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1 zoned AG, the Farmland Mapping and Monitoring Program's soil classification for the area to be excavated is neither Prime Farmland, Farmland of Statewide Significance, nor Unique Farmland. The portion of the KRC site to be excavated is within MRZ-2 (Mineral Resources Zone), as designated by the State Department of Mines and Geology, and none of the soil within the area of excavation is Prime Farmland, Farmland of Statewide Significance, or Unique Farmland. Soil on the site is characterized as being non-prime and is shown on the San Joaquin County Important Farmland Map as "grazing land.,, Williamson Act: The parcels composing the project site are currently under Williamson Act contracts. According to the Development Title (Section 9-1810.3(b)(1)(w)), property under contract may be used for quarry operations, provided the sites are rehabilitated for agricultural uses. Based on the County's terms for Williamson Act contracts, project uses would be consistent with the Williamson Act, and neither nonrenewal nor cancellation of existing project site contracts would be required for project approval. Recent State legislation, Assembly Bill No. 2663, further codified requirements for uses to be considered as'compatible" on contracted land. The Department of Conservation has typically viewed a permanent or temporary activity or use that significantly impairs the agricultural viability of a contracted parcel as being incompatible. Assembly Bill No. 2663 adds Section 51238.2, which specifically addresses mineral extraction. This section states that mineral extraction may be approved as compatible if the board or council is able to document that the underlying contractual commitment to preserve prime land or the underlying contractual commitment to preserve nonprime land for open space use will not be significantly impaired. This section further stipulates that conditions imposed on mineral extraction as a compatible use of contracted land shall include compliance with the reclamation standards adopted by the Mining and Geology Board pursuant to Section 2773 of the Public Resources Code. Soils and Geology: Excavation will occur in two main areas of the project site; one area comprises the central portion of the site and includes most of Phase I, Phases Ii through IV, and a small portion of Phase V. The second area, located in the northeastern corner of the site, contains the balance of Phase V. The proposed quarry has been designed to contain all runoff from disturbed areas on the site. All excavation boundaries will be sloped back into the active pit to avoid contamination of runoff entering natural drainages that exit the property. Each of the two pit areas will be graded to slope gently toward the west, with a finished slope of approximately 1 percent. Two storm water retention ponds are proposed in the western portion of the large central pit, and one pond is proposed in the western portion of the pit located in the northeastern portion of the site. These ponds will collect drainage water from the working faces of the areas under excavation and will remain after excavation concludes as stockponds and possibly wildlife habitat. As excavation of each of the five phases concludes, reclamation of each phase will commence. Disturbed areas will be reclaimed with overburden and topsoil. The applicants are proposing to respread topsoil approximately 8 inches deep. After topsoil is respread,the phase will be revegetated with annual grasses and blue oaks to establish a natural looking landscape. The endwall slopes around the perimeter of each disturbed pit area are proposed to be no steeper than two feet horizontal to one foot vertical (2:1). As mentioned above, the floor of the pit areas will be gently sloped to conform to surrounding topography, with a grade of approximately 1 percent. The EIR evaluated the potential impacts the quarry expansion may have on soil erosion. The EIR concluded that, based on the proposed slopes, proposed reclamation and revegetation, and implementation of the requirements contained in Section 9-1415.3 of the Development Title, no significant impacts relative to erosion are anticipated. San Joaquin County QX-94-2/KRC Aggregate Community Development Page 8