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Monitoring Well Installation Work Plan FAST AND EASY MART 244 West Harding Way, Stockton, California 1.0. INTRODUCTI:;ON At the request of Mr. Mike Ali, the property owner,Advanced Geo Environmental, Inc. (AGE) has prepared the enclosed Monitoring Well Installation Work Plan for the property located at 244 West Harding Way, Stockton, California. The location of the site is illustrated on Figure I and a plan of the site is illustrated on Figure 2. This Work Plan is prepared as directed in verbal discussions with the San Joaquin. County Environmental Health Department (EHD), and is in accordance with the Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the subsurface investigation of UST sites. 2.0. BACKGROUND The site is bounded by Harding Way on the north, residential properties to the south and west, and commercial properties to the cast. A gasoline station and mini-mart presently occupy the site_ Two USTs were removed from the site in September 1998 by Stockton Service Station Equipment (SSSE), and a new UST system was installed in December 1998. 2.1 . R.EGiONAL GEOLOG[C/HYDROGEOLOGIC CONDITIONS The site is situated within the Great Valley Geomorphic Province of California, a large, elongate northwest tending, asymmetric structural trough. The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to recent, creating a nearly flat lying alluvial plain,which extends from the"Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be of metamorphic and igneous origin. The Great Valley Province has been subdivided into two major divisions identified as the Sacramento and San Joaquin.Valleys. 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). This basin is drained.primarily by the San Joaquin River. The closest surface water feature to the site is Smith Canal and Yosemite Lake, located approximately 1,500 feet northwest of the site. Water from Smith Canal drains into the San Joaquin River Deep Water Chatiricl and is primarily used for commercial and recreational boating. Advanced GeoF nviran mental,Inc.