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RECEIVED <br /> MAY 2 2 1992 <br /> ENVIRONMENTAL HEALTH APR 0 2 1992 <br /> PERMIT/SLRVICES <br /> WSYSTEMS,INC -- <br /> 269 Aft Hermon Rd <br /> surte 101 <br /> Scotts valley,CA 95066 <br /> (408)438 7511 <br /> FAX(408)438 7515 <br /> 30 March 1992 <br /> Mr. Kenneth Earnest FAX (209) 583-3282 <br /> Ultramar, Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> SUBJECT: ULTRAMAR STATION #69S <br /> Soil Vapor Extraction System Monitoring Data <br /> 100 SCFM Catalytic Incinerator <br /> 800 Highway 12 <br /> Lodi , California <br /> Dear Mr. Earnest: <br /> The vapor extraction system at the above site was monitored on 11, 19 <br /> and 24 March 1992. The results are presented in the attached tables <br /> for your review. Also attached are copies of chromatograms of the <br /> influent and effluent air streams and a site plan showing the layout of <br /> the vapor extraction system. <br /> The system operated continuously from the previous monitoring on 25 <br /> February to 11 March. The hours of operation have been tracked by both <br /> an hours meter and the continuously recording influent and effluent LEL <br /> monitor. <br /> On 11 March the system and extraction wells were completely monitored. <br /> Hydrocarbon concentrations at the individual wells and the total system <br /> declined significantly from the previous monitoring. Extraction well <br /> MW-2 was closed due to low concentrations. With the closing of MW-2, <br /> only 3 of the system's 10 extraction wells remained open. Extraction <br /> wells MW-20 and MW-28 continued to remain open for migration control . <br /> On 11 March, the system influent total declined to about 1374 ppm even <br /> though ambient dilution was completely closed on that date. With the <br /> complete closure of ambient dilution and only 3 extraction wells open, <br /> the vacuum was raised to nearly 7" Hg; the highest recorded during the <br /> entire program. The hydrocarbon mass removal rate on 11 March was <br /> approximately 24 pounds per day. The influent chromatogram for 11 <br /> March again reflects a weathered gasoline distribution with benzene <br /> less than 1 ppm and total xylenes in excess of 350 ppm. <br /> A special site visit was made on 19 March 1992 to open extraction wells <br /> MW-24 and MW-35. These adjustments were made at the request of <br />