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117tel 71otione+l Incol porelletl <br /> May 27, 1998 <br /> Project 7GO05-001-01 <br /> Ms Anastasia Duarte-Wilkinson <br /> Time Oil Company <br /> Property No 04-049 <br /> 2737 Commodore Way <br /> Seattle, Washington 98199 <br /> Re Vapor Extraction Feasibility Testing <br /> Time Oil Service Station <br /> 14000 East Highway 88 <br /> Lockeford, CA 96021 <br /> Dear Ms Wilkinson <br /> iThe letter presents the results of the soil vapor extraction (SVE) feasibility testing performed <br /> by SECOR International Incorporated (SECOR) at the site referenced above The objective <br /> of the in-situ SVE feasibility test was to measure the induced flow rate and estimate the area <br /> of influence created by vapor extraction from eight representative SVE wells The above <br /> parameters were used to determine the feasibility of SVE as an applicable technology for <br /> remediation and may be used to facilitate the design of a SVE treatment system <br /> Testing ]Procedures <br /> SVE testing was performed at the site on March 19 and 20, 1998 Eight separate SVE tests <br /> were performed using existing vapor extraction wells W-1, W-2, W-3, W-4, W-5, W-6, W-7, <br /> and W-8 Based on the proximity to the testing well and the screen interval, seven existing <br /> monitoring wells were used as influence monitoring points for each well tested <br /> Tests were performed by connecting the intake side of a Vaclean 1000 Internal Combustion <br /> Engine (ICE) to each SVE well used Vacuum gauges were placed at each monitoring point <br /> well head in order to monitor the negative pressure gradient induced by each respective vapor <br /> extraction well Induced vacuum influence in surrounding monitoring wells were observed <br /> and recorded throughout each test (Tables 1 through 8) The duration of each SVE test varied <br /> from approximately 1 to 4 hours <br /> 9912 Business Park Drive, Suite 100, Sacramento, CA 95827 (916) 364-1880(916) 364-1889 FAX uww secor com <br />