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III. Environmental Setting,Impacts,and Mitigations <br /> J. Geology,Soils and Seismicity <br /> The Stockton clay,0 to 2 percent slopes is considered a prime farmland soil where irrigated. <br /> Estimated yields per acre of crops that can be expected under a high level of management are <br /> listed in Table III.J.L In any given year, yields may be higher or lower than those indicated in <br /> the table because of variations in rainfall and other climatic factors and in management. <br /> TABLE IH.J.1: SOIL AGRICULTURAL PRODUCTIVITY INFORMATION <br /> Capability Estimated Yields,by Crop(tons/acres) <br /> Soil Name Classification Alfalfa Hay Wheat Com Sugar Beets Tomatoes <br /> Jacktone Clay IIIs,irrigated 6 2 4 28 25 <br /> Stockton Clay IIs,irrigated 8 2 5 30 28 <br /> SOURCE: U.S.D.A. Soil Conservation Service, 1993. <br /> The California Department of Conservation, Office of Land Conservation's Farmland Mapping <br /> and Monitoring Program(FMMP)provides maps and statistical data to local governments and <br /> the public, and reports to the Legislature regarding the conversion of farmland and grazing land. <br /> The FMMP designates eight categories of land use,including Prime Farmland,Farmland of <br /> Statewide Importance,Unique Farmland,Farmland of local importance,Grazing land,Urban and <br /> built-up land, Other land, and land committed to nonagricultural use(FMMP, 1992a). <br /> San Joaquin County was added to the Important Farmlands inventory in 1990(due to a lack of <br /> U.S.D.A. Soil Data prior to that time).The first conversion inventory data will be collected <br /> during the 1992 biannual survey(FMMP, 1992b). The 1990 inventory by the Farmland <br /> Mapping and Monitoring Program identifies the project site, aside from the active landfill <br /> surfaces, as Prime Farmland(areas of Stockton clay soils)and Farmlands of Statewide <br /> importance(areas of Jacktone clay soils) (Murphy, 1993). <br /> i <br /> HI.J.5 <br />