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WALLACE • KUHL December 21, 1999 <br /> &ASSOCIATES INC. _ L <br /> Mr. Jeffrey Wong ! <br /> _ San Joaquin County Public Health Services <br /> Environmental Health Division { <br /> 304.East Weber Avenue, Third Floor - <br /> Stockton, California 95202 - <br /> Additional Information for the Proposed Feasibility Study <br /> - 404 WEST FREMONT STREET _ <br /> Stockton, California _ .. <br /> WKA No. 1628.09 <br /> The requested additional information for the proposed feasibility study is as <br /> • " follows: <br /> IM <br /> • soil vapor samples extracted from the vapor extraction well (VEW 1)will = <br /> _ - be collected at the sampling port using I-liter tedlar bags at specific <br /> intervals during the SVE pilot test. A minimum of six soil vapor samples z <br /> will be obtained from VEW 1 at 15 minutes, 45 minute, 1'/2 hours, 3 hours, <br /> 5%Z hours and 8 hours into the pilot test. A flame ionization detector(FID) <br /> will be used to monitor off-gas emissions from the extraction well and after <br /> the carbon filter every 15 minutes during the pilot test <br /> - • <br /> Geotecl;nical Engineering. two 175-pound vapor-phase granular activated carbon canisters (biofilters) <br /> F" <br /> will be used to treat off-gas emissions (remove petroleum hydrocarbons) <br /> The canisters will be equipped with sampling ports, <br /> Engineering Geology during the test: <br /> '$ temperature gauges, pressure gauges and an exhaust stack. In the event of <br /> Environmental Consulting _ -breakthrough during the pilot test,the positions of the canisters will be <br /> y _ switched _ <br /> _ Remediation Ser4ces - <br /> - • equipment utilized for the vapor extraction and air sparging pilot tests will <br /> Construction Inspection consist of a 5.5-horsepower skid mounted explosion-proof regenerative <br /> blower with a rated capacity of 280 standard cubic foot per minute(sefin), 5- <br /> Materials Testing _, horsepower Gast pressure blower, a 60-kilowatt MQ60 generator, a 40-gallon <br /> moisture separator, in-line 10 micron filter, a coalescing oil filter, _ <br /> 'instrumentation for measuring air velocity and barometric pressure, air flow <br /> rates,and vacuum pressure,polyvinyl chloride piping, fittings,magnehelic <br /> 3050 Industrial Blvd. pressure gauges, and wellhead connections, and air sample collection - <br /> -equipment <br /> „�.l Y. West Sacramento = <br /> CA 95691 - <br /> 91.6.372.1434 <br /> Fax 916.312.2565 } <br /> j <br /> Re rkd paPet <br />