Sl.H . Z . R K H \K : OTHhR : 

# Five-Yea r Revie w Report
SecondFive-Yea

r Revie w Repor

t fo r Th e Tow n Garage/Radi o Beaco n Superfun dSit e

Tow n o f Londonderr

y Rockingha mCounty , Ne w Hampshir e


### Marc h200 4 Prepare dby : Th e Unite dState s Environmenta l Protectio n Agenc y

Regio n 1 , Ne w Englan d Boston , Massachusett s 

# A 

# EPA

Ne w Englan d
Approve dby : Date : Susan Studlien , Directo r Offic e o f Sit e Remediatio n an dRestoratio n U.S . EPA , Ne w Englan d 

### n?.

SDM S DocI D 00020149 9Tabl e o f Content s Fiv e Yea r Revie w Summar y Form I . Introductio n 1 II . Sit e Chronolog y 2 III . Backgroun d2

A . Physica l Characteristic s 2 B . Lan dan dResourc e Us e 2 C . Histor y o f

Contaminatio n 3 D . Basi s fo r

Takin g Actio n 3 IV . Remedia l Action s 3

A . Remed y Selectio n 3 B. Remed y Implementatio n 3 C . Syste mOperations/Operatio n an dMaintenanc e (O&M ) 4 V . Progres s Sinc e th e Las t Five-Year

Revie w 4 VI . Five-Year

Revie w Proces s 5 A . Administrativ e Component s 5 B . Communit y Involvemen t 5 C . Documen t

Revie w 5 D . Dat aRevie w 5 E . Sit e Inspectio n 6 F . Interview s 6 VII . Technica l Assessmen t 6 A . I s th e remed y functionin g a s intende db y th e decisio n documents ? 6 B . Ar e th e exposur e assumptions , toxicit y data , cleanu p levels , an dremedia l actio n objective s use dat

th e tim e o f

remed y selectio n stil l valid ? 6 C . Ha s an y othe r

informatio n com e t o ligh t tha t coul dcal l int o questio n th e protectivenes s o f

th e remedy ? 7 VIII . Issue s 8 IX . Recommendation s an dFollow-u p Action s 8 X . Protectivenes s Statemen t 9 XI . Nex t

Revie w 9Attachmen t A Document s Reviewe d Figure s Attachmen t

B Figur e 1 - Sit

e Ma p Figure s 2 throug h 1 4 - Concentratio n vs . Tim e Plot s Table s Tabl e 1 - Chronolog y o f

Site Event s Pag e 2 Tabl e 2 - RO D Groun dWate r Cleanu p Goal s an dResult s Pag e 4

### Five-Yea r ReviewSummar y For m SIT E IDENTIFICATIO N Sit e name : Tow n Garage/Radi o Beaco n EP A ID : NHD98106386 0 Region : 1 State : Ne w Hampshir e City/County : Londonderry/Rockingha m SIT E STATU S NP L status : /Fina l D Delete d D Othe r(specify) . Remediatio n statu s (choos e al l tha t apply) : D Unde rConstructio n D Operatin g / Complet e Multipl e OUs? * DYE S /N O Constructio n completio n date : Septembe r30,199 2 Ha s sit e bee n pu t int

o reuse ? /

YE S D N O REVIE W STATU S Lea d agency : /

EP A D Stat e D Trib e D Othe rFedera l Agenc y Autho r name : Jame s DiLorenz o Autho r title : Remedia l Projec t Manage r Autho r affiliation : U.S . EPA , Regio n 1 Revie wperiod : Februar y6 , 2004 , throug h March , 200 4 Date(s ) o f sit e inspection : Februar y27 , 200 4 Typ e o f review : / Post-SAR A D Pre-SAR A D NPL-Remova l onl y D Non-NP L Remedia l Actio n Sit e D NP L State/Tribe-lea d D Regiona l Discretio n Reviewnumber : D 1 (first ) / 2 (second ) D 3 (third ) D Othe r(specify) Triggerin g action : D Actua l R A Onsit e Constructio n a t O U #

