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RECEIVED <br /> J U N 16 1992 <br /> IRONMNTAL <br /> Ultramar ENV <br /> VPERMIT SERVICES`TFi <br /> Ultramar Inc. Telecopy: 209-584-6113 Credit&Wholesale <br /> P.O.Box 466 209-583-3330 Administrative <br /> 525 W.Third Street 209-583-3302 Information Services <br /> Hanford,CA 93232-0466 209-583-3358 Accounting <br /> (209)582-0241 <br /> ENVIRONMENTAL PROJECT <br /> QUARTERLY STATUS REPORT <br /> DATE REPORT SUBMITTED: June 12, 1992 <br /> QUARTER ENDING: March 31, 1991 <br /> SERVICE STATION NO. : 492 <br /> ADDRESS: 470 N. Main Street, Manteca, California <br /> COUNTY: San Joaquin <br /> ULTRAMAR CONTACT: Kenneth R. Earnest TEL. NO: 209-583-5571 <br /> BACKGROUND: <br /> The 10,000-gallon diesel tank at the site did not pass <br /> precision testing in 1986. The three tanks at the site were <br /> uncovered and lined. Soil samples from the tank excavation <br /> showed both TPHg and TPHd in detectable concentrations. Three <br /> ground-water monitoring wells (MW-1, MW-2, MW-3) were <br /> installed at the site and four vapor extraction wells (VW-4, <br /> VW-5, VW-6, VW-7) were installed between the three tanks. <br /> 1/4-inch or less of separate-phase hydrocarbon was detected in <br /> one ground-water monitoring well (MW-1) during 9/6/88 to <br /> 12/5/88. No separate-phase product was detected since 12/88. <br /> Vapor extraction remediation was performed with an internal <br /> combustion engine utilizing MW-1 and VW-4, VW-5, VW-6, and <br /> VW-7 as extraction points from 10/13/89 to 11/17/89. A total <br /> of approximately 1,950 pounds of hydrocarbon vapor (equivalent <br /> to approximately 315 gallons of gasoline) were extracted and <br /> abated. <br /> The three ground-water monitoring wells are located in a <br /> triangular formation around the tank cluster with <br /> approximately 60 feet between MW-3 and the other two wells. <br /> Ground-water gradient measurements recorded at the site have <br /> consistently shown a flat potentiometric. ground-water <br /> surface. BTEX concentrations in wells MW-1 and MW-2 have been <br /> at or near State MCLs since 12/89. MW-3 has shown BTEX <br /> concentrations within State MCLs since 9/88. The three <br /> ground-water monitoring wells were analyzed for TPHd in 9/90. <br /> All three wells showed nondetectable TPHd with a detection <br /> limit of 50.0 ppb. <br /> BEACON <br /> A Member of the Ultramar Group of Companies #1 Quality and Service <br />