dfro mwell s an dpiezometer s an dwer e analyze dfo r th e PC B Aroclor s (total ) include di nth e EP A TC Llist

. I naddition , a t certai nwel l location s an dal l piezomete r

locations , groundwate r

sample s wer e als o filtere dan danalyze dfo r PCB s (dissolved)

. Tw o Aroclor s (124 8 an d1254 ) wer e reporte di nth e unfiltere dgroundwate r sample s analyze d(Tabl e 4-4)

. PCB s wer e detecte di natota l o f 1 6 monitorin g an dextractio nwell s (no t includin g duplicates ) an d 3 piezometers

. Not e tha t i norde r t o achiev e alowe r

reportin g limit , th e PC B laborator y sampl e extractio nmetho dwa s modified

. Th e modificatio ninclude da10-fol dconcentratio nstep , whic hi s reflecte da s afacto r o f te n lowe r reportin g limit , compare dt o th e unmodifie dmetho dreportin g limit

. Thi s i s consisten t wit h previou s PC B analyse s a t

th e Site

. A s mentione dabove , groundwate r sample s collecte ddurin g thi s monitorin g even t wer e als o field-filtere d at fiv e selec t

monitoring/extractio n wel l location s (B-4 , EW-16 , EW-4 , MW-1B- Ran dMW-2A ) an dat th e fou r piezometer s fo r

PC B analyse s (dissolved)

. Th e result s fo r unfiltere dan dfiltere dPCB s ar e summarize di nTabl e 4- 5 fo r monitorin g an dextractio nwell s an di nTabl e 4- 6 fo r th e piezometers

.

TD03-00 6 Apri l 200 6 4-1 2Tabl e 4- 4 Frequenc y o f

PC B Detection s

Analyt e Aroclor-101 6 Aroclor-122 1 Aroclor-124 2 Aroclor-124 8 Aroclor-125 4 Aroclor-126 0 RBA L Cleanu p Leve l (mg/L ) N E N E N E N E N E N E Numbe r

Sample s Exceedin g Cleanu p Leve l N A N A N A N A N A N A Detectio n

Frequenc y 0/4 4 0/4 4 0/4 4 12/4 4 16/4 4 0/4 4 Maximu m

Detecte d Concentratio n (mjs/L ) N A N A N A 0.02 3 0.01 5 N A Associate d

Sampl e Locatio n N A N A N A MW-1 A MW-2 A N A Notes : A tota l o f

4 0 well s (extractio nan dmonitoring ) an d4 piezometer s wer e sample ddurin g th e 200 5 groundwate r monitorin g event

. Fiel dduplicates , tri p blanks , an ddilute dsample s no t include di nth e frequenc y calculations

. Frequenc y o f

PC B detection s an dmaximu mdetecte dconcentration s base do nunfiltere d(total ) PC B data

. N E- No t Establishe d N A- No t Applicabl e Tabl e 4- 5 Monitorin g an dExtractio n Well s Filtere dan dUnfiltere dPC B Result s Analyt e Unfiltere d(total ) Aroclor-124 8 Aroclor-125 4 Filtered(dissolved

) Aroclor-124 8 Aroclor-125 4 B- 4
2 2 8
0.2 9 0.3 6 EW-1 6

0.0 5 U 0.0 5 U
0.0 5 U 0.0 5 U EW- 4

0.2 5 U 2. 7
0.0 5 U 0.0 5 U MW-1B- R

1 2 7. 6 J
0.0 5 U 0.0 5 U MW-2 A

2. 5 U 1 5
0.0 5 U 0.0 5 U Notes : J = Estimate d U = Undetecte da t

reportin g limi t Onl y aroclor s detecte dar e presente di ntable

.

A s i s indicate di n Tabl e 4-5 , mos t o f th e Aroclo r

PCB s detecte di n th e fiv e groundwate r well s tha t

wer e examine dappear

t o b e associate dwit hsuspende dphas e o r particulat e matter

. However , th e result s fo r th e piezometer s (Tabl e 4-6 ) sugges t tha t asignifican t

fractio no f

th e PCB s i n piezomete r PZ-0 2 ma y b e i n adissolve do r

smal l colloida l phase

.
Tabl e 4-6

Piezomete r

Filtere dan dUnfiltere dPC B Result s (Hg/L ) Analyt e PZ-0 1 PZ-0 2 PZ-0 3 PZ-0 4 Unfiltere d(total ) Aroclor-124 8 Aroclor-125 4 0.0 5 U 0.0 5 U 17 J

1 7 3

0.0 5 U 0.2 4 J

0.2 6 Filtere d(dissolved) Aroclor-124 8 Aroclor-125 4 0.0 5 U 0.0 5 U 10 J

1 3 0.0 5 U

0.0 5 U 0.0 5 U

0.0 5 U Notes : J = Estimate d U = Undetecte da t

reportin g limi t Onl y aroclor s detecte dar e presente di ntable

.

TD03-00 6 Apri l 200 6 4-1 34.6. 1 Compariso nt o Standard s

Groundwate r

tota l PC B concentrations , wher e detected , range dfro m0.06 \ig/ L(MW-4B ) t o 3 0 |.ig/ L (B-4)

. N o sit e cleanu p standard s hav e bee nestablishe dfo r PCB s i ngroundwater

. 4.6. 2 Contaminan t

Distributio n Geographi c examinatio no f th e PC B dat a(Figur e 4-6 ) indicate s tha t th e groundwate r

PC B concentration s ar e no t closel y clustered , bu t

rathe r ar e observe di nwell s fro msevera l area s o f th e Site

. However , mos t o f th e well s containin g PCB s ar e locate di nwester nan dnorther nportion s o f th e Site

. Th e highes t

tota l PC B concentratio n(3 0 fig/L ) i s observe da t wel l B-4

. Concentration s o f

PCB s i nmos t

o f th e well s increase dove r

level s measure di nth e 27 t hmonitorin g even t results , whil e i nthre e extraction/monitorin g well s (EW-5 , MW-4 A an dME-10) , concentration s decreased

. Fo r

wel l MW-2A , i n th e easter nportio no f th e Site , th e concentratio nincreased

. 4. 7 Inorganic/Meta l Analyse s I naccordanc e wit hdirectio nreceive dfro mth e USAGE , n o metal s analyse s wer e performe di n conjunctio nwit hthi s monitorin g event

.

TD03-00 6 4-1 4 Apri l 200 6U S Arm yCorp s o f Enginwr s N* wEnglan d Dtstrlc l

KEY :

NOTE : BOU) FAC E WEL L LOCATION S WER E INCLUDE D I N PC8 CONTOU R INTERPOLATIO N

NOTE : BAS E PLA N WAS PRODUCE D B Y METCAL F tcEDD Y INC

. AN D MODIFIE D B

Y FOSTE R WHEELE R ENVIRONMENTA L CORP

. O N 6/26/9 6 AN D NOBI S ENGINEERIN G O N 1/3/02

. 

### Original s i n colo r 

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6 0 o 6 0 12 0

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- hJ SCAL £ I N FEET Shee t Referenc e Number : 

### FIGURE 4- 6 Shu t 1 o f 15. 0 SUMMAR Y DISCUSSIO N

5. 1 Hydrogeologica l Investigatio n Progra m Monitorin g wel l gaugin g wa s performe do nJul y 13 , 2005

. Groundwate r elevation s ar e include do n Figure s 3- 1 an d3-2

. Th e result s o f wate r leve l measurement s acros s th e Sit e indicat e overburde n groundwate r

elevation s betwee n39.5 9 an d48.2 8 feet , an dbedroc k groundwate r

elevation s betwee n 43.7 8 an d50.3 7 feet

. Thes e gaugin g dat aindicat e overburde ngroundwate r flo w predominantl y t o th e eas t wit hanortheas t

componen t

radiatin g towar dMeado w Broo k i nth e norther nportio no f th e Site

. Groundwate r

flo w i nbedroc k

i s generall y t o th e eas t wit hasoutheasterl y componen t o f flow

. Groundwate r

elevatio ndat ao naverag e indicat e agenerall y downwar dgradien t fro moverburde nt o shallo w bedrock

. Som e verticall y upward s gradient s ar e observe di nth e vicinit y o f th e cluste r MW-7B/7 A an dB-19R/ME-18B

. Thi s i s generall y consisten t wit hpas t reports

. 5. 2 Analytica l Result s Th e result s o f

th e groundwate r

laboratory analysi s progra mindicat e th e continue dpresenc e o f targe t chlorinate dvolatil e organic s i ngroundwate r acros s th e Site , wit hsporadi c detectio no f semivolatile s particularl y 1,2,4-trichlorobenzene

. PCB s (primaril y a s Aroclo r 1254 ) wer e detecte di n les s tha nhal f o f th e well s acros s th e Site

. A compariso no f

th e groundwate r

monitorin g result s t o th e REA Lgroundwate r cleanu p standard s fin d tha t n o contaminant s excee dth e standard s a t th e Site

. 5.2. 1 Trend s i nGroundwate r Volatil e Dat a RBALgroundwate r

cleanu p standard s fo r

volatil e organic s wer e no t exceede danywher e on-site

. Th e tota l chlorinate dvolatil e organi c concentration s observe dwer e primaril y du e t o th e presenc e o f a combinatio no f

1,2-DC Ean dTCE

. Tota l DC Econcentration s excee dTC Econcentration s i nmos t wells

. 1,2-DC Econcentration s range dfro mnon-detec t i nsevera l well s u p t o 2,30 0 |ig/ Li nextractio nwel l EW-9

. TC Econcentration s range du p t o 2,60 0 ng/ Li nextractio nwel l EW-11

. Hig h1,2-DC E concentration s (an dTC V concentrations ) wer e observe di nmonitorin g an dextractio nwell s t o th e immediat e northeas t

(downgradient ) o f

th e forme r

Gran t Gea r buildin g foundation

. Th e result s o f

th e 28 t hmonitorin g even t ar e generall y similar

t o th e TC V trend s observe ddurin g th e previou s 27 t hmonitorin g even t (Octobe r 2002)

. Elevate dTC V concentration s ar e primaril y observe di n th e lowe r overburde n(Figur e 4-1 ) an dshallo w bedroc k (Figur e 4-3)

. I ngeneral , th e highes t TC V concentration s ar e observe di nbothlowe r overburde nan dshallo w bedroc k well s locate di nnorther nan d easternportion s o f

th e Site

. I f th e dat aar e considere di nthre e dimensiona l space , th e TC V concentratio ntrend s ar e consisten t wit h groun dwate r

flo w patterns ; e.g. , th e concentratio ntren di s verticall y downwar dan dt o th e east

. 5.2. 2 Trend s i n Groundwate r Semivolatil e Dat a Th e numbe r

o f well s i nwhic h1,4-dichlorobenzen e wa s detecte dincrease db y on e fro mth e 27 t h monitorin g even t

du e t o th e detectio ni n newly-installe dpiezomete r PZ-02

. Th e numbe r

o f well s i n whic h1,2,4-trichlorobenzen e (1,2,4-TCB ) wa s detecte ddecreased

. Th e 1,2,4-TC B concentratio n (l,500(Jg/L ) a t

monitorin g wel l MW-1 A increase dfro mth e previou s monitorin g event , whil e th e concentratio na t

monitorin g wel l MW-1B R(1,10 0 f^g/L ) decreased

. Thes e concentration s ar e howeve r belo w th e RBA Lcleanu p standard

. Recen t 1,2,4-TC B trend s fo r

monitorin g wel l MW-1 A ar e presente d i nFigur e 5-1

. 1,2,4-TC B wa s als o detecte da t lo w concentration s i nthre e othe r wells , includin g extractio nwell s EW-1 1 an dEW-1 6 i nth e easter nportio no f th e Sit e an dmonitorin g wel l B-1 8 i nwest

TD03-00 6 5- 1 Apri l 200 6centra l portio no f th e Site

. I nadditio ntw o piezometers , PZ-0 2 an dPZ-03 , alon g Meado w Broo k als o ha d detection s o f

1,2,4-TCB

.

TD03-00 6 5- 2 Apri l 200 6

### Figur e 5- 1 1,2,4-Trichlorobenzen e Concentration s a t Wel l MW-1 A

MW-1 A(Uppe rOverburden )

O 

### £ o O 

### u 49. 5 4 9 48. 5 4 8 47. 5 § 

# 7 0

) 4 7 8

l

_ 46. 5 - S 5 4 6 45. 5 4 5 44. 5 -1,2,4-Trichlorobenzen e

- Wate rleve l

Monitorin g Even t

Notes : l,2.4-trichlorohenzen e sampl e result s to rmonitorin g even t I D wer e non-detec t (detectio n limi t = 1 0 ug/L)

.

Sample s wer e no t collecte d i n th e 6' h an d 7 1 ' 1 monitorin g events

. Monitorin g event s 1-2 7 occurre d betwee n Apri l 199 6 an d Octobe r2002

. Monitorin g even t 2 8 occurre d i n June/Jul y2005

.


### IOriginal s i ncolo r j

Apri l 200 6 5- 35.2. 3 1,2,4-Trichlorobenzen e Migratio n

Ove r th e las t severa l monitorin g event s u p t o 200 2 an di nthi s event , th e frequenc y o f detectio no f

1,2,4

- TC B acros s th e Sit e ha s bee nsomewha t highe r tha ni npreviou s events

. Th e reaso nfo r thi s i s uncertain

. 1,2,4-TC B i s relativel y insolubl e i nwate r (solubilit y -1 9 mg/La t

22°C ; Verschueren , 1996)

. However , th e currentl y measure dconcentratio na t monitorin g wel l MW-1 A i s approximatel y ~ 1 mg/L

. Thi s concentratio ni s stil l les s tha non e tent ho f th e solubilit y limi t

(a t 22°C)

. Thi s woul dsugges t tha t th e observe dconcentration s shoul db e dissolved , bu t migh t b e o nth e borderlin e betwee nbein g adissolve d phas e an danon-aqueou s phas e liqui d(NAPL ) phase

. Thi s migh t partiall y explai nwh y concentration s hav e no t stabilize da t

monitorin g wel l MW-1A , a s som e additiona l solubilizatio no f unsaturate dzon e 1,2,4-TC B ma y continu e t o occur . Sinc e 1,2,4-TC B i s relativel y dens e (densit y = 1.5 7 a t 10°C) , an y NAP Lphas e woul db e expecte dt o wor k downwar dthroug hth e shallo w aquifer

. Th e continue ddetectio n o f elevate d1,2,4-TC B a t

nearb y lowe r

overburde nmonitorin g wel l MW-1B Rma y indicat e tha t som e downwar dmigratio nis , i n fact , occurring

. A s note dabove , ther e ha s bee nagradua l increas e i nth e frequenc y o f detectio no f

1,2,4-TC B acros s th e Site

. A nevaluatio no f

th e curren t

dat acontinue s t o revea l tha t several o f

th e well s i nwhic h1,2,4-TC B wa s detecte dar e relativel y near th e downgradien t

edg e o f th e concret e foundatio no f th e forme r

Gran t Gea r building

. Thi s include s extractio nwell s EW-1 1 (5 4 ug/L ) an dEW-1 6 ( 5 Mg/L)

. Overall , th e 1,2,4

- TC B plum e remain s relativel y limite di n extent , howeve r th e detectiono f

1,2,4-TC B i n tw o o f

th e piezometer s (PZ-0 2 an dPZ-03 ) woul dindicat e tha t migratio ni s occurrin g int o Meado w Brook

. 5.2. 4 Trend s i nPC B Dat a Sampl e result s fro msixtee nwell s an dthre e piezometer s detecte dPCBs

. Overall , th e majorit y o f elevate d PC B concentration s ar e observe di n monitorin g wells , extractio nwells , an dpiezometer s screene di n th e uppe r overburden

. Figur e 5- 2 include s arevie w o f PC B concentration s fro mcertai nwell s screene di n uppe r overburden