_ D Constructio n Completio n D Othe r(specify ) D Actua l R A Star t a t OU # / Previou s Five-Yea rRevie w Repor t Triggerin g actio n date; : Marc h 31 , 199 9 Du e date : Marc h 31,200 4

### Five-Yea r Revie wSummary Form , cont'd .

Issues : N o issue s wer e identifie ddurin g thi s review . Recommendation s an d Follow-u p Actions : Londonderry' s consultan t

wil l continu e t o sampl e residentia l an dmonitorin g wells . I f th e result s o f samplin g indicat e tha t

additiona l remedial action s ar e needed , option s wil l b e evaluate dan dimplemente dwhic h woul dprotec t th e publi c health . Londonderry' s consultan t

wil l sampl e surfac e water s afte r al l monitorin g well s hav e achieve dcleanu p levels . Th e Groundwate r

Managemen t

Permi t wil l remai n in-plac e unti l al l monitorin g well s hav e achieve dcleanu p levels . Protectivenes s Statement : Becaus e th e remedial action s bein g implemente dthroughou t th e Tow n Garage/Radi o Beaco n Superfun dSit e ar e protective , th e sit e i s protectiv e o f huma n healt h an dth e environment .Tow n Garage/Radi o Beaco n Superfun d Sit e Secon d Five-Yea rRevie w Repor t I . Introductio n Th e purpos e o f

afive-year

revie w i s t o determin e whethe r aremed y at

aSuperfun dsit e i s protectiv e o f

huma n health an dth e environment . Th e methods , finding s an dconclusion s o f review s i s documente di n five-year revie w reports . I n addition , five-year revie w report s identif

y issue s foun ddurin g th e review , i f any , an drecommendation s t o addres s them . Th e U.S . Environmenta l Protectio n Agenc y (EPA ) Ne w Englan dmus t implemen t

five-year review s consistent

with th e Comprehensiv e Environmental Response , Compensation , an d Liabilit y Ac t

(CERCLA ) an dth e Nationa l Oi l an dHazardou s Substance s Pollutio n Contingenc y Pla n (NCP) . CERCL A Sectio n 121(c ) states :

If the President

selects a remedial

action that

results in any hazardous substances, pollutants, or contaminants remaining at the site, the President

shall review such remedial

action no less often than each

five years after

the initiation of

such remedial action to assure that

human health and

the environment

are being protected by the remedial

action being implemented. EP A interprete dthi s requiremen t furthe r i n th e NCP ; 4 0 CF R§300.430(f)(4)(ii ) states : If a remedial

action is selected

that results in hazardous substances, pollutants, or contaminants remaining at the site above levels that allow for unlimited

use and unrestricted

exposure, the lead agency shall

review such action no less often than every five years after

initiation of

the selected

remedial action. EP A conducte dthi s secon dfive-year revie w o f

th e remedia l action s implemente dat th e Town Garage/Radi o Beaco n Superfun dSite , i n Londonderry , Ne w Hampshire . Thi s i s apolic y revie w sinc e upo n completio n of

the remedia l actio n no hazardou s substance s wil l remai n abov e level s tha t allo w fo r unlimite dus e an dunrestricte dexposure , bu t fiv e o r mor e year s ar e require dt o reac h that point . Th e revie w wa s conducte dfro mFebruar y throug h March , 2004 . Thi s repor t document s th e result s o f

th e review . Th e trigger

fo r thi s revie w i s th e signatur e dat e o f th e initia l five-yea r review , Marc h 31 , 1999 .Tow n Garage/Radi o Beaco n Superfun d Sit e

Secon d Five-Yea rReview , Marc h 2004 Pag e 2 II . Site Chronology Tabl e 1 list s th e chronolog y o f event s fo r

th e Tow n Garage/Radi o Beaco n Superfun dSite . Tabl e 1 : Chronolog y o f

Sit e Event s Dat e 198 4 198 8 - 198 9 Marc h 3 1,198 9 Septembe r 30 , 199 2 Septembe r

30 , 199 2 Septembe r 30 , 199 6 Augus t 199 7 Marc h 3 1, 1 99 9 Even t

Discover y o f

th e proble m Provisio n o f

publi c water Fina l listin g o n NP L RI/F S complete d RO D signatur e Unilateral Orde

r issue dto tow n o f

Londonderr

y to performgroun d wate r monitorin g Issuanc e o f

Groundwate r

Managemen t

Permi t t o tow n o f Londonderr y Firs t five-year revie w report III . Backgroun d A . Physical Characteristic s Th e Tow n Garage/Radi o Beaco n Superfun dSit e i s locate dnort h o f Pillsbur y Roadnea

r th e intersectio n o f

Pillsbur y an dHig h Rang e Road s i n Londonderry , Ne w Hampshire . Muc h o f th e are ai s woode dwit h awetlan dlocate dbetwee n residentia l developments . Se e Figur e 1 . B . Lan d an d Resourc e Us e Th e site encompasse s tw o residentia l developments : twenty-thre e home s o n Holto n Circl e an dthirtee n home s o n Saddlebac k Road ; awetlan darea ; an dth e Londonderr y tow n garag e are alocate do n Hig h Rang e Road . Al l home s i n th e Saddleback Roadsubdivisio n are attache dt o apubli c wate r supply . Several home s i n th e Holto n Circl e subdivisio n remai n o n privat e well s sinc e the y hav e a lon g histor y o f

remainin g unaffecte db y th e groundwate r contamination .Tow n Garage/Radi o Beaco n Superfun d Sit e

Secon d Five-Yea rReview . Marc h 200 4 Pag e 3 C . Histor y o f

Contaminatio n Th e sit e wa s discovere di n 198 4 followin g areques t t o th e State b y resident s o f th e Holto n Circl e subdivisio n t o sampl e thei r bedroc k wells . Samplin g result s fro mth e Ne w Hampshir e Departmen t

o f Environmenta l Service s (NHDES ) reveale dth e presenc e o f volatil e organi c compound s (VOCs ) i n severa l o f th e residentia l drinkin g wate r well s an d th e nearb y tow n garag e well . Th e Sit e wa s adde dt o th e Nationa l Prioritie s Lis t (NPL ) o n Marc h31,1989 . D . Basi s fo rTakin g Actio n Th e majo r contaminant s detecte di n groun dwate r include d1, 1 dichloroethen e (1,1-DCE) ; 1, 1 dichloroethan e (1,1-DCA) ; an d1,1, 1 trichloroethan e (1,1,1-TCA ) at level s abov e federa l an dstate primary drinkin g water standards . Four

non-sit e relate dmetals : barium , beryllium , chromiu man dantimon y wer e als o discovere dat concentration s i n exces s o f drinkin g wate r

standards . IV . Remedia l Action s A . Remed y Selectio n Th e remedia l actio n objective s identifie di n th e Recor do f Decisio n (ROD ) issue d Septembe r 30 , 1992 , are : "S " Preven t

ingestio n o f

wate r whic hcontain s compound s i n concentration s tha t excee dfedera l an dstat e enforceabl e drinkin g wate r standards ; an d "S " Preven t

ingestio n o f

wate r containin g compound s whic hhav e n o enforceabl e federal o r state drinkin g wate r

standard s bu t

whic hpos e a n unacceptabl e health risk. Th e RO D identifie dnatura l attenuatio n wit hmonitorin g fo r remediatio n o f

sit e groun d wate r andinstitutiona l control s to preven t consumptio n of

contaminate dgroun dwate r unti l groun dwate r

cleanu p level s wer e attained . Wit hregardt o metals , th e RO D conclude dtha t

elevate dconcentration s were probabl y du e t o samplin g artifact s an dno t representativ e o f

actua l conditions . Re-samplin g o f groundwate r

b y an improve dmetho d (low-flow ) wa s require dt o verif y actua l conditions . B . Remed y Implementatio n Groundwate r

monitorin g wa s performe db y th e Ne w Hampshir e Departmen t o f Environmenta l Service s (NH DES ) unti l aUnilatera l Administrativ e Order wa s issue dt o th e Town o f

