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� 1386 EAST BEAMER STREET <br /> WEGlT ESTERN WOODLAND, CA 95776-6003 <br /> GEO ENGINEERS FAX (916) 662-0273 <br /> CALIF CONTRACTOR #513857 A CORPORATION (916) 668-5300 <br /> REGISTERED GEOLOGISTS <br /> Mr John Margowski September 14 , 1993 <br /> Manager, Environmental Affairs <br /> Wickland Properties <br /> P O Box 13648 <br /> Sacramento, CA 95853-4648 <br /> (916) 978-2500 , Fax (916) 978-2428 <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 July 19 , 1993 - August 20, 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 siEe <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 <br /> 79 75 cubic feet per minute (cfm) of soil vapor from the <br /> following wells VSB3 , VSB5, VS39 , VSB11, and MW5 As of August <br /> 20, 1993 system is removing 4 85 pounds per day of TFH <br /> hydrocarbons Because of heat build up the Blowers are not <br /> running constantly but are cycling, the poundage produce has been <br /> recalculated to reflect the cycling <br /> In order to gain a better understanding of the processes <br /> occurring at this site, we have began to test the vapor stream <br /> for carbon dioxide content From this added analysis we can <br /> estimate the amount of hydrocarbons destroyed at the site by <br /> subsurface biological and chemical oxidation, driven for the most <br /> part by the vapor extraction <br /> page 1 of R604 , 07/09/93 <br />