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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> (0i� y <br /> MICHELLE NOKES <br /> ANTIOCH TOYOTA <br /> 1810 SOMERSVILLE ROAD FB 0 6 <br /> ANTIOCH CA 94509 <br /> RE: DISCOVERY CHEVROLET SITE CODE: 2595 <br /> 1615 W 11 T" STREET <br /> TRACY CA 95376 <br /> San- Joaquin County Public Health Service/Environmental Health Division <br /> (PHS/EHD) recommends the following changes to the Work Plan for the above <br /> referenced site: <br /> 1) Label ail proposed soil borings and hydropunches. <br /> 2) lhclude analysis of oxygenates from all water samples using <br /> Environmental Protection Agency (EPA) Method 8260. <br /> 3) A boring through the former dispenser and determine vertical definition <br /> below groundwater. <br /> 4) A boring through the former pipeline near SB (see Figure 3 of the <br /> Subsurface Investigation Report dated June 6, 1997 prepared by Horizon <br /> Environmental Inc.) and determine vertical definition below groundwater. <br /> 5) Soil samples shall be collected until both following conditions are met: a) <br /> boring depth reachs below groundwater level, and b) the field screening <br /> with portable organic vapor meter(OVM) indicates two consecutive <br /> sampling intervals where no petroleum hydrocarbons are present. <br /> tt <br /> 6) Water samples from all borings in order to provide subsurface <br /> hydrocarbons contour data. <br /> A Division of San Joaquin County Health Care Services <br />