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_WE - 1386 E.REAMER STREET <br /> WOODLAND,CA 95695-9603 <br /> WESTERN GEO-ENGINEERS FAX(916)662-0273 <br /> CALIF.CONTRACTOR 0 513857 A CORPORATION (916) 662-4541 <br /> REGISTERED GEOLOGISTS <br /> December 6, 1990 <br /> Mr. John Margowski <br /> Environmental Director <br /> Wickland Properties <br /> 1765 Challenge May <br /> Sacramento, CA 95815 <br /> (916) 921-1100 <br /> RE: Pilot Tesc for vapor extraction, former Regal Station 604, <br /> 1448 N. El Dorado Street and Harding Nay, Stockton, California. <br /> Dear Mr. Margowski: <br /> INTRODUCTION <br /> This letter documents the scheduled start up of the pilot test <br /> for vapor extraction into activated charcoal at the above <br /> mentioned site. <br /> PILOT TEST <br /> Gasoline range hydrocarbons were known to exist beneath the pump <br /> island dispensors and undergound storage tank areas. The tank <br /> excavation and product dispensor areas were overexcavated and the <br /> majority of contaminated soil has been removed, aerated, and then <br /> used as compacted engineered fill for the excavations. Pea gravel <br /> was first used to backfill the excavations to the 12 foot depth <br /> followed by the compacted native soil to the surface, see figure <br /> 3D-Areas of pea gravel and wells. On October 8 and 9, 1990 three <br /> vapor extraction wells were installed into these excavated areas <br /> to the 40 foot depth using 2 inch SCH 40 PVC with 0.02 inch slot <br /> casing for the wells. <br /> On December 5, 1990, activated charcoal in 85 gallon tub scrubs <br /> were delivered to the site, and on December 6, 1990 the wells were <br /> manifolded to the treatment area, above ground. Me blower will <br /> be installed on December 10, 1990, at which time the test will <br /> begin. <br /> TEST PROCEDURES <br /> The test will proceed for a duration of one month or until break <br /> through, which ever occurs first. Vapor extraction wells P1, P3 <br /> and EX will be connected to a vacuum system (1HP Rotron Blower) <br />