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' Quarterly Report - Fourth Quarter 2002 i Y P ' SUTTER OFFICE CENTER 242 North Sutter Street, Stockton, California ' 1.0. INTRODUCTION ' At the request of Ms Juli Lozano of the SUTTER OFFICE CENTER,Advanced GeoEnvironmental, Inc (AGE) has prepared this quarterly report for the property located at 242 North Sutter Street in Stockton, California (the site) The scope of work included conducting a quarterly ground water ' monitoring event and preparation of this report The site setting is illustrated on Figure 1 Site structures, soil boring and monitoring well locations are depicted on Figure 2 2.0. BACKGROUND AND SITE LOCATION The site is located in a commercial area of low topographic relief in central Stockton, California There is one multistory building (242 North Sutter Street) occupied by multiple businesses on the western portion of the site, the remaining portion consists of paved parking 21 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the southern portion of the Great Valle Geomorphic Province of p Y � ' California, a large, elongate, northwest trending, asymmetric structural trough, the northern and southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, respectively 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-denved sediments were primarily deposited in lacustrine, fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the valley(Olmsted and Davis, 1961),the site itself is located on unconsolidated and semi-consolidated I alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977) Rocks composing the basement complex of the Province have not been completely defined but are believed to be metamorphic and igneous in origin IThe Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the principal sources of domestic ground water 1n the 13,500-square mile San Joaquin Valley Ground Water Basin (Basin 5-22) Based on review of the Lanes of Equal Depth to Groundwater Spring 1999 map published by the San Joaquin County Flood Control District and Water Conservation District (FCD&WCD), the estimated depth to ground water at the site to be 30 feet bsg Review of I