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i+ /App//ed Geo,S-Wems 4191-E Pmyr I n Rnari,Sacrtmunlu, CA 95826 (916)452-2901 <br /> a FREMONT a IRVINE a HOUSTON a BOSTON C SACRAMENTO a CULVER CITY a SAN JOSE <br /> r'+ <br /> June 1, 1989. <br /> 0407tros <br /> AGS 38012--2 <br /> Mr. Tim Ross <br /> UNOCAL Corporation <br /> 2175 North California Boulevard <br /> Suite 650 <br /> Walnut Creek, California 94596 <br /> Subject: Letter report of quarterly ground-water monitoring at <br /> former UNOCAL Service Station No. 2859, 1665 Pacific <br /> Avenue, Stockton, California. <br /> Mr. Ross: <br /> This letter report summarizes the results of the quarterly <br /> ground-water monitoring program that Applied GeoSystems is <br /> conducting at former UNOCAL Station No. 2859 in Stockton, <br /> California. The property is located on the southwest corner of <br /> the intersection of Pacific Avenue and Walnut Street, as shown on <br /> the Site Vicinity Map (Plate P-1) . Work at the site included <br /> measuring depths to water and subjectively analyzing ground water <br /> in monitoring wells MW-1 through MW-3, purging and sampling <br /> ground water from these monitoring wells for laboratory analysis, <br /> and evaluating the ground-Nater gradient at the site. The <br /> locations of the monitoring wells are shown on the Generalized <br /> Site Plan (Plate P-2) . <br /> During a previous phase of work in May and June 1988, Applied <br /> GeoSystems installed three 2-inch-inner-diameter ground-water <br /> monitoring wells at the site (monitoring wells MW-1 through <br /> MW-3) . Gasoline hydrocarbon constituents were nct detected in a <br /> ground-water sample collected from monitoring well MW-1. <br /> Ground-water samples collected from monitoring wells MW-2 and <br /> MW-3 contained detectable concentrations of gasoline <br /> hydrocarbons. The results of that phase of our ongoing <br /> subsurface environmental investigation were reported in AGS <br /> Report No. 38012-2 (July 28, 1988) . <br /> ---On-October-26, 1988,- with-the authorization-of-UNOCAL <br /> GeoSystems collected ground-water samples from monitoring wells <br /> MW-1 through MW-3. Laboratory analyses indicated that total <br /> petroleum hydrocarbons (TPH) as gasoline and benzene, .toluene, <br /> ethylbenzene, and total xylene isomers (BTEX) remained <br />