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VSd9n a ar <br /> y r l h ti <br /> r: <br /> Ultramar Inc, i.,,,, ,,, „f,:r .,.," <br /> di d L, <br /> .:'4 IFELENVIRONMENTAL PROJECTRLY STATUS REPORT <br /> DATE REPORT SUBMITTED: October 15, 1991 Vj <br /> QUARTER ENDING: June 30, 1991 <br /> OCT 1 9 €-M <br /> SERVICE STATION NO.: 492t, Manteca, California EWiP%1)tiiUr 'L H�r�,TAALTH <br /> ADDRESS: 470 N. Main StreePER�1lf SEi�ViCt= <br /> COUNTY: San Joaquin <br /> ULTRAHAR CONTACT: Kenneth R. Earnest <br /> TEL, N0: 209-583-5571 <br /> SACK�' <br /> pass <br /> The 10,000-gallon dnes1986. Theathreeetankseatdthe sid ite were <br /> excavation <br /> were <br /> testing <br /> uncovered and lied 7PHdS�nldetectablerconcentratlions, Three <br /> showed both TPM9 wells (MW-1, MW-2, MW-3) were <br /> ground-water monitoring t" <br /> installed at the svrerete aninstalled four dobetween ctthe three tanks. <br /> VW-5, VW-6, VW-7) <br /> 1/4-inch or less of separate-phase hydrocarbon was detected into <br /> one ground-water monitoring well (MW-1) <br /> 12/5/88, No separate-phase product was detected since 12/88during 9/6/88 • <br /> nal <br /> Vapor extraction remediation was performed wYWWhan 5, VW-6, and <br /> combustion engine utilizing MW-1 and 4W-4, total <br /> VW-7 as extraction points from 10/13/89 to 11/17/89e(equivalent <br /> of approximately 1950 pounds of hydrocarbon vapor ( a <br /> to approximately 315 gallons of gasoline) were extracted and <br /> abated. <br /> round-water monitoring wells are located in a <br /> The three 9 formation around the tank cluster with <br /> triangular <br /> other two wells. <br /> approximately 60 feet between MW-3 and the <br /> Ground-water gradient meafurementlat potentiometricrecordet tground-water <br /> consistently shown a fhave been <br /> surface. p BTE co nCeMCLst�snncen 12/89.wells MW-1MWn3 has 2shown BTEX <br /> at or <br /> near The three <br /> concentrations within Stwellste Mwere analyzed for TPNd in 9/90- <br /> ground-water monitoring <br /> All three wells showed nondetectable TPHd with a detection <br /> limit of 50.0 ppb. <br /> A,Quality and Service <br /> A Member of Ito Ultramar GrouP of Corr pia e= <br />