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1 0C.,OIIP SE.viCES <br /> 1.0 INTRODUCTION <br />' Clayton Group Services, Inc (Clayton) was contracted by The Learner Company to <br /> implement the Groundwater Monitoring Well Installation and Quarterly Monitoring <br /> Workplan, prepared by Clayton and dated October 2002 Work was conducted at The <br />' Learner Company facility located at 2711 Navy Drive in Stockton, California (Figure 1) <br /> Work included the installation, momtonng, and sampling of three wells in the vicinity of <br /> former underground fuel storage tanks (USTs) In addition, grab soil samples from each <br />' of the borings were analyzed Activities were conducted under the oversight of the San <br /> Joaquin County Public Health Services, Environmental Health Division (PHD/EHD) <br /> 1 The Local Oversight Program (LOP) Site Code is 1204 <br /> The following report presents the procedures related to the installation of the monitoring <br /> wells and the First Quarter 2003 Groundwater Monitoring conducted following the work <br /> plan <br />' 2.0 BACKGROUND <br /> 1 The facility is a scrap metal recycling operation that receives scrap metal and processes it <br /> for shipment and sale to offsite buyers The facility plot plan, including the former <br /> location of the USTs, is shown as Figure 2 <br /> The UST system at the site consisted of a 4,000-gallon tank that stored gasoline and a <br /> 10,000-gallon tank that stored diesel fuel This system was used to fuel site vehicles <br /> The USTs were removed in August 1996 and impacted soil was identified Pursuant to <br /> discussions with the PHD/EHD, The Learner Company characterized a stockpile of soil <br /> that was generated during UST excavation and prepared it for use as backfill The <br />' characterization results indicated that the soil primarily was impacted by diesel fuel (up <br /> to 5,400 mg/kg), with lesser amounts of gasoline (up to 100 mg/kg), ethylbenzene (1 5 <br /> mg/kg), and total xylenes (7 1 mg/kg) The soil stockpile was mixed several times <br /> between December 1996 and March 1997 to introduce oxygen and enhance <br /> biodegradation of the hydrocarbons Approximately 93 cubic yards of impacted soil <br /> were used to backfill the excavation in March 1997 <br /> Following UST removal, the PHD/EHD also required that The Learner Company <br /> investigate soil near the former UST system to determine the vertical and lateral extent of <br /> 1 the hydrocarbon impact The Learner Company contracted Clayton to prepare the <br /> document entitled Underground Storage Tank Site Investigation Workplan dated June <br /> 1997 This document prescribed the sampling of soil and groundwater from a minimum <br /> of eleven locations within and surrounding the former location of the UST system The <br /> PHD/EHD approved the site investigation in a letter dated June 12, 1997, and The <br /> Learner Company contracted Kleinfelder to implement the workplan in October 2000 <br /> Kleinfelder presented the results of their investigation in a document entitled Limited Soil <br /> . and Groundwater Sampling Report dated January 12, 2001 In this investigation, soil <br /> samples were collected from within the excavation backfill horizon that contained the <br /> 1 <br /> S\Proj1P022631Q1 Rpt doc <br />