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b <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> �o° F co Unit Supervisors <br /> 2 ' Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • :. —;: P Program ManagerTelephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 4� FLaurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (2O9) 464-0138 Mark Barcellos,R.E.H.S. <br /> AUG 2 6 2004 <br /> SII <br /> !i KAREN PETRYNA <br /> SHELL OIL PRODUCTS <br /> 20945 S WILMINGTON AVE <br /> CARSON CA 90810 <br /> 'RE: SHELL SERVICE STATION <br /> 2320 ELDORADO STREET <br /> STOCKTON CA 95204 <br /> r <br />• San Joaquin County Environmental Health Department (EHD) has reviewed SecondQzrarter <br /> 2004 Groundwater Monitoring Report and Receptor Survey dated July 22, 2004 prepared by Cambria <br /> Environmental Technology, Inc. Total Petroleum Hydrocarbons as gasoline (ITH-g), <br /> benzene, and oxygenates such as tertiary butanol ('IBA) and di-isopropyl ether (RIPE) have <br /> 1 been consistently detected in groundwater samples from monitoring well MW-1. Analytical <br /> results of groundwater samples from MW-1 IN April 2004 were 2,700 micrograms per liter <br /> (ug/1) of TPH-g, 57 ug/1 of benzene, 33 ug/1of TBA, and 9.3 ug/1 of DIPE. Low <br /> concentrations of Methyl tert-butyl ether (MTBE) and TBA were consistently detected in <br /> MW-3 and MW-4,but TPH-g and benzene were non detect. Analytical results of MW-3 <br /> li groundwater samples were 18 ug/1 of MTBE and 5.7 ug/1 of TBA, and 0.75 of MTBE for <br /> MW-4 groundwater samples in April 2004. Historical groundwater low in the area is <br /> approximately 75 feet bsg according to San Joaquin County Flood Control Depth to Water <br /> map for 1993. <br /> MW-1 thru MW-3 are screened from 30 to 50 feet bsg, and MW-4 from 35 to 50 feet bsg. <br /> The vertical and lateral extent of the contamination has not been defined. Submit a work <br /> plan that will define the vertical and lateral extent of the groundwater contamination to <br /> EHD by October 5, 2004. Please contact Jeffrey Wong at (209) 468-0335 if you have any <br /> !I questions. <br /> Donna Heran, REHS,Director- <br /> Environmental Health Department <br /> "j <br /> F _.. v I J <br /> Jeffrey Wong, Senior REHS Margaret gono, REUHS <br /> LOP/Site Mitigation Unit Supervisor <br /> c: RWQCB, Central Valley Region—James L. L. Barton <br /> c: Cambria—Aubrey Cool <br />