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' � ryW. <br /> ,Pll d rret.yyStoms 4191-E Power Inn Road, Sacramento, CA 95826 1916}452-2901 <br /> O FREMONT 0 COSTA MESA o SACRAMENTO a hOUSTON - <br /> October 13, 1988 <br /> 04].4SEPP <br /> AGS ,lob No. 86102-3 <br /> Mr. Steve. Epperson <br /> Beacon Oil Company <br /> 525 Third Street <br /> f Hanford, California 93230 <br /> Subject: Letter Rsport of installatior, of vapor-recovery wells at <br /> Beacon Station Nc , 3-492, 470 North Main Street, <br /> { <br /> Manteca, Califors.=a.. <br /> Mr. Epperson: <br /> A geologist from our office was present at the site refertAced . <br /> above on September 8, 1937 to drill four soil borings and install- <br /> vapor-recovery <br /> nstallvapor-recovery wells, The ;r-,rk was implemented a part of <br /> Applied GeoSystems' environmental investigatioa outlined in our <br /> Work Plan (AGS Report 86102-2, dated May 26,. 198.7) . r <br /> The site is located on the southnast...corner of the intarsection <br /> of North Main and Alameda Streets in Manteca, California. The <br /> _:. site Vicinity Map', Plate P-1, shows the.:iocation of the service <br /> station. Previous work indicated that soil immediately adjacent <br /> to and below the tank cavity is contaminated with hydrocarbons <br /> and that. groundwater contains volatile hydrocarbon constituents <br /> in excess of maximum levels for drinking water recommended by the <br /> California Department of Health Services (DHS) . <br /> ` Four vapor-recovery wells were installed. within the tank cavity. <br /> Y The Generalized Site Plan, Plate P-2, shows the location of the <br /> wells, which were installed in soil borings drilled by Datum <br /> Exploration,..Inc of Pittsburg, California using 8-inch-diameter, <br /> F cont4nuous: flight, hollow stem augers. The augers rere steam <br /> - - - <br /> -4- - cleaned--prior-to-use-in-each -Y..3le-to-minimize=the-:possibility--of,-- -- -.- - -- <br /> downhole or crosshole. contamination. The drilling was performed <br /> under the guidance .of a geologist registered by the Stat., of <br /> a,7 California wha .logged the .earth.materials in the borings as <br /> drilling proceeded: <br />