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U 'r SIGNIFICANT IMPACTS IDENTIFIED IN THE INITIAL STUDY TRAFFIC It is anticipated that there will be approximately 100 to 150 truck trips per day associated with the proposed quarry. The proposed haul route will be from the site, across the Delta Mendota Canal, which runs along the eastern boundary of the property, and north on Koster Road, with approximately 5 percent of the trucks heading east of Koster Road and 5 percent heading west on Koster Road and then north on Bird Road. The remaining 90 percent will continue north on Koster Road through the intersection of Blewett Road and Koster Road. At the intersection of State Route 132, approximately 10 percent of the trucks will head east on State Route 132, with the remaining trucks expected to head west to Interstate 5 or to continue west on State Route 132. The E1R prepared for the Teichert Aggregates quarry excavation located directly west of this project site noted that State Route 132 is already operating at an unacceptable level of service betwen Interstate 580 and Koster Road and that trucks hauling aggregate materials will likely accelerate deterioration of the roadway structure of State Route 132 and other area roadways. f - I SOILS GEOLOGY The proposal is to excavate to an elevation of 85 feet. Preliminary information indicates that the water table is approximately at an elevation of 75 feet. At the conclusion of the excavation, five feet of top soil will be added to the pit floor to bring it up to a finished elevation of approximately 90 feet. From the contours submitted on Sheet 4 of the plans, the property slopes down in a northeasterly direction. The depth of the excavation will be approximately 125 feet. Because of the depth of the cut, the proximity to the Delta Mendota Canal and the California Aqueduct will need to be addressed. From the typical section shown on Sheet 5, Section CC inicates that the working slopes will be excavated to a slope of .75:1, Final slopes will then be backfilled against this working slope to create a final slope of 1.5:1 with 20-foot benches. To construct a fill slope against a cut slope is a difficult process and will need to be substantiated with soil testing, slope stability analysis, and special inspections. I Given the depth of the pit and steepness of pit slopes, it is questionable whether or not it will be feasible or possible to reclaim the pit floor to an agricultural use such as row crops, as is proposed. Two types of soil have been identified on the site: Zacharias clay loam, Class 1 irrigated; and Zacharias gravelly clay loam, Class II irrigated. Both soils are classified as prime. AIR QUALITY f In their referral response, the San Joaquin Valley Unified Air Pollution Control District stated that based on the project's size and the anticipated increase in truck traffic, it appears that operation of the quarry would exceed the District's interim threshold for significant impact for oxides of nitrogen (NOX) and possibly other pollutants. Therefore, the District requests that an air quality impact analysis be prepared to accurately quantify all sources of emissions from the project and to identify feasible mitigation measures. I i Notice of Preparation - 2 - ER-96-3 1