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San Joaquin County Community Environmental Setting,Impacts,and Mitigation Measures _ Development Department Hazards and Hazardous Materials Impacts and Mitigation Measures Impact HAZ-1 : Potential Hazards Related to Disposal of Hazardous Materials at the Project Site (Less than Significant) Implementation of the project would create a series of deep pits, and these pits would be present at varying depths during the various stages of the mining operations. The northern portion of the site is proposed to contain a basin _ following reclamation of the site. Excavated portions of the project area may lend themselves to improper disposal of solid waste or the illicit disposal of solid waste or hazardous materials by parties that are not associated with project — operations. Because the mining operation would be located in a somewhat isolated and remote area but nearby freeway access,it is possible that people would attempt to use it for waste disposal. Improper disposal or dumping of solid waste could create a public health hazard by supporting pathogens or by contaminating groundwater. San Joaquin County Code requires installation and maintenance of three-strand barbed wire fencing around excavation areas. _ Compliance with this requirement of County Code would ensure that use of the site would be restricted to trained personnel, discouraging unauthorized access and intentional or accidental releases of hazardous or non-hazardous materials _ and would ensure consistency with the policies pertaining to hazards and hazardous materials in the San Joaquin County General Plan. This impact is considered less than significant. No mitigation is required. Impact HAZ-2: Release of Hazardous Materials into the Environment in the Event of Upset or Accident (Less than Significant with Mitigation Incorporated) The proposed Project consists of aggregate excavation and processing with stockpile areas, an asphalt plant,a portland cement batch plant, a concrete recycling plant, and ancillary facