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1386 EAST BEAMER STREET { <br /> �jfi; E-STERVV WOODLAND, CA 95776-6003 ' <br /> GEO ENGINEERS FAX (916) 662-0273 i <br /> CALIF CONTRACTOR #513857 A CORPORATION (9 6) 668-5300 ' <br /> �j REGISTERED GEOLOGISTS <br /> April 30 , 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 Regal 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 March 15 , 1993 to April 23 , 1993 <br /> INTRODUCTION <br /> I <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 /> c <br /> SITE STATUS <br /> CURRENT OPERATIONS Y <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 r <br /> wells . VSB3 , VSB5, VSB9, VSB11, and MW5 As of March 15 the <br /> system as removing 8 73 pounds per day of TFH hydrocarbons <br /> r <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 4 <br /> biological and chemical oxidation, driven for the most part by <br /> the vapor extraction As of 04/23/93, the current CO2 production F <br /> indicates that 60 . 1 pounds per day of hydrocarbon is beang <br /> oxidized <br /> page 1 of R604, 04/30/93 <br /> 4 <br /> 1 <br /> i <br />