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QUARTERLY REPORT <br /> October 1993 <br /> Marlowe Properties <br /> 4648 East Waterloo Road <br /> Stockton, California <br /> 1. 0 INTRODUCTION <br /> IAt the direction of Mr. Jonathan Marlowe of Marlowe Properties, <br /> Geological Audit Services, Inc. (GeoAudi.t� has prepared this <br /> quarterly report of monitoring well installation and sampling <br /> activities at 4548 East Waterloo Road, Stockton, California (the <br /> site) . This report describes the installation and sampling <br /> procedures and presents the results of laboratory analyses. <br /> 2 . 0 BACKGROUND <br /> 2 . 1 Site Location <br /> The site is located .in a flat industrial area east of Stockton, <br /> California (Figure 1) . A large warehouse, a small office building, <br /> two fenced storage yards and a parking/delivery area are present on <br /> the site (Figure 2) . The office is currently vacant; the warehouse <br /> is occupied by C. V. Sports <br /> 2 .2 Hydrogeologic Setting <br /> The site is underlain by the Modesto and Riverbank formations <br /> (previously mapped as the upper and lower members of the Victor <br /> Formation) These formations consist of a few hundred feet of <br /> unconsolidated sand and weakly consolidated silt, derived from <br /> erosion of granitic and metamorphic rocks in the Sierra Nevada and <br /> deposited in fluvial channel and floodplain environments. These <br /> deposits have high porosity and permeability and form the primary <br /> aquifers for domestic, municipal, and agricultural use in San <br /> Joaquin County. <br /> Regional groundwater flow within these aquifers is westward or <br /> southwestward from recharge areas in the eastern part of the county <br /> to the discharge area of the Sacramento-San Joaquin delta. Local <br /> groundwater pumping, primarily for agricultural purposes, reverses <br /> this pattern in several areas, forming circular or elliptical <br /> groundwater depressions that are several square miles in extent. <br /> The Marlowe Properties site is located within one such depression, <br /> two miles west of its center (San Joaquin County Department of <br /> Public Works, Flood Control Section, 1990) . Hence, according to the <br /> DPW 1990 maps of groundwater depth and elevation, the depth to <br /> first groundwater in the area of the site was approximately 95 <br /> feet, and flow was to the east or northeast. <br /> 1 <br />