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`ewe ✓ 31 August 2004 AGE-NC Project No.04-1188 Page 2 of 24 west and Parcel 27 to the west by a levee that extended from South Wing Levee to the Old River. Land use of the surrounding properties was agricultural with scattered residential complexes along South Wing Levee. Figure 1 shows the setting of the subject property which included Sections 25, 26, 35 and 36, Township 1 South, Range 5 East, Mount Diablo Base and Meridian (7.5 Minute United States Geological Survey(USGS) Topographic Series, Union Island Quadrangle, California, 1978). The map shows the subject property located at an elevation of approximately 7 feet above mean sea level and in a general area of moderate topographic relief, sloping to the east. At the time of the site visit,both subject property parcels were irrigated agricultural land planted in tomatoes; Parcel 26 included one small residential complex located near South Wing Levee. An elongated pond started on the northern portion of the property and extended along the west side of the internal levee. The subject property pulled irrigation water from the Old River, the residential complex was not inspected, but included a domestic well and septic system. The subject property is depicted in Figure 2; photographs of the subject property are provided in Appendix A. 3.0. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The subject 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 to its present elevation with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly horizontal 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. The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the principal source 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 nearest surface water feature was the Old River,also called Salmon Slough,which extended along the south and southeast boundary of the property. As included in the report prepared by Environmental Data Research, Inc. (EDR) and provided in Appendix D of this report, the U. S. Department of Agriculture's Soil Conservation Service STATSGO (State Soil Geographic Database) soil maps showed the dominant soil composition in the general area of the subject property to be MERRITT soil, a silty clay loam in a Class B Advanced GeoEnvironmental,Inc. r