Londonderr y o n Septembe r 30 , 1996 . Th e Tow n wa s th e onl y potentially responsibl e part y identifie dfo r th e Site . Th e Town implemente drequire dinstitutiona l control s an dhire daconsultan t t o perfor mcontinue dgroundwate r monitoring .Tow n Garage/Radi o Beaco n Superfun d Sit e

Secon d Five-Yea rReview , Marc h 200 4 Pag e 4 C . Syste m Operations/Operatio n an d Maintenanc e (O&M ) Currently , th e remed y remain s monitore dnatura l attenuatio n an dth e groun dwate r i s sample donc e ayea

r in the lat e fall . Groun dwate r monitorin g dat aindicate s tha t the cleanu p o f

th e groun dwate r

i s progressin g a s anticipated . Th e RO D cleanu p goal s fo r groun dwater , develope di n respons e t o th e remedia l actio n objectives , alon g wit h th e maximu mlevel s o f

contaminant s foun di n monitorin g well s sinc e th e las t five-year revie w ar e presente di n Tabl e 2 , below . Se e Figur e 1 fo r th e locatio n o f

th e monitorin g wells . Barium , beryllium , chromiu man dantimon y wer e re-sample dusin g th e low-flo w samplin g method . Result s confirme dthat actual concentration s di dno t excee ddrinkin g wate r standards . Thre e round s o f subsequen t

monitorin g wer e performe dwhic h verifie d thi s result . Metal s wer e remove dfro mth e monitorin g program .

Tabl e 2 : RO D Groun d Wate rCleanu p Goal s an d Result s Contaminan t 1,1, 1 -Trichloroethan e 1,1-Dichloroethen e 1,1-Dichloroethan e Targe t

Level (jig/1 ) 20 0 7 8 1 1999-200 2 Maximum/

Well No . 8 5 ng/l/MW-2D- 6 4 8 ug/l/MW-2D- 6 12 0 ug/l/MW-2D- 6 200 3 Maximum/ Well No . 1 9 ug/l/MW-2D- 6 2 8 ug/l/MW-2D- 6 5 7 ng/l/MW-2D- 6 Maintenanc e primaril y involve s ensurin g the integrit y of the monitorin g network

so tha t representativ e sample s ca n b e obtained . A writte n agreemen t betwee n Stonemark Investments , Inc. , th e developer o f Saddlebac k

Roa dan dth e Tow n o f

Londonderry , date d Decembe r 11 , 1996 , include s provision s fo r long-termacces s to , an dmaintenanc e of , monitorin g wells . Duron g th e constructiono f th e Saddlebac k

Roa dsubdivision , MW-2 S wa s destroye dan dMW-2 D damaged , bu t Stonemar k Investments , Inc . implemente dth e necessar y repair s consisten t

wit h th e abov e agreement . V . Progres s Sinc e th e Las tFive-Yea rRevie w Th e las t five-year revie w containe dfou r

recommendation s fo r

ensurin g th e protectivenes s o f th e remedy . Th e statu s o f thei r implementatio n i s presente dbelow : (1 ) Th e current

annual groundwater

monitoring program should continue Th e annua l groun dwate r

progra mha s continue dan di s documente di n annua l report s provide dt o EP A an dNHDES .Tow n Garage/Radi o Beaco n Superfun d Sit e

