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3 � �""°+ � s � •{.s ��� ,s. ..it '� �� � �, n., �, <br /> Applied aeoSystely7s 4191-E Power Inn Raid, Sacramento, CA 95826 (916)452-2701 <br /> + FREMONT • IRVINE a HOUSTON + BOSTON •SACRAMENTO • CULVER CITY e SAN JOSE <br /> } <br /> December 5, 1989 <br /> AGS 87050-3 <br /> Mr. Charles Buri! <br /> USA Petroleum Corporation <br /> 1261 East Ninth St <br /> Pomona, California 91766 <br /> l <br /> Subject: Executive Summary Of Problem Assessment Report on Soil and Ground- <br /> Water Contamination at USA Service Station No. 65, 2500 West Lodi <br /> Avenue, Lodi, California. <br /> e � <br /> Mr. Buril: <br /> x } At the request of USA Petroleum Corporation (USA), Applied GeoSystems is submitting <br /> this Problem'Assessment Report on soil and ground-water contamination to summarize the E <br /> a subsurface investigation at USA Service Station No. 65 at 2500 West Lodi Avenue in Lodi, <br /> California. Information provided by personnel of USA indicates threr: 12,000-gallon <br /> underground-storage tanks are used to store regular leaded, regular unleac ed, and super- . <br /> unleaded gasoline. it is our understanding from USA personnel that.precision tests <br /> f performed in 1987, 1983 and 1989 on the three underground tanks indicate the tanks tested <br /> fight. USA purchased the property in 1987. <br /> Hydrocarbon contamination was detected in <br /> the soil samples collected from twosoil <br /> borings. <br /> and water samples collected from two ground-water wells (S-1 and S-2) during a py-evious <br /> phase of investigation conducted at this site by the Pacific Environmental Group of Santa <br /> z Clara, California (Prelimina Environmental Inve-Riiiiation, March 16, 1987). In August <br /> 1987, at the request of USA, Applied GeoSystems drilled three 8-inch-diameter borings <br /> ` (B�1 throsigh R'3}, installed monitoring wells MtiV-1 through MW-3,and developed, purged E <br /> and sampled the wells (Applied G.:Systems, Delineation of Hydrocarbon Contamination ' <br /> and Hydrogeologic Characterization at !JSA Station No.65, 2500 West Lodi Avenue, Lodi, <br /> California. Report 87050-2, October 13, 1987). In August 1988, USA requested that we ' <br /> ___.sample.._the._ground__water-in-wells_MVI.A._through_MW.-3.._The-laboratory-results-of-this -- _. -:__.._ ....... <br /> - — sam t t ex tt are in.our Letter Report of4�4m�tedg��u'ttdt 4WatqmMpt�j i (Repuct, •- <br /> i I ; <br /> Laboratory results from these two sampling events indicated the presence of hydrocarbon <br /> contamination in the ground water. USA requested that Applied GeoSystems write a Work <br /> r'. Plan for two offsite wells (MW-4 and MW-S) to define the limits of water contamination <br /> , F <br /> min <br />