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e>axe CI� F Working to Restore Nature �" 1710 Main Street APR 2 8 1992 Escalon, CA 95320 April 24, 1992 Phone:(209)838-3507 ENVIRONMENTAL HEALTH FAX: (209)838-3509 PERMIT/5ERVICCs Ms. Donna Heran, REHS San Joaquin County Public Health Services Environmental Health Division P.O. Box 2009 Stockton, CA 95201 Re: Site Code 2226, 2004 East Mariposa Road, Stockton California Dear Ms. Heran: I am writing on behalf of Mr. Bill Williams of Economy Fence regarding the above referenced site. In April 25, 1991, one 2,000 gallon underground (u/g) gasoline storage tank was removed at the subject site by Crisp Tank Testing. Two soil samples were collected beneath the tank, one at each end. Soil samples were analyzed for benzene, toluene, ethylbenzene, xylene (BTEX), total petroleum hydrocarbons as gasoline (TPHG), ethylene dibromide (EDB), and total lead by FGL Environmental utilizing EPA methods 8020, 3050, 8010, and 7421. Analytical results are summarized in Table 1. Laboratory data sheets are included in Attachment 1. Laboratory analyses of soil samples detected very low levels of residual hydrocarbons in soils beneath the former tank (Table 1). In correspondence dated August 28, 1991, San Joaquin County Public Health Service (SJCPHS) informed Mr. Williams that the subject site could not be recommended for final closure. Your decision was based upon the results of a leaching potential analyses performed on the site as recommended by the LUFT Manual. The leaching potential analysis is presented in Section V of the SJCPHS UGST worksheet for site closure (Worksheet, Attachment 2). The leaching potential analysis was designed to permit estimating concentrations of total petroleum (TPH) and BTEX that can be left in place without threatening groundwater. Three levels of TPH and BTEX concentrations were derived from modeling for sites which fall into 1041592.ktt