Secon d Five-Yea rReview , Marc h 200 4 Pag e S (2 ) Monitoring wells MW-2S an d MW-2D are critical

monitoring locations and should be replaced

and/or repaired, as necessary, to effectively monitor continued

progress towards achievement of remedial objectives Bothwell s wer e addresse ds o tha t n o dat awa s missed . Repair s wer e mad e t o MW-2 D an dMW-2 S wa s replace do n Novembe r 18 , 1999 , prio r

t o th e annua l samplin g event . (3 ) Th e Groundwater

Management

Permit should b e maintained

to ensure that potable wells are not

installed within the plume area Th e permi t

duratio n i s fiv e year s an dwa s renewe di n Augus t 2002 . N o evidenc e wa s foun do f an y ne w drinkin g wate r

well s havin g bee n installed . (4 ) Surface water

i n th e wetland

area directly downgradient o f th e plume should be sampled

once drinking water

standards are achieved

to ensure compliance with CWA <f> 304(a) Thi s recommendatio n i s stil l valid , sinc e drinkin g wate r standard s hav e no t

bee n me t i n al l wells . VI . Five-Yea rRevie w Proces s A . Administrativ e Component s Th e Tow n Garage/Radi o Beaco n Superfun dSit e five-yea r revie w wa s conducte db y Roger Duwart , wit hassistanc e fro mJame s DiLorenzo , th e EP A Remedia l Projec t Manager , an dAndre w Hoffman , th e NHDE S Remedia l Projec t Manager . B . Communit y Involvemen t Copie s o f th e revie w ar e bein g place di n th e informatio n repositories , includin g th e Leac h Publi c Librar y i n Londonderry , Ne w Hampshire . A cop y i s bein g provide dt o th e Tow n Manager . C . Documen tRevie w Thi s five-yea r

revie w consiste do f

arevie w o f

relevan t document s includin g Applicabl e an dRelevan t

o r Appropriat e Requirement s (ARARs) , th e Groundwate r Managemen t Permit , an dmonitorin g dat aprovide db y th e tow n o f Londonderry' s consultant . Th e samplin g document s reviewe dar e presente di n Attachmen t A . D . Dat aRevie w Revie w o f

record s an dmonitorin g report s throug h Novembe r o f 2003 , indicate s tha t

th e remed y i s performin g a s expected .Tow n Garage/Radi o Beaco n Superfun d Sit e

Secon d Five-Yea rReview , Marc h 200 4 Pag e 6 Fo r th e site , si x groun dwate r

Chemical s o f

Concer n wer e identifie dan dha dcleanu p level s set. I n th e lates t

groun dwate r

samplin g roun d(November , 2003) , te n complianc e well s an dthre e residentia l well s wer e sampled . Onl y on e Chemica l o f Concern , 1,1 - dichloroethene , wa s foun di n onl y on e well , MW-2D 1 , abov e it s cleanu p level . Historica l trend s fo r several monitorin g well s ar e presente di n Attachmen t B . E . Sit e Inspectio n Representative s o f

EP A an dNHDES , participate di n th e sit e inspectio n hel do n February 27 , 2004 . Durin g th e inspection , th e residentia l development , tow n garag e are a an dth e groun dwate r

monitorin g well s wer e observed . N o potabl e well s wer e observed . F . Interview s Th e attorne y representin g th e Town wa s contacte dfo r a n interview . N o concern s wer e raised . VII . Technica l Assessmen t A . I s th e remed y functionin g a s intende d b y th e decisio n documents ? Th e RO D estimate dtha t

th e groun dwate r

woul dachiev e cleanu p level s throug hnatura l attenuatio n withi n seven t o twenty-fiv e years . Eleve n year s hav e passe dan dal l bu t on e Chemica l o f

