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24 July 1997 AGE-NC Project No. 97-0349 Page 2 of 4 2.3. REGIONAL GEOLOGIC SETTING According to the Geologic Map of California, published in 1977 by the State of California Department of Mines and Geology, the site area is within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending structural trough. The Great Valley Province has been filled to its present elevation with thick sequences of sediment ranging in age from Jurassic to present day, 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 Mountains, respectively. The Great Valley Province is subdivided into two major divisions designated the Sacramento and San Joaquin Valleys. Furthermore, 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 Jacktone-Hollenbeck-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. 2.4. GROUND WATER DEPTH AND FLOW DIRECTION According to the map titled Lines Of Equal Depth Of Water Wells-Fall 1993, published by the San Joaquin County Flood Control and Water Conservation District,the estimated depth to ground water at the property is approximately 80 feet below surface grade(bsg). The prevailing ground water flow direction in eastern Stockton is generally toward the northeast, although flow directions may vary locally and seasonably. 3.0. SCOPE OF WORK The scope of work includes the collection and analysis of subsurface soil samples from the former UST area. AGE proposes to collect soil samples using direct push technology (DPT). Initially, one soil probe boring will be advanced within the former UST area; the probe boring will be advanced to a depth of approximately 50 feet bsg. If necessary, additional soil probe borings will be advanced to adequately characterize the lateral and vertical extent of hydrocarbon-impacted soil. Advanced GeoEnvironmental, Inc.