Laserfiche WebLink
1 <br /> �� - 1386 EAST BEAIvIER STREET <br /> WEGE ES'TERN WOODLAND, CA 95776-6003 <br /> GEO ENGINEERS FAX (916) 662-0273 <br /> (916) 665-5300 <br /> CALIF CONTRACTOR#513857 A CORPORATION <br /> REGISTERED GEOLOGISTS <br /> April 30, 1993 MAY 0 3 1.993 <br /> ENVIR0 NMFNTA[ .++qL-rH <br /> Mr. John Margowski PWS Vj�°r�sv` r� <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. E1 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 /> 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, VS311, 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 04/23/93 , the current CO2 production <br /> indicates that 60 . 1 pounds per day of hydrocarbon is being <br /> oxidized. <br /> page 1 of R604, 04/30/93 <br />