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RECEIVED MAY 0 8 1995 . 3330 Data Drive Delta Suite 100 Rancho Cordova,CA 95670 . Environmental � 9161636-2085 Consultants,Inc. d/�,►(� FAX 916/638-8385 April 27, 1995 F41 1 A�C•� '2J 'i� 9'9s t� Mr Kenneth Earnest sF �9�y Ultramar Inc 525 West Third Street -- Hanford, California 93230 Subject. Quarterly Soil Vapor Extraction Report, December 28, 1994 through March 22, 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 soil vapor extraction (SVE) data from an operating SVE system at the above-referenced site (Figures 1 and 2) The purpose of the system is to remediate hydrocarbon-impacted soil underlying the 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) Locations of the SVE wells are shown on Figure 2 Evax Technologies, Inc , began operation of the SVE system utilizing a 500 standard cubic feet per minute catalytic oxidizer at the site in July 1991 In May 1993, Delta was authorized by Ultramar to conduct operation and maintenance of the system Followmg underground storage tank excavation and replacement in January 1994, the system was turned off and additional SVE wells were added to the remediation system The SVE system was restarted by Delta on May 1, 1994 The remediation system location is illustrated in Figure 3 On January 1, 1995, Ultramar retained Western States Instrumentation to perform system operation and maintenance At Ultramar's request Delta continues to provide the quarterly remediation system status reporting utilizing the data that has been collected by Western States Instrumentation During the time period of December 28, 1994 through March 22, 1995, based on field instrument readings, it is estimated that 1,656 pounds (lbs )(267 gallons)of total petroleum hydrocarbons (TPH) as gasoline were removed from soils underlying the site As of March 22, 1995, the SVE system had extracted approximately 39,072 lbs (6,327 gallons)of TPH as gasoline from soil underlying the site In an effort to verify field instrument readings, an influent and effluent soil vapor sample was collected and submitted to a California-certified laboratory to be analyzed for benzene, toluene, ethylbenzene, total xylenes, and total petroleum hydrocarbons (TPH) as gasoline A copy of the analytical report is attached Table 1 presents the benzene and TPH as gasoline analytical results and a summary of petroleum hydrocarbon extraction and emission rates Providing a Competitive Edge