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1386 EAST BEAMER STREET <br /> W CrZ3 ESTER N WOODLAND CA 95776-6003 <br /> GEO-ENGINEERS FAX (916) 662-0273 <br /> CALIF CONTRACTOR#513857 A CORPORATION (916) 668-5300 <br /> . REGISTERED GEOLOGISTS <br /> April 7, 1993 <br /> Mr. John Margowski <br /> Manager, Environmental Affairs <br /> Wickland Properties <br /> P O. Box 13648 <br /> Sacramento, CA 95853-4648 <br /> (916) 921.-1100 (FAX 916) 921-3610 <br /> RE : Results of sampling of the influent-effluent of vapor <br /> extraction system, former Resat Station 604 , 1448 N. El Dorado <br /> Street and Harding Way, Stockton, California, under Authority to <br /> Construct Permit # AP 91-106 <br /> Dear Mr. Margowski . <br /> As you have instructed, Western Geo-Engineers (WEGE) is <br /> continuing to check the effluent and influent of the system as <br /> outlined in Permit # AP 91-106 . The following are the results of <br /> the sampling for the period April. 24, 1993 to March 15, 1993 . <br /> iINTRODUCTION <br /> This letter documents the results of the ongoing- sampling of the <br /> active carbon scrub controlled vapor extraction system at the <br /> above mentioned site <br /> SITE STATUS <br /> CURRENT OPERATIONS <br /> During July, 1992, four new vapor extraction wells were installed <br /> while drilling conformation soil borings at the site . The wells <br /> are VSB3 , VSB5, VSB9 and VSB11 . Vapor extraction well P1 was <br /> drilled up and destroyed at this time . The vacuum extraction <br /> system currently consists of two Rotron DR505 blowers pulling 67 <br /> cubic feet per minute (CFM) of soil vapor from the following <br /> wells VSB3 , VSB5 , VSB9, VSB11, and MW5 . As of March 15 the <br /> System is removing 8 73 pounds per day of TFH hydrocarbons <br /> In order to gain a better understanding of the processes <br /> occurring at this site, we have began to test the vapor stream for <br /> carbon dioxide content From this added analysis we can estimate <br /> the amount of hydrocarbons destroyed at the site by subsurface <br /> biological and chemical oxidation, driven for the most part by <br /> the vapor extraction As of 03/15/93 , the current CO2 production <br /> indicates that 64 6 pounds per day of hydrocarbon is being <br /> oxidized. <br /> page 1 of R604 , 04/07/93 <br />