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-luo/led GenSysfems/nc <br /> i RESNA(-umpanv <br /> Environmental Solutions <br /> 10164 C,imO (rite ,urle 00 Through Applied Science, <br /> R,1+1( ho Cordo a CA 9W-0 Engineering&Construction <br /> Phone X916) <br /> June 15, 1992 <br /> Mr. Chuck Carmel <br /> ARCO Products Company <br /> P O Box 5811 �. <br /> r Fr <br /> San Mateo, California 94402 _� , L. Ut <br /> Subject: Vapor-Extraction Test Resuits,ARCO Service Station No 548, 1612 Hammer <br /> Lane, Stockton, California. <br /> Mr Carmel <br /> At the request of ARCO Products Companv, RESNA Industries (RESNA) has prepared this <br /> letter report summarizing the results ana conclusions of a vapor-extraction test (VET) <br /> performed at the subject site. The VET was completed in anticipation of treating the <br /> hydrocarbon-bearing soil beneath the site. The site location is shown on the Site Vicinity <br /> Map, Plate 1. <br /> VAPOR-EXTRACTION TEST <br /> On March 3, 1992, RESNA performed a VET onsite to collect site-specific data and <br /> evaluate the feasibility of vapor extraction as a remediation alternative for vadose zone soil <br /> and to select the most appropriate off-gas treatment alternative, if applicable. The VET <br /> equipment consisted of an internal combustion (I C ) engine, instrumentation for measuring <br /> air flowrate, air velocity, air pressure/temperature, and volatile organic compound <br /> concentrations, and polyvinyl chloride piping and fittings for the wellhead connections. <br /> Wells VW-1, VW-2, VW-3, MW-1, and NNW-2 were used dunng the VET The I C. engine <br /> was initially operated for approximately 1-4 minutes on well VW-2 to collect an influent soil <br /> vapor sample. This procedure was then repeated on well VW-1 for 15 minutes. The I C. <br /> engine was then operated for approximately 5-1/2 hours on vapor-extraction well VW-3 <br /> while the vacuum influence of wells VW-1, VW-2, MW-1, and MW-2 were observed. While <br /> well VW-3 was used as the extraction well, flowrates of approximately 29 and 74 cubic feet <br /> per minute (cfm) were achieved and four influent and one effluent vapor samples were <br /> 0413ccar <br /> 30004-5 <br />