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f ff 2 survey; one historic site was found, the remains of a former gravel extraction operation of the 1950s. The remains of concrete footings on this site are extremely deteriorated. The integrity and historical value of these remains is evaluated as nil. This report has been entered into the files of the California Historical Resources Information System for San `T Joaquin County, Central California Information Center, California State University, Stanislaus, Turlock. Information pertaining to cultural resources investigations of the proposed project area has been accessioned in the files of the Institute for � Archaeological Research, California State University, Stanislaus (accession number 94-12) . 2: SETTING Natural Setting Description of the Project Area The proposed 500-acre gravel extraction area is located in San Joaquin County, California. This area is within the Great Valley of California, a huge, nearly flat alluvial plain situated between the Coast Ranges on the west and the foothills of the Sierra Nevada on the east. Extending from the Klamath Mountains south 'to the Tehachapi Mountains, the valley is approximately 450 miles long, 40 to 60 miles wide and, in the vicinity of the proposed project area, approximately 140 feet above sea level. Most of the Central Valley is within the Lower Sonoran Zone + (Merriam 1898 ; Storer and Usinger 1963) . The original vegetation aspect of the valley consisted primarily of native bunch grass plains and oak woodlands relieved by well-developed riparian zones along the San Joaquin River and its major tributaries t . (Barbour and Major 1977; Gilbert 1879) , comparable to the Great Valley Riparian Forest (Element Code 61400) and Valley Needlegrass Grassland (Element Code 42110) of the California Natural Diversity Data Base (Holland 1986) . The geology of the Central Valley is described by Hackel t (1966:217--238) and Poland and Evenson (1966:239-248) ; soils by Meyer and Underhill 1972 and Weir 1952 • hydrology b the Y ( ) ( ) + Y gY Y State of California Department of Water Resources (1959) and Taylor (1913) . Central Valley flora is described by Barbour and Major (1977) , Bolsinger (1988) , Griffin (1973) , Holland (1986) , Munz (1965, 1968) , Niehaus and Ripper (1976) , and Smith (1988) ; �-; fauna by Grinnell et al. (1937) , Ingles (1965) , and Stebbins I � (1966) ; avifauna by Peterson (1961) . �f