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PUBLIC HEALTH SERVICES �,qtl ! !!Y. , <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D. , M.P. H. , Health Officer • c�.. P <br /> <lFURa, <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 <br /> RAYMOND FARMER <br /> BESS FARMER <br /> 3810 FOURTEEN - MILE DR <br /> STOCKTON CA 95219 <br /> RE: TOYOTA TOWN SITE CODE: 1151 <br /> 610 HUNTER ST <br /> STOCKTON CA 95202 <br /> WORKPLAN: Interim Remediation Plan DATED: October 24, 2001 <br /> PREPARED BY: ATC Associates Inc, (ATC) <br /> APPROVED g with Conditions (see below) <br /> DISAPPROVED 0 <br /> ADDENDUM 0 Submit by : Pic Z `F , 2 o e � <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (H&S <br /> 25299.37,subd.(c) (3) .) : <br /> ATC proposed installing a vapor extraction system (VES) for interim remediation : <br /> • Installation of two additional VES wells to 25 feet below surface grade (bsg) . Soil <br /> samples will be collected and selected for analyses. <br /> • Installation of a vacuum blower capable of at least 100 standard cubic-feet-per minute <br /> (cfm) <br /> • Installation of a thermal oxidizer of 200 — 250 cfin range and approximate <br /> temperature of 1400 degrees Fahrenheit that will achieve 90% to 95% destruction <br /> efficiency for off-gas abatement <br /> • Installation of a condensation separator <br /> • Installation of associated surface and sub-surface piping (2 feet bsg), valves, gauges, <br /> and meters, and control instrumentation <br /> • Air samples from the influent and effluent piping to evaluate destruction efficiency of <br /> the system once the first week of operation and after that once per month. <br /> ATC also proposed installing a groundwater air sparging (AS) system to remediate the <br /> contamination in groundwater: <br /> • Installation of two air sparging wells that are screened from 37 to 40 feet bsg. Soil <br /> samples will be collected and selected for analyses . <br /> A Division of San Joaquin County Health Care Services <br /> i <br />