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Nw SITE BACKGROUND INFORMATION Former STEFANO'S GAS STATION 1419 East Charter Way, Stockton, California The site is located at 1419 East Charter Way, Stockton, California. The site was formerly utilized as a gasoline service station and is currently a vacant lot with low topographic relief It is bounded by Sierra Nevada Street to the west and East Charter Way to the south. REGIONAL GEOLOGICAL/HYDROGEOLOGICAL SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of California: a large,elongate,northwest trending,asymmetric structural trough; the Sacramento and San Joaquin Valleys comprise the northern and southern portions of the Province. The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east. The Great Valley has been filled with sediments derived from both marine and continental sources. Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet in the south central portion of the valley. The sedimentary formations range in age from Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits being primarily continental. Continental-derived sediments were primarily deposited in lacustrine, fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the valley; the site itself is located on unconsolidated and semi-consolidated alluvium, lake,playa and terrace deposits of Quaternary age. Rocks composing the basement complex of the Province have not been completely defined but are believed to be metamorphic and igneous in origin. The Modesto, Riverbank and Turlock Lake Formations and overlying recent alluvium are the principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin(Basin 5-22).Based on information from quarterly monitoring events performed at the site, the depth to ground water on-site is approximately 40 to 45 feet below surface grade (bsg). Ground water generally flows towards the south to southeast. GROUND WATER DEPTH AND FLOW DIRECTION Ground water is currently encountered at a depth of approximately 40 feet bsg in on-site ground water monitoring wells; the flow direction is generally towards the south to southeast.Historically, the depths to ground water measured in the on-site monitoring wells and soil borings have ranged from approximately 39 to 46 feet bsg; relative ground water elevation maps for the site have been included in previous quarterly reports prepared by Wright Enviromnental Services, Incorporated (WES) and AGE. Advanced GeoEnvironmental,Inc.