SFUN D RECORD S CT R 

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# OLF R LEVINE-FRICK E October 22 , 200 2 001-01954-02-00 1

Ms . Holl y Hadloc k Unite dState s Environmenta l Protectio n Agenc y 7 5 Hawthorn e Stree t Sa n Francisco , Californi a94105 Subject : Wor k

Pla n t o Implemen t

Monitore dNatura l Attenuatio n a s aRemedia l Measur e a t th e Forme r

Sol aOptica l U.S.A . Facility , 150 0 Cade r Lane , Petaluma , Californi a Dea r Ms . Hadlock : LF RLevine-Frick e (LFR ) ha s prepare dthi s wor k pla n at th e reques t

o f th e Unite dState s Environmenta l Protectio n Agenc y (EPA ) o n behal f o f America n Optical, Sola , fo r th e implementatio n o f

Monitore dNatura l Attenuatio n (MNA ) a s aremed y fo r volatil e organi c compound s (VOCs ) i n groundwate r at th e forme r

Sol aOptical U.S.A . facility locate dat 150 0 Cade r Lan e i n Petaluma , Californi a("th e Site") . Thi s wor k

pla n present s agroundwate r monitorin g progra mfo r assessin g natura l attenuatio n o f th e VOC s 1,1-dichloroethen e (1,1-DCE ) an d1,1-dichloroethan e (1,1-DCA ) i n groundwate r a t th e Site . Th e progra minclude s selecte dwell s t o b e sampled , frequenc y o f an drational e fo r

sampling , well s t o b e destroye dan drational e fo r destruction , confirmatio n sampling , an dexi t strateg y fo r

th e program . Propose d Groundwate r Monitorin g Progra m LF Rpropose s th e followin g groundwate r monitorin g progra mfo r th e Site : semiannual samplin g o f monitorin g well s W-27 , E-3 , an dE- 5 an dannua l samplin g o f monitorin g well s W-22 , W-25 , LF-2 , an dE- 7 (Figur e 1) . Well s W-27 , E-3 , an dE- 5 wer e selecte dfo r semiannua l monitorin g becaus e the y ar e locate dwithi n th e plum e an drepresen t groundwate r

wit h th e highes t

concentration s o f VOC s at th e Site . Well s W-22 , W-25 , LF-2 , an dE- 7 are locate ddowngradien t fro mth e plum e an dwer e selectedfo r annua l monitorin g fo r

us e a s sentr y wells . Concentration s o f VOC s i n thes e well s hav e bee n belo w maximu mcontaminan t

level s (MCLs ) fo r

a t leas t th e las t fiv e year s (i.e. , sinc e 1997 o r before) . Groundwate r

monitorin g wil l consis t o f purgin g eac h wel l o f

fro mthre e t o fiv e wel l casin g volume s usin g eithe r

aTeflo n baile r

( ane w disposabl e baile r wil l b e use dfo r

eac h well ) o r

acentrifuga l pump . Wel l samplin g equipmen t wil l b e cleane dwit h high-pressur e ho t wate r (steam-cleaned ) befor e samplin g o f

eac h well . Well s wil l b e purge dunti l fiel dparameter s o f pH , temperature , an d specifi c conductanc e hav e stabilize dt o withi n 1 0 percen t o f th e previou s reading .

1900 Powell Street, 12th

Floor, Emeryville, California 94608-1827

• (510) 652-4500

• fax (510) 652-2246

• www.lfr.com Offices Worldwide

# f»ILF R

Groundwate r

sample s wil l the n b e collecte dfro mth e wel l usin g adisposabl e Teflo n baile r an d decante dfro mth e baile r int o laboratory-supplie dcontainer s preserve dwit h hydrochlori c acid . Eac h sampl e container

wil l the n b e seale dwit h achain-of-custody seal , labele dan dstore di n achille dic e ches t fo r transportatio n t o Curti s & Tompkins , Ltd. , Analytica l Laboratorie s ("C&T") , astate certifie dlaboratory locate di n Berkeley , California , unde r stric t chain-of-custod y protocol . Sample s wil l b e analyze dfo r