. Th e firs t

grap hinclude s well s fro mth e eastern(MW-2A ) an dwester n(B-4 ) portion s o f th e Site , an dth e secon dgrap hinclude s well s entirel y fro mth e wester nportio no f th e Sit e (B-18 , MW-1A , B-10 , an dB-9)

. Th e plot s i nFigur e 5- 2 sho w asmal l increas e i nPC B concentration s a t thre e locations , B-4 , MW-2 A an dMW-1 A i nth e mos t recen t monitorin g even t

compare dt o th e las t

severa l monitorin g events

. I t

shoul dals o b e note dtha t EP A lo w flo w procedure s wer e use dt o collec t th e groundwate r

samples , beginnin g wit hth e eight hmonitorin g event

. PC B result s fo r

th e curren t

monitorin g sho w som e change s fro mthos e o f th e las t severa l monitorin g events

. I nth e curren t

event , thre e well s ha daPC B concentratio ni nexces s o f 1 0 ug/Lcompare dt o jus t on e i n th e 27 thmonitorin g event

. Als o on e o f th e piezometer s ha dPC B concentration s a t greate r tha n 1 0 ug/L

. Th e overal l shap e o f th e plum e i s simila r

t o tha t i nth e 27 t hmonitorin g even t fro mOctobe r

200 2 (se e Figur e 4-6)

. Th e concentratio no f PCB s observe di n monitorin g wel l MW-4 A (1. 1 ng/L ) decrease d fro mth e 27 t hmonitorin g even t (2. 8 ng/L) , resultin g i nacontractio no f th e contour s i nthi s area . Monitorin g wel l B- 9 ha dapositiv e result , compare dt o th e previou s samplin g no ndetect , whic hcause s th e plum e t o expan dt o th e west

. PCB s continu e t o b e detecte da t monitorin g wel l B-19 Ri nth e northwes t corne r o f th e Sit e an dha da nincreas e i nconcentratio nfro m0.6 6 ug/Lt o 4. 2 ug/ LPCB s als o continu e t o b e observe da t

monitorin g wel l ME- 1 I B adjacen t t o Meado w Broo k

an dwer e detecte di n thre e o f th e fou r piezometer s alon g th e brook

. Th e highes t tota l PC B concentratio nwa s detecte da t monitorin g wel l B- 4 (3 0 ng/L ) a nincreas e fro m1 2 ug/ Li nth e 27 t hmonitorin g event

. Th e result s o f th e groundwate r monitorin g reporte di nSectio n4. 6 woul dindicat e tha t PCB s ar e migratin g fro mth e groundwate r int o Meado w Brook

.

TD03-00 6 5- 4 Apri l 200 6Figur e 5- 2 PC B Trend s i n Uppe r Overburde n Well s
PC B Trend s i n Easter n an d Wester n Sit e Area s

Monitorin g Even t

PC B Trend s i n Easter n an d Wester n Sit e Area s (Detail )

-B- 4 •MW-2 A

Monitorin g Even t

Notes : Sample s wer e no t collecte ddurin g th e 6' 1 ' an d7 l hmonitorin g events

. Monitorin g event s 1-2 7 occurre dbetwee nApri l 199 6 an dOctobe r 2002

. Monitorin g even t 2 8 < u curre di n June/Jul y 2005

.

TDOMXK

. 5- 5 Apri l 200 6 

### Origin ; i s i ncolo r

### Figur e 5- 2 (cont'd ) PC B Trend s i n Uppe r

Overburde nWell s
PC S Trend s i n Wester n Are a

Monitorin g Even t

PC B Trend s i n Wester n Are a (Detail )

Monitorin g Even t * B-1 8 -•—MW-1 A -A—B-1 0 -*—B- 9

« B-1 8 -•—MW-1 A -A

—B-1 0 -x—B- 9

Notes : Sample s wer e no t collecte d durin g th e 6 l h an d 7' h monitorin g events

. Monit < -rin g event s

1-2 7 occurre d betwee n Apri l 199 6 an d Octobe r2002

. Monitorin g even t 2 8 occurre d i n June/Jul y2005

.

TDOMXJ 6 Apri l 200 6 5- 6 

### Original s i ncolo r—I t

shoul db e note dtha t

th e detectio no f

PC B concentration s a t

monitorin g wel l MW-4 A tend s t o expan d th e PC B contour s (Figur e 4-6 ) towar dth e sout han dwest

. Du e t o th e overal l lac k o f monitorin g well s i n thi s area , th e shap e o f

th e contour s an dth e exten t o f PCB-contaminate dgroundwate r shoul db e considere duncertain

. Th e dilut e (blu e shaded ) contour s show ni n Figur e 4- 6 indicat e tha t th e PC B plum e ma y exten dfurthe r

south

. 5. 3 Compariso n wit hPreviou s TC V Extractio nWel l Dat a « Curren t

monitorin g result s hav e bee nevaluate di ncompariso nt o Baselin e an dpreviou s extractio nwel l result s t o determin e th e exten t o f change s i ngroundwate r

volatil e organi c contaminan t level s whic hhav e

moccurre dfollowin g th e initiatio no f GWT Poperatio nan dth e cessatio no f operation

. Again , i t

shoul db e note dtha t th e extractio nwell s hav e no t bee noperationa l sinc e th e 18 t hmonitorin g event

. Tabl e 5- 1 present s acompariso no f extractio nwel l tota l chlorinate dvolatil e level s wit hthos e o f th e * previou s monitorin g event

. Thes e dat aar e depicte di n Figur e 5-3

. A s i s indicated , overal l TC V result s i n

som e extractio nwell s var y significantl y betwee nth e Baselin e an dcurren t result s dependin g upo nth e wel l i nquestion

. Overall , th e 200 5 monitorin g result s ar e generall y simila r t o th e result s o f

th e las t monitorin g * even t

i n Octobe r

200 2 wit hth e exceptio no f extractio nwel l EW- 8 wher e th e concentratio ndecrease dt o level s belo w previou s event s an dextractio nwel l EW-1 8 wher e th e concentratio nincrease dt o level s highe r the ndetecte di nth e las t

severa l monitorin g events

. < • Examinatio no f th e chlorinate dvolatile s dat afo r certai nextractio nwell s indicate s some change s i n chlorinate dvolatile s concentrations

. A t extractio nwel l EW-11 , adjacen t t o th e northeas t

corne r o f th e forme r Gran t Gea r buildin g foundation , th e TC V concentratio n(4,39 6 ng/L ) increase dfro mth e leve l (2,09 1 (ig/L ) o f

th e previou s monitorin g event

. Th e trend s fo r individua l chlorinate dvolatile s fo r extractio nwel l EW-1 1 ar e als o presente di nFigur e 5-4

. A s previousl y noted , th e monitorin g result s fo r extractio nwel l EW-1 1 hav e bee nhighl y erratic

. A revie w o f th e patter nsinc e th e shutdow no f th e GWT Pfind s tha t

th e highes t

concentration s fo r

TC V a t extractio nwel l EW-1 1 ten dt o b e i nth e Apri l t o Jun e monitorin g events

. A s indicate db y Figur e 5-4 , thes e April/Jun e result s sugges t agradua l overal l downwar dTC V trend

. < H Th e result s fo r som e o f th e mor e norther nextractio nwell s (t o th e nort ho f th e forme r

Gran t Gear buildin g foundation ) shoul dals o b e noted

. Result s fo r lowe r overburde nextractio nwel l EW-1 0 increase dfro m

mth e leve l o f th e 27 t hmonitorin g event

. Thi s wel l i s locate dt o th e eas t o f th e GWT Pan ddowngradien t o f th e primar y extractio nwel l line

. Furthe r t o th e west , TC V result s fo r extractio nwel l EW- 8 decrease d significantl y belo w result s fo r th e 27 t hmonitorin g even t (Figur e 5-5)

. Result s to r extractio nwel l EW- 9

—als o decrease dfro mth e las t monitorin g even t

i nOctobe r

2002

. 5. 4 Compariso n wit hPreviou s Monitorin g Wel l Dat a- Plum e Migratio n
mA close r

examinatio no f

th e overal l TC V dat afo r th e 200 5 monitorin g even t (Figure s 4-1 , 4-2, 4-3 , 4-4 , an dTabl e 5-2 ) fro mdifferen t area s o f th e Site , show s certai nvariation s a s compare dt o recen t trend s observe ddurin g th e previou s monitorin g events

.

* 5.4. 1 Upgradien t Wester nSit e Area s Th e monitorin g dat acontinu e t o indicat e tha t shuttin g of

f th e GWT Pma y hav e somewha t altere dth e

—overburde nplum e i nth e wester nportion s o f th e Site

. Specifically , th e dat asuggest s tha t TC V contaminatio ncontour s i nth e overburde nan dshallo w bedroc k (Figure s 4-1 , 4-2 , an d4-3 ) ma y hav e shifte dsomewha t

t o th e nort hwhe ncompare dt o th e result s prio r t o th e GWT Pshutdown

.

TD03-00 6 5- 7 Apri l 200 6Tabl e 5- 1 Compariso n o f

TC V Extractio n Wel l Result s (|ig/L)

Extractio n Wel l I D
EW- 4 EW- 5 EW- 8 EW- 9 EW-1 0 EW-1 1 EW-1 6 EW-1 7 EW-1 8 Baselin e

3 4 7 2 3,54 1 1,12 2 89 9 7,61 8 4,07 0 2,40 0 19 9 1s

t Monitorin g Even t Ap r 199 6 11 1 1 2 1,37 0 1,14 3 78 8 3,56 0 3,70 0 2,36 0 15 1 18 th *

Monitorin g Even t Ju l 200 0 0 0 2,83 1 3,84 8 1,02 8 7,60 0 80 0 918. 1 52. 2 19 1 " *

Monitorin g Even t Oc t 200 0 0 2. 1 1,96 6 3,98 5 1,33 0 1,32 0 61 0 37 9 48. 1 20 th *

Monitorin g Even t Ja n 200 1 0 4. 4 3,07 8 3,35 8 1,24 0 4,24 2 7 1 2 49 3 5 5 21" *

Monitorin g Even t Ap r 200 1 0 5. 1 1,51 0 3,77 8 2,18 8 6,20 0 66 4 46 0 5 6 22 nd * Monitorin g Even t Aug200 1 0 0 2,39 0 3,73 0 2,34 2 9 L O 73 3 88 0 5 3 23 rd *

Monitorin g Even t Oc t 200 1 0 1. 5 1,90 7 1,98 9 1,24 8 6 5 80 5 48. 8 3 5 24'" *

Monitorin g Even t Ja n 200 2 0 6. 9 1,97 3 2,98 4 70 0 1,60 7 39 4 2 6 1 9 25 lh *

Monitorin g Even t Ap r 200 2 0 10 3 1,47 2 3,54 4 1,54 5 5,20 0 52 8 33 0 57. 6 26 lh *

Monitorin g Even t Au g 200 2 0 2 1,85 0 3,57 0 1,59 8 22 0 75 1 7 6 7 3 27 lh *

Monitorin g Even t Oc t 200 2 0 54. 7 1,48 5 3,52 3 1,19 3 2,09 1 40 6 67.4 6 67. 1 28' "

Monitorin g Even t Jun/Ju l 200 5 0 1.6 9 74 3 2,64 4 1,62 9 4,39 6 59 9 267. 1 211. 2 N S - No t

Sample d * Not e tha t

th e GWT Pwa s shu t

down

. Th e result s fo r

th e 2'" 1 throug hth e I7 1 " 1 monitorin g event s ar e no t show nfo r

convenienc e t o simplif y dat apresentation

. Zer o (0 ) = non-detecl

. Th e samplin g fo r

th e 27" ' monitorin g even t wa s complete di nOctobe r 2002

. Th e samplin g fo r th e 28 " monitorin g even t wa s complete di nJune/Jul y 2005

.

TD03-00 6 Apri l 200 6 5- 8Figur e 5- 3 Extractio n Wel l TC V Concentration s

10,00 0

Monitorin g Even t

Notes : Monitorin g event s I-2 7 occurre dbetwee nApri l 199 6 an dOctobe r 2002

. Monitorin g even t

2 8 occurre di nJune/Jul y 2005

. —• —EW- 4 -m—BN- 5 -A

—EW- 8

- —EW- 9 -*—EW-1 0 —•—EW-1 1 EW-1 6 —•—EW-1 7

-— - EW-1 8

Uriginal s i n color , '

TDO.'-OO d Apri l 200 6 5- 9Figur e 5- 4 Extractio n Wel l Chlorinate dVolatil e Distributio n

EW-1 0 (Lowe rOverburden )
250 0 |

200 0

o £

o O 150 0

100 0

50 0

Monitorin g Even t —TC V

* Viny l Chlorid e —A

—1,2-Dichloroethen e (total )

—•— • Trichloroethen e

EW-1 1 (Lowe rOverburden )

c o 1000 0 900 0 800 0 700 0 600 0 500 0

« 400 0
J 300 0 200 0 100 0 0 •* rC D i n C M < M o

o Monitorin g Even t TC V Viny l Chlorid e

- 1.2-Dichloroethen e (total ) -Trichloroethen e
Notes : Monitorin g event s I-2 7 occurre d betwee n Apri l 199 6 an d Octobe r2002

. Monitorin g even t 2 8 occurre d i n June/Jul y2005

.

TOO.'-00 6 Apri l 200 6 5-1 0 

### On^mal s i ncolor

. 

### lor , ]400 0

350 0

300 0

250 0

' • 200 0
§ 150 0 c o 0 100 0
50 0
0 Figur e 5- 5 Extractio n Wel l TC V Trend s

EW- 8 (Shallo w Bedrock )

TC V Viny l Chlorid e -1,2-Dichloroethen e (total ) -Trichloroethen e

o o C M Monitorin g Even t

EW-1 6 (Lowe rOverburden )

-TC V Viny l Chlorid e

- 1,2-Dichloroethen e (total ) -Trichloroethen e

Monitorin g Even t

Notes : Monitorin g event s I-2 7 occurre d betwee n Apri l 199 6 an d Octobe r2002

. Monitorin g evni l 2 8 occurre d i n June/Jul y200?

.

