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r ti. <br /> �7�7IjE�[� raL�0.Sj/StBl11S �T~�_—flsri-3. C'us�rr Inn Ku,uf, tidsr,ur�rnEu. {'i°irh_[, r'IIi,E .1�,::'�s)I <br /> MAN <br /> «n _ <br /> • rtir • COST,% ,MfSA • „ACIZ,VN!FN"F(l • 1R)t6TON <br /> an <br /> January 13, 1989 <br /> 1115tros <br /> AGS 58012-2 <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 r <br /> ground-water monitoring program that Applied GeoSystems is <br /> conducting at former UNOCAL Station No. 2859 in Stockton. The <br /> property is located on the southwest corner of the intersection <br /> of Pacific Avenue and Walnut Street. The location of the site is <br /> shown on the site Vicinity Map (Plate P-1) . Work at the site <br /> included measuring depths to water and subjectively analyzing <br /> ground water in monitoring wells MW-1 through MW-3, purging and <br /> sampling ground water from these monitoring wells for laboratory <br /> analysis, and calculating the ground-water gradient at the site. <br /> The locations of the monitoring wells are shown on the <br /> Generalized Site Plan (Plate P-2) . <br /> During a previous phase of work in May and June 1788, Applied <br /> *a GeoSystems instal_ad three 2-inch-inner-diameter ground-water <br /> monitoring wells at the site. The results of that phase of oui <br /> ongoing subsurface environmental investigation were reported in <br /> AGS Report No. 38012-2 (dated July 28, 1988) . <br /> At your request, a geologist from Applied GeoSystems was present <br /> onsite October 26, 1988, to collect ground-water samples from the <br /> wells. The depth to the ground-water surface in each monitoring <br /> well was measured to the nearest 0.01-foot with a Solinst water- <br /> level indicator. The ground water was found to be approximately <br /> 4 feet deeper in the recent sampling event than previously <br /> measured. The water-level data, summarized in Table 1, were used <br /> to construct a Ground-Water Potentiometric Surface. Map across the <br /> site (Plate P-3) . <br />