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I S iMonitoring Well Installation & Quarterly Report-- First Quarter 2003 ' 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 quarterly report for the property located at 2450 South EI Dorado Street, Stockton,California(the site) This report documents procedures and results for the Installation and ' development of three ground water monitoring wells and quarterly ground water monitoring for the first quarter of 2003 The site and the surrounding area are illustrated in Figure 1 On-site structures and well locations are Illustrated on Figure 2 I 2.0. BACKGROUND IThe subject property is located on 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 and commercial The Subject site is the former location of a glass production facility,originally decommissioned sometime during the I • early 19705 2 1 REGIONAL GEOLOGIC SETTING I The property is situated within the Great Valley Geomorphic Province of California, a large, I 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 I 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 denved from mixed rock sources The Modesto,Riverbank,Turlock Lake Formations and• overlying recent alluvium are the principal Ymg sources of domestic ground water in the 13,500-square-mile San Joaquin Valley Ground Water Advanced GeoEnvironmental,Inc