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��Clayton <br /> GROUP SERvif ES <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 sampling of three wells in the vicinity of former underground fuel <br /> storage tanks (USTs) Activities were conducted under the oversight of the San Joaquin <br /> County Public Health Services, Environmental Health Division(PHD/EHD) The Local <br /> Oversight Program (LOP) Site Code is 1204 <br /> The following report presents the procedures related to the Second Quarter 2003 <br /> Groundwater Monitoring conducted following the work plan <br /> 2.0 BACKGROUND <br />' The facility 1s 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 Subsequent <br /> soil sampling activities were conducted in October 2000 (Klelnfelder, January 12, 2001) <br /> Based on information from the October 2000 sampling, the PHD/EHD requested that a <br /> limited groundwater investigation be conducted which is the subject of the current <br />' investigation This request included the installation of three groundwater monitoring <br /> wells on the periphery of the zone of impact to determine if significant migration of fuel- <br /> related compounds is occurring These wells are required to be monitored quarterly for a <br />' period of one year Following this monitoring period, the site status is to be reevaluated <br /> 3.0 GROUNDWATER MONITORING AND SAMPLING <br />' Following the requirements of the PHD/EHD for quarterly groundwater monitoring, the <br /> first monitoring event took place on April 28, 2003 <br />' Prior to purging and sampling on this date, the depth to groundwater and total well depth <br /> were measured as follows <br /> • <br /> 1 <br /> 1 <br /> IS 1Pro)1P022631Q2 Rpt doc <br />