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Analysis Proiect Description The property is located south of Linne Road on the east side of MacArthur Drive, just south of the existing Rose Pit. The application is for a surface mining permit to excavate sand and gravel. The excavation will take place on approximately 147 acres of the 157-acre site, in two phases, over a six-year period. It is estimated that 7,600,000 cubic yards of sand and gravel will be excavated from the site during this period. The depth of excavation ranges from 31 to 62 feet from the existing ground surface. The site is known as the Traina property, which has a General Plan designation of Open Space/Resource Conservation (OS/RC) and is zoned General Agriculture, 40-acre minimum parcel size (AG-40). General Plan/Zoning/Williamson Act The General Plan designation for the site is Open Space/Resource Conservation (OS/RC) because it contains significant mineral resources in the form of sand and gravel reserves. The proposal is consistent with the County's General Plan Objectives and Policies regarding Extractive Resources. The zone is General Agriculture, 40-acre minimum parcel size (AG-40). The project site is not in a Williamson Act Contract. Water Resources The excavation will occur to a maximum depth of 62 feet. Ground water was detected at a depth of 62 feet in Test Boring B-2, which was drilled in the southeast corner of the property. However, ground water was not detected in any of the other borings drilled on the site to a depth of 75 feet. Therefore, the ground water detected appears to be a localized perched water zone. The plans indicate that there is a drainage course that runs along the southern boundary of the site. This drainage course has been identified as Corral Hollow Creek. The recommended Conditions of Approval require that a minimum 100-foot setback be established from the centerline of the creek to the top of the cut slope. Geotechnical/Soils A Soils Evaluation and Reclamation Plan report was prepared by Dellavalle Laboratory, Inc., and submitted as part of the application. The report identified the following soil types on the Traina property: Capay series, EI Solijo series, Vernalis series, Zacharias series, and Xeroflurents. Eighty-five percent of the site has been identified as prime soils, while 15 percent of the site has been identified as nonprime soils. During the excavation, the topsoil will be shipped off and stockpiled. The topsoil will be replaced during the excavation process. The site will be excavated to depths ranging from 31 to 62 feet. The site will be reclaimed to a finished elevation approximately 28 feet below the existing ground surface. The applicant proposes to excavate the side slopes at a rate of 1.5 horizontal to 1 vertical. The proposed finished, reclaimed slopes are proposed to be 2 horizontal to 1 vertical. A Report of Slope Stability Analysis was prepared by Kleinfelder, Inc., and submitted with the application materials. The analysis concludes that the slopes should be stable but cautions there could be some minor sloughing in the loose upper materials of the s San Joaquin County OX-96-2,,7eichert Community Development Page 7