VOC s usin g EP A Metho d8260B (usin g an 801 0 list) . T o provid e qualit y assuranc e an dqualit y contro l (QA/QC ) data, on e fiel dblan k (equipmen t

rinsat e blank ) an don e duplicat e sampl e wil l b e collecte dpe r samplin g event . Groundwate r Monitorin g Wel l Destructio n LF Rpropose s t o destro y th e followin g groundwate r monitorin g wells : W-14 , LF-25 , LF-26 , E-6 , E-10 , an dE- l 1 (Figur e 1) . Concentration s o f VOC s i n thes e well s hav e bee n belo w MCL s fo r 2 t o 1 1 years . Well s W-1 4 an dE-1 0 ar e locate dwithi n 1 5 fee t o f wel l E-l , whic h i s bein g retaine da s a contingenc y well . Onl y on e wel l i s neede dt o quantif y groundwate r

i n that area , an dwel l E- l can doubl e a s bot

h amonitorin g an dacontingenc y wel l i f needed . Wel l E- l 1 i s locate dwithi n 1 0 fee t o f wel l LF- 2 an di s no t

neededto characteriz e th e plume . Well s LF-2 5 an dLF-2 6 wer e initiall y use da s downgradien t

sentry well s at

th e southern boundar y o f th e property . Give n th e exten t an d curren t VO C concentration s i n groundwate r at th e Site , th e downgradien t exten t o f VOC-affecte d groundwate r

can b e monitore dusin g well s W-2 2 an dLF-2 . Wel l E- 6 i s locate dwithi n 2 5 fee t o f wel l W-2 5 an di s no t

neede da s amonitorin g wel l o r contingenc y wel l becaus e VO C concentration s i n thi s wel l hav e bee n at o r belo w MCL s fo r

at leas t 7 years . Each o f th e well s propose dfo r

destructio n wil l b e sample donc e prio r to destructio n to verif

y that concentration s o f

VOC s ar e stil l belo w MCLs . Contingenc y Well s Well s E-l , E-2 , an dE- 4 ar e t o b e retaine da s contingenc y wells . Confirmatio n Samplin g Groundwate r

monitorin g wil l continu e at th e Site o n asemiannua l basi s unti l sampl e analytica l result s indicat e tha t

VO C concentration s i n groundwate r hav e bee n at

o r belo w MCL s i n al l well s fo r aperio do f

2 years . A t

tha t tim e LF Rwil l submi t

areques t t o sto p monitorin g an dprepar e a lette r t o th e EP A requestin g cas e closur e fo r th e Site . Thi s lette r

wil l includ e areques t

fo r destructio n o f

al l monitorin g well s o n th e curren t monitorin g programan dal l remainin g contingenc y wells .

wp-sola-mna-oct02-01954 : vc h

# 1SILF R

Pleas e cal l m e wit h an y question s o r comment s at

(510 ) 652-4500 . Sincerely ,

Larry L/puyad e Senior Projec t Hydrogedlogis t Enclosure : Figur e 1

wp-sola-mna-oct02-01954 : vc hI



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•6 ft C A D E R LANE 

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, |LF-26 | LF-25 | 4—GROUNDWATE R TREATMEN T SYSTE M

INDUSTRIAL WASTEWATE R PRETREATMEN T SYSTE M 

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• EXPLANATIO N Shallo w (u p t o approx . 3 0 feet ) monitorin g wel l Intermediat e (u p t o approx . 6 0 feet ) monitoring wel l Forme rextractio n wel l Fenc e lin e Well s retaine d a s par

t o f propose d monitorin g progra m (7 ) Contingenc y well s (3 ) Wel l Propose d fo rdestructio n (6 ) Outlin e o f shallo w groundwate rwit h concentration s o f 1,1-DC E tha t exceede d th e maximu m contaminan t leve l o f 6 microgram s pe rlite r(9/9 9 & 3/0 0 data ) 1,1-DC E 1,1-Dichloroethen e

6 0 12 0 FEE T



### Propose d Groundwate r Monitorin g Progra m

Sol a Optica l U.S.A. , Petaluma , Californi a 

# @LF R LEVINE'FRICK E Figure 1