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San Joaquin County Environmental Checklist Water Supply The water supplied to the landfill operations is currently supplied via an onsite water distribution system that includes wells,pipelines,fire hydrants,and overhead filling stations for the facility's water trucks. The well used for potable water is located south of the employee/maintenance building. Water from the well is pumped through a chlorination subjection system located in the well pumphouse (Kleinfelder 2005). In addition,water is available from the retention pond on the east side of the landfill property. Because no new facilities or operational changes are proposed,it is anticipated that the proposed project.would not substantially increase water demands or use at the landfill facility from existing conditions. Wastewater The Central Valley Water Board is the agency that oversees compliance with water quality laws and regulation(see Section VIII,Hydrology and Water Quality,for more information). Permanent restrooms are located in the employee/maintenance building and in the scale house(Kleinfelder 2005). The restrooms in the employee/maintenance building are equipped with sinks,showers,and toilets,and the restroom in the scale house is equipped with a sink. In addition,there are several portable toilets located throughout the landfill facility for use by employees,contractors,and the general public. The wastewater generated by the permanent restrooms is disposed via an onsite septic system located near the employee/maintenance building(Kleinfelder 2005). Because no new facilities are proposed,it is anticipated that the proposed project would not result in a substantial increase in the amount of domestic wastewater generated at the landfill facility as compared to existing conditions. Stormwater As described in Chapter 1,Project Description,the landfill property has several facilities intended to control stormwater runon and runoff. 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 pond on the east side of the landfill property. Some runoff is directed into the wetlands immediately north of the 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,the 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. Landfill operators establish vegetation and construct drainage berms or benches on surfaces that will remain undisturbed for long periods and may be subject to erosion. This helps direct stormwater away from refuse fill areas to the existing Notice of Preparation for the June 2006 North County Recycling Center and Sanitary Landfill 2_73 Permit Revision J&S 06307.06