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San Joaquin County Community Environmental Setting, Impacts,and Mitigation Measures Development Department Hazards and Hazardous Materials to leach into deeper soils and, eventually, groundwater supplies. Also,newer pesticides tend to break down relatively rapidly,preventing long-term buildup in the soil. However, older varieties of pesticides, such as DDT _ (dichlorodiphenyltrichloroethane)and its derivatives,DDE (dichlorodiphenyltrichloroethylene)and DDD (dichlorodiphenyldichloroethane), are much longer lived. The pesticide DBPC (dibromochloropropane)has been discovered in wells in San Joaquin County and other parts of the state and has caused wells to be shut down. Additionally,underground storage containers have been found to be a source of contamination of soil and groundwater. Illegal dumping and disposal of household hazardous wastes at the County's solid waste disposal facilities pose an additional hazard,as well as accidental dumping of hazardous wastes (San Joaquin County 1992). Hazardous Waste Production and Facilities The California Department of Health Services estimates that within San Joaquin County approximately 33,270 tons per year of hazardous waste are generated. Approximately 17,780 tons of this total is managed on-site,that is, in treatment, storage, or disposal facilities located on the property producing the waste. The other 15,490 tons is managed off the property at hazardous waste facilities(San Joaquin County 1992). At present,two Hazardous Waste Facility permits have been issued and two permits are under study within San Joaquin County. The permits issued are for _ McCormick and Baxter Creosoting Company and Tracy Defense Depot. Tracy Defense Depot, located on Chrisman Road southeast of the City of Tracy,has been issued a container storage permit by the San Joaquin County Environmental Health Department(EHD)The general types of waste handled include motor ' oils,other petroleum products, solvents,process chemicals, and other chemicals that have passed their shelf life. All potential hazardous wastes are either resold, recycled, or transported to a Class I site for disposal(San Joaquin County 1992). The two hazardous waste permits under study by the EHD are temporary storage facilities for PCB(polychlorinated biphenyl)transformers at the Stockton Development Center and Deuel Vocational Institution(San Joaquin County 1992). Vector-Borne Disease Vector-bome diseases such as western equine encephalitis, St. Louis encephalitis and West Nile virus are primarily transmitted through the bite of an infected mosquito and have the potential to harm humans,horses and other animals _ throughout California. West Nile virus,presently the most discussed of these diseases,was first detected in the United States in New York in 1999. Since then,it has spread throughout the United States, Canada,and Mexico,with activity found throughout California. West Nile virus was first found in test chickens, dead birds,trapped mosquitoes, and horses and humans within San DeSilva Gates Quarry Project —" Draft Environmental Impact Report 3.1-2 J&S 05105.05