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ENVIRONMENTAL HEALTH DEPARTMENT <br /> pUl/y G SAN JOAQUIN COUNTY p <br /> P <br /> Donna K.Heran,R.E.H.S. Unit Supervisors <br /> -'X Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Mike Huggins,R.E.H.S.,R.D.1. <br /> Al Olsen,R.E.H.S. ' Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> C�<< ORa�P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> F <br /> Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax:.(209) 464-01.38 <br /> Mark Barcellos,R.E.H.S. . <br /> DEN AND BETTY UEDA FEB 0 7 zoos <br /> DEN' S AUTO REPAIR <br /> 626 E GAUN ROAD <br /> FRENCH CAMP CA 95231 <br /> RE: DEN'S AUTO REPAIR SITE CODE:1085 <br /> 308 SOUTH ELDORADO ST <br /> STOCKTON CA 95231 <br /> San Joaquin County Environmental Health Department(EHD)has received the SecondQuarter2004 Quarterly <br /> Report dated October 20,2004 prepared by Advanced GeoEnvironmental,Inc. (AGE),and a fax of the 3^' <br /> quarter 2004 analytical results" Different concentrations of dissolved contaminants including Total Petroleum <br /> Hydrocarbons as gasoline(IPH-g),certain aromatic hydrocarbons(benzene,ethyl-benzene,and xylenes),and <br /> oxygenate compounds such as Methyl Tert Butyl Ether(MTBE)and Di-isopropyl Ether(RIPE),have <br /> continued to be'detected in the groundwater samples collected on site. Toluene and Tertiary Butanol(TBA) <br /> were not detected(ND)in 2111 and 31'quarters 2004 but have been reported in previous sampling events. XX5th <br /> the exception of monitoring well\•1\V-1B (screened from 25 to 45 feet bsg),contaminants were reported in the <br /> remaining 5 dual-completed monitoring wells: MW-1A (screened from 60 to 65 feet below surface grade <br /> (bsg))which is located closest to the former dispenser,\I\V-2A (screened from 60 to 65 feet bsg)and 7.\iW2B <br /> (screened from 25 to 45 feet bsg)located closest to the former underground storage tanks(UST),and\IW-3A <br /> (screened from 60 to 65 feet bsg)and\f\V-3B(screened from 20 to 40 feet bsg)located furthest downgradient I <br /> (north-easterly to easterly)from the former USTs and dispensers. The highest contaminant concentration were <br /> 3,200 micrograms per liter(ug/1)of TPH-g and 2,100 ug/l of benzene in\1W-1A in 3rd quarter 2004" <br /> An investigation using cone penetration technology(CPT) conducted in November 2002 indicated the <br /> dissolved contaminants are present in the deeper water-bearing zones. Analytical results of the deepest grab <br /> groundwater samples collected from CPT-3 at depths of 112 to 118 feet bsg were 1,400 ug/I of TPH-g and 370 <br /> ug/I of Benzene,and at depths of 121 to 125 feet bsg were 140 ug/l of TPH-g and 3.7 ug/1 of Benzene. <br /> The lateral and vertical extent of the contamination has not been defined. Submit a work plan to investigate and <br /> define the extent of the contamination at this site to EHD by\'larch 15,2005. You.-are also required to perform a <br /> survey of well receptors within 2,000 radial feet of the site. The survey should include the addresses of any wells <br /> located,a map showing the locationof any wells,and any construction details of the wells. Contact the_ <br /> Department of Water Resources and local water purveyors for well locations. Submit this survey to EHD by <br /> March 31,2005. <br /> Please feel free to contact Jeffrey Wong at.(209)468-0335 if you have any questions. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> Jeffrey Wong,Senior REHS Marg�gorio,REHS <br /> LOP/Site Mitigation Unit Supervisor <br /> Cc: CRWQCB,Central Palley Region—James L.L.Barton,RG <br /> Cc: Advanced GeoEnvironmental,Inc.—Eyrene L. Fisher <br /> 0 <br />