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• _Tl.,EGE_ 1386 E. D.CA 95 STREET <br /> �/�/ WOODLAND,CA 95695.9609 <br /> FAX VESTERN GEO-ENGINEERS 9161 6 2-4541 <br /> ._ (916; 662-4541 <br /> CALIF.CONTRACTOR#513857 A CORPORATION <br /> REGISTERED GEOLOGISTS <br /> January 17, 1991 <br /> mr. John lmargowski <br /> Environmental Director <br /> Wickland Properties <br /> 3765 Challenge way <br /> Sacramento, CA 95815 <br /> (916) 921-1100 <br /> RE: Pilot Test for vapor extraction, former Regal Station 604, <br /> 1448 N. E1 Dorado Street and Harding way, Stockton, California. ' <br /> Dear Mr. Margowski: <br /> INTRODUCTION <br /> } <br /> This letter documents the results of the pilot test for vapor <br /> extraction into activated charcoal at the above mentioned site. s <br /> PILOT TEST <br /> 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 catapacted 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 O.o2 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 an 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 day. Leaks were discovered in the pump on December 131 <br /> 1990 and the test was temptint <br /> il the pump was <br /> orarily discontinued <br /> fixed. The test was restarted on 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 c: until break <br /> + through, which ever occurred first. Vapor extraction wells F1, P3 <br />