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Alternative 4: No Project <br /> Aggregate processing and discharge of processing wastewater would not occur at the <br /> :i was <br /> p <br /> .project site under the No Project AlternativeDisposal of wastewater in processing fines Ii <br /> I <br /> and potential impacts to groundwater levels would not result. <br /> I. <br /> Mitigation.Measure_472�7a-Altematives. 1, <br /> - ( _ 2, and 3) <br /> , . <br /> Thi onen install three moniforing wells around the perimeter of the <br /> processing wastewater basin in the Phase IV area to monitor the potential presence <br /> of perched groundwater in the vicinity of the basin. The monitoring wells shall be <br /> designed by a registered engineer or geologist. The wells shall be installed to a <br /> minimum depth of'10 feet.below the elevation of the invert of the Delta Mendota <br /> Canal(for Altematives 1 and 2) or the California Aqueduct (for Altemative 3). The proponent shall monitor groundwater le vets quarterly and submit annual monitoring <br /> reports to the Development Services Division, which include recommended corrective <br /> actions, if necessary. If corrective actions are required, the proponent shall <br /> implement such actions under the direction of the Development Services Division. <br /> J i I� <br /> ,_..: Level of Signifrcance After Mitigation: <br /> Following implementation of Mitigation Measure 4.2-7a, the potential for inducing <br /> perched groundwater conditions and subsequent effects on the Delta Mendota <br /> Canal/California Aqueduct would be reduced to a less-than-significant level. li <br /> II <br /> All Quarry Excavation Alternatives (,_2. and 3] h <br /> Impact 4.2-8 1 <br /> Reduction in Agricultural Capability of Soil Resources <br /> Alternatives 1, 2, and 3 would result in the stripping and stockpiling of the existing soil and !I <br /> '" underlying fine-grained sediments. When irrigated, the soil types present at the project site <br /> have few limitations for agricultural use and are classified as Capability Class I and II. The <br /> I <br /> a project proposes stockpiling the stripped soil for use in the landscaping berm at the eastern <br /> i boundary of the project site. The central portion of the site and bottom of the proposed <br /> mining areas would be reclaimed to agricultural use after filling this area with fine-grained E <br /> sediments recovered during on-site processing of the,aggregate. Relative to the existing f <br /> topsoil horizons at the project site, the processing fines would have significantly reduced <br /> agricultural capability. The processing fines would have very low organic content, a factor <br /> i��- critical to soil fertility. The washed sediments would also be depleted in nutrients such as <br /> r nitrogen and phosphorous and would lack soil microbes. The proposed reclamation plan ! <br /> acknowledges the anticipated low fertility of the processing fines and suggests amendment <br /> �'- of nutrients through the application of fertilizer and the possible addition of organic{ matter.The plan specifically excludes the implementation of agricultural test plots to determine the <br /> expected capability or productivity of the land reclaimed with processing fines. Given the <br /> low nutrient levels and biological activity of the processing fines, the agricultural capability <br /> Draft Environmental Impact Report 4-23 ER-96-3 <br /> I <br />