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_ ENVIRO NIENTA1L HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNT' (�narsreprrvacuac <br /> �r 1-1 1.� iloranr Hcr3n,R £lI 304 East Webcr Avenue,Third Fioor Carl Borgrnsn R E f[ S r <br /> 7g { <br /> Di,eam %hk, Hugg%ns,R E rl S R t)I <br /> Al015en.it E H 5 Stockton, California 95202-27OR <br /> _ Douglas W 'Wilson,R E 1­15 <br /> hf:ai=le"i Telephone (209) 468-3420 Margaret La-c-no, R E Fl S i <br /> 1 t`Fa1=' Laurie A Cotulln,R.E fI SFax (209) 464-0139 Robert ryk.Clellon R i H S <br /> Pingrant Min ager :/dark Barccllus R E H S <br /> r <br /> BOB HOPRINg <br /> DEC 3 0 2003 <br /> IION-OIL COYTPPINY - <br /> 276 TANK FARM ROAD <br /> P Q BOX 1069 <br /> SAN LUIS OBISPO CA 93406 <br /> RE Former Unocal#2859 SITE CODE' 1213 <br /> '1,865 Pacific Avenue <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the"Evaluation of <br /> 1,2-Dichloroethane to Groundwater and Proposed Changes to the Monitoring and Sampling <br /> Program" dated November 26, 2003, prepared by ENSR International for the above referenced <br /> site <br /> EHD approves of discontinuing groundwater sample analyses of MTBE,TBA, DIPE, ETRE and <br /> TAME in monitoring wails MW12 through WVV19 and of discontinuing groundwater sample <br /> analyses of 1 2-DCA and EDB In monitoring wells MW 12 through MW 16 <br /> To evaluate the site as a potential source of 1,2-DCA in the groundwater, ENSR proposes to t <br /> —analyze for 1 2-DCA using EPA Method 8260 on groundwater samples collected from MW <br /> TT�through MW10 for a penod of one year EHD approves thisproposal but requires that— - - -I� <br /> -groundwater_samples from NP1 also be analyzed for 1,2-DCA and EDB. In addition, soil data <br /> from past Investlgattons sbe reviewed-to see If analysis for f,2-DCA was performed=EHD - <br /> hould =1' <br /> _reviewed Its file and-found that the soil sample collected beneath the waste oil underground <br /> storage tank removed from this site In 1988 was analyzed for 1,2-©CA with aresu#t-of less`tkian <br /> 03 mg/kg If soil data cannot be found other investigation may be required to determine the <br /> source of the 1,2-DCA. Waiting for a year of groundwater sample results to detemnune <br /> appropriate action is not acceptable <br /> if yr u ha e any ques+ions contact me at(209) 4e8-3449 <br /> Donna He-an, nEHS, Director - JAN 0 5 2094 <br /> Environmental Health Department <br /> ono Su er�iss^ R <br /> Margaret l-ag p g EH S <br /> Unit IV <br /> C Jim Barton-CVRWOCS <br /> David Irey- SJCADA <br /> ivts Helen McCrary <br /> Ben Heningburg - ENSR <br />