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San Joaquin County Environmental Checklist 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 as they near final elevation. This helps to direct stormwater away from refuse fill areas and toward the existing 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. Surface Water Quality In general,surrounding land uses affect surface water quality,with both point- source and nonpoint-source discharges contributing contaminants to surface waters. The impacts of nonpoint-source pollutants on aquatic systems are many and varied. Polluted runoff can result in significant adverse impacts on aquatic ecosystems,public use,human health(associated with ground-and surface water contamination), damage to and destruction of wildlife habitat,decline in fisheries,and loss of recreational opportunities. Small soil particles washed into streams can smother spawning grounds and4marsh habitat. Suspended particulates can restrict light penetration into water and limit photosynthesis of aquatic biota. Metals and petroleum hydrocarbons flushed from roadways and parking lots and fertilizers,pesticides,and herbicides from landscaped areas may cause toxic responses in aquatic life or contaminate possible water supply sources such as reservoirs or aquifers. CWA Section 303(d)requires the identification of water bodies that do not meet, or are expected not to meet,water quality standards or that are considered impaired(affected by the presence of pollutants or contaminants). The affected water body and associated pollutant is then prioritized in the 303(4)list. Furthermore,the CWA requires the total maximum daily load(TMDL)process to assist in guiding the application of state water quality standards,requiring the states to identify streams whose water quality is impaired and to establish the TMDL or the maximum quantity of a particular constituent that a water body can assimilate without experiencing adverse effects. The 303(d)list identifies the Lower Calaveras River as being impaired for diazinon,organic enrichment/low dissolved oxygen,and pathogens. The San Joaquin River is listed as impaired for boron,chloropyrifos, diazinon,DDT,group A pesticides, mercury, and unknown toxicity(U.S.Environmental Protection Agency 2002). Groundwater Resources According to the Department of Water Resources(DWR)California's Groundwater Bulletin 118,the NCRC&SL is located in the San Joaquin Valley Groundwater Basin,Tracy Subbasin. The Tracy Subbasin extends through San Joaquin,Contra Costa, and Alameda Counties. The surface area of the subbasin is 345,000 acres,or approximately 539 square miles. The exact storage Notice of Preparation for the June 2006 North County Recycling Center and Sanitary Landfill 2_52 Permit Revision AS 06307.06