T DO?-00 6 Apri l 2(X)< S 5- 1 I Original s in color

### Tabl e 5- 2 Compariso no f

TC V Monitorin g Wel l Result s (jig/L )

Sampl e Locatio n B- 4 B- 9 B-1 0 B-1 8 B-19 R B-22 1 B-2 8 ME- 2 ME- 3 ME- 4 ME- 5 ME- 6 ME- 8 ME- 9 ME

- 1 0 ME-11 A ME-1I B ME-12 A ME-12 B ME-18 B MW-1 A MW-IB/-IBR 1 MW-1C 1 MW-2 A MW-2 B MW-3A/-3AR 1 MW-3 B MW-31/-3IR 1 MW-4 A MW-4 B MW-5A 2 M W<B ? MW-6A 2 MW-6B 2 MW-7 A MW-7 B MW-7 C MW-8 I MW-9 B Baselin e

12 5 2 5 4,24 0 4 N A 16 4 0 1,08 0 N S 0 0 0 81 1 0 N A N A N A N A N A N A 46 9 95 5 1 1 28 0 0 0 1 0 0 0 0 0 0 2 2 0 3 0 1 " Monitorin g Even t Ap r 199 6 12 4 0 61 5 3 6 N A N S 1 9 1,42 0 6 4 0 0 2 66 2 0 N A N A N A N A N A N A 73 0 40 7 0 3 18 9 N S 0 0 0 0 0 0 0 0 2 7 0 0 7 3 18' " V Monitorin g Even t Ju l 200 0 90. 8 4. 4 37. 8 0 0 N S N S 2. 4 9 7 0 0 N S 59 7 9. 5 117. 4 71 3 113. 4 4. 6 0 0 3.50 0 1,93 0 N S 0 62. 4 0 0 0 N S 0 N S N S N S N S 98. 4 0 0 4. 6 0 19" 1 V Monitorin g Even t Oc t 200 0 219. 3 7. 0 77. 6 0 0 N S N S 1. 1 4 7 0 0 N S 65 0 7. 8 31 4 54 6 9 7 0 0 0 95 0 174 0 N S 0 62. 7 0 0 0 2. 0 0 N S N S N S N S 5 5 0 0 2. 0 0 20' " V Monitorin g Even t Ja n 200 1 184. 9 5. 4 29. 1 0 0.2 8 N S N S 0 5 9 0 0 N S 71 4 5. 0 45. 9 49 1 102. 5 0 0 0 114 1 108 4 N S 1.1 2 77. 5 0 0 1.2 4 0 0 N S N S N S N S 5 7 0 0 2. 1 0 21" V Monitorin g Even t Ap r 200 1 156. 2 0 37. 5 0 0 N S N S 0 11 5 0 0 N S 565 5. 2 0 60 0 43. 1 0 0 0 63 8 108 0 N S 0 64. 3 0 0 0 0 0 N S N S N S N S 6 7 0 0 1. 9 0 22 n dV Monitorin g Even t Aug200 1 13 3 9. 4 27. 7 0 0 N S N S 1. 2 6 4 0 0 N S 68 6 9 3 1 69 0 59. 2 0 0 0 1,70 0 1,23 0 N S 0 104. 7 0 0 0 0 0 N S N S N S N S 90. 5 0 0 3. 7 0 23 r dV Monitorin g Even t Oc t 200 1 216. 6 4. 3 45. 9 0 0 N S N S 1. 9 3 5 0 0 N S 61 4 1 8 58 3 75 0 79. 4 0 0 0 98 2 1,71 0 N S 0 127. 5 0 0 0 0 0 N S N S N S N S 115. 2 0 0 8. 6 0 24" 1 V Monitorin g Even t Ja n 200 2 124. 5 4. 2 6. 6 0.8 2 0.4 5 N S N S 0.3 8 36. 6 0 0 N S 42 8 6. 6 57. 4 64. 1 35. 8 0.3 9 0 0 1,42 3 1,19 2 N S 3. 6 143. 7 0 0 1 0 0 N S N S N S N S 64. 7 0 0.2 5 6. 7 0 25' " V Monitorin g Even t Ap r 200 2 10 5 0 55. 9 0 0 N S N S 7. 4 23. 6 0 0 N S 54 7 16. 3 0 62 1 49. 6 0 0 0 1,10 0 1,84 0 N S 12. 4 128. 8 0 0 0 0 0 N S N S N S N S 51. 3 0 0 3. 1 0 26' " V Monitorin g Even t Au g 200 2 189. 2 1. 4 75. 2 0 0 N S N S 6. 8 45. 2 0 0 N S 59 6 10. 2 144. 4 64 0 90. 4 0 0 0 99 2 1,91 0 N S 0 248. 8 0 0 0 2. 2 0 N S N S N S N S 0 7 1 0 11. 2 0 27 t hV Monitorin g Even t Oc t 200 2 207. 7 7.4 6 70.2 4 1.5 8 0.4 3 N S N S 2.5 2 35.5 2 0 0 N S 65 0 4.9 3 10.8 4 67 4 65. 2 0. 3 0 0 97 6 1,543. 9 N S 6.3 7 238. 8 0 0 0.5 6 0 0 N S N S N S N S 32.6 9 0 0.8 8 10.2 6 0.2 8 28 l b V

Monitorin g Even t Jun/Ju l 200 5 103. 7 4. 3 20. 4 0 0 N S N S 10. 4 5 7 0 0 N S 56 2 10. 6 0 54 7 89. 4 0.4 3 0 0 2,10 0 1,96 7 N S 0 537. 6 0 0 0 0 0 N S N S N S N S 48.7 7 0 0 5. 4 0.3 5 Notes : Concentration s o f zer o indicat e tha t

n o volatil e compound s wer e detecte da t thei r respectiv e detectio nlimits

. N S - No t Sampled

. N A - Indicate s n o dat aavailable

. Ne w wel l installed

. 1 Well s wer e destroye do r abandoned

. Not e tha t

monitorin g well s B-22 , MW-1B , MW-3 A an dMW-3 1 wer e replace dwit hmonitorin g well s ME-10 , MW-1BR , MW-3AR , an dMW-3IR , respectively

. Monitorin g well s MW-1 C wa s buried

. 2 Monitorin g well s MW-5A , MW-5B , MW-6A , MW-6 B no t sample dafte r

th e 4' hmonitorin g even t

pe r USAG Einstructions

. V GWT Pwa s shu t

down

. Th e 27" 1 monitorin g even t wa s complete di nOct

. 2002

. Th e 200 5 monitorin g even t wa s complete di nJune/Jul y 2005

. TD03-00 6 Apri l 200 6 5-1 25.4. 2 Downgradien t Site Area s Thi s sectio nexamine s TC V migratio ntrend s i nth e norther nan deaster narea s o f th e Site

. Th e mos t recen t dat acontinue s t o sugges t tha t overal l plum e migratio npattern s i nth e norther nan deaster nportion s o f th e Sit e hav e change dsomewha t a s aresul t

o f shutdow no f

th e GWTP

. Th e availabl e dat aals o sugges t tha t plum e migratio npattern s continu e t o diffe r somewha t

betwee nth e uppe r

overburde nan dlowe r overburde nan dshallo w bedrock

. Norther nSit e Area s an dMeado w Broo k TC V concentration s a t

monitorin g wel l ME- 8 (56 2 |.ig/L ) screene di nshallo w bedroc k i nth e norther n portio no f th e Sit e agai ndecrease dslightl y ove r level s reporte di nth e 27 t hmonitorin g even t (Figur e 5-6)

. Result s fro mmonitorin g well s ME-11 A an dME-11 B continu e t o indicat e evidenc e o f elevate dlevel s o f TC V contaminatio napproachin g Meado w Brook

. A t monitorin g wel l ME-11 A adjacen t t o Meado w Brook , aTC V concentratio no f 54 7 |dg/ Lwa s detected

. Thi s concentratio nals o decrease dslightl y compare dt o th e 27 t hmonitorin g even t resul t (67 4 |Jg/L)

. A t

monitorin g wel l ME-11 B th e TC V concentratio n (89. 4 ng/L ) i s slightl y highe r tha nth e las t

o f th e monitorin g event s (65. 2 |ig/L)

. (A s previousl y noted , monitorin g well s wer e no t sample ddurin g th e 6 t han d7 t hmonitorin g events , henc e th e omissio ni n Figur e 5-6. ) Th e curren t

samplin g result s fro mmonitorin g wel l ME-12 B indicate s th e absenc e o f chlorinate dvolatile s o nth e nort hsid e o f

Meado w Brook

. However , trac e level s o f tetrachloroethen e (0.4 3 ^ig/L ) wer e detecte di nmonitorin g wel l MW-12A , t o th e nort ho f th e Brook

. Chlorinate dvolatile s wer e no t detecte di nuppe r

overburde nmonitorin g wel l ME-1 0 ( < 1. 0 fig/L ) indicatin g adecreas e i n concentratio nsinc e th e las t o f th e monitorin g event s (10. 8 ng/L)

. However , uppe r overburde ndat aha s tende dt o b e somewha t errati c i nsevera l wells

. Result s fo r uppe r overburde n extractio n wel l EW- 4 (non-detect ) adjacen t t o th e Brook , wer e consistent wit hth e previou s event

resul t (non-detect)

. Conversely , i nextractio nwel l EW-5 , th e concentratio n(1.6 9 Hg/L ) increase dove r th e 27 t h monitorin g even t

(54. 7 Overall , th e result s o f

thi s monitorin g even t

continu e t o sugges t

tha t som e element s o f

th e VO C plum e hav e shifte dsomewha t

towar dth e nort han dar e dischargin g t o Meado w Brook

. Th e stronges t evidenc e fo r migratio ntowar dMeado w Broo k continue s t o b e th e elevate dTC V concentration s a t monitorin g wel l ME-11 A an dextractio nwel l EW-10 , an dt o alesse r extent , monitorin g wel l ME-11 B an dpiezometer s 

### PZ- 2 an d

### PZ-3

. Easter nSit e Area s Th e curren t

monitorin g even t

result s indicat e onl y limite devidenc e o f low-leve l migratio no f

chlorinate d volatile s directl y t o th e eas t o f th e extractio nwel l arra y an dpossibl y off-site

. A t th e easternen do f

th e Site (Figur e 5-7) , trac e 1,2-DC Econtaminatio n(0.3 5 fig/L ) wa s detecte di n shallo w bedroc k monitorin g wel l MW-9B

. Furthe r

t o th e south , onl y lo w level s o f 1,2-DC E(2. 1 |ig/L ) an dTCE(3. 5 fig/L ) wer e detecte di n lowe r

overburde nmonitorin g wel l MW-8I

. VO C contaminatio nwa s detecte di n uppe r overburde nmonitorin g wel l MW-7A

. However , n o TC V contaminatio nwa s detecte di nshallo w bedroc k monitorin g wel l MW-7B

. Overall , th e lates t contou r dat acontinue s t o indicat e tha t relativel y smal l amount s o f

th e contaminan t

plum e ma y b e migratin g directl y eas t beyon dth e extractio nwel l array .

TD03-00 6 5-1 3 Apri l 200 6Figur e 5- 6 Trend s i n Norther n Sit e Area s

ME- 8 (Shallo wBedrock )

120 0

100 0

TCV Viny l Chlorid e

- 1,2-Dichloroethen e

- Trichloroethen e

Monitorin g Even t

EW-1 0 (Lowe rOverburden )

250 0

TCV Viny l Chlorid e

- 1,2-Dichloroethen e -Trichloroethen e

Monitorin g Even t

Notes : Monitorin g event s I-2 7 occurre dbetwee n Apri l 199 6 an dOctobe r 2002

. Monitorin g ew m2 8 occurre di n June/Jul y 2005

.

TDO.M106 Apri l 200 6 5-1 4 Original s i n colo rFigur e 5- 7 Downgradien t

Plum e Trend s

12 0

10 0

8 0

6 0

4 0

2 0

0 MW-7 A(Uppe rOverburden )

Viny l Chlorid e

- 1,2-Dichloroethen e

- Trichloroethen e

Monitorin g Even t

5 1 MW-8 1 (Lowe rOverburden )

Viny l Chlorid e -1,2-Dichloroethen e -Trichloroethen e

Monitorin g Even t

MW-9 B (Shallo w Bedrock )

2. 5

2. 0

0. 5

0. 0 Viny l Chlorid e -1,2-Dichloroethen e

- Trichloroethen e

Monitorin g Even t

Notes : Sample s wer e no t collecte ddurin g th e 6 l han d7' hmonitorin g events

. Monitorin g event s I -2 1 occurre dbetwee n Apri l 199 6 an dOctobe r 2002

. Monitorin g even t 2 8 occurre di nJune/Jul y 2005

. TD03-00 6 Apri l 200 6 Original s i n colo r

### 5. 5 Compariso n o f Chlorinate dHydrocarbo n Product-Daughte r Mol e Rati o Dat a tm 

### Th e result s fo r th e chlorinate dhydrocarbo nmola r concentratio nrati o dat afo r produc t (TCE ) an d daughte r (1,2-DC E+ viny l chloride ) compound s (Sectio n4.2.2. 5 an dFigur e 4-5 ) ar e generall y consisten t

—

### wit hth e trend s observe dove r recen t monitorin g events

. Th e result s o f th e curren t

monitorin g even t depic t aprofil e o f

decreasin g product-daughte r ratios , movin g eastwar dfro mmonitorin g well s MW-1 A an dMW-1B Rpas t

extractio nwel l EW-11

. I t appear s tha t

th e principa l degradatio nproduc t t o dat e i s dichloroethene

. Th e frequenc y o f viny l chlorid e detection s decrease di nth e curren t monitorin g event

. Th e maximu mreporte dviny l chlorid e concentratio n(12 0 (.ig/L ) a t monitorin g wel l ME-11 A increase d slightl y ove r

th e las t monitorin g event

. I t

shoul db e note dtha t

examinatio no f

th e volatil e dat aindicate s tha t alarg e majorit y o f

th e tota l dichloroethen e concentratio ni s presen t a s cis-dichloroethen e rathe r tha n trans-dichloroethene

. Thi s ca nals o b e apotentia l indicatio no f biodegradation

. I t shoul dals o b e note dtha t a t monitorin g wel l MW-1A , nea r th e forme r

Gran t Gear loadin g dock , * product-daughte r ratio s remai nhigh

. Th e rati o i n thi s are afo r th e curren t

monitorin g even t

i s quit e high

. Thi s i s du e t o ahig hTC Econcentratio n(2,100 fig/L ) an dth e reporte dno ndetec t fo r 1,2-DC Ean dviny l chlorid e a t

elevate dsampl e reportin g limits

. Also , ahig hTC Econcentratio n(1,90 0 (.ig/L ) wa s observe d

• i n nearb y lowe r overburde nmonitorin g wel l MW-1BR

. Thi s resul t support s th e hypothesi s o f aresidua l TC Esourc e ter mi nthi s are ao f th e Site

.

^ 5. 6 Chlorinate dVolatil e Trend s at Wel l MW-1 A Recen t dat ahav e indicate dsomewha t errati c TC V trend s a t

monitorin g wel l MW- 1 A

. Thi s wel l i s locate do nth e wes t

sid e o f th e forme r

Gran t Gear buildin g foundation , i nwha t i s believe dt o hav e bee na

- • possibl e spil l area , nea r th e forme r

loadin g docks

. A s apossibl e sourc e ter marea , volatil e organi c concentration s woul db e anticipate dt o slowl y diminis hove r tim e a s groundwate r

flushe s TC V contaminatio nfro mth e area . However , a s indicate di nFigur e 5-8 , TC V concentratio ntrend s ha dbee n

m

### errati c ove r th e las t several event s i n200 1 an d200 2 an dth e result s fro mthi s mos t recen t monitorin g even t ar e th e highest

sinc e th e 18 th

### even t

complete di nJul y 2000

. Th e dat ao f th e curren t

monitorin g even t indicat e asignifican t

increas e ove r

th e previou s even t

complete di nOctobe r

2002

. A s previousl y | f 

### noted , monitorin g wel l MW- 1 A wa s no t sample dbetwee nth e 6 th

### an d9 th

### monitorin g events

. 5. 7 Implication s o f

Cessatio n o f

GWT P Operation s i i Ther e wer e te nconsecutiv e groundwate r monitorin g event s complete dfollowin g cessatio no f GWT P operation s an dextractio no f groundwate r

betwee nJun e 200 0 an dOctobe r 2002

. Th e result s tende dt o support potentia l change s note di nth e monitorin g trends

. Overall , TC V concentratio ntrend s durin g th e curren t monitorin g even t

presen t continue devidenc e tha t

a portio no f th e VO C plum e i s migratin g alon g amor e nort han dnortheasterl y orientatio ntowar dMeado w Brook

. Th e principa l evidenc e fo r thi s hypothesi s i s depicte di nFigur e 4-4

. Prio r t o th e shutdow no f

th e
" " GWTP , th e highes t TC V concentration s an dassociate dcontour s tende dt o focu s towar dextractio nwel l EW-1 1 t o th e eas t

o f th e forme r

Gran t Gea r buildin g foundation

. I naddition , th e contour s (concentrations ) tende dt o decreas e sharpl y beyon dth e firs t lin e o f extractio nwell s (EW-11 , EW-17 , " ' EW-9 , etc.)

. Th e mos t recen t contou r dat afo r th e shallo w bedroc k

an dlowe r

overburde n(Figur e 4-4 ) continue s t o sugges t

elevate dcontaminatio naroun dextractio nwell s EW- 8 an dEW-9 , implyin g that th e portion s o f

th e plum e ma y b e migratin g mor e t o th e northeas t towar dMeado w Brook

. However , i t shoul d m ib e note dtha t concentration s a t

monitorin g wel l EW-1 1 an dmonitorin g wel l MW-1B Rals o remai n elevate dindicatin g possibl e source(s ) stil l presen t aroun dan dunde r

th e forme r

Gran t Gear Foundatio n building

.

