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RECEIVED 0 C T 1 6 9995 3164 Gold Camp Drive Delta Suite 200 EnviRancho Cc dova CA 95670 ronmen#al 916/638-20B5 Consultants,Inc FAX 916 638 8385 October 13, 1995 Mr Kenneth Earnest Ultramar Inc 525 West Third Street Hanford, California 93230 Subject Quarterly Soil Vapor Extraction Report, July 5 through September 20, 2995 Beacon Station No 695 900 South Cherokee Lane Lodi, California Delta Protect No D093-915 Dear Mr Earnest Delta Environmental Consultants, Inc (Delta), has been authorized by Ultramar Inc (Ultramar) to report operation and maintenance data for the soil vapor extraction (SVE) system located at the above-referenced site(Figures 1 and 2) This report presents operation and maintenance data for the SVE system reporting period of July 5 through September 20, 1995 All system operation data has been provided to Delta by Ultramar and Western States Instrumentation Western States Instrumentation currently provides the SVE system operation and maintenance service for Ultramar at the subject site Petroleum vapors in the soil are vented through 12 nested SVE wells (VEW-1 through VEW-12), two recovery wells (RW-1 and RW-2), and 16 monitoring wells (MW-1, MW-3, MW-4, MW-6, MW-8 through MW-10, MW-15 through MW-17, MW-22, and MW 26 through MW-30) Figure 2 presents the locations of the SVE wells Figure 3 presents the location of the remediation system During the reporting period, system operation and maintenance site visits were performed by Western States Instrumentation on July 5 and 18, August 3 and 17, and September 1 and 20, 1995 During this period, the SVE system had operated for approximately 1,672 hours (--70 days) out of 1,848 hours (--77 days) Table 1 presents the cumulative hours of system operation through September 20, 1995 Based on field instrument readings, it is estimated that 2,292 pounds (lbs ) (371 gallons) of vapor equivalent gasoline were removed from soil underlying the site during the reporting period As of September 20, 1995, the SVE system had extracted approximately 45,189 lbs (7,319 gallons) of vapor equivalent gasoline from soil underlying the site In an effort to verify field instrument readings, influent and effluent soil vapor samples were collected on July 18, August 17, and September 20, 1995, and submitted to Western Environmental Science and Technology (a California- certified laboratory) for analysis of benzene, toluene, ethylbenzene, total xylenes, and TPH as gasoline Table 1 presents the benzene and TPH as gasoline analytical results and a summary of petroleum hydrocarbon extraction and emission rates Example TPH as gasoline extraction and emission rate calculations are included in Enclosure A Copies of the analytical reports are included in Enclosure B Providing a Competitive Edge