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v� j 2 <br /> O� � 0 <br /> Port of Stockton Quo-��� <br /> General Offices: P.O. Box 2089, Stockton, CA 95201-2089 <br /> (209) 946-0246/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 (Port) 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 Port 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/l. 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 />