TD03-00 6 5-1 6 Apri l 200 6Figur e 5- 8 Chlorinate dVolatile s Trend s a t Monitorin g Wel l MVV-1 A

350 0

250 0

100 0 • Tota l Chlorinate d VOC s cis-1.2-Dichloroethen e Trichloroethylen e Chlorobenzen e

* * • 1,2,4-Trichlorobenzen e

Monitorin g Even t

Noles : Sample s wer e no t collecte dbetwee nth e 6 l han d9' hmonitorin g events

. Monitorin g event s I-2 7 occurre dbetwee nApri l 199 6 an dOctobe r 2002

. Monitorin g even t

2 8 occurre di nJune/Jul y 2005

.



### Originai s in

TDfM-00 6 Apri l 200 6 5-1 7TC V concentration s at extractio n wel l EW-1 0 hav e bee n relativel y elevate ddurin g th e las t several monitorin g events

. I t

shoul db e note dtha t

extractio nwel l EW-1 0 i s locate dapproximatel y halfwa y betwee nth e primar y extractio nwel l arra y an dMeado w Brook

. Couple dwit hth e continuin g evidenc e o f TC V concentration s a t

monitorin g wel l ME-11 A an dextractio nwell s EW- 8 an dEW-9 , th e overal l result s continu e t o sugges t

apronounce dnort han dnortheasterl y componen t t o th e shallo w bedroc k

an dlowe r overburde nplume

. 5.7. 1 GWT PMas s Remova l A s indicated , th e GWT Pi s n o longe r operating

. Therefore , n o TC V mas s remova l i s occurrin g a t th e Site

. However , t o maintai ndat acontinuity , th e cumulativ e GWT Pmas s remova l trend s ar e presente di n Figur e 5-9

.

TD03-00 6 5-1 8 Apri l 200 6

### Figur e 5- 9 Trend s i n TC V Mas s Remova l an dGallon s Treate db y Site Extractio n Well s

X * " P S 2 " t


### Monitorin g Even t

Notes : Monitorin g event s 1 -2 7 occurre dbetwee n Apri l 199 6 an dOctober 2002

. Monitorin g even t

2 8 occurre di n June/Jul y 2005

. Th e OVV'T Pha s bee nshutdow nsinc e th e !8 l f lmonitorin g event

. 

### 1,800,00 0

- 1,600,00 0 i

_ 

## 1,400,00 0 £

« 

## 1,200,00 0 a 

## L

. 1,000,00 0 » ?

- 800,00 0 g "g ,

S

. •— •

- 600,00 0 a )

E 400,00 0 3

O

- 200,00 0

- 0

- • TCV

- • TC E

- * DC E

- AV C

- - x - - gallon s

r : - m„ 

### Original s i n

5-1 96. 0 CONCLUSION S AN D RECOMMENDATION S

Base do n th e dat aobtaine ddurin g th e 28 t hmonitorin g event , th e followin g conclusion s an d recommendation s can b e draw nwit hrespec t t o th e objective s presente di n Sectio n1.0 :

• Hydrologica l impact s observe ddurin g th e 28 t hmonitorin g even t ar e consisten t

wit hthos e observe d durin g th e 27 t hmonitorin g event ;

• REA Lgroundwate r cleanu p standard s hav e bee n me t a t al l monitoring/extractio nwel l an d piezomete r

locations ;

• Sinc e RBAL s hav e bee nme t an dhydrologica l impact s ar e stable , additiona l (future ) groundwate r remediatio ni s no t

likel y needed ;

• Therefore , a s state di n th e ESD , EP A ma y wan t t o conside r

decommissionin g th e GWTP ; an d

• A s specifie di n th e ESD , groundwater , surfac e water , an dsedimen t qualit y shoul dcontinu e t o b e monitore dt o verif

y tha t th e conclusion s presente di n th e Phas e I I Ecologica l an dHuma nHealt hRis k Summar y Report

remai nvalid

.

TD03-00 6 6- 1 Apri l 200 67. 0 REFERENCE S

Foste r Wheele r Environmenta l Corporation

. 1996-2001

. Baselin e - Twenty-firs t Quarterl y Groundvvate r Repor t - Norwoo dPC B Superfun dSite

. Foste r Wheele r Environmenta l Corporation

. 1999

. Correspondence , Norwoo dPC B Superfun dSit e - Chlorinate dVolatil e Product-Daughte r Ratio s an dBiodegradation

. Jun e 24

. Nobi s Engineerin g Inc

. 2001-2002

. Twenty-secon dthroug hTwenty-sevent hQuarterl y Groundwate r Monitorin g Repor t

- Norwoo dPC B Superfun dSite

. Tetr aTec hEC , Inc

. 2004

. Phas e I I Ecologica l an dHuma nHealt hRis k Summar y Report

. July

. U.S

. Environmenta l Protectio nAgency , Regio nI - Ne w England

. 2005

. Explanatio no f Significan t Difference s fo r

th e Norwoo dPC B Superfun dSite , Norwood , MA

. Februar y 23

. Verschueren , K

. 1996

. Environmenta l Dat ao nOrgani c Chemicals

. Va nNostran dReinhold , Ne w York

.

TD03-00 6 7- 1 Apri l 200 6i 4

i I

TD03-00 6

Apri l 200 6 Appendi x A Summar y o f

Groundwate r

Samplin g Fiel dDat aAPPENDI X A
TABL E A- 1 Summar yo f Groundwate rSamplin g Fiel d Dat a
Wel l Numbe r MW-1 A MW-1B R MW-1B R MW-2 A MW-2 A MW-2 A MW-2 B MW-2 B MW-3A R MW-3 B MW-3I R MW-4 A MW-4 B MW-7 A MW-7 A MW-7 A MW-7 B MW-7 B MW-7 C MW-7 C MW-8 I MW-8 I MW-9 B MW-9 B B- 4 B- 4 B- 9 B-1 0 B-1 8 B-19 R Dat e

Sample d 6/7/200 5 6/7/200 5 7/13/200 5 6/9/200 5 6/16/200 5 7/ 1 3/200 5 6/9/200 5 6/16/200 5 6/8/200 5 6/9/200 5 6/8/200 5 6/8/200 5 6/8/200 5 6/9/200 5 6/ 1 5/200 5 7/13/200 5 6/9/200 5 6/ 1 5/200 5 6/9/200 5 6/16/200 5 6/9/200 5 6/16/200 5 6/10/200 5 6/17/200 5 6/6/200 5 7/ 1 3/200 5 6/8/200 5 6/8/200 5 6/7/200 5 6/2/200 5 Tim e

Sample d 164 6 151 0 152 0 170 0 115 0 094 0 162 0 122 0 162 0 104 0 172 0 125 7 125 5 132 5 140 0 103 0 134 0 134 0 134 0 105 0 110 0 111 5 125 0 101 5 100 5 131 5 131 0 113 0 144 0 142 5 Wate rLeve l

(f t TOC ) 11. 5 11.9 8 12.3 5 8.1 0 8.1 0 85 3 8.8 5 88 5 6. 7 7. 7 7.9 4 9. 7 1 0 10. 6 10. 2 10.6 2 10. 6 10. 6 9. 3 9. 3 11.2 5 10. 6 12. 6 12. 6 95 2 9.7 5 1 2 1 1 3 5 11.4 5 9.5 5 Wel l Dept h

(f t TOC ) 18.2 4 30.8 6 30.8 6 14. 1 14. 1 14. 1 3 8 1 3 8 1 15.0 2 80.1 7 388 7 13.2 1 45.7 6 18.5 8 18.5 8 185 8 42.1 3 42.1 3 888 3 888 3 62.7 8 62.7 8 372 2 372 2 16.6 8 16.6 8 195 8 17. 9 2 4 9 3 22.9 3 Wel l Dia

.

(in. ) 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 ' 2 2 1 2 2 2 2 Purg e Tim e

(min. ) 15 1 9 6 3 5 7 0 1 9 3 0 4 9 1 0 3 5 6 3 7 0 4 0 12 2 7 0 4 8 5 5 6 6 7 0 4 0 1 5 4 9 5 0 8 9 3 0 4 0 7 2 20 0 5 5 13 5 5 0 Tem p (C )

15. 8 19. 1 19 2 19. 9 14. 2 22. 2 18. 0 17. 5 16. 1 16. 1 14 9 18. 0 22. 4 13. 2 14. 5 18. 0 19. 1 12. 9 14. 6 12. 9 15. 4 14. 0 16. 9 15. 2 16. 8 2 1 2 18. 8 20. 2 21. 1 25. 8 Spec

. Cond

.

uS/c m 70 4 67 2 71 0 53 5 44 5 540 34 5 41 9 32 0 11 5 16 0 26 0 31 1 24 1 34 4 34 7 13 7 15 9 33 3 31 6 30 1 30 2 80 1 86 6 60 7 76 0 52 6 67 3 60 7 22 6 P H

5. 0 4. 6 5. 7 5. 7 5. 8 6. 1 6. 3 6 7 3.9 ' 6 4 6. 0 5 5 7 2 E R 5. 9 5. 6 5. 9 6. 2 7. 6 8. 1 7. 4 7 0 3.6 * 6. 5 5. 9 6. 1 5. 0 3.0 * 2.1

- 6. 4 ORPm V

19 0 61 7 20 0 24 2 45 5 17 9 15 7 1 6 65 1 19 1 41 2 38 7 23 0 58 7 9 1 7 55 2 5 5 38 8 6 2 -3 8 4 2 55 1 -1 8

- 4 -6 5 57 9 63 0 68 7 2 3 D.O

. mg/ L

0. 4 0. 4 0. 5 6. 3 6. 6 4. 7 1. 0 0. 4 8 9 3 3 0. 3 2. 0 2. 1 5. 5 2 5 0. 5 2. 1 2. 0 2. 6 0. 9 0. 6 0. 4 0. 4 0. 4 4. 7 2. 4 0. 4 0. 7 0. 7 9. 1 Turbidit y

NTU s 32 0 rE R 4 4 7. 4 21. 1 3. 1 E R E R E R 0 4 236 4 426. 7 6 9 E R 6. 7 E R 6 4 133. 4 1. 9 i 1. 8 15 9 2 8 E R 9 0 E R E R E R E R E R 23. 6 Comment s

Note s 1

. Piezometer s PZ- 1 t o PZ- 4 an d Monitorin g Wel l MW-12 B wer e sample d wit h a peristalti cpum p an d dedicate d tubing

. Al l othe rMonitorin g Well s

an d Extractio n Well s wer e sample d usin g a Grundfo s submersibl e pum p an d dedicate d tubing , 2 A| | we ll s wer e sample d fo rVOC s (3-4 0 m l vials)

. SVOC s (2- 1 Me rambe rbottles) , an d tota l PCB s {2- 1 iile i anibe i bottles ; i n adaition , well s B-4 , MvV

- i BR , EW- 4 an d MW-2 Awer e als o sample d fo rdissolve d PCB s ( 2 - 1 lite rambe rbottles ) 3 NS = No t Sampled , N/A = No t Applicable , NM = No t Measured , ER = Mete rMalfunction , TOC = To p o f Casing , NTU^Nephelometri cTurbidit yUni t 4

. Th e physica l an d geochemica l fiel d parameter s temperature , specifi cconducivity , pH , Oxidation/Reductio n Potentia l (ORP) , dissolve d oxyge n (DO) , an d turbidit ypresente d her e ar e th e fina l stabilize d reading s prio rt o sampl e collection

. 5

. Som e well s wer e resample d a s discusse d i n th e text

. 6

. * indicate s valu e i s belo wp h calibratio n rang e o f instrumen t an d i s suspect

.

A - 1APPENDI X A
TABL E A- 1 Summar yo f Groundwate rSamplin g Fiel d Dat a
Wel l Numbe r EW- 4 EW- 4 EW- 4 EW- 5 EW- 5 EW- 8 EW- 9 EW- 9 EW-1 0 EW-1 0 EW-1 1 EW-1 6 EW-1 7 EW-1 8 EW-1 8 ME- 2 ME- 3 ME- 4 ME- 5 ME- 8 ME- 8 ME- 9 ME-1 0 ME-11 A ME-11 B ME-12 A ME-12 B ME-18 B PZ- 1 PZ- 2 PZ- 3 PZ- 4 Dat e

Sample d 6/13/200 5 6/17/200 5 7/13/200 5 6/13/200 5 6/16/200 5 6/13/200 5 6/13/200 5 6/17/200 5 6/13/200 5 6/16/200 5 6/ 1 3/200 5 6/13/200 5 6/13/200 5 6/13/200 5 6/16/200 5 6/10/200 5 6/7/200 5 6/7/200 5 6/7/200 5 6/6/200 5 6/3/200 5 6/10/200 5 6/1/200 5 6/6/200 5 6/6/200 5 6/15/200 5 6/23/200 5 6/2/200 5 6/14/200 5 6/14/200 5 6/15/200 5 6/16/200 5 Tim e

Sample d 104 5 094 0 131 5 104 5 155 5 130 5 120 0 091 5 093 0 160 0 173 0 141 5 173 5 120 0 160 5 113 0 110 5 112 0 103 7 164 0 104 5 110 0 162 0 120 0 151 0 103 5 8.7 5 103 7 152 5 140 5 114 0 110 5 Wate rLeve l

(f t TOC ) 6.9 4 9.1 5 12.3 5 6.7 5 67 5 9.1 5 6. 7 6.7 5 6 5 6. 5 63 5 6. 7 6.6 6.6 5 6.6 5 8 8 5 10. 6 11. 8 5. 7 93 2 M M 8. 6 8. 2 9.5 1 9.6 1 79 8 12.8 9 9 6 2. 1 2.3 5 2. 1 3 5 Wel l Dept h

(f t TOC ) 11. 3 11. 3 11. 3 10. 3 10. 3 42.1 5 534 5 534 5 26. 5 26. 5 31. 5 27. 3 26.4 5 4 9 2 49 2 21.3 8 48.2 7 4 7 3 4 10.0 8 1 2 9 9 12.9 9 794 8 15.9 3 25.3 4 21.5 3 223 8 17.8 9 45.2 1 5. 0 5. 0 5. 0 5. 0 Wel l Dia

.

