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t. <br /> HEALTH DEPARTMENT <br /> ENVIRONMENTAL <br /> pP�'u�N- C SAN JOAQUIN COUNTY Unit Supervisors <br /> ?• - Carl Borgman,R.E.H.S. <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor <br /> Director <br /> Al Olsen,R.E.H.S. Stockton, California 95202 Mike Huggins,R.E.H.S.,R.D.I. <br /> -2708 Douglas W.Wilson,R.E.H.S. <br /> Margaret La orio,R.E.H.S. <br /> P Program Manager Telephone: (209) 468-3420 g g <br /> • oQc1 Fotiza� Laurie A.Cotulla,R.E.H.S. Fax: 209 464-0138 Robert M ruell s,R.E.H.S.. <br /> Program Manager � ) Mark$arcellas,R.E.H.S. <br /> SEP 0 9 2902 <br /> JAMES TAYLOR ROBERT MENTELOS <br /> CONTI GROUP COMPANIES INC PENNY NEWMAN GRAIN <br /> 1805 HARBOR ST <br /> 2 PRUDENTIAL PLAZA <br /> 180 STETSON DRIVE STOCKTON CA 95203 <br /> SUITE 2800 <br /> CHICAGO IL 60601. <br /> RE: CONTINENTAL GRAIN CO Site Code: 1132 <br /> 1805 HARBOR ST <br /> STOCKTON CA 95203 <br /> San Joaquin County Environmental Health Department (EHD) has received Corrective Action <br /> Plan (CAP) dated June 18, 2002 and Corrective Action Plan Addendum dated July 8, 2002 <br /> prepared by ATC Associates, Inc. The CAP included three remedial alternatives to address <br /> the diesel contamination in the soil and groundwater: human health risk assessment study, <br /> over-excavation of the impacted soil with extraction of the impacted groundwater, and in- <br /> situ vapor extraction with groundwater extraction. The cost of over-excavation with <br /> groundwater extraction is estimated to be between $50,000 and$100,000. ATC proposed <br /> excavating a hole 15 by 48 feet to a depth of 12 feet below surface grade (bsg) in the area of <br /> the former underground storage to remove 320 cubic yards of impactgd soil and pumping <br /> out approximately 10,000 gallons of groundwater that may accumulate in the excavation. <br /> The CAP is not approved as it is not possible to evaluate the potential beneficial effects of <br /> the proposed actions at this time. It is unknown if clean fill or contaminated soil was used <br /> to back-fill the 10,000-gallon underground storage tank (UST") pit excavation at the time of <br /> the tank removal in 1988. Since the shallowest soil samples analyzed were collected between <br /> 14 and 17 feet bsg from the UST excavation, the CAP needs to provide documentation to <br /> demonstrate that excavation to 12 feet bsg would remove any significantly impacted soil. <br /> EHD is concerned that excavating only to 12 feet bsg may not address the core of the <br /> contaminated soil. The following table lists analytical results of the soil samples collected <br /> from soil borings in the area of the UST: <br /> Table 1. Anai tical Results of Soil Boring and Monitorin Well soil samples <br /> SB-1 SB-2 MW-1 MW-2 MW-3 MW-4 <br /> 15' bs 3,500 4,100 ---- ---- ---- <5.0 <br /> 20' bsg 6,800 ---- <1 20.5'bs 14,000 (20.5' bsg) 270 (N.YbyL 1,100 <br /> 25'bsg 3 ---- ---- ---- <5.0 <br /> 30' bs 20 ---- 3.9 28.5bs 1,500 28.5'bs 12 28.5'bs ---- <br /> AD in milligrams per kilograms (mg/kg) of Total Petroleum Hydrocarbon as diesel (TPH-d) <br />