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APR 19 1996 3164 Gold Camp drive Delta Suite 200 Rancho Cordova CA 95670 1/ Environmental 916/638 2085 Consultants,Inc FAX 916/638 8385 April 16, 1996 Mr Kenneth Earnest Ultramar Inc 525 West Third Street Hanford, California 93230 Subject Quarterly Soil Vapor Extraction Report, December 6, 1995 through February 20, 1996 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 December 6, 1995 through February 20, 1996 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 The soil vapors are abated by a 500 cubic feet per minute EVAX catalytic oxidizer prior to atmospheric discharge Figure 3 presents the location of the remediation system During the reporting period, system operation and maintenance site visits were performed by Western on December 6 and 20, 1995, January 4 and 17, and February 6 and 20, 1996 During this period, the SVE system had operated for approximately 1,028 hours (-43 days) out of 1,824 hours (--76 days) Table 1 presents the cumulative hours of system operation through February 20, 1996 Based on field instrument readings, it is estimated that 537 pounds (lbs ) (88 gallons) of vapor equivalent gasoline were removed from soil underlying the site during the reporting period As of February 20, 1996, the SVE system had extracted approximately 48,641 lbs (7,974 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 December 6, 1995 and January 4 and 17, 1996 The samples were submitted to Western Environmental Science and Technology (a California-certified laboratory) for analysis of benzene, toluene, ethylbenzene, total xylenes, (BTEX) and total petroleum hydrocarbons (TPH) as gasoline Table 1 presents the benzene and TPH as gasoline analytical results and a summary of petroleum hydrocarbon extraction and Providing a Competitive Edge 1