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-r-....-...rte <br /> EG - OO E REAMER STREET <br /> Y!' <br /> Y!' �J WOODLAIVD,CA 95695-9603 <br /> -- WESTERN GEO-ENGINEERS FAX{916}662-0273 <br /> CALIF CONTRACTOR#513857 A CORPORATION (916) 662-4541 <br /> REGISTERED GEOLOGISTS <br /> January 17, 1991 <br /> Mr. John Margowski <br /> Environmental Director <br /> Wickland Properties <br /> 1765 Challenge Way <br /> Sacramento, CA 95815 <br /> (916) 921-1100 <br /> RE: Pilot Test for vapor extraction, former Regal Station 604, <br /> 1448 N. El Dorado Street and Harding Way, Stockton, California. <br /> Dear Mr. Margow&ki: <br /> INTRODUCTION <br /> This letter documents the results of the pilot test for vapor <br /> extraction into activated charcoal at the above mentioned site. ' <br /> PILOT TEST <br /> �1 Gasoline range hydrocarbons were known to exist beneath the pump <br /> island dispensers and undergound storage tank areas. The tank <br /> excavation and product dispenser areas were overexcavated and the <br /> majority of contaminated soil was removed, aerated, and then used <br /> as compacted engineered fill for the excavations. Pea gravel was <br /> - first used to backfill the excavations to the 12 foot depth _ <br /> followed by the compacted native soil to the surface. On October <br /> 8 and 9, 1990 three vapor extraction wells were installed into <br /> these excavated areas to the 40 foot depth using 2 inch SCH 40 PVC <br /> with 0.02 inch slot casing for the wells. <br /> On December 5, 1990, activated charcoal in four-85 gallon tub <br /> scrubs was delivered to the site, and on December 6, 1990 the <br /> wells were manifolded to the treatment area, above ground. The <br /> blower was installed on December 10, 1990, and the test began <br /> that same clay. Leaks were discovered in the pump on December 13, <br /> 1990 and the test was temporarily discontinued until the pump was <br /> fixed. The test was restarted �Pn December 27, 1990 and terminated <br /> on January 4, 1991, when breakthrough was noted on the exhaust of <br /> the 4 .85 gallon charcoal canisters. <br /> TEST PROCEDURES <br /> The test was to proceed for a duration of one month or until break <br /> through, which ever occurred first. Vapor extraction wells P1 , P3 <br />