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<br /> P1,11E
<br /> 3164 Gold Camp Drive
<br /> Suite 200
<br /> Delta UG _d, PM 1: 33 Rancho Cordova,CA 95670
<br /> IR& Environmental 9161638-2085
<br /> Consultants,Inc FAX 9161638 8385
<br /> July 24, 1995
<br /> Mr Kenneth Earnest
<br /> Ultramar Inc
<br /> 525 West Third Street
<br /> Hanford, California 93230
<br /> Subject Quarterly Soil Vapor Evraction Report, March 22, through July 6, 1995
<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 authorized by Ultramar Inc (Ultramar) to
<br /> report operation and maintenance data for the soil vapor extraction (SVE) system located at the
<br /> above-referenced site(Figures 1 and 2) This report presents operation and maintenance data for the
<br /> SVE system reporting period of March 22, through July 6, 1995 All system operation data has been
<br /> provided to Delta by Ultramar and Western States Instrumentation Western States Instrumentation
<br /> currently provides the SVE system operation and maintenance service for Ultramar at the subject site
<br /> Petroleum vapors in the soil are vented through 12 nested SVE wells(VEW-1 through VEW-12), two
<br /> recovery wells (RW-1 and RW-2), and 16 monitoring wells (MW-1, MW-3, MW-4, MW-6, MW-8
<br /> through MW-10, MW-15 through MW-17, MW-22, and MW-26 through MW-30) Figure 2
<br /> presents the locations of the SVE wells Figure 3 presents the location of the remediation system
<br /> During the reporting period, normal system operation and maintenance site visits were performed by
<br /> Western States Instrumentation on April 4 and 20, May 2 and 17, June 1 and 20, and July 6, 1995
<br /> During this period, the SVE system had operated for approximately 1,908 hours (—80 days) out of
<br /> 2,544 hours (-- 106 days) Table 1 presents the cumulative hours of system operation through
<br /> July 6, 1995
<br /> Based on field instrument readings, it is estimated that 4,469 pounds (lbs ) (724 gallons) of total
<br /> petroleum hydrocarbons (TPH) as gasoline were removed from soils underlying the site during the
<br /> reporting period As of July 6, 1995, the SVE system had extracted approximately 42,897 lbs
<br /> (6,948 gallons) of TPH as gasoline from soil underlying the site In an effort to verify field
<br /> instrument readings, influent and effluent soil vapor samples were collected on May 17 and
<br /> June 1, 1995, and submitted to a California-certified laboratory to be analyzed for benzene, toluene,
<br /> ethylbenzene, total xylenes, and TPH as gasoline Table 1 presents the benzene and TPH as gasoline
<br /> analytical results and a summary of petroleum hydrocarbon extraction and emission rates Example
<br /> TPH as gasoline extraction and emission rate calculations are included in Enclosure A Copies of the
<br /> analytical reports are included in Enclosure B
<br /> Providing a Competitive Edge
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