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� 4 <br />4A� � <br />Port of Stockton op _70 <br />General Offices: P.O. 'Box 2089, Stockton, CA 95201-2089 <br />(209) 946-02461 FAX (209) 465-7244 or (209) 466-5986 <br />February 22, 1999 <br />Ms. Donna Heran, REHS <br />Director of Environmental Health Division <br />San Joaquin Public Health Services, Environmental Health Division <br />304 East Weber Avenue, Third Floor <br />Stockton, CA 95202 <br />Re: 'Underground Storage Tank (UST#7 through 10) Removal, <br />Port of Stockton <br />Dear Donna: <br />The Port of Stockton (Pork) is pleased to forward the enclosed analytical <br />results of representative soil (both stockpile and inside the trench) and <br />groundwater samples from the Underground Storage Tanks (USTs) excavation <br />trenches of the above referenced Underground Storage Tanks (UST). These <br />USTs were properly removed from the Pork on or about January 5, 1999, under <br />the supervision of the San Joaquin Health Services/Environmental Health <br />Division (PHS/EHD). <br />The analytical results clearly indicate that concentrations of all petroleum <br />constituents are non -detect. There are very low concentrations of lead that were <br />detected, which are clearly background concentrations. The following technical <br />discussion and rationale are provided for the background lead concentrations <br />encountered in the soil samples for these USTs sites: <br />Lead concentrations range from 1.25 to 52 mg/I. No lead was detected in the <br />groundwater sample. According to Boyajian and Ross (September 28, 1998), <br />lead was used as a gasoline additive for many years in the form of tetraethyl <br />lead. According to the American Society for Testing and Materials (ASTM) <br />Guidance document for Risk -Based Corrective Action Applied at Petroleum <br />Releases Sites (ASTM E1739-95), tetraethyl lead decomposes to inorganic <br />lead in dilute aqueous solutions and in contact with other environmental <br />media. It remains as organic lead in free gasoline products; however, no free <br />product was observed at any of the above referenced USTs excavation sites. <br />It is therefore reasoned that the lead is in inorganic state. US EPA Region IX <br />preliminary Remediation Goals (May 1998) for inorganic lead in soil are 130 <br />mg/kg for residential soils and 1,000 mg/kg for industrial soils. The lead <br />concentrations found at the above sites are far below these remediation <br />goals. <br />GENERAL OFFICE: 2201 W. WASHINGTON ST., STOCKTON, SAN JOAQUIN COUNTY, CALIFORNIA <br />