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L RECEIVE ® DEC211995 3164 Gold Camp Drive aelt Suite 200 IM& Rancho Cordova CA 95670 Environmen#al 916!638-2085 Consultants,Inc FAX 9161638 8385 December 18, 1995 Mr Kenneth Earnest Ultramar Inc 525 West Third Street Hanford, California 93230 Subject Quarterly Soil Vapor Emraction Report, September 20, through December 6, 1995 Beacon Station No 695 900 South Cherokee Lane Lodi, California Delta Project 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 September 20,through December 6, 1995. All system operation data has been provided to Delta by Ultramar and Western States Instrumentation Western States Instrumentation(Western) 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 on October 4, and 18, November 3, and 20, and December 6, 1995. During this period, the SVE system had operated for approximately 1,845 hours (--77 days) out of 1,848 hours (-77 days) Table 1 presents the cumulative hours of system operation through December 6, 1995 Based on field instrument readings, it is estimated that 2,915 pounds (lbs ) (478 gallons) of vapor equivalent gasoline were removed from soil underlying the site during the reporting period As of December 6, 1995, the SVE system had extracted approximately 48,104 lbs (7,796 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 October 18 and November 20, 1995, and submitted to Western Environmental Science and Technology (a California-certified laboratory) for analysis of benzene, toluene, ethylbenzene, total xylenes, (BTEK)and total petroleum hydrocarbons(I'PH) as gasoline. Table 1 presents the benzene and TPR 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