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b <br /> U.ViRQN;-1E,i RL HLA1_T11 :{pj� <br /> PF RIAI c�-RVICE r SEPVi eAf llt 3330 Data Drive <br /> Delta �` �1�� `� , k �� y� <br /> Rancho Cordova CA 95670 <br /> ni <br /> 38-2085 <br /> Consui fn ts,Inc �� �U FAX 9161638 <br /> Cansuitants,iFAX 916!638-8385 <br /> January 18, 1995 <br /> Mr Kenneth Earnest <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject- Quarterly Soil Vapor Extraction Report, Fourth Quarter 1994 <br /> Beacon Station No 695 <br /> 900 South Cherokee Lane <br /> Lodi, California <br /> Delta Project No D093-915 <br /> Dear Mr Earnest <br /> Delta Environmental Consultants, Inc (Delta), has been authotmed by Ultramar Inc to operate a soil <br /> vapor extraction system at the above-referenced site (Figures 1 and 2) The purpose of the system <br /> is to remediate gasoline-impacted soils underlying the site. Petroleum vapors in the soils are vented <br /> through 12 nested soil vapor extraction wells (VEW-1 through VEW-12), two recovery wells (RW-1 <br /> and RW-2), and 16 monitoring wells (MW-1, MW-3, MW-4, MW-6, MW-8 through MW-10, <br /> MW-15 through MW-17, MW-22, and MW-26 through MW-30) Locations of the soil vapor <br /> extraction wells are shown on Figure 2 <br /> Evax Technologies, Inc , began operation of the soil vapor extraction system utilizing a 500 standard <br /> cubic feet per minute catalytic oxidizer at the site in July 1991 Delta was authorized to conduct <br /> operation and maintenance of the system in May 1993 Following underground storage tank <br /> excavation and replacement in January 1994, additional soil vapor extraction wells were added to the <br /> remediation system The soil vapor extraction system was restarted by Delta on May 1, 1994 The <br /> remediation system location is illustrated in Figure 3. <br /> During the fourth quarter of 1994 (October 3 through December 27, 1994), it is estimated that <br /> 4,599 pounds (lbs ) (745 gallons) of total petroleum hydrocarbons (TPH) as gasoline were removed <br /> from soils underlying the site As of December 27, 1994, the soil vapor extraction system has <br /> extracted approximately 32,813 lbs (6,060 gallons)of TPH as gasoline from soils underlying the site <br /> A summary of extraction and emission rates since May 1993 are presented in Enclosure A <br /> Providing a Cornoetitive Edge <br />