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�.. ENVIRO?MENTAL HEALTH EPARTMENT <br /> 0?- SAN JOAQUIN COUNTY Unit Supervisors <br /> Donna K. Heran, R.E.H.S. 304 East Weber Avenue,Third Floor Carl Borgman,R,E.H.S, <br /> Director Mike Huggins, R.E.H.S., R.D.I. <br /> �: �IIIIjj . <br /> Laurie A. Cotulla, R.E.H.S. Stockton,California 95202-2708 <br /> Douglas W.Wilson, R.E.H.S. <br /> +. Program Manager Telephone. (209)468-3420 <br /> p Margaret 1Jagorio,R.E.H.S. <br /> {1FOR Fax: (209) 464-0138 Robert McClellon, R.E.H.S. <br /> Website: www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> MAR 1 5 2006 <br /> DONALD SINCLAIR SHIRLEY THOMPSON <br /> 3780 LINNE ROAD 1239 ADAM STREET <br /> TRACY CA 95376 TRACY CA 95376 <br /> RE:. Sinclair Trucking SITE CODE: . 1916. <br /> 3780. Linne. Road <br /> Tracy. CA 95376 <br /> In November 1994 the above referenced site was placed in the San Joaquin County . <br /> Environmental Health Department's (SJC/EHD) local Oversight Program (LOP)for <br /> oversight of the assessment and remediation activities at contaminated underground <br /> 71 storage tank (UST) sites. <br /> In March 1987 one 350 gallon UST was removed from the site under SJC/EHD permit and <br /> inspection. One soil sample for analysis was collected at 8 feet below surface grade (bsg) <br /> 4 from beneath the UST; analytical results reported 3,800 milligrams per kilogram.(mg/kg) <br /> total petroleum hydrocarbons as gasoline (TPHg), and 69 mg/kg benzene in the sample. <br /> Subsequent site investigation, extending from 1995 to 2003, included the advancement of <br /> 19 soil borings and the installation of.six groundwater monitoring wells. <br /> Analytical results from samples collected throughout the site investigation indicated there <br /> j was significant soil contamination residing from approximately 6 feet to 15 feet bsg, and <br /> extending laterally across an area of approximately 30 feet by 60 feet. Reported <br /> concentrations of contaminants in soil samples collected during the site investigation <br /> ranged from 65 to 13,000 mg/kg TPHg, and from 0.124 to 171 mg/kg benzene. <br /> Only one monitoring well, MW-1, a shallow well-located in the former tank pit area, has <br /> had significant groundwater contamination. Thehighest historical contaminant <br /> concentrations in MW-1 were 7,250 micrograms per liter(gg/1)TPHg, and 946 gg/I <br /> ! benzene. The highest historical contaminant concentrations in MW-4, the well located <br /> { downgradient to MW-1, were 220 gg/l TPHg and 42.7 gg/I benzene. All other wells have <br /> been non-detect, including MW_101 which is a deep well located near MW-1, indicating <br /> the dissolved plume has not spread more than approximately 30 feet laterally and did not <br /> go vertically below the fine grained soils documented at approximately 19-20 feet bsg <br /> across the area of investigation. <br /> In August 2004 SJC/EHD approved a proposed corrective action plan for remediation of <br /> 1 the site by excavation of the contaminated soils. The estimated worst-case scenario <br /> 'r quantity of soil proposed for removal was 1,500 cubic yards. The State Water Resources <br /> Control Board Cleanup Fund pre-approved in writing removal of only 150 cubic yards, but <br /> IC in discussion with Geological Technics indicated they would likely reimburse for removal <br /> of up to 300 cubic yards. <br />