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a � r' Eff I F Suit Data Drive Delta Rancho 100 Rancho Cor[fova CA 95670 . Envi 14 N 7 *M" 9161638 2085 Consultants,Inc. FAX 9161638-8385 January 20, 1993 Mr Kenneth Earnest Ultramar Inc 525 West Third Street Hanford, California 93230 Subject, Quarterly Soil Vapor Extraction Report Beacon Station No 696 800 Highway 12 Lodi, California Delta Project No 40-90-839 Dear Mr Earnest Delta Environmental Consultants, Inc (Delta), has been authorized by UItramar Inc, to operate a soil vapor extraction system at the subject site (Figures 1 and 2) The purpose of the system is to remediate gasoline-impacted soils underlying the site Petroleum vapors in the soils are vented through ten soil vapor extraction wells (MW-2, MW-5, MW-7, MW-10, MW-19, MW-20, MW-24, MW-28, MW-34, and MW-35) Locations of the soil vapor extraction wells are shown on Figure 2 Evax Technologies, Inc , began operation of the soil vapor extraction system utilizing a 100 standard cubic feet per minute catalytic oxidizer on site in August 1991 On September 21, 1992, Delta was authorized to remove the existing catalytic oxidizer and install two 2,000-pound vapor phase granular activated carbon columns in series as the abatement device for the soil vapor extraction system. The soil vapor extraction system flow diagram is presented in Figure 3 and the system detail is illustrated in Figure 4 During catalytic operation it has been estimated that approximately 9,094 pounds of hydrocarbons and 24 pounds of benzene were removed from soils underlying the site Operational data collected prior to September 21, 1992, has been presented in Evax Technologies, Inc , "Soil Vapor Extraction Quarterly Monitoring Reports" The purpose of this letter is to present operational data for the fourth quarter 1992 Enclosure A presents tabulated calculations pertaining to extraction and emission rates Delta Delivers Solutions