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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street 1 r 04 <br /> Escalon, California 95320-1927 <br /> Telephone. (209) 838-9888 <br /> Facsumie. (209) 838-9883 <br /> August 15, 2000 <br /> Ms Lon Duncan <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Workplan for the Installation of Groundwater Monitoring Wells <br /> 640 N El Dorado Street, Stockton, California <br /> Site Code 1090 <br /> Dear Ms Duncan <br /> This Workplan is submitted by Ground Zero Analysis, Inc (Ground Zero) on behalf of Mr Gene <br /> Gabbard in response to your directive dated April 17, 2000 This Workplan describes the proposed <br /> methodologies for the installation and sampling of four groundwater monitoring wells The location of <br /> the site is shown on Figure 1 <br /> SITE BACKGROUND <br /> The site currently operates as an automotive sales and service center, and previously utilized one <br /> 250-gallon UST for storage of waste oil The former UST was located approximately 100 feet <br /> south of the Park Street entrance and approximately 53 feet west of the entrance to the alley that <br /> borders the east side of the building Figure 2 presents a site plan showing the location of the <br /> former UST The UST was removed under permit from San Joaquin County Public Health <br /> Services, Environmental Health Division (PHS/EHD) on March 26, 1997 A soil sample <br /> collected from beneath the tank contained elevated levels of petroleum hydrocarbons, lead, and <br /> chlorinated solvents Analytical results of soil samples collected beneath the former UST are <br /> summarized in Table 1 <br /> In subsequent subsurface investigations conducted in January 1999 and October 1999, a total of <br /> eight soil borings were advanced in the vicinity of the former UST to investigate the vertical and lateral <br /> extent of soil contamination and to determine if groundwater beneath the facility has been impacted by <br /> . site operations Laboratory analyses of soil and groundwater samples collected during the <br /> investigations indicated that soil and groundwater in the immediate vicinity of the former UST has been <br /> G1Data1GROUNDZEIGABBARDVeports\MW_WORKPLAN doc <br />