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1.0 INTRODUCTION <br /> The subject property is a fire station operated by the City of <br /> t central Stockton (Figure 1) . <br /> Stockton, and located in vies <br /> On October 3, 1988 and January 9, 1989, soil samples were <br /> collected at the site during the removal ockton o 55 0 Sgallon <br /> on <br /> underground diesel s.:orag: tank by <br /> Equipment Company, Inc. Two samples were collected from <br /> beneath product piping and one from native soil beneath the <br /> former u/g storage tank. <br /> Laboratory analysis Of the samples indicated inthat elevated <br /> concentrations of certain petroleum by <br /> were present in soils beneath the former tank (Table 1) . <br /> Cn September 7, 1990, the former tank pit was enlarged and <br /> deepened in an attempt at complete source removal (Figure 2). <br /> Excavation was conducted under the general supervision tockton <br /> f, and <br /> according to the workplan prepared and submitted.by. Stockton <br /> Service Station, Equipment r:ompary, <br /> RESNA <br /> Industries/WaterWork Corp. (RESNA) personnel were present in <br /> a consulting capacity. <br /> Excavation proceeded until site attributes including public <br /> and private thoroughfares prevented further enlargement of the <br /> pit. Subsequent to excavation, WaterWork personnel collected <br /> 5 soil samples from the pit walls and one sample from the <br /> floor of the pit (Figure 2). <br /> Laboratory analysis of the samples indicate that petroleum <br /> hydrocarbon contaminants are present in soils still in place. <br /> I on the south and east walls of the pit as well as the pit <br /> fable. Laboratory lesults Of soil sampling report mforsare summarized in <br /> the excavation is <br /> Table 1. <br /> included as Appendix I, <br /> to safety considerations the pit was subsequently <br /> Due <br /> Due to <br /> with clean enriineered material and compacted to <br /> backfigrade. <br /> Soils removed during excavation were tockr,iled on-site and <br /> d under authorization of the San <br /> aerated for a 5-month perio <br /> Joaquin County Air Pollution Control District (APCD) . The <br /> soils were kept moist and were tilled several times during <br /> ral bacterial decay of di' sea <br /> aeration to increase natu <br /> contaminants. The aerated soils were <br /> esubsequentaly w tt:r ated <br /> to the City of Stocktor. Corp <br /> authorization of the San Joaquin County Public H ealt Services <br /> Environmental Health Division (SJCp€?S) <br /> 1 <br /> sFsaR915.rrp <br />