(in. ) 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 2 2 2 2 2 2 2 2 6 2 2 2 2 1 1 1 1 Purg e Tim e

(min ) 3 0 1 5 11 5 13 6 5 5 3 0 5 0 5 5 5 2 4 0 7 4 2 1 7 2 8 1 4 0 4 3 9 0 4 0 4 0 5 0 8 0 5 9 5 5 4 5 3 5 3 0 3 5 7 5 21 5 5 8 4 1 6 2 Tem p (C )

17. 4 15. 3 19 2 17. 6 16. 6 21. 4 16 5 14. 8 16 9 15. 6 17. 8 18. 1 18. 8 20. 3 18. 0 20. 5 17. 5 21. 0 19 2 14. 4 16. 2 15. 3 12. 5 15. 1 18. 6 12. 0 12. 4 15. 6 17 8 17. 0 14. 0 15. 4 Spec

. Cond

.

uS/c m 17 9 20 4 26 2 86 6 82 5 50 1 48 3 48 5 37 8 32 8 46 3 48 9 31 1 37 0 33 3 52 7 22 6 26 4 15 5 50 7 44 1 58 5 14 9 54 8 69 4 26 1 44 5 12 6 28 2 40 0 13 5 30 9 P H

5. 7 7. 4 6. 3 6.2 5. 8 7. 3 4. 1 7. 2 7 4 6. 6 7 2 5 6 1.7 " 7. 5 7. 7 6 5 6. 7 6. 1 6.2 6. 0 5. 1 7. 3 6. 6 5. 6 4. 1 5. 6 6. 3 6. 9 6 6 6 0 6 3 6. 4 OR P m V

46 0 13 7 19 3 31 7 4 5 -23 5 -6 8 -3 0 -26 7 -17 9 -22 9 -10 6 12 9 -24 4 -16 8 33 1 -2 6 41 1 30 8 -4 2 18 7 11 4 26 6 -8 6 40 2 24 4 -5 7 -2 2 -2 9 -9 6 26 7 -5 4 D.O

. mg/ L

8 3 7 8 5. 7 4. 9 6. 1 0 2 0. 6 2. 2 0. 2 0. 4 0. 2 0. 5 0. 8 0. 8 0. 6 0. 8 0 6 2. 9 2. 9 0. 2 1. 0 0. 4 4. 2 0. 4 0 7 0. 9 1. 0 4. 9 1. 0 0 2 0. 5 10. 6 Turbidit y

NTU s E R 7. 9 E R 7. 8 2. 5 251. 0 9. 0 7. 5 31. 9 4. 2 5. 9 E R 0. 1 39. 4 13. 0 113. 9 1167. 8 E R E R E R E R E R 5. 2 11. 2 10. 3 E R E R 30 2 20. 3 E R 2 9 11. 2 Comment s

N o recoveryi n wel l

PV C rise rben t - sample d w / peristalti cpum p

Note s 1

. Piezometer s PZ- 1 t o PZ- 4 an d Monitorin g Wel l MW-12 B wer e sample d wit h a peristalti cpum p an d dedicate d tubing

. Al l othe rMonitorin g Well s

an d Extractio n Well s wer e sample d usin g a Grundfo s submersibl e pum p an d dedicate d tubing , 2

. Al l well s wer e sample d fo rVOC s (3-4 0 m l vials) , SVOC s (2- 1 lite rambe rbottles) , an d tota l PCB s (2- 1 lite rambe rbottles)

. I n addition , well s B-4 , MW-1BR , EW- 4 an d MW-2 Awer e als o sample d fo rdissolve d PCB s ( 2 - 1 lite rambe rbottles)

. 3

. NS = No t Sampled , N/A = No t Applicable , NM = No t Measured , ER = Mete rMalfunction , TOC = To p o f Casing , NTU=Nephelometri cTurbidit yUni t 4

. Th e physica l an d geochemica l fiel d parameters temperature , specifi cconducivity , pH , Oxidation/Reductio n Potentia l (ORP) , dissolve d oxyge n (DO) , an d turbidit ypresente d her e ar e th e fina l stabilize d reading s prio rt o sampl e collection

. 5

. Som e well s wer e resample d a s discusse d i n th e text

. 6

. * indicate s valu e i s belo wp H calibratio n rang e o f instrumen t an d i s suspect

.

A - 2APPENDI X A TABL E A- 2 Summaryo f Dept h t o Groundwate rDat a Jul y13 , 200 5 Synchronou s Wate rLeve l Roun d
Wel l Numbe r MW-1 A MW-1B R MW-2 A MW-2 B MW-3A R MW-3 B MW-3I R MW-4A MW-4 B MW-5 A MW-5 B MW-6 A MW-6 B MW-7 A MW-7 B MW-7 C MW-8 I MW-9 B B- 4 B- 9 B-1 0 B-1 8 B-19 R B-2 8 EW- 4 EW- 5 EW- 8 EW- 9 EW-1 0 EW-1 1 EW-1 6 EW-1 7 EW-1 8 ME- 2 ME- 3 ME- 4 ME- 5 ME- 8 ME- 9 ME-1 0 ME-11 A ME-11 B ME-12 A ME-12 B ME-18 B Wate rLeve l

(f t TOC ) 11.8 3 12.3 5 8.5 3 9.1 1 7.1 4 8. 1 N M 10.52 10.7 1 N M 2.9 2 10.6 2 11.6 4 10.6 2 9. 6 10.9 3 11.1 5 12.8 2 9.7 5 12.4 2 11.9 6 11.9 2 10.2 5 8.7 4 6. 8 6.7 4 6.2 5 6.7 1 6.5 4 6.6 1 6.7 4 6.7 5 6.6 6 9.0 5 11.0 8 12. 4 10.6 6 9.4 4 8. 9 8.9 4 9. 8 9.6 1 12.2 2 12.8 9 10.2 5 Wel l Dept h

(f t TOC ) 18.2 4 30.8 6 14. 1 38. 1 15.0 2 80.1 7 38.8 7 13.2 1 45.7 6 N A N M N M N M 18.8 5 42.1 3 88.8 3 62.7 8 37.2 2 16.6 8 19.5 8 17. 9 24.9 3 22.9 3 N M 11. 3 10. 3 42.1 5 53.4 5 26. 5 31. 5 27. 3 26.4 5 49. 2 21.3 8 48.2 7 47.3 4 10.0 8 12.9 9 79.4 8 15.9 3 25.3 4 21.5 3 22.3 8 17.8 9 45.2 1 Comment s

Roa d Bo xFul l o f Wate r

Pave d Ove r

Notes : 1

. Measurement s mad e o n Jul y13 , 200 5

2

. N M = No t Measure d 3

. Piezomete rwate rlevel s wer e no t obtaine d sinc e th e piezometer s hav e no t bee n surveye d fo relevation

.

A - 3Appendi x B Laborator y Analytica l Dat a

TD03-00 6 Apri l 200 6NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 VO C DAT A

ANALYT E F Viny l Chlorid e 3 1 trans- 1 ,2-Dichloroethen e 1 ,2-Dichloroethen e (total ) 3, 6 cis- 1 ,2-Dichloroethen e > JBA L B- 4 B- 9 0,00 0 ' 2 9 1 U N Ai 2. 7 1 U 60,00 0 I 3 3 ' • 1 U N A; 2 9 M U Trichloroethen e 108,00 0 ' ! 1 3 , 1 U 1,1,2-Trichloroethan e • N A ; 1 U 1 U .Tetrachloroethen e • 37,00 0 ; 1 U : 1 U Chlorobenzen e • 1,1,2,2-Tetrachloroethan e i Tota l Detecte d Targe t VOC s \ N A; 3 0 ; 4. 3 N A1 U ; 1 U ; 103. 7 i 4. 3 B-1 0 B- 1 8 B-19- R EW- 4

3. 9 j 1 U : 1 U i 1 U 1 u ; 1 5. 4 : 1 J 1 U i 1 U

J 1 U I 1 U 4. 9 1 U 1 U ; 1 U 3. 7 1 J 1 U | 1 U 1 U : 1 U ; 1 U : 1 U
1 U ; 1 J 1 U j 1 U 7.9 1 U ! 1 U ; 1 U 1 U \ 1 U ! 1 U 1 U 20. 4 : 0 j o " o EW- 5 1 U 1 U 0.4 2 J 0.3 9 J 1. 3 1 U 1 U 1 U 1 U 1.6 9 EW- 8

2 4 6 9 77 0 65 0 2 0 U 2 0 U 2 0 U 2 0 U 2 0 U 74 3 EW- 9

7 4 15 0 230 0 200 0 42 0 6 3 U 6 3 U 6 3 U 6 3 U 264 4 EW-1 0

2 3 6 6 150 0 130 0 24 0 4 0 U 4 0 U 4 0 U 4 0 U 162 9 EW-1 1

6 5 J 7 6 U 190 0 170 0 260 0 3 1 J 7 6 U 7 6 U 7 6 U 439 6 EW-1 6

3 5 2 0 54 0 48 0 6 4 1 6 U 1 6 U 1 6 U 1 6 U 59 9 EW-1 7

1 2 3. 1 J 18 0 16 0 9 2 5. 2 U 5. 2 U 5. 2 U 5. 2 U 267. 1 EW-1 8

3 6 3. 7 J 18 0

. 17 0 1. 5 J 5. 2 U i 5. 2 U 5. 2 U 5. 2 U 211. 2

Al l sampl e concentration s i n ug/ L U = Non-detect J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l (ug/L ) N A= No t applicabl e 0 = N o Targe t Chlorinate d Volatile s (TCV ) detecte d TCV s wer e calculate d usin g 1,2-dichloroethen e (total) ; trans
- an d cis-1,2-dichloroethen e concentration s wer e ignored

.

Pag e 1 o f 6NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 VO C DATA

ANALYT E Viny l Chlorid e trans- 1 ,2-Dichloroethen e 1 ,2-Dichloroethen e (total ) cis- 1 ,2-Dichloroethen e Trichloroethen e 1,1,2-Trichloroethan e Tetrachloroethen e Chlorobenzen e 1 , 1 ,2,2-Tetrachloroethan e Tota l Detecte d Targe t VOC s REA L 310,00 0 N A 3,660,00 0 N A 108,00 0 N A 37,00 0 ME- 2

1 U 1 U 3. 1 2. 8 7. 6 1 U 1 U N Ai 1 U N A; 1 U : 10. 4 ME- 3

1 U 1 U 1 1 1 1 4 6 1 U 1 U 1 U 1 U 5 7 ME- 4 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U ME- 5

1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U ME- 8

9 3 2 9 37 0 33 0 11 0 1 1 U 1 1 U 1 1 U 1 1 U 0 j 0 56 2 ME- 9 4. 6 1 U 6. 7 6 1 U 1 U 1 U 1 U 1 U 10. 6 ME-1 0 ME-11 A

1 U 12 0 1 U 3 7 1 U ! 42 0 1 U I 37 0 1 U 2 0 1 U 1 1 U 1 U 1 1 U 1 U 1 1 U 1 U 1 1 U 0 54 7

. ME-11 B ME-11 B DU P 2 0 2 0 2. 8 2. 8 6 7 6 3 1. 8 U 1. 8 U 1. 8 U 4. 6 1. 8 U 89. 4 6 8

6 3 1. 8 U 1. 8 U 1. 8 U 4. 5 1. 8 U 90. 3 ME-12 AME- 1

1 U , 1 1 U ! 1 1 U i 1 1 U ' ; 1 1 U ' 1

1 U : 1 0.4 3 J 1 1 U 1 1 U 1 

### 0.4 3 

### ; o 2 B ME-18 B

U 1 U U 1 U U ; 1 U U • 1 U U 1 U U 1 U U 1 U U i 1 U U ; 1 U

'•0 MW-1 A

5 8 U : 5 8 U 5 8 U : 5 8 U 210 0 5 8 U ] 5 8 U j 5 8 U | 5 8 U j 210 0 '

Al l sampl e concentration s i n ug/ L U = Non-detec t J = Estimate d resul t D = Dilute d sampl e concentratio n REA L = Ris k

Base d Actio n Leve l (ug/L ) N A= No t applicabl e 0 = N o Targe t Chlorinate d Volatile s (TCV ) detecte d TCV s wer e calculate d usin g 1,2-dichloroethen e (total) ; trans
- an d cis-1,2-dichloroethen e concentration s wer e ignored

.

Pag e 2 o f 6NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 VO C DATA

ANALYT E Viny l Chlorid e trans- 1 ,2-Dichloroethen e 1 ,2-Dichloroethen e (total ) cis- 1 ,2-Dichloroethen e Trichloroethen e 1,1,2-Trichloroethan e Tetrachloroethen e Chlorobenzen e 1 , 1 ,2,2-Tetrachloroethan e Tota l Detecte d Targe t VOC s REA L 310,00 0 N A 3,660,00 0 N A 108,00 0 N A 37,00 0 N A N A MW-1B R

4 4 U 4 4 U 7 1 6 7 190 0 4 4 U 4 4 U 4 4 U 4 4 U 196 7 MW-2 A

1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 MW-2 B

7 0 4. 6 J 49 0 45 0 1 3 1 3 U 1 3 U 1 3 U 1 3 U 537. 6 MW-3A- R

1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 MW-3 B

1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 MW-3 B DUPLICA T 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 MW-3I- R

1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 MW-4 A 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 MW-4 B 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 MW-7 AM M

2 1 0.4 1 J : 1 5 0 ; 1 4 6 1 03 6 J 1 1 U : 1 1 U 1 1 U 1 1 U 1 48.7 7 -7 B MW-7 C

U • •1 U U : 1 U U ; 1 U U

. 1 U U , 1 U u : 1 u U : 1 U U 1 U U 1 U D ; 0 MW-8 I

1 U , 1 U 

### 2. 1 

### : 1

. 9 ; 3.5 i 1 U 1 U 1 U 1 U 5. 4

Al l sampl e concentration s i n ug/ L U = Non-detec t J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l (ug/L ) N A= No t applicabl e 0 = N o Targe t Chlorinate d Volatile s (TCV ) detecte d TCV s wer e calculate d usin g 1,2-dichloroethen e (total) ; trans
- an d cis-1,2-dichloroethen e concentration s wer e ignored

.

Pag e 3 o f 6NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 VO C DAT A

ANALYT E Viny l Chlorid e trans- 1 ,2-Dichloroethen e .1,2-Dichloroethen e (total ) cis- 1 ,2-Dichloroethen e Trichloroethen e 1,1,2-Trichloroethan e Tetrachloroethen e Chlorobenzen e 1 , 1 ,2,2-Tetrachloroethan e Tota l Detecte d Targe t VOC s REA L 310,00 0 N A 3,660,00 0 N A 108,00 0 N A 37,00 0 N A N A MW-9 B

1 U 1 U 0.3 8 J 0.3 5 J 1 U 1 U 1 U 1 U 1 U 0.3 5 PZ-0 1

2. 7 0. 7 J 1 9 1 7 0^5 3 J 1 U 1 U 0.4 4 J 1 U 21.3 7 PZ-0 2

9 1 3 4 91 0 79 0 1 0 J 2 3 U 2 3 U 2 3 U 2 3 U 92 5 PZ-0 3

8 4. 8 12 0 11 0 3. 7 U 3. 7 U 3. 7 U 3. 7 U 3. 7 U 122. 8 PZ-0 4

1 U 1 U 1. 4 1. 3 1. 5 1 U 1 U 1 U 1 U 2. 8 TB5280 5

1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 Tri p 5_31_0 5 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 Tri p 6_14_0 5 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 

# • V Tri p

6_14_0 5 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 Trip 6_14_0 5 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 Tri p 6_14_0 5 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 Tri p 6_14_0 5 1 U 1 i f 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0

Al l sampl e concentration s i n ug/ L U = Non-detec t J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l (ug/L ) N A= No t applicabl e 0 = N o Targe t Chlorinate d Volatile s (TCV ) detecte d TCV s wer e calculate d usin g 1,2-dichloroethen e (total) ; trans
- an d cis-1,2-dichloroethen e concentration s wer e ignored

.

Pag e 4 o f 6NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 VO C DAT A

ANALYT E R Viny l Chlorid e 3 1 Tri p Tri p BA L 6_14_0 5 6_15_0 5 3,00 0 ; • 1 U i 1 U trans-1,2-Dichloroethen e ; 'N Ai 1 U

. 1 U ;1,2-Dichloroethen e (total ) 3,660,00 0 1 U 1 U cis-1,2-Dichloroethen e ; N A ; ' 1 U , 1 U Trichloroethen e I 1 0 3,00 0 1 U i 1 U

; 1,1,2-Trichloroethan e N A1 U

. 1 U Jetrachloroethen e \ 37,00 0 1 U 1 U Chlorobenzen e ; N A! 1 U ; 1 U ;l,1,2,2-Tetrachloroethan e ; N A : 1 U > 1 U Tota l Detecte d Targe t VOC s j ; 0 : 0 Tri p 6_15_0 5 Tri p

6_15_0 5 1 U j 1 U 1 U i 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U

1 U 1 U 1 U 1 U 1 U 0 | 0 Tri p

6 1 3 0 5 F 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 Tri p 6 1 4 0 5 E Tri p

Blan k Tri p

Blan k 07 1 1 U 1 U ; 4 4 U 1 U I 1 U 1 U , 1 U 1 U 

### 1 V 1 U 1 U 1 U 1 U 0 1 U

1 U 1 U 1 U 1 U 1 " U 0 4 4 U

4 4 U 4 4 U 4 4 U 4 4 U 4 4 U 4 4 U 4 4 U 0 Tri p Blan k 5_ 2 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 Tri p Blan k 6_ 1 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 Tri p Blan k 6_ 2 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0

Al l sampl e concentration s i n ug/ L U = Non-detec t J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l (ug/L ) N A= No t applicabl e 0 = N o Targe t Chlorinate d Volatile s (TCV ) detecte d TCV s wer e calculate d usin g 1,2-dichloroethen e (total) ; trans
- an d cis-1,2-dichloroethen e concentration s wer e ignored

.

