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F +� <br /> SER`�1TICESI'UBLICHEALTH �-awy <br /> SAN JOAQUIN COUNTY m <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue,Third Floor • Stockton, CA 95202 �rFOR <br /> 209/468-3420 <br /> OCT 0 5 2001 <br /> JAMES TAYLOR <br /> CONTI GROUP COMPANIES INC <br /> 2 PRUDENTIAL PLAZA <br /> 180 STETSON DRIVE <br /> SUITE 2800 <br /> CHICAGO IL 60601 <br /> ROBERT MENTELOS <br /> PENNY NEWMAN GRAIN <br /> 1805 HARBOR ST <br /> STOCKTON CA 95203 <br /> RE: CONTINENTAL GRAIN CO Site Code: 1132 <br /> 1805 HARBOR ST <br /> STOCKTON CA 95203 <br /> Three soil borings and monitoring wells,MW4,MW5, and MW6 were installed at the above <br /> referenced site in April and June 2000. Four quarters of groundwater samplings have been <br /> conducted since the installation of the monitoring wells. San Joaquin County Public Health <br /> Services,Environmental Health Division (PHS/EHD) has reviewed the latest quarterly <br /> monitoring report,Monitoring Report First Qramr 2001 dated May 14, 2001. Free product <br /> continued to be present in MW2 during the last 3 quarters and samples were not collected. <br /> Analytical results of groundwater samples from MW4 ranged between 1,800 to 2,200 <br /> micrograms per literµg/l of Total Petroleum Hydrocarbons as diesel PH-d) between <br /> September 2000 and March 2001. Analytical results of the samples from the sentinel wells <br /> MW1,MW5, and MW6 have been consistently not detect for TPH d,TPH gasoline, <br /> aromatic hydrocarbons (BTEC, and oxygenates. <br /> Analytical results of the soil samples collected from MW4 at 20 feet below surface grade <br /> (bsg) were 1,100 milligrams per kilogram(mg/kg) of'[PH-d, and at 25 feet bsg were non <br /> detect. This is consistent with the previous results of soil samples collected froinMW2, <br /> MW3,SB 1, and SB2 in the vicinity of the former underground storage tank area,where the <br /> highest analytical results were from samples collected from 20 feet bsg,and the results from <br /> 25 feet and 30 feet bsg decreased. Submit a corrective action plan (CAP) to PHS/EHD that <br /> includes the mass balance calculation of the contamination remaining in soil and <br /> groundwater, and a cost-effectiveness evaluation of different remediation technologies for <br /> the clean up of the contamination. Submit the CAP by November 30, 2001. <br /> PHS/EHD agrees with the report that due to the minimal thickness of the free product in <br /> MW2,the free product should be removed by hand bailing instead of a passive skimmer <br /> A Division of San Joaquin County Health Care Services <br />