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Beacon Cardlock Station Number 610 SSB 92-1001-02 <br /> 3300 Waterloo Road Page 2 <br /> Stockton, California <br /> 2.0 BACKGROUND INFORMATION <br /> IPertinent information required to obtain an understanding of the project is presented in the <br /> following sections <br /> 2.1 Site Location <br /> The subject Beacon service station is located at 3300 Waterloo Road in Stockton, California The <br /> site location is shown on the Vicinity Map presented as Plate i The approximate locations of the <br /> station facilities are shown on the Site Plan presented as Plate 2 <br /> 2.2 Site Description <br /> The Beacon cardlock site consists of a structure, two dispenser islands under a canopy, paved traffic <br /> and parking areas, and three underground fuel storage tanks. Four 4-inch diameter monitoring <br /> wells were installed during March and April of 1987 The locations of the site facilities, including <br /> the monitoring wells, are shown on the site plan presented as Plate 2 <br /> 2.3 Regional Geologic Setting <br /> Stockton is located at the border of the Sacramento and San Joaquin Valleys in the central portion <br /> of California or the center of the central valley geomorphic province of California The valley in <br /> the area of Stockton is underlain by unconsolidated Holocene continentally derived young alluvium. <br /> The younger alluvium is underlain by unconsolidated older alluvium of Pleistocene and Holocene <br />' age Pliocene to Pleistocene deposits of continentally derived sand, silt, clays, and poorly sorted <br /> gravels underlie older alluvial deposits Regionally extensive clay bodies referred to as A through <br />' E clays are not believed to exist below the site Other confining layers of less than regional extent <br /> may underlie the site Marine sedimentary rocks yielding saline waters may underlie continental <br />' derived sedimentary rocks at depth The basement in the region is composed of meta-sedimentary <br /> and meta-volcanic rocks and occurs at a depth of approximately 15,000 feet below the Stockton <br />' area Structurally, the consolidated sediments have been folded into a west dipping homocline <br /> formed by the westward tilting of the Sierra Nevada structural block <br />' SSB ENVIRONMENTAL CONSULTANTS, INC <br />