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r 4 : Page 104 FIm acts and Mitigation This section reevaluates and updates the impacts described in the 1994 EIR,and identifies any.new impacts that may result from changes in setting g con dations,new regulations,or the project description. Standards of Sigro fica�rae The Proposed Project would have a significant impact with regard to hazardous materials if it would: ■ Create a potential public health hazard. ■ Involve the use, production or dis sal of materials ls which pose a hazard to people or animal or plant populations in the area affected. Impads Originally Identified is the 1994 EIR Impact K1: Uncontrolled erosion from soil stockpiles and landfill surfaces,or inadvertent d ertent spi1ls of refuse or other substances on-site,contaminate surface water. Since the 1994 EIR,the mitigations identified have been implemented for portions of th. a operating landfill. As described in the Setting section,a Wet Weather Operations Plan,along with an Erosion Control Plan,was completed by the City. In 1996,the City completed the Report of Disposal Site Information,which presented procedures for preventing spills as part of its standard operating plan. The 1999 analysis shows no change to the impact analyses or mitigation measure proposed due to the operation procedures being extended to the expanded landfill. No new regulatory issues have been , identified with regard to management of such erosion potential. As described in the 1994 EIR,this impact would be significant and mitigable with adoption of the following measure, Mitigation K1 1994 EIR): Structural controls shall be constructed to prevent spilled or tracked sediment from entering the stream channel,which shall be regularly cleaned of sediment and landfill refuse. Accumulated material will be properly disposed of in the landfill. Impact K.2: Groundwater contamination would result if the liner leachate collection system for the expansion fails. Operation procedures remain the same as described in the 1994 EIR,and there are no new regulatory requirements stipulating changes in the liner or leachate system design,operation or maintenance. In ? 1996,a Ieachate seep was discovered in the area of the north face of the landfill, An interceptor trench •r: collection gallery was installed,and the leachate was removed and stored in a 12,000-storage tank. In addition,the landfill initially attempted to dispose of the leachate to the City of Stockton wastewater f treatment plant(as described in the 1994 EIR);but the toxicity of the leachate was prohibitive. The City a ' of Stockton is currently under contract with Ramos Environmental to pick up the leachate and dispose of it off-site to a licensed Treatment and Disposal Facility. The new landfill operator would also be required to arrange for similar off-site disposal of project leachate. As described in the 1994 EIR,this impact -: would be significant and mitigable with adoption of the following measure. Mitigation K;2(1994 EIR): (a)Landfill design includes a separation of at least 25 feet between the liner A and groundwater;(b)the liner and leachate collection system for the expansion system have been designed to meet or exceed the regulatory requirements; (c)the project design includes a leak detection GR4SSETTI ENVIRONMENTAL CONSULTING