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San Joaquin County Environmental Checklist stormwater facilities. BMPs are also implemented at the landfill as required under the NPDES permit. Each year the county submits an Annual Stormwater Protection Report to the Central Valley RWQCB. Solid Waste The amount of solid waste generated by the typical daily operations of the landfill facility is relatively minor and is limited primarily to office and residential-type wastes generated by employees and administrative office operations. The solid waste generated by site operations is collected and disposed of at the landfill facility in a manner similar to methods used for mixed municipal waste that is transported to the NCRC&SL. Recycling is also conducted on the landfill facility as discussed in Chapter 1,Project Description. Impact Discussion a. As described in Section VIII,Hydrology and Water Quality,existing and post- project facilities control runon,runoff,and erosion. These facilities include a perimeter ditch surrounding the landfill,vegetation and drainage berms to direct stormwater,and an onsite retention pond for stormwater runoff. In addition to these stormwater control facilities,the landfill operator is required to comply with the requirements of the NCRC&SL's existing NPDES permit and must continue to do so under future operations. The landfill's stormwater sampling plan conforms to the requirements of its NPDES permit,and the landfill must submit an annual stormwater protection report to the Central Valley Water Board. Implementation of the existing drainage and erosion control and leachate control measures described in Chapter 1,Project Description,would ensure that the facility operations do not exceed wastewater treatment requirements of the Central Valley Water Board. Potential impacts are considered less than significant. No mitigation is necessary. b,c. Several facilities exist at the landfill property to control stormwater drainage. Runon to the site is controlled by surrounding topography(the landfill is at a higher elevation than the surrounding terrain). Runoff is controlled by a perimeter ditch and a series of ditches within the landfill facility. Most runoff is directed to a retention basin on the east side of the landfill property. Some runoff is directed into the wetlands located on the landfill property, immediately north of the active landfill facility. As part of daily operations during times of surface water runoff,a berm is constructed at the down-gradient edge of the active module to collect runoff from the module. During the year, landfill operators repair and regrade(if needed)the stormwater conveyance structures to prevent ponding of water over refuse. Special care is taken during operations to maintain a positive slope on fill areas to facilitate stormwater runoff. Notice of Preparation for the June 2006 North County Recycling Center and Sanitary Landfill 2-74 Permit Revision AS 06307.06