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San Joaquin County Environmental Checklist State Regulations Porter-Cologne Water Quality Control Act The State of California's Porter-Cologne Water Quality Control Act(California Water Code,Section 13000 et seq.)provides the basis for water quality regulation in California. The act requires a Report of Waste Discharge for any discharge of waste(liquid,solid,or otherwise)to land or surface waters that may impair a beneficial use of surface or groundwater of the state. Based on the report,the RWQCBs issue WDRs to minimize the effect of the discharge. Central Valley Regional Water Quality Control Board The Central Valley Water Board is responsible for the protection of beneficial uses of water resources in the Central Valley region. The Central Valley Water Board uses planning,permitting,and enforcement authorities to meet this responsibility and has adopted the Water Quality Control Plan for the Sacramento River Basin and the San Joaquin River Basin(Basin Plan)(Central Valley Water Board 1998)to implement plans,policies,and provisions for water quality management in the®region. Beneficial uses of surface waters are identified for major surface waters and their tributaries and are described in the Basin Plan. In addition,the Basin Plan identifies water quality objectives and implementation plans for the protection of the beneficial uses of the basin. Environmental Setting Surface Water Resources The Calaveras River flows west approximately 2 miles south of the landfill property. The Calaveras River drains into the Stockton Deep Water Ship Channel—part of the San Joaquin River—in Stockton,California. Historically, the river's hydrology was characterized by highly variable flows during winter months and rapidly attenuating flows during summer months. Current flow management through reservoir operations at New Hogan Reservoir involves reducing the variability and magnitude of winter flows while increasing the consistency and magnitude of summer flows. Several facilities exist at the landfill facility to control runon and runoff. Runon to the site is controlled using a perimeter ditch. The perimeter ditch,along with a series of ditches within the landfill site,also controls surface runoff during storm events and directs the surface runoff to a retention basin on the east side of the site. 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. Notice of Preparation for the June 2006 North County Recycling Center and Sanitary Landfill 2-51 Permit Revision J&S 06307.06