Pag e 5 o f 6NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 VO C DAT A

Al l sampl e concentration s i n ug/ L U = Non-detec t J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l (ug/L ) N A= No t applicabl e 0 = N o Targe t Chlorinate d Volatile s (TCV ) detecte d TCV s wer e calculate d usin g 1,2-dichloroethen e (total) ; trans
- an d cis-1,2-dichloroethen e concentration s wer e ignored

.

ANALYT E Viny l Chlorid e trans- 1 ,2-Dichloroethen e 1,2-Dichloroethen e (total ) cis- 1 ,2-Dichloroethen e Trichloroethen e 1,1,2-Trichloroethan e Tetrachloroethen e Chlorobenzen e 1 , 1 ,2,2-Tetrachloroethan e Tota l Detecte d Targe t VOC s RBA L 310,00 0 N A 3,660,00 0 N A 108,00 0 N A 37,00 0 N A N A Tri p

Blan k 6_ 9 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 Tri p Blan k 6_ 1 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 1 U 0 Tri p Blan k 6_ 1 1 U 1 U 1 U 1 U 1 U 

# ru 1 U 1 U 1 U 0 Trip Blan k A6 1 U 1 U 1 U 1 U 

### 1 " u i u 1 U 1 U 1 U 0

Pag e 6 o f6
INORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 SVO C DAT

A

ANALYT E R B A L B- 4 B- 9 1 ,3-Dichlorobenzen e j N A' 5 U 5 U 1 ,4-Dichlorobenzen e ; 4,60 0 ; 5 U 7. 6 1 ,2-Dichlorobenzen e \ N A: 5 U ; 5 U 1,2,4-Trichlorobenzen e • 34,00 0 ! 5 U ; 5 U Pentachloropheno l N Tota l Detecte d Targe t SVOC s \ A| 1 3 U 1 3 U

, 0 ; 7. 6 B-1 0 5 U 7. 2 5 U 5 U 1 3 U 7. 2 B-1 8

5 U 5 U 5 U 1 2 1 3 U 1 2 B-19- R 5 U 5 U 5 U 5 U 1 3 U 0 EW- 4 5 U 5 U 5 U 5 U 1 3 U 0 EW- 5 5 U 5 U 5 U 5 U 1 3 U 0 EW- 8 5 U 5 U 5 U 5 U 1 3 U 0 EW- 9 EW-1 0 5 U ; 5 U 5 U i 5 U 5 U ; 5 U 5 U 5 U 1 3 U 1 3 U 

### " d ! 

### o EW-1 1

5 U 2 8 2 1 14 0 D 1 3 U 18 9 EW-1 6

5 U 5 U 5 U 1 7 1 3 U 1 7 EW-1 7 5 U 5 U 5 U 5 U 1 3 U 0 EW-1 8 5 U 5 U 5 U 5 U 1 3 U 0 ME- 2 5 U 5 U 5 U 5 U 1 3 U 0

Al l sampl e concentration s i n ug/ L U = Non-detec t J = Estimate d resul t D = Dilute d sampl e concentratio n REA L = Ris k

Base d Actio n Leve l (ug/L ) N A= No t applicabl e 0 = N o Targe t SVOC s detecte d

Pag e 1 o f 3NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 SVO C DAT

A

ANALYT E 1 ,3-Dichlorobenzen e 1,4-Dichlorobenzen e 1 ,2-Dichlorobenzen e 1 ,2,4-Trichlorobenzen e Pentachloropheno l Tota l Detecte d Targe t SVOC s RBA L N A 4,60 0 N A 34,00 0 N A ME- 3 5 U 5 U 5 U 5 U 1 3 U 0 ME- 4 5 U 5 U 5 U 5 U 1 3 U 0 ME- 5 5 U 5 U 5 U 5 U 1 3 U 0 ME- 8 5 U 5 U 5 U 5 U 1 3 U 0 ME- 9 5 U 5 U 5 U 5 U 1 3 U 0 ME-1 0 5 U 5 U 5 U 5 U 1 3 U 0 ME-11 A 5 U 5 U 5 U 5 U 1 3 U 0 ME-11 B 5 U 5 U 5 U 5 U 1 3 U 0 ME-11 B DU P 5 U 5 U 5 U 5 U 1 3 U 0 ME-12 A 5 U 5 U 5 U 5 U 1 3 U 0 ME-12 B 5. 1 U 5. 1 U 5. 1 U 5. 1 U 1 3 U 0 ME-18 B 5 U 5 U 5 U 5 U 1 3 U 0 MW-1 A

1 5 2 5 J 3 0 J 150 0 D 1 3 U 157 0 MW-1B R

1 7 20 0 D 2 7 110 0 1 3 U 134 4 MW-2 A

5 U 5 U 5 U 5 U 1 3 U 0 MW-2 B 5 U 5 U 5 U 5 U 1 3 U 0

Al l sampl e concentration s i n ug/ L U = Non-detec t J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l (ug/L ) N A= No t applicabl e 0 = N o Targe t SVOC s detecte d

Pag e 2 o f 3NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 SVO C DATA

ANALYT E 1 ,3-Dichlorobenzen e 1,4-Dichlorobenzen e 1 ,2-Dichlorobenzen e 1 ,2,4-Trichlorobenzen e Pentachloropheno l Tota l Detecte d Targe t SVOC s REA L N A 4,60 0 N A 34,00 0 N A MW-3A- R

5 U 5 U 5 U 5 U 1 3 U 0 " MW-3 B

5 U 5 U 5 U 5 U 1 3 U 0 MW-3 B

DU P 5 U 5 U 5 U 5 U 1 3 U 0 MW-3I- R

5 U 5 U 5 U 5 U 1 3 U 0 MW-4 A 5 U 5 U 5 U 5 U 1 3 U 0 MW-4 B 5 U 5 U 5 U 5 U 1 3 U 0 MW-7 A 5 U 5 U 5 U 5 U 1 3 U 0 MW-7 B 5 U 5 U 5 U 5 U 1 3 U 0 MW-7 C 5 U 5 U 5 U 5 U 1 3 U 0 MW-8 I 5 U 5 U 5 U 5 U 1 3 U 0 MW-9 B 5 U 5 U 5 U 5 U 1 3 U 0 PZ-0 1 5 U 5 U 5 U 5 U 1 3 U 0 PZ-0 2 17 0 D 1 7 7. 4 120 0 D 1 3 U 1394. 4 PZ-0 3

5 U 5 U 5 U 8. 3 1 3 U 8. 3 PZ-0 4

5 U 5 U 5 U 5 U 13 ' U 0

Al l sampl e concentration s i n ug/ L U = Non-detec t J = Estimate d resul t D = Dilute d sampl e concentratio n REA L = Ris k

Base d Actio n Leve l (ug/L ) N A= No t applicabl e 0 = N o Targe t SVOC s detecte d

Pag e 3 o f 3NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 PC B DATA

ANALYT E RBA L B- 4 B-4F * B- 9 B-1 0 B

Aroclor-101 6 i N A1. 5 U 0.0 5 U i 0.0 5 U 0.0 5 U 0.0 5 Aroclor-122 1 ; N A1. 5 U 0.0 5 U 0.0 5 U ; 0.0 5 U ! 0.0 5 Aroclor-123 2 ! N A1. 5 U 0.0 5 U 0.0 5 U ! 0.0 5 U ! 0.0 5 Aroclor-124 2 , N A: 1. 5 U 0.0 5 U 0.0 5 U \ 0.0 5 U | 0.0 5 Aroclor-124 8 ; N A2 2 0.2 9 J 0. 1 J ; 1. 3 : 0.1 8 Aroclor-125 4 I N A; 8 I 0.3 6 0.1 7 J : 3 J 0. 1 Aroclor-126 0 I N Aj 1. 5 U 6.0 5 U 0.0 5 U i 0.0 5 U ' , 6.0 5 Tota l detecte d PCB s ; 3 0 i 0.6 5 ; 0.2 7 4. 3 O. C B-1 8 1 8 DU P B-19- R EW- 4 EW-4F * EW- 5 EW- 8 EW- 9 U 0.0 5 U : 0.2 5 U 0.2 5 U 0.0 5 U ; 0.0 5 U I 0.0 5 U 0.0 5 U U 0.0 5 U : 0.2 5 U 0.2 5 U 0.0 5 U ' 0.0 5 U 0.0 5 U 0.0 5 U U 0.0 5 U • 0.2 5 U 0.2 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U U 0.0 5 U ; 0.2 5 U 0.2 5 U 0.0 5 U 0.0 5 U '•• 0.0 5 U ' • 0.0 5 U J 0.1 6 J : 3. 1 0.2 5 U 0.0 5 U 0.2 9 0.0 5 U 0.0 5 U 7 0.1 8 1. 1 2. 7 0.0 5 U 0.1 4 J 0.0 5 U 0.0 5 U U 0.0 5 U : 0.2 5 U 0.2 5 U 0.0 5 U : 0.0 5 U : 0.0 5 U 0.0 5 U ! 5 0.3 4 : 4. 2 2. 7 0 ; 0.4 3 ; 0 0 EW-1 0 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 EW-1 1 0.0 5 U ! 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0

Al l sampl e concentration s i n ug/ L U = Non-detect J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l N A= No t applicabl e 0 = N o PCB s detecte d

* Represent s filtere d sampl e (e.g. , dissolve d PCBs ) Remainin g sample s ar e unfiltere d (e.g , tota l PCBs )

Pag e 1 o f 5NORWOO D GROUNDWATE R MONITORIN G JUNE/JULY200 5 PC B DATA

ANALYT E Aroclor-101 6 Aroclor-122 1 Aroclor-123 2 Aroclor-124 2 Aroclor-124 8 Aroclor-125 4 Aroclor-126 0 Tota l detecte d RGB s RBA L N A N A N A N A N A N A N A EW-1 6

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 EW-16F * 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 EW-1 7 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 EW-1 8 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 ME- 2 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.1 2 0.0 5 U 0.1 2 ME- 3

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 ME- 4 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 ME- 5 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 ME- 8 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U " 0.0 5 U 0 ME- 9 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 ME-1 0 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.4 5 0.0 5 U 0.4 5 ME-11 A

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 ME-11 B 0.2 5 U 0.2 5 U 0.2 5 U 0.2 5 U 1. 9 0.2 5 ~ U 0.2 5 U 1. 9 ME-11 B

DU P 0.2 5 U ' 0.2 5 U 0.2 5 U 0.2 5 U 1. 9 : "6.2 5 I P 0.2 5 U i 1. 9

Al l sampl e concentration s i n ug/ L U = Non-detect J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l N A= No t applicabl e 0 = N o PCB s detecte d

* Represent s filtere d sampl e (e.g. , dissolve d PCBs ) Remainin g sample s ar e unfiltere d (e.g , tota l PCBs )

Pag e 2 o f 5NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 PC B DATA

ANALYT E RBA L Aroclor-101 6 N A Aroclor-122 1 N A ;Aroclor-123 2 ' N A Aroclor-124 2 i N A Aroclor-124 8 : N A Aroclor-125 4 • N A Aroclor-126 0 ; N A Tota l detecte d PCB s ME-12 A 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 ME-12 B

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 ME-18 B

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.3 2 0.0 5 U 0.3 2 MW-1 A

2. 5 U 2. 5 U 2. 5 U 2. 5 U 2 3 2. 5 U 2. 5 U 2 3 MW-1B R

2. 5 U 2. 5 U 2. 5 U 2. 5 U 1 2 7. 6 J 2. 5 U 19. 6 MW-1BRF *

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 MW-2 A

2. 5 U 2. 5 U 2. 5 U 2. 5 U 2. 5 U 1 5 J 2. 5 U 1 5 MW-2AF *

0.0 5 U 0.0 5 U 0.0 5 U 6.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 MW-2 B

0.0 5 U 0.0 5 U 0.0 5 U "6.05 " U " 0.0 5 U 0.0 5 U 0.0 5 U 0 MW-3A- R 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 MW-3 B 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 MW-3 B

DU P 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 MW-3I- R

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 MV\M A

0.2 5 U 0.2 5 U 0.2 5 U 0~2 5 I T 0.2 5 U 1. 1 0.2 5 U

_^ H

Al l sampl e concentration s i n ug/ L U = Non-detec

t J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l N A= No t applicabl e 0 = N o PCB s detecte d

* Represent s filtere d sampl e (e.g. , dissolve d PCBs ) Remainin g sample s ar e unfiltere d (e.g

. tota l PCBs )

Pag e 3 o f 5NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 PC B DATA

ANALYT E RBA L Aroclor-101 6 ; N A Aroclor-122 1 j N A Aroclor-123 2 j N A Aroclor-124 2 ] N A Aroclor-124 8 i N A Aroclor-125 4 f N A Aroclor-126 0 ] N A Tota l detecte d PCB s ! MW-4 B 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 6 J 0.0 5 U 0.0 6 MW-7 A

0.0 5 U 0.0 5 U 0.0 5 U r b.b s u 0.0 5 U 0.0 5 U 0.0 5 U 0 MW-7 B 0.06 U 0.0 6 U 0.0 6 U 0.0 6 U 0.0 6 U 0.0 6 U 0.0 6 U 0 MW-7 C 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U HD.OS u 0.0 5 U 0.0 5 U 0 MW-8 I 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 MW-9 B 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 PZ-0 1

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 PZ-0 1 F *

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 PZ-0 1 F *

DU P 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 PZ-0 2 2. 5 U 2. 5 U 2. 5 U 2. 5 U 1 7 J 1 7 2. 5 U 3 4 PZ-02F * 2. 5 U 2. 5 U 2. 5 U 2. 5 U 1 0 J 1 3 2. 5 U 2 3 PZ-0 3

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 3 0.0 5 U 0.0 5 U 3 PZ-03F '

0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0 PZ-0 4 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.2 4 J 0.2 6 0.0 5 U 0. 5

Al l sampl e concentration s i n ug/ L U = Non-detect J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l N A= No t applicabl e 0 = N o PCB s detecte d

• Represent s filtere d sampl e (e.g. , dissolve d PCBs ) Remainin g sample s ar e unfiltere d (e.g , tota l PCBs )

Pag e 4 o f 5NORWOO D GROUNDWATE R MONITORIN G JUNE/JUL Y200 5 PC B DATA

ANALYTE Aroclor-101 6 Aroclor-122 1 Aroclor-123 2 Aroclor-124 2 Aroclor-124 8 Aroclor-125 4 Aroclor-126 0 RBA L N A N A ""N A N A N A N A N A PZ-04F *

0.0 5 U | 0.0 5 U 0X1 5 U 0.0 5 U 0.0 5 U 0.0 5 U 0.0 5 U i Tota l detecte d PCB s

_ | >

Al l sampl e concentration s i n ug/ L U = Non-detect J = Estimate d resul t D = Dilute d sampl e concentratio n RBA L = Ris k

Base d Actio n Leve l N A= No t applicabl e 0 = N o PCB s detecte d

* Represent s filtere d sampl e (e.g.

. dissolve d PCBs ) Remainin g sample s ar e unfiltere d (e.g

. tota l PCBs )

Pag e 5 o f 5« H

TD03-00 6 Apri l 2006 Appendi x C QA/Q C Dat aRevie w

### QA/Q C DAT A REVIE W NORWOO D June/Jul y 200 5 Dat a INTRODUCTIO N Th e followin g i s asummar y o f th e qualit y contro l dat arevie w performe db y aTetr aTec hE C chemis t o n th e result s o f

groundwate r

sample s collecte db y Watermar k durin g th e June/Jul y 200 5 samplin g roun da t th e Norwoo dPC B Superfun dSit e (Site)

. Sample s wer e analyze db y Sever nTren t Laboratorie s i n Colchester , V T fo r

selecte dvolatil e organic s (VOC s - EP A Metho d8260B) , selecte dsem i volatil e organic s (SVOC s - EP A Metho d8270C) , an dlo w leve l PCB s (EP A Metho d8082)

. Tabl e C- l provide s a lis t o f sample s collecte dan danalyse s performed

.

