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Data 3330 100 Oak'M Drwe Suite 400 o Cordova CA 95670 916/6 Environmental 916163$2085 Consultants,Inc FAX 9161638 8385 July 5, 1994 REC EWER J U L 1 1 1994 Mr Kenneth Earnest Ultramar Inc 525 West Third Street Hanford, California 93230 Subject Quarterly Soil Vapor Extraction Report, Second Quarter 1994 Beacon Station No 695 900 South Cherokee Lane Lodi, California Delta Project No D093-915 tr- . Dear Mr Earnest Delta Environmental Consultants, Inc (Delta), has been authorized by Ultramar 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 12 nested soil vapor extraction 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 soil vapor extraction wells are shown on Figure 2 Evax Technologies, Inc , began operation of the soil vapor extraction system, utilizing a 500 standard cubic feet per minute catalytic oxidizer at the site in July 1991 Delta was authorized to conduct operation and maintenance of the system in May 1993 Following underground storage tank excavation and replacement in January 1994, additional soil vapor extraction wells were added to the remediation system The soil vapor extraction system was restarted by Delta on May 1, 1994 The remediation system location is illustrated in Figure 3 During the second quarter of 1994, it is estimated that 2,988 pounds (lbs ) of hydrocarbons were removed from soils underlying the site Since the system began operating in May 1993, approximately 27,136 lbs of hydrocarbons have been removed from soils underlying the site A summary of extraction and emission rates since May 1993 are presented in Enclosure A Delta Delivers Solutions