Concer n i n al l bu t

on e fractur e zon e fro mon e bedroc k wel l ha s achieve d cleanu p levels . Moreover , adownwar dtren di s eviden t i n tha t fractur e zon e (se e Figur e 4) . Therefore , i t woul dappear

tha t th e remed y i s functionin g a s intended . B . Ar e th e exposur e assumptions , toxicit y data , cleanu p levels , an d remedia l actio n objective s use d a tth e tim e o f remed y selectio n stil l valid ? Ther e hav e bee n significan t change s i n lan dus e o n th e site . However , th e residentia l developmen t

whic hha s occurre do n th e sit e i s serve db y publi c wate r an dn o additiona l drinkin g wate r

well s hav e bee n installed . Unde r the 198 6 cance r

guideline s (U.S . EPA , 1986) , 1,1-DC E (aChemica l of Concer n fo r th e site ) wa s assigne dt o Grou p C , apossibl e huma n carcinogen . However , unde r th e draf t revise dguideline s fo r

carcinogeni c ris k

assessmen t

(U.S . EPA , 1999) , EP A ha s conclude dtha t

th e dat afo r

1,1-DC E ar e inadequate fo r a n assessmen t

o f huma n
'Thi s i s abedroc k

wel l wit hpermanentl y installe dpacke r device s whic hextrac t

sample s fro mdiscret e fractur e zones . Si x suc hzone s exis t i n thi s well . Onl y th e deepes t fractur e zone , MW-2D- 6 ha s 1,1-dichloroethen e presen t abov e it s cleanu p level .Tow n Garage/Radi o Beaco n Superfun d Sit e

Secon d Five-Yea rReview , Marc h 200 4 Pag e 7 carcinogeni c potentia l b y th e oral route . Therefore , aquantitativ e estimat e o f carcinogeni c ris k

fro moral exposur e canno t b e calculated . Th e federa l an dstat e drinkin g wate r standard s remai n at

7 ng/1 , however . N o other change s hav e occurre di n toxicity assumption s fo r site-relate dChemical s o f Concern . Th e followin g applicabl e o r relevan t an dappropriat e requirement s (ARARs ) wer e reviewe dfo r

change s tha t

coul daffec t

protectiveness : Saf e Drinkin g Wate r

Ac t (4 0 CF RPart

141 ) Resourc e Conservatio n an dRecover y Ac t (4 0 CFR264 ) Clean Wate r

Ac t (4 0 CF R122 ) Ne w Hampshir e Cod e o f

Administrativ e Rule s Env-W m140 3 (formerl y Env-W s 410 ) N o ARAR s o r

"T o B e Considered " criteri awer e change dwhic hwoul daffec t th e protectivenes s o f

th e remedy . Thus , th e remed y i s protectiv e an di n complianc e wit h thes e ARARs . C . Ha s an y othe rinformatio n com e t o ligh ttha tcoul d cal l int o questio n th e protectivenes s o f

th e remedy ? N o othe r informatio n ha s com e t o ligh t whic hwoul dcal l int o questio n th e protectivenes s o f th e remedy . Technica l Assessmen tSummar y Th e followin g conclusion s suppor t th e determinatio n that

th e remedy fo r

th e Tow n Garage/Radi o Beaco n Superfun dSit e remain s protectiv e o f huma n healthan dth e environment . * * Residentia l developmen t ha s occurre do n th e site . However , publi c wate r i s provide dan dtherefor e th e remed y remain s protective . * * A Groundwate r

Managemen t

Permi t remain s i n effec t

t o ensur e that

n o ne w drinkin g wate r

well s ar e installe dwithi n th e sit e boundaries . * * N o ne w contaminants , source s or exposure pathway s were identifie d durin g thi s five-year

review . * * Th e groun dwate r

flo w pattern s ar e consisten t wit hth e expectation s at th e tim e o f

th e decisio n documents .Tow n Garage/Radi o Beaco n Superfun d Sit e

Secon d Five-Yea rReview , Marc h 200 4 Page S

<* * A groun dwate r

monitorin g pla n i s i n place , sufficien t t o identif y potentia l futur e problem s an dt o provid e informatio n t o addres s them , i f necessary . <* * Th e remedy i s performin g a s expecte dan dthere are n o indication s o f a potentia l failure . VIII . Issue s N o issue s wer e identifie ddurin g thi s review . IX . Recommendation s an d Follow-u p Action s The consultan t

for the tow n of

Londonderry wil l continu e to sampl e residentia l and monitorin g wells . I f

th e result s o f

samplin g indicat e tha t

additiona l remedial action s ar e needed , option s wil l b e e \aluate dan dimplemente dwhic hwoul dprotec t th e publi c health . Th e consultan t

fo r th e tow n o f

Londonderry wil l sampl e surfac e water s afte r al l monitorin g well s hav e achieve dcleanu p levels . Th e Groundwate r

