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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 r <br /> Facsimile (209) 838-9883 <br /> April 4, 200200 <br /> b� - <br /> -o <br /> S -- <br /> Ms Lon Duncan O �� <br /> San Joaquin County <br /> Department of Environmental Health <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Workplan for Additional Groundwater Monitoring Well Installation <br /> 640 N El Dorado Stre--t, 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 December 31, 2001 This Workplan describes the <br /> proposed methodologies for the installation and sampling of three groundwater monitoring wells The <br /> location of 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 The UST was removed under permit from San Joaquin <br /> County Public Health Services, Environmental Health Division on March 26, 1997 A soil sample <br /> collected from beneath the tank contained elevated levels of petroleum hydrocarbons, lead, and <br /> chlorinated solvents <br /> Subsequent subsurface investigations were conducted in January 1999 and October 1999 to <br /> investigate the vertical and lateral extent of soil contamination and to determine if groundwater beneath <br /> the facility has been impacted by site operations <br /> Laboratory analyses of soil and groundwater samples collected during the investigations indicated <br /> that petroleum hydrocarbons, volatile organic compounds (VOCs), and lead impacted soil and <br /> G 1Data\GROUNDZEIGABBARDlworkplam\3_add_MW WORKPLAN doc <br />