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Monitoring Well Installation Work Plan Proposed EL DORADO APARTMENTS 2450 South EI Dorado Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Bob Park of ParkCrest Development, Advanced GeoEnvironmental, Inc. (AGE), has prepared this Monitoring Well Installation Work Plan documenting procedures for advancement of soil borings and installation of ground water monitoring wells at 2450 South El Dorado Street, Stockton,California(site).The site setting is illustrated in Figure 1. The layout of the property and location of the proposed excavation and monitoring wells are depicted in Figure 2. This work plan was prepared to expedite the closure process for the site and was prepared in accordance with guidelines established by the Central Valley Regional Water Quality Control Board (CVRWQCB) for the subsurface investigation of underground storage tank (UST) sites. 2.0. BACKGROUND The subject property is located in the south-central portion of the City of Stockton, San Joaquin County, north of the intersection of South El Dorado Street and California Street. Land use of the surrounding properties is recreational (McKinley Park),residential andcommercial.The subject site is the former location of a glass production facility,originally decommissioned sometime during the early 1970s. 2.1. REGIONAL GEOLOGIC SETTING The property is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, 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,extending 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 metamorphic and igneous in origin. The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively. Based on the General Soil Map from the San Joaquin County Soil Survey, published by the United States Department of Agriculture Soil Conservation Service in 1992, the site area is within the Jackson-Hallenbeck-Stockton (JHS) association. The JHS soils are located within basins, and generally consist of moderate to poorly drained fine textured soils. The soils are generally derived from both marine and non-marine sediment, and are generally formed in alluvium derived from mixed rock sources. Advanced GeoEnvironmental,Inc.