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- r <br /> OVEREXCAVATION AND SOIL STOCKPILE SAMPLING# REPORT <br /> Pacific Plumbing and Heating <br /> 1044 South Aurora Street <br /> Stockton, California <br /> 1. 0 INTRODUCTION <br /> In accordance with a request from our client, Mr. Harry Shuler, Jr. <br /> of Pacific Plumbing and Heating, Geological Audit Services, Inc. <br /> (GeoAudit) has prepared this report summarizing the excavation and <br /> sampling of soil from a former underground storage tank cavity at <br /> 1044 South Aurora Street, Stockton, California (the site) . <br /> 2 . 0 BACKGROUND <br /> The site is located in a flat, industrial area of Stockton (Figure <br /> 1) . The site is- owned and occupied by Pacific Plumbing and Heating <br /> (Figure 2) . <br /> On 2 December 1992 , one 550-gallon leaded gasoline tank and the <br /> associated pumps and piping were removed from the site by Falcon <br /> Energy Associates (FEA) . A geologist from GeoAudit collected one <br /> soil sample from beneath the tank and two samples from the <br /> stockpiled soil. The samples were analyzed for total petroleum <br /> hydrocarbons (TPH as gasoline, EPA 8015m) , volatile aromatics <br /> (BTE&X, EPA 8020) , EDB (EPA 8011m) and total lead (EPA 7421) . <br /> The sample collected from under the tank contained TPH as gasoline <br /> at a concentration of 880 ppm. Volatile aromatics were detected at <br /> 0. 60, 3 . 5, 11 and 100 ppm for benzene, toluene, ethylbenzene and <br /> total xylenes respectively. Total lead was detected at a <br /> concentration of 8 .4 ppm, while EDB was below detection limits. <br /> Subsequently, FEA received approval to enlarge the excavation to <br /> approximately 20 X 12 feet and deepen it to a depth of <br /> approximately 24 feet. This soil was added to the existing <br /> stockpile next to the excavation. A total of approximately 200 <br /> yards of contaminated soil was removed. After excavation was <br /> completed, GeoAudit was retained to collect soil samples. <br /> 3.0 PROCEDURES <br /> On 16 July 1993 , an excavator was utilized to collect soil samples <br /> from the excavation. At the direction of Mr. Michael Infurna of the <br /> San Joaquin County Public Health Services/Environmental Health <br /> Division (PHS/EHD) , four samples were collected from the side walls <br /> and one sample from the bottom of the excavation using the <br /> excavator bucket. At the direction of Mr. Infurna, eight samples <br /> were also collected from the soil stockpile. <br /> 1 <br />