Managemen t

Permi t wil l remai n in-plac e unti l al l monitorin g well s hav e achieve dcleanu p levels .

Recommendations / Follow-u p Action s
Monito r groun dwate r

annuall y Monito r surfac e wate r Maintai n institutiona l control s throug hGroundwate r Managemen t

Permi t Part y

Responsibl e
Londonderr y Londonderr y Londonderry Oversigh t

Agenc y
EPA/NHDE S EPA/NHDE S EPA/NHDE S Mileston e Dat e

Lat e fal l eac hyear Whe n al l groun d water cleanup level s hav e bee n achieve d Unti l al l groun d wate r cleanu p level s hav e bee n achieve d Follow-u p Actions : Affect s Protectivenes s (Y/N ) Curren t N N N Futur e

N N NTow n Garage/Radi o Beacon Superfun d Site

Secon d Five-Yea rReview , Marc h 2004 Pag e 9 X . Protectivenes s Statemen t Becaus e th e remedia l action s bein g implemente dthroughou t th e Tow n Garage/Radi o Beaco n Superfun dSite are protective , th e site i s protectiv e o f huma n healt

h an dth e environment . XI . Nex tRevie w Thi s site require s polic y review s ever y fiv e year s sinc e upo n completio n o f th e remedial actio n n o hazardou s substance s wil l remai n abov e level s tha t allo w fo r unlimite dus e an d unrestricte dexposure , bu t fiv e o r mor e year s ar e require dt o reac h tha t point . Th e nex t revie w wil l b e issue deithe r o n o r prio r t o fiv e year s fro mth e dat e o f signature o f

thi s report .ATTACHMEN T A DOCUMENT S REVIEWE D "Groundwate r

Managemen t

Permit, " Ne w Hampshir e Departmen t o f Environmenta l Services , August , 1997 . "Annual Report , 199 9 Groundwate r Monitorin g Program , Tow n Garage/Radi o Beaco n Site , Londonderry , Ne w Hampshire, " Sanbom , Hea d& Associates , Inc. , Januar y 2000 . "Annual Report , 200 0 Groundwate r Monitorin g Program , Tow n Garage/Radi o Beaco n Site , Londonderry , Ne w Hampshire, " Sanborn , Hea d& Associates , Inc. , Januar y 2001 . "Annual Report , 200 1 Groundwate r Monitorin g Program , Tow n Garage/Radi o Beaco n Site , Londonderry , Ne w Hampshire, " Sanborn , Hea d& Associates, Inc. , Januar y 2002 . "Annual Report , 200 2 Groundwate r Monitorin g Program , Tow n Garage/Radi o Beaco n Site , Londonderry , Ne w Hampshire, " Sanborn , Hea d& Associates , Inc. , Januar y 2003 . "Annua l Report , 200 3 Groundwate r Monitorin g Program , Tow n Garage/Radi o Beaco n Site , Londonderry , Ne w Hampshire, " Sanborn , Hea d& Associates , Inc. , Januar y 2004 .ATTACHMEN T B FIGURE SLAYOUT : FIGUR E CT B FIL E SH A STANDARO.CT B PLO T DAT E 1-27-0 4 

# • • I Ol\BACKUP\1207.1\dw9\NEWl.J> 9 O 200 4 SANBORN , HEAD * ASSOCIATES , I

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## TOW NGARAGE/RADI O BEACO NSIT E LONDONDERRY , NE W HAMPSHIR E 

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