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QUARTERLY REPORT <br /> Western Lift <br /> 3430 South El Dorado Street <br /> ' Stockton, California <br /> 1.0 INTRODUCTION <br /> In accordance with a request from Mr. John Urrutia of the Bank of <br /> ' Stockton, Geological Audit Services, Inc. (GeoAudit) has performed <br /> quarterly monitoring procedures at 3430 South El Dorado Street in <br /> Stockton, California (the site) . This report describes the water <br /> sampling procedures and presents the results. <br /> 2 . 0 BACKGROUND <br /> ' 2 . 1 Site Location <br /> ' The site is located in a flat industrial area south of Stockton <br /> (Figure 1) . The facility consists of a large warehouse and <br /> adjoining office and exterior fenced parking/delivery area (see <br /> Figure 2) . Cutter Lumber is located to the north of the site, and <br /> currently manufactures wooden pallets. <br /> 2.2 UST Removal <br /> ' Three underground tanks were removed from the delivery area in June <br /> of 1991. Gasoline contamination was detected in three of the seven <br /> ' soil samples collected from the excavation, indicating that an <br /> unauthorized release of hydrocarbons had occurred and that an <br /> assessment of the site was required. Sample results were summarized <br /> ' in the Site Contamination Workplan dated July 24, 1991. <br /> 2.3 Excavation <br /> ' The assessment of the site was performed in two phases. Each phase <br /> consisted of overexcavation followed by the collection and analysis <br /> of soil samples from the walls and floor of the excavation. The <br /> ' excavation phases and sampling are described in the Preliminary <br /> Investigation and Evaluation Report (PIER) dated December 11, 1991. <br /> On May 1 1992 , backfilling of the excavation was completed. The <br /> excavation was backfilled to grade with pea gravel. <br /> 2 .4 Monitoring Well Installation <br /> On June 1 1992 , a groundwater monitoring well was installed <br /> immediately north of the former tank excavation. On June 4 , 1992 a <br /> water sample was collected from the well and analyzed for total <br /> petroleum hydrocarbons (TPH as gasoline and diesel) and volatile <br /> aromatics (BTE&X) . TPH contamination was detected in the water <br /> sample and the San Joaquin County Public Health Services - <br /> ' 1 <br />