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San Joaquin County Project Description Drainage and erosion practices would continue under the proposed permit revision. These practices would not be affected by the proposed increased daily disposal tonnage or increased incoming refuse vehicle trips. Increasing the permitted landfill height does not affect the precipitation(total rainwater volume)received because steeper grades associated with increased height would increase the speed at which stormwater is collected. This factor would be addressed in interim drainage construction as the landfill is developed, and in the final Closure Plan (see below). Leachate Control To minimize the generation of leachate in the landfill,the landfill operators minimize the infiltration of rainwater by the application of daily cover and directing stormwater away from the active disposal area in accordance with applicable regulations. These features are designed to minimize contact between stormwater and refuse. Leachate generated in the landfill is managed by the leachate collection and recovery systems(LCRSs) installed in each module and operated in accordance with the Waste Discharge Requirements(WDRs)issued by the Central Valley Water Board. The LCRSs are composed of perforated pipes installed within a drainage layer at the base of each module,above the module liner. Leachate drains through these pipes to a sump at one corner of the module where it is removed by a pump. Leachate is either returned directly to the landfill in accordance with the WDRs or is held in a tank temporarily before being returned to the landfill. Leachate management practices would continue under the proposed permit revision. These practices would not be affected by increased daily disposal tonnage or increased incoming refuse vehicle trips proposed. Increasing the permitted landfill height would entail steeper slopes, which are anticipated to reduce the amount of leachate produced. Dust Control Dust is controlled at the landfill_facility by watering haul roads and tipping areas in accordance with the existing Air Quality Management Permit(AQMP)issued by the San Joaquin Valley Unified Air Pollution Control District(SJVUAPCD) and as required by the County EHD. In addition,paved roads are wetted using a water truck on a weekly basis or as needed. A log is kept with times and general locations of watering at the landfill. Dust control practices would continue under the proposed permit revision. Increased daily disposal tonnage and increased incoming refuse vehicle trips proposed would increase the amount of soil needed to cover the refuse, potentially necessitating increased application of water to the roads and soil. Notice of Preparation for the June 2006 North County Recycling Center and Sanitary Landfill 1-5 Permit Revision J&S 06307.06