Tabl e C-l

. Sample s Collecte dan dAnalyse s Performe d

SAMPL ENUMBE R TB5280 5 MWME1 0 MW18 B MWB-19 R MW-1 A 

### MW-1B R MW-1BR F Tri p 5- 3 1-0 5 ME- 3 ME- 5 B-1 8 

### B-18DU P ME- 4 

### Tri p Blan k

1 B- 4 

### B-4 F ME-11 A Tri p Blan k

6

- 1-0 5 ME-11 B ME-11BDU P ME- 8 

### Tri p Blan k

2 Tri p Blan k

3 B- 9 B-1 0 

### MW-4 B MW-4 A TRIPBLAN K

5.28.0 5 MW-3A R MW-3I R TRIPBLAN K

6.2.0 5 MW-3 B 

### SD G 

### NW0 1 NW0 1 NW0 1 NW0 1 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 2 NW0 3 NW0 3 NW0 3 NW0 3 NW0 3 NW0 3 NW0 3 NW0 3 NW0 3 DAT E COLLECTE D 5/28/0 5 6/1/0 5 6/2/0 5 6/2/0 5 6/7/0 5 6/7/0 5 6/7/0 5 6/7/0 5 6/7/0 5 6/7/0 5 6/7/0 5 6/7/0 5 6/7/0 5 5/31/0 5 6/6/0 5 6/6/0 5 6/6/0 5 6/6/0 5 6/6/0 5

_6/6/0 5 6/6/0 5 5/31/0 5 6/1/0 5 6/8/0 5 6/8/0 5 6/8/0 5 6/8/0 5 6/8/0 5 6/8/0 5 6/8/0 5 6/8/0 5 6/9/0 5 LA B I D



### 62341 6 62341 7 62341 8 62341 9 62414 9 62415 0 62415 1 62415 2 62415 3 62415 4 62415 5 62415 6 62415 7 62415 8 62415 9 62416 0 62416 1 62416 2 62416 3 62416 4 62416 5 62416 6 62416 7 62473 6 62473 7 62473 8 62473 9 62474 0 62474 1 62474 2 62474 3 62474 4 Q C

T B

M S

T B

F D


### T B

T B
FD
TB T B

T B

T B 

## vo c

X X X X X

X X X X

X X

X X X X X X X X X X X X X X X X 

### SVO C

X X X X

X X X

X

X

X X X

X X X X

X X

X PC B

X X X X X X

X X X X X

X X X

X X X

X X X X

X X

X C- l

### Tabl e C-l

. Sample s Collecte dan dAnalyse s Performe d

SAMPL ENUMBE R MW-3 B DUPLICAT E MW-8 I MW-7 A MW-7 C TRI PBLAN K

6.9.0 5 

### ME- 9 ME- 2 TRI PBLAN K

6.9.0 5 

### PZ-0 1 PZ-01 F PZ-0 1 FDU P Tri p Blan k

A 6- 1 4-0 5 

### EW- 8 Tri p Blan k

6- 1 3-0 5 B 

### EW-1 7 Tri p Blan k

6

- 1 3 -0 5 D PZ- 2 

### PZ-2 F Tri p 6- 1 4-0 5 E EW-1 1 

### Tri p Blan k

6

- 1 3 -0 5 C PZ-0 3 PZ-03 F Tri p Blan k

6-15-0 5 G 

### M E12 A Tri p Blan k

6

- 1 5 -0 5 - H 

### EW-1 6 EW-16 F Tri p 6- 1 3-0 5 F MW2 B TRI P6

. 14.05(1 ) MW8 I TRIP6.14.05(K ) 

### EW-1 0 TRIP6.15.05(Q ) MW-7 A TRTPBLAN K

6.15.05(0 ) PZ-0 4 TRIP6.14.05(M ) PZ-04 F 

### EW-1 8 TRTP6.15.05(P ) 

### EW- 5 TRIP6.15.05(R ) MW-7 C 

### SD G
NW0 3 NW0 3 NW0 3 NW0 3 NW0 3 NW0 3 NW0 3 NW0 3 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 4 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 DAT E COLLECTE D 6/9/0 5 6/9/0 5 6/9/0 5 6/9/0 5 6/9/0 5 6/10/0 5 6/10/0 5 6/9/0 5 6/14/0 5 6/14/0 5 6/14/0 5 6/14/0 5 6/13/0 5 6/13/0 5 6/13/0 5 6/13/0 5 6/14/0 5 6/14/0 5 6/14/0 5 6/13/0 5 6/13/0 5 6/15/0 5 6/15/0 5 6/15/0 5 6/15/0 5 6/15/0 5 6/13/0 5 6/13/0 5 6/13/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 

### LA B I D

62474 5 62474 6 62474 7 62474 8 62474 9 62475 0 62475 1 62475 2 62498 0 62498 1 62498 2 62498 3 62498 4 62498 5 62498 6 62498 7 62498 8 62498 9 62499 0 62499 1 62499 2 62499 3 62499 4 62499 5 62499 6 62499 7 62499 8 62499 9 62502 1 62523 1 62523 2 62523 3 62523 4 62523 5 62523 6 62523 7 62523 8 62523 9 62524 0 62524 1 62524 2 62524 3 62524 4 62524 5 62524 6 

### Q C

F D



### T B

T B

F D 

### TB
T B
T B

T B
T B

T B
T B M S M S T B
T B
T B
T B
TB
T B



### TB
T B 

# vo c

X

X X X X X

X X X X X X

X X X X

X X X X

X X X X X X X X X X X

X X X X X 

# svo c

X X X X

X X

X

X

X

X

X

X

X

X

X

X

X

X

X

X X

X

X 

### PC B

X X X X

X X

X X X

X

X

X X

X

X X

X

X X

X

' X

X

X

X X

X

X C- 2

### Tabl e C-l

. Sample s Collecte dan dAnalyse s Performe d

SAMPL ENUMBE R TRIP6.14.05(C ) MW-2A(MS/MSD ) MW-2A F TRIP6.14.05(J ) MW-7 B TRI PBLAN K

6

. 15.05(N ) 

### EW- 9 Tri p 6.14.05(8 ) MW-9 B Tri p Blan k

6/ 1 7/0 5 EW- 4 

### EW-4 F ME-12 B TRI PBLAN K MW-2 A MW-7 A EW- 4 B- 4 

### MW-1B R Tri p Blan k

0 7 130 5 

### SD G

NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 5 NW0 6 NW0 6 NW0 6 NW0 6 NW0 6 NW0 6 NM0 7 NM0 7 NW0 8 NW0 8 NW0 8 NW0 8 NW0 8 NW0 8 DAT E COLLECTE D 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/16/0 5 6/17/0 5 6/17/0 5 6/17/0 5 6/17/0 5 6/17/0 5 6/17/0 5 6/23/0 5 6/23/0 5 7/13/0 5 7/13/0 5 7/13/0 5 7/13/0 5 7/13/0 5 7/13/0 5 LA B I D



### 62524 7 62524 8 62524 9 62525 0 62525 8 62525 9 62574 3 62574 4 62574 5 62574 6 62574 7 62574 8 62625 3 62625 4 62880 5 62880 6 62880 7 62880 8 62880 9 62881 0 

### Q C

T B M S
T B
T B
T B
T R

T B

T B 

## vo c

X

X X X X X X X

X X X

X X X X 

### SVO C

X

X

X

X

X

X X X PC B

X X

X

X

X

X X X

X



### T B - Tri p Blan k F D - Fiel dDuplicat e Sampl e M S - Matri x Spike/Matri x Spik e Duplicat e DAT A REVIE W Th e sample s wer e evaluate dbase do nth e followin g parameters : Technica l Holdin g Times/Sampl e Preservatio n * Metho dBlanks/Tri p Blank s Field/Laborator y Duplicate s * Initia l an dContinuin g Calibration s Matri x Spike/Matri x Spik e Duplicate s Surrogat e Recovery Interna l Standar dArea s Targe t Compoun dIdentificatio n Laborator y Contro l Sample s

* Al l criteri awer e me t

fo r thi s parameter

. Technica l Holdin g Times/Sampl e Preservatio n Sampl e bottle s fo r

MW-7A , MW-7 C an dMW-8 I wer e receive dou t o f th e acceptabl e temperatur e rang e o n6/13/0 5 (NW03)

. Thes e sample s wer e recollecte do n6/16/0 5 (NW05 ) an d7/13/0 5 (NW08 ) an d reanalyzed

. Th e result s fro mth e resamplin g an dreanalysi s ar e use di nth e projec t databas e fo r

thi s monitorin g event

. 

### C- 3

### Laborator y Metho dBlanks/Tri p Blank s

Th e result s fo r

th e laborator y metho dblan k sample s an dth e VO A tri p blan k sample s ar e foun dt o mee t th e dat aqualit y objective s (targe t analyte s < reportin g limit)

. Ther e i s n o limitatio ni nusin g th e dat adu e t o blan k contamination

. Matri x Spike/Matri x Spik e Duplicate s SVOC s Th e recover y o f

1,4-dichlorobenzen e (33% , 40%) , 1,2-Dichlorobenzen e (33% , 33%) , 1,2,4

- trichlorobenzen e (400% , 400% ) an dpentachloropheno l (127% ) i nth e matri x spik e an dmatri x spik e duplicat e sample s fo r

SVO C analysi s o f

MW-1 A d o no t

mee t th e acceptabl e criteria

. Th e concentratio n fo r 1,2,4-trichlorobenzen e i nsampl e MW-1 A i s 150 0 ug/L , 10 0 x th e concentratio nadde di nth e spike

. Th e recoverie s o f

PC B spike s i nsampl e MW-1 A ar e 0 % du e t o th e hig hinitia l concentratio ni nth e sample

. Th e PC B matri x spik e recoverie s fo r sampl e MW-1 A ar e no t usabl e fo r

evaluatin g sampl e accurac y fo r

thi s dat aset

. Th e result s fo r 1,4-dichlorobenzen e an d1,2-dichlorobenzen e ar e estimate ddu e t o th e lo w bia s i n th e reporte dresults

. Th e no n detec t resul t fo r pentachloropheno l i n sampl e MW-1 A i s no t impacte db y th e hig hrecovery i nth e matri x spik e sampl e Th e recover y fo r

1,4-dichlorobenzen e (113% , 113% ) an dpentachloropheno l (127% ) i nth e matri x spike an dmatri x spik e duplicat e sampl e EW-1 6 ar e abov e th e acceptabl e criteria

. Th e no ndetec t result s fo r 1,4-dichlorobenzen e an dpentachloropheno l i nsampl e EW-1 6 ar e no t impacte db y th e hig hrecovery i n th e matri x spik e an dmatri x spik e duplicat e samples

. PCB s Th e spik e result s fo r

PCB s i nsamples MW-2 A ar e dilute dou t du e t o th e hig hconcentratio ni nth e initia l sampl e requirin g a5 0 fol ddilutio nfo r analysis

. Ther e i s n o impac t o nth e usabilit y o f

th e data

. Surrogat e Recover y SVOC s Th e surrogat e nitrobenzen e (183% ) wa s recovere dabov e th e acceptabl e limit s fo r th e SVO C analysi s o f sampl e MW-1 A an dth e associate dmatri x spik e an dmatri x spik e duplicat e samples

. Th e SVO C surrogate , fluorobipheny l i s recovere dbelo w th e acceptabl e criteri ai n sampl e MW-7 C (54%)

. Sinc e al l o f th e othe r surrogate s ar e recovere dwithi nth e acceptabl e limit s ther e i s no t impac t o nth e usabilit y o f

th e data

. Th e surrogat e 2-fluorobipheny l i s recovere dbelo w th e acceptabl e limi t i nsample s PZ-0 1 (52%) , EW-0 8 (54% ) an dEW-1 6 (55%)

. Sinc e al l o f th e remainin g SVO C surrogate s hav e recoverie s withi nth e acceptabl e rang e ther e i s n o impac t o nth e usabilit y o f

th e data

. PCB s Th e surrogat e recovery fo r tetrachloro-m-xylen e i nsampl e MW-1BR F(135% ) i s recovere dabov e th e acceptabl e criteria

. Th e no ndetec t result s fo r

PCB s i nsampl e MW-1B Far e no t impacte db y th e hig h surrogat e recovery . Fiel dDuplicat e Fou r fiel dduplicat e sample s (B-l8 , MW- 1 IB , MW-3 B an dPZ-01F ) wer e collecte dfo r PC B analysi s an d tw o fiel dduplicat e sample s (ME- 1 I B an dMW-3B ) wer e collecte dfo r VO C an dSVO C analysis

. Al l o f 

### C- 4th e fiel dduplicat e result s ar e foun dt o mee t th e dat aqualit y objective s an dther e ar e n o limitation s du e t o samplin g an danalytica l precisio no nusin g th e data

. Laborator y Contro l Sampl e VOC s Th e recovery o f

tetrachloroethen e i nth e soli dlaborator y contro l sampl e wa s abov e th e acceptabl e criteri a range . Sinc e th e sampl e resul t fo r th e soli dsampl e i s no ndetec t ther e i s n o impac t

o nth e usabilit y o f

th e dat adu e t o th e hig hbia s i nth e reporte dconcentrations

. SVOC s Th e recover y fo r

pentachloropheno l i nth e SVO C laborator y contro l sampl e fo r SD GNW-0 6 wa s abov e th e acceptabl e rang e (115%)

. Th e no ndetec t result s fo r

pentachloropheno l i nth e sample s i s no t impacte d b y th e hig hbia s i n th e LC S sample

. Targe t Compoun dIdentificatio n PCB s Th e laborator y note di nit s narrativ e tha t th e Aroclo r

patter ni nsome o f

th e sample s di dno t

matc hwit h th e patter nfo r

Aroclo r 124 8 i nth e standard s used

. Thi s differenc e i s likel y du e t o th e weatherin g an d mak e u p o f

th e contaminan t

sourc e a t th e site

. Th e colum ncompariso ndat afo r Aroclo r 124 8 i nsample s B-1 8 (66.7%) , B-1 8 Du p (68.8% ) an dB-4 F (37.9% ) d o no t

mee t th e acceptabl e criteri a( < 25% ) fo r dua l colum nconfirmation

. Th e result s fo r Aroclo r 125 4 i nsample s B-1 0 (26.7%) , B- 9 (29.4% ) an dMW-4 B (32.7% ) an dfo r Aroclo r 124 8 i n sampl e B- 9 (192.9% ) d o no t mee t th e acceptabl e criteri afo r dua l colum nconfirmation

. Th e dat afo r Aroclo r 124 8 i nsample s PZ-0 2 (29.4% ) an dPZ-02 F(40.0% ) di dno t mee t th e criteri afo r

dua l colum n confirmation

. Th e dat afo r Aroclo r 124 8 i nsampl e PZ-0 4 (95.8% ) an dfo r Aroclo r 125 4 i nsample s EW

5 (28.6% ) an dMW-2 A (26.7% ) d o no t mee t th e criteri afo r

dua l colum nconfirmation

. Th e result s fo r

Aroclo r 124 8 i nsample s B-18 , B-1 8 DUP , B-4F , B-9 , PZ-02

. PZ-02 Fan dPZ-0 4 ar e considere da s estimate ddu e t o poo r dua l colum nconfirmation

. Th e result s fo r Aroclo r 125 4 i nsample s B-10 , B-9 , MW-4B , EW-5 , MW-2 A an dMW-1B Rar e considere da s estimate ddu e t o th e poo r colum n confirmation

. Summar y A qualit y contro l dat arevie w wa s performe do ngroundwate r sampl e result s analyze dfo r VOCs , SVOC s an dlo w leve l PCBs

. Th e reporte dresult s fo r PCB s i nsom e sample s wer e estimate ddu e t o failur e o f th e colum nconfirmation , likel y du e t o th e observe dweathere dpatter no f th e PCB s detected

. Overall , th e dat acollecte dfo r

thi s projec t

wer e foun dt o b e acceptable

. Base do n thi s review , th e qualifie ddat aar e considere dusabl e fo r

projec t objectives

.

