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The surfi ci al deposits of minerals are Holocene in age (0 to 11 , 000 years) and consist of undivided alluvial -flood plain deposits of sand , silt , and clay . A contact exists on the site between the Holocene deposits and older Pleistocene materials of the Modesto Formation . This formation consists of fluvial deposits of silt and sand , eolian deposits of loose sand , and compact silt and very fine sand . The site is listed in the Uniform Building Code as a seismic zone 3, but seismic probability mapping indicates a very low probability of significant earthquake activity . The Great Valley Fault Zone is located about 13 miles west-southwest , and the Foothills Fault System is located about 33 miles to the east- northeast . Both faults are considered as inactive . Exploratory borings encountered undifferentiated sands containing varying quantities of silt and clay throughout the proposed mining horizon of up to 48 feet . 4 . 6 Soils Soils in the project area have formed from alluvial flooding, and are rated as Class III if irrigated, and Class IV without irrigation . These soils are marginal for farming . In the case of class IV soils, careful crop management must be exercised for _ successful farming. Recoverable topsoil depths range from approximately two feet to four feet . Soils identified by the Soil Survey of San Joaquin County (SCS 1992) include : 1 . Dello (#148) in the west 2/3 of the property . This soil is rated as a Class IV without supplementary water , and as a Class III with irrigation . 2 . Egbert (#153) in the southwest corner of the property . This soil is rated as a Class IIW with irrigation and IVW without supplementary water . 3 . Grangeville (#166) in the eastern 1/3 . This soil is classified as IIW with irrigation . Landmark Lathrop Group, LLC - 5 - February 3, 2000