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l Z 01 May 2007 AGE-NC Project No. 07-1516 Page 5 of 39 2.1. LEGAL DESCRIPTION The parcel map and owner information was provided by ParcelQuest/CD Data at the internet site http://www.parcelquest.com) as a representation of current data down-loaded monthly from the County Assessor's Office. Copies of the parcel map and the owner information are provided in Appendix C. Parcel Number(APN) APN 255-310-20 j Parcel size 19.620 acres T Property Owner Carl M and Ruth M Trinkle (at the initiation of this project) Site Address 31199 South Koster Road, Trac The land use description was listed as industrial on the ParcelQuest document; San Joaquin County Community Development listed the General Plan use as rural residential. 2.2. GEOLOGY AND HYDROLOGY 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. Environmental Data Resources Inc. (EDR), a data retrieval company, provides a report listing the dominant soil composition in the general area of the subject property based on information from the _ United States Department of Agriculture's Soil Conservation Service STATSGO (State Soil Geographic Database)soil maps.The soil surface texture is listed as CAPAY soil,a clay in a Class D Hydrogeologic Group which includes moderate infiltration rates.The corrosion potential of this soil for uncoated steel is high. 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. No obvious Advanced GeoEnvironmental,Inc.