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v <br /> 1.0 INTRODUCTION/HISTORY <br /> This report is being submitted in response to a request by San Joaquin County Public Health <br /> ' Services, Environmental Health Division (SJCPHS) for an investigation of potential soil <br /> contamination beneath the former underground fuel storage tanks at the project site, 4233 and <br /> 4343 Hubbard Avenue, Stockton, California (Figure 1). On Friday, May 19, 1989, one 2,000 <br /> gallon unleaded gasoline storage tank and one 5,000 gallon diesel storage tank were uncovered <br /> and prepared for removal under the direction of Tish Resch and Carol Oz of SJCPHS. The <br /> unleaded tank was removed and inspected on May 19, 1989. No soil samples were collected <br /> at the time. Sampling was scheduled for Monday, May 22, 1989. The diesel tank was removed <br /> on May 20, 1989 and both tanks were transported under hazardous waste manifest to a state <br /> licensed facility. No holes were noted in either tank or associated piping. The presence of an <br /> underground telephone line necessitated the removal of approximately 50-70 cubic yards of soil <br /> from the west end (fill end) of the tanks to allow removal of the tanks. <br /> On May 22, 1989, after all soils which were visually identified to be contaminated (and/or <br /> V <br /> required excavation to allow for tank removal) had been excavated from the tank pit <br /> v (approximately 75-100 yards total), soil samples were collected from beneath the former tanks, <br /> the associated piping, and from the excavated material (Figure 2) under the direction of Tish <br /> L, Resch. Analytical results indicated that no contamination remained in soils beneath the former <br /> tanks or piping. Laboratory results for the initial soil sampling are summarized in Table 1. <br /> Laboratory data sheets are presented in Appendix I. Excavated soils were aerated on-site. <br /> �. The soil sampling procedure utilized following the tank removal and overexcavation and thus, <br /> the veracity of the sample results, have recently been questioned by the SJCPHS. The SJCPHS <br /> has therefore requested that soil conditions beneath the former tanks be investigated further. <br /> 2.0 BACKGROUND TECIINICAL DATA <br /> 2.1 Site Owner and Contact Person: <br /> SITE OWNER: A & K Railroad Materials, Inc. <br /> Post Office Box 30076 <br /> Salt Lake City, UT 84130 <br /> R-010792ML 1 <br /> V <br />