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f � IL ! - REPORT OF AGRICULTURAL SOILS AND PROJECT RECLAMATION PLAN Brown Sand Inc. - Vernalis Gravel Mine PROJECT.DESCRIPTION ' Brown Sand desires to expand the permitted reserves of its existing gravel mine in the southern portion of San Joaquin County (T4S, R6E, Sec 6 & 7) near the intersection of Interstate Highways 5 and 580. The gravel mine has been in operation since 1986. Present land use in the area includes mining, agriculture, livestock grazing, and open spaces. A "Description of k Proposed Mining Operation" is on file with the County (File No. QX-94-01). The project encompasses approximately 500 acres within the northern triangle of the highway intersection. The total disturbed acreage is estimated to reach approximately 405 acres. It is the intent of Brown Sand to reclaim the disturbed land and return it to agricultural use. SEE PLATE 1. �f Phase I is Iocated generally southwest of Highway 580 on the alluvial fan of Hospital Creek. The land surface and native vegetation of this phase have been extensively disturbed by past shallow mining excavations in the Hospital Creek stream channel and by overgrazing of �- livestock. Phases I1, 111, and IV are located generally north and west of the intersection of Highways 5 and 580. The present land use in the area includes mining and agriculture. SEE PLATE 2. Statements concerning hydrology, vegetation/wildlife, contaminants, wastewater, and ore processing are found in the Description of Proposed Mining Operation (separate document). 7:r- SITE GEOLOGY AND TOPOGRAPHY The project is located in the Resources Sectors C2, C3, C4, and B3 as defined in the SMARA . EIR No. 9, Designation of Regionally Significant Construction Aggregate Resources in the Stockton-Lodi Production Consumption Region. The project is located along the western flank +�- of California's Great Valley province, abutting the Coast Range province in an area of r northwestern trending faults associated with the San Andreas fault system. An alluvial plain of sediments has accumulated here due to the significant change in elevation of the Diablo Mountains of the Coast Range (1,000 to 3,000 ft) down into the valley (100 to 200 ft). Alluvial fans of Hospital and Lone Tree Creek have been depositing material from the erosion of the Diablo Range in this area throughout Quaternary time (the last 10,000 years). The topography of the project is a gently sloping surface, a gradient averaging 1.5% from the west toward the east. Elevations range from approximately 260 to 320 feet. The regional geology of the coalescing alluvial fans of Hospital and Lone Tree Creeks incorporates a sequence of interbedded gravels, sands, silts, and clays to depths in excess of 150 feet. These alluvial sequences are often cemented to various degrees with caliche, or calcium carbonate. Depth to groundwater has been noted at approximately 200 feet at several wells in the area. { 1 Report Rev.2-0620.95 AGRO ENVIRONMENTAL SERVICES • A Division of Condor Earth Technologies, Inc. Condor j