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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320.1927 <br /> Telephone: (209)838-9888 ENVIRONMENTAL HEALTH DIVISION <br /> Facsimile: (209) 838-9883 304 E. Weber Ave.Third Floor <br /> R O.ABooxp 30888, Stockton CA 95201-0388 MAY 2 9 2002 <br /> Denied <br /> May 24, 2002 Conditions ENVIRONMENT HEALTH <br /> Ms. Lori Duncan PERMIT/SERVICES <br /> Date ._� {o r�Z by nn/rw <br /> San Joaquin County <br /> Department of Environmental Health <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Revised Workplan for Additional Groundwater Monitoring Well Installation <br /> 640 N. El Dorado Street, Stockton, California <br /> Site Code: 1090 <br /> Dear Ms. Duncan: <br /> This revised workplan is submitted by Ground Zero Analysis, Inc. (Ground Zero) on behalf of Mr. <br /> Gene Gabbard in response to your letter dated April 18, 2002. This revised workplan describes the <br /> proposed methodologies for the installation and sampling of additional groundwater monitoring wells <br /> and addresses concerns raised in your letter. The 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 /> groundwater in the immediate vicinity of the former UST. The vertical extent of soil <br /> contamination has been defined at the source (boring SB3). No contaminants were detected <br /> deeper than 31 feet below ground surface (bgs). The lateral extent of soil contamination was also <br /> G:\Data\GROUMM\GABBARD\mr4l=\3_add_MW WORKPLAN.dw ' <br />