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LL <br /> P 6 <br /> 7 <br /> 09.S84 6117 CIO' d Who'as�E., <br /> -"`—�-- f f. L G 2995E13333Q AdmImNat <br /> sr:e <br /> Ultramar WIG. r I t rIIF•L)�'�i�.i�n'} 1 r._. 209583-37021n!omauo Euraces <br /> P D n, itf t r 1 Fpg 5a3'6356 <br /> i A courting <br /> §25 4'I Sn rtl <br /> U�ZIYIi f <br /> (2;iAr 6A2-02d! <br /> EHYIRONMENTAL PROJECT <br /> QUARTERLY STATUS REPORT <br /> DATE QUARTER ORT ENDING: : <br /> ENDING: March31i,n1991 1991 <br /> SERVICE STATION NO.: 492 <br /> ADDRESS: 470 N. Main Street, Manteca, California <br /> COUNTY: San Joaquin <br /> TEL. N0: 209-583-3374 <br /> ULTRAHAR CONTACT: Glenn R. Oembroff <br /> QACr K0��� i0 <br /> D� 000-gallon diesel tank at the site did not pass <br /> The , <br /> preciered testing <br /> ginedn 1986. The <br /> Soil three tanks <br /> theatankesite excavatere <br /> ion <br /> uncov <br /> showed both TPHg and TPHd in detectable concentrations. Twere <br /> ground-water monitoring wells (MW`1+ MW-2' VW-4, <br /> installed at the site and <br /> nstalledvapor <br /> betweenctthe three tanks. <br /> VW-5, VW-6, VW-7) were <br /> well (MW-1) during 9/6/88 to <br /> 1/4-inch or less of separate-phase hydrocarbon was detectedto <br /> one ground-water monitoring <br /> 12/5/88. No separate-phase product was detected since 12/88• <br /> Vapor extraction remediation was performed with an internal <br /> MW-1 and VW-4, VW-5, VW-6, and <br /> combustion engine utilizing uivalent <br /> VW-7 as extraction pcints from 1C/13/89 to 11/17/89• A tats} <br /> of approximate'.y 1950 pounds of hyaspline) wereextractedand <br /> to approximately 315 gallons of g ) <br /> abated. <br /> The three ground-water monitoring wells are located to a <br /> triangle formation around the tank cluster with approximately <br /> and the <br /> 60 feet betwls. Ground-water <br /> erements3 -water surface. BTE <br /> recorded oatethewsitelhave consistently <br /> s <br /> gradient mea <br /> shown a f}at potentiometric ground <br /> in wells MW-1 and MW-2 have been at or near <br /> concentrations <br /> State MCLs since 12/89. MW-3 has shown three <br /> conround-water <br /> within State MCLS since 9/88. The three 9/9All three <br /> limit of 50.0 <br /> monitoring wells were analyzed for TPHd 9n <br /> wells showed nondetectable TPHd with a detection limit <br /> ppb. <br /> BEACYA 91 <br /> -----�' „quulity and Service <br /> A Mernber cl the U1tt -nar Group of Compaa'•es <br />