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ENVIRONMENTAL HEALTH DEPARTMENT <br /> Fp U I N SAN JOAQUIN COUNTY <br /> Unit Supermars <br /> Donna K Heran,R E H S Carl Borgn�an R E l i S <br /> 304 East Webet Avenue, Third Floor <br /> Du,ctnr Nlsl.e Hu—ins, R E N S R D C <br /> Al Olsen,R E H s Stockton California 95202-2708 <br /> Douglas W 'Arilson R E Fi S <br /> o� -�-_1A�P Pro �ur,r A1�,n f�L, Tele hone (209) 468- 20 Margaret L.agorso R E Fl S <br /> 4�°¢ Laurte d Cotulh,R E N S p <br /> Ang,an,Manages Fax (209) 464-0138 Robert McClellon,R E H S <br /> Mark Sarcelios R E ri S <br /> BOB HOPKINS DEC 3 0 2003 <br /> UNION OIL COMPANY <br /> 276 TANK FARM ROAD <br /> P Q BOX 1469 <br /> SAN LUIS OBISPO CA 93406 <br /> RE Former Unocal#2859 SITE CODE 1213 <br /> 1665 Pacific Avenue <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the °Evaluation of <br /> 1,2-Dichloroethane in 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, DIPS, ETBE and <br /> TAME in monitoring wells MW12 through MW19 and of discontinuing groundwater sample <br /> analyses of 1,2-DCA and EDB in monitoring wells MW 12 through MW16 <br /> To evaluate the site as a potential source of 1,2-DCA in the groundwater, ENSR proposes to <br /> analyze for 1 2-DCA using EPA Method 8260 on groundwater samples collected from MW 1 <br /> through MW10 for a period of one year EHD approves this proposal but requires that <br /> groundwater samples from NPI also be analyzed for 1,2-DCA and EDB In addition, soil data <br /> from past investigations should be reviewed to see if analysis for 1,2-DCA was performed EHD <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-DCA with a result of less than <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 sampie results to de-engine <br /> appropriate action is not acceptable <br /> If you have any questions contact me at (209) 468-3449 LJ 1 <br /> Donna Heran, RENS, Director JAS} <br /> 200 <br /> Environmental Health Department <br /> ........................... <br /> Margaret Lagorio, Supervising REHS <br /> Unit IV <br /> C. Jim Barton- CVRWQCB <br /> David Irey- SJCADA <br /> Ms Helen McCrary <br /> Ben Heningburg - ENSR <br />