C- 5

### Appendi x D Summar y o f

Wel l Repai r

an dMaintenanc e Activitie s

TD03-00 6 Apri l 2006APPENDI X D Summar yo f Wel l Repair s an d Maintenanc e

Wel l I D

B- 4
B- 9

B-1 0

B-1 8
B-19 R

B-2 8
MW-1 A
MW-1B R
MW-2 A
MW-2 B
MW-3A R
MW-3 B
MW-3I R
MW-4 A
MW-4 B
MW-5 A
MW-5 B
MW-6 A
MW-6 B
MW-7 A
MW-7 B
MW-7 C MW-8 I
MW-9 B

ME- 2 Wel l Repair s

Cu t an d Re-Measur e Casin g Amoun t of PV C rise r remove d [inches ) 1-13/1 6
1

- 7/8
IMC N C
N C N C
3/ 4
N C
N C
N C
2

- 1/ 8
N C
2

- 7/ 8
7/8
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C

N C Amoun t of

PV C rise r remove d (feet ) 0.1 5
0.1 6
N C
N C N C
N C

00 6
N C
N C
N C

0.1 8
N C

0.2 4

0.0 7
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C

N C Replace d

J-Plu g

ye s
ye s
O K
ye s
ye s
ye s
ye s
ye s
ye s
O K
ye s
ye s
ye s
ye s
ye s
O K
ye s
O K
O K
O K
O K
O K
O K
O K

O K Replace d

Cove rBol t

E C
E C
E C
E C
E C
E C
E C
O K
B
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
B
B
O K
O K

O K Comment s

1 o f 2 missin g bolt s wer e replaced ; th e othe rmissin g bol t coul d no t b e replace d becaus e on e se t o f femal e thread s wa s strippe d neithe ro f th e 2 missin g bolt s coul d b e replace d becaus e bot h set s o f femal e thread s wer e broke n of f

differen t styl e cove r- n o bolt s ar e require d t o loc k cove r

wel l i s completel ypave d ove r- canno t local e

neithe ro f th e 2 missin g bolt s coul d b e replace d becaus e bot h set s o f femal e thread s wer e strippe d 1 o f 2 missin g bolt s wer e replaced ; th e othe rmissin g bol t coul d no t b e replace d becaus e on e se t o f femal e thread s wa s strippe d successfull yreplace d 2 o f 2 bolts , bu t bot h sel s o f femal e thread s ar e nearl ystrippe d
piec e o f PV C (unde rroa d bo xcover ) tha t i s abov e th e grou t i s severt y cracke d 1 o f 2 missin g bolt s coul d no t b e replace d becaus e th e femal e thread s d o no t lin e u p wit h th e hole s i n th e cover ; th e othe rmissin g bol t coul d no t b e replace d becaus e th e se t o f femal e thread s wa s broke n off ; PV C casin g ha s a n I D tha t i s les s tha n 2 " NP Ts o pip e coul d no t b e cu t dow n an d J-Dlu q coul d no t b e installe d Notes : 1

. GND = Groun d Surface , TOC = To p o f Casing , EC = Entir e Cover , B = Bolt s Only , NC = No t Cu t

2

. Repairs performe d o n Jun e 23

. 200 5

D- 1APPENDI X O Summar yo f Wel l Repair

s an d Maintenanc e

Wel l I D

ME- 3
ME- 4
ME- 5 ME- 8 ME- 9
ME-1 0 ME-11 A ME-11 B ME-12 A
ME-12 B ME-18 B EW- 4 EW- 5 EW- 8 EW- 9
EW-1 0 EW-1 1
EW-1 6 EW-1 7 EW-1 8 PZ-0 1 PZ-0 2 PZ-0 3 PZ-0 4 Wel l Repair s

Cu l an d Re-Measur e Casin g Amoun t o f PVC rise r remove d finches) N C
N C
N C
1

- 3 M
N C
1

- 1/1 6
N C N C N C

N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C Amoun t o f

PV C rise r remove d (feet ) N C
N C
N C 0.1 5
N C 0.0 9

N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C
N C Replace d

J-Plu g

O K
O K
O K
ye s
O K
ye s
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K Replace d

Cove rBol t

B
E C
B
E C
E C
O K
O K
O K
O K
O K
E C
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K
O K Comment s

n o bolt s require d - missin g pa d loc k

n o bolt s require d - missin g pa d loc k

Notes : 1

. GND = Groun d Surface ,

2

. Repair s performe d o n J ' TOC = To p o f Casing , EC = Entir e Cover , B = Bolt s Only , NC = No t Cu t lun e 23

. 200 5

D- 2il l

KU l

TD03-00 6

Apri l 200 6 Appendi x E Sedimen t an dSurfac e Wate r

Samplin g Result s

## TECHNICA LMEMORANDU M

TO : Projec t

Team FROM : TtEC /

Watermar k
DATE : Marc h15 , 200 6 SUBJECT : Revise dSummar y o f Meado w Broo k

Sedimen t an dSurfac e Wate r

Samplin g Result s a t th e Norwoo dPC B Sit e

O nreques t

o f th e USAGE , followin g th e findin g o f ashee ni na nare ao f

Meado w Broo k

adjacen t t o th e site , asurfac e wate r

sampl e (NW-SW-SH-062305 ) an dsedimen t sampl e (NW-SED-SH-062305 ) wer e collecte do nJun e 23 , 2005

. Th e sample s wer e analyze dfo r nin e targe t

VOCs , fiv e targe t

SVOC s an d PC B Aroclors

. Th e samplin g locatio nwa s approximatel y 7 5 fee t eas t o f ME-11 A alon g Meado w Broo k a s show ni nth e attache dfigure

. Th e surfac e wate r an dsedimen t

samples wer e collecte ddurin g lo w stream-flo w condition s fro ma nisolate dsectio no f standin g wate r

o nth e wester nsid e o f

th e broo k whic h i s floode ddurin g stormevents

. Th e locatio nha dorange/brow n"floe " materia l suspende di nth e wate r an doverlyin g th e sediment

. Als o presen t wa s asligh t

shee no nth e surfac e o f

th e water

. Th e surfac e wate r

sampl e wa s collecte db y directl y dippin g a ninverte dbottl e int o th e wate r an dtiltin g u p t o fill

. Th e surfac e wate r

sampl e di dno t

hav e an y unusua l odors

. Sedimen t fo r SVO C an dPC B analysi s wa s collecte dfro mth e to p si x inche s usin g aclea ndisposabl e HDP Etrowe l an dhomogenize di na stainles s stee l mixin g bowl

. Th e sedimen t sampl e fo r

VOC s wa s collecte ddirectl y usin g acleanHDP E syringe ; approximatel y 5 m l o f sedimen t wa s the ntransferre dint o apre-preserve dvial

. Th e sedimen t collecte dconsiste do f

gre y t o dark

gre y san dan dsmal l sub-angular gravel

. Th e sedimen t

sampl e di dno t hav e an y visibl e stainin g o r unusua l odor

. Result s o f analyse s o f

th e surfac e wate r

an dsedimen t

sample s ar e summarize di nth e attache dtable

. VOC s an dSVOC s wer e detecte di nth e surfac e wate r sampl e an dVOC s wer e als o detecte di nth e sedimen t sample

. PCB Aroclor s wer e not detecte dineithe r

sedimen t or surfac e wate r

sampl e at the metho dreportin g limits

. Th e detectio no f

VOC s i nth e surfac e wate r an dsedimen t

i s consisten t

wit hfinding s o f

previou s quarterl y samplin g round s a t

th e sit e wher e lo w level s o f VOC s wer e detecte da t

th e downstrea msurfac e wate r location , STS- 3 (se e 27 t h

### quarterl y groundwate r monitorin g report

prepare db y Nobis) ; STS- 3 i s locate d adjacen t t o PZ-04

. Th e highe r

concentration s an dth e greate r variet y o f

VOC s an dSVOC s detecte di nth e sample s collecte ddurin g th e curren t samplin g even t

ar e likel y du e t o localize ddepositio ni nth e are a wher e th e shee nwa s noted

. Th e VO C detection s i nth e sediment s ma y b e associate dwit hth e por e wate r i nth e sampl e an dno t

necessaril y fro mcontaminant s adsorbe dt o sedimen t particles

. Th e detectio no f

th e targe t VOC s (chlorobenzene , cis-dichloroethene , an dviny l chloride) , closel y matc h th e VOC s detecte di nth e groundwate r acros s th e Norwoo dsite

. Th e presenc e o f th e tw o targe t

SVOC s (1,3-dichlorobenzen e an d1,4-dichlorobenzene) , i nth e surfac e wate r sampl e i s als o similar

t o th e detection s i nth e groundwate r a t th e site

. Dichlorobenzene s ar e frequentl y associate dwit hPC B oil s an d th e presenc e dichlorobenzene s i s likel y t o enhanc e mobilizatio no f PCB s fro msoi l int o th e groundwater

. However , n o PCB s wer e detecte di nth e surfac e wate r o r sedimen t sample s collecte ddurin g th e curren t samplin g event

.

TD03-00 6 Apri l 200 6Th e presenc e o f th e sheen , th e result s o f

th e sedimen t

an dsurfac e wate r

chemica l analysis , an dth e groundwate r

result s fo r

piezometer s PZ-0 2 an dPZ-0 3 indicat e th e stron g likelihoo dtha t contaminate d groundwate r

i s dischargin g fro mth e sit e int o th e brook

. Th e localize disolate dsectio no f standin g wate r note dabov e likel y act s t o accumulat e contaminant s a s the y discharg e wit hgroundwater

. Thes e contaminant s ar e the nlikel y flushe dou t durin g stor mevent s an dhig hwate r periods

.

TD03-00 6 Apri l 200 6N WEL L SCHEDUL E

Wel lB4B9 B-1 0 B-1 8 B-19 R B-2 8 MW-1 A MW-1B R MW-1 C MW-2 A MW-2 B MW-3A R MW-3 B MW-3I R MW-4 A MW-4 B MW-5 A MW-5 B MW-6 A LMW-6 B J MW-7 A MW-7 B MW-7 C MW-8 I MW-9 BME2ME3ME4ME5ME8ME9 ME-1 0 ME-11 A ME-11 B ME-12 A ME-12 B ME-18 BEW4EW5EW8EW9 EW-1 0 EW-1 1 EW-1 6 EW-1 7 EW-1 8 Screene d

Interva l (deptrf L 5-1 5 7-2 2 5-1 5 9-2 4 5-2 0 5-1 5 5-1 5 20-3 0 66-7 6 4.5-14. 5 33-3 8 4-1 5 69-7 9 33-3 8 7-1 2 37-4 2 4.7-9. 7 92-10 2 7.7-17. 7 88.5-93. 5 8.7

- 1 8 7 33.4-43. 4 80-9 0 56.4-61. 4 28.5-38. 5 17-2 2 25-4 5 24-4 4 5.5-10. 5 12-2 2 69-7 9 5-1 5 15-2 5 11.8-21. 8 10.5-20. 5 6.1-16. 1 23-4 3 8.5-13. 5 13-1 8 30.5-45. 5 31-5 1 21.5-31. 5 21-3 1 19-2 9 19-2 9 31-5 1 Stratu m

Uppe rOverburde n Uppe rOverburde n Uppe rOverburde n Uppe rOverburde n Uppe rOverburde n Uppe rOverburde n Uppe rOverburde n Lowe rOverburde n Lowe rBedroc k Uppe rOverburde n Shallo wBedroc k Uppe rOverburde n Shallo wBedroc k Lowe rOverburde n Uppe rOverburde n Shallo wBedroc k Uppe rOverburde n Shallo wBedroc k Uppe rOverburde n Dee p Bedroc k Uppe rOverburde n Shallo wBedroc k Dee p Bedroc k Lowe rOverburde n Shallo wBedroc k Lowe rOverburde n Shallo wBedroc k Shallo wBedroc k Uppe rOverburde n Shallo wBedroc k Dee p Bedroc k Uppe rOverburde n Shallo wBedrock/Lowe rOverburde n Shallo wBedroc k

/Lowe rOverburde n Shallo wBedrock/Lowe rOverburde n Shallo wBedrock/Lowe rOverburde n Shallo wBedroc k Uppe rOverburde n Uppe rOverburde n Shallo wBedroc k Shallo wBedroc k Lowe rOverburde n Lowe rOverburde n Lowe rOverburde n Lowe rOverburde n Shallo wBedroc k U S Arm yCorp s o f Engineer s N« wEnglan d Distric t

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### Surfac e Wate r Result s (ug/L ) VOC s Summar y o f Surfac e Wate r

an dSedimen t

Result s Norwoo dPC S Superfun dSit e SVOC s PCB s ANALYT E Viny l Chlorid e trans

- 1 ,2-Dichloroethen e 1 ,2-Dichloroethen e (total ) cis- 1 ,2-Dichloroethen e Trichloroethen e 1 , 1 ,2-Trichloroethan e Tetrachloroethen e Chlorobenzen e 1 , 1 ,2,2-Tetrachloroethan e Tota l VOC s NW-SW-SH06230 5 

### 4. 9 1. 1 1 8 1 6 1 U 1 U 

### 1 U 7. 7 1 U 

### 29. 7 ANALYT E

1 ,3-Dichlorobenzen e 1 ,4-Dichlorobenzen e 1 ,2-Dichlorobenzen e 1 ,2,4-Trichlorobenzen e Pentachloropheno l Tota l SVOC s NW-SW-SH06230 5 

### 1 0 1 7 5. 6 U 5. 6 U 1 4 U 2 7 

### ANALYT E

Aroclor-101 6 Aroclor-122 1 Aroclor-123 2 Aroclor-124 2 Aroclor-124 8 Aroclor-125 4

, Aroclor-126 0 Tota l PCB s NW-SW-SH06230 5



### 0.0 5 U 

### 0.0 5 U 

### 0.0 5 U 

### 0.0 5 U 

### 0.0 5 U 0.0 5 U 0.0 5 U 

### 0.0 5

Sedimen t Result s (ug/Kg ) VOC s SVOC s PCB s ANALYT E Viny l Chlorid e trans

- 1 ,2-Dichloroethen e 1 ,2-Dichloroethen e (total ) cis

- 1 ,2-Dichloroethen e Trichloroethen e 1 , 1 ,2-Trichloroethan e Tetrachloroethen e Chlorobenzen e 1 , 1 ,2.2-Tetrachloroethan e Tota l VOC s NW-SED-SH06230 5 

### 3. 8 U 3. 8 U 9. 4 9 

### 3. 8 U 3. 8 U 3. 8 U 1 1 3. 8 U 2 0 

### ANALYT E

1 ,3-Dichlorobenzen e 1 ,4-Dichlorobenzen e 1 ,2-Dichlorobenzen e 1 ,2,4-Trichlorobenzen e Pentac h1 oropheno l Tota l SVOC s NW-SED-SH06230 5 

### 43 0 U 43 0 U 43 0 U 43 0 U 220 0 U <43 0 ANALYT E

Aroclor-101 6 Aroclor-122 1 Aroclor-123 2 Aroclor-124 2 Aroclor-124 8 Aroclor-125 4 Aroclor-126 0 Tota l PCB s NW-SED-SH06230 5

2 2 U 

### 2 2 U 2 2 U 2 2 U 2 2 U 2 2 U 2 2 U <2 2



### Notes : U = no t detecte da t

th e specifie dreportin g limi t Sample s collecte do n Jun e 23 , 200 5

TD03-00 6 Apri l 200 6