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t <br /> '1 <br /> Yfa — 1 <br /> 67&' <br /> •�,�,a��ed Cseo.�ys�emS 4191-E Power Inn Road,Sacramento,CA 95826 (916)452.2901 <br /> • FREMONT O IRVINE •HOUSTON • BOSTON O SACRAMENTO •CULVER CITY a SAN JOSE <br /> June 30, 1989 <br /> 0327sepp <br /> AGS 86102-3 <br /> Mr. Steve Epperson <br /> Beacon Oil Company <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: Letter report on �'< <br /> quarterly ground-water monitoring f>)r <br /> 1st quarter, 1989, at Beacon Station No. 3-492, 470 <br /> North Main Street, Manteca, California. <br /> Mr. Epperson: <br /> At the request of Beacon oil Company (Beacon) , we have prepared <br /> this letter report summarizing the field methods and results of <br /> monthly subjective analyses and quarterly ground-water monitoring <br /> performed from December 1988through March 1989 at Beacon Station <br /> No. '3-492 in Manteca, California. The site is located at the <br /> southeast corner of the intersection of North Main Street and <br /> Alameda Street in Manteca, California, as depicted on the Site <br /> ?' Vicinity Map (Plate P-1) . The approximate configuration of the <br /> t' station facilities, including three underground product-storage <br /> tanks, is depicted on the Generalized Site Plan (Plate P-2) . <br /> Previous work at the site includes an initial Subsurface <br /> Environmental Investigation (Applied GeoSystems, Report No. <br /> 86102-1, December 16, 1936) in response to a failed <br /> leak test of a 10,000-gallon _ precision <br /> investigation, three 4-inch-diameter grostorage tank. During the <br /> wells (MW-1 through MW-3) were installedat the esite,sianding <br /> selected soil and <br /> analyzed for hydrocarbonground-watercollected <br /> contaminants. The results ofathat <br /> investigation indicated that .soil in the vicinity of the tank <br /> cavity and ground water underlying the site had been affected by <br /> gasoline contamination. Subsequent to that investigation, <br /> Applied GeoSystems installed four vapor-extraction wells (VW-4 <br /> through VW-7 <br /> g } in the tank._cavity_backf'il-1---(Applied--Geosyst-- <br /> -- --- - <br /> - --- <br /> - __- -- - atter-Report No. ---.86102-3, October 13, 1988) : The i_cations of <br /> r " the ground-water monitoring wells and vapor-extraction <br /> } shown on Plate P-�2: walla are <br /> At the request of Beacon, Applied. GeoSystems began quarterly <br /> monitoring of ground water in ground-water monitoring wells MW-1 <br /> through MW-3 in May 2987, Because floating product was observed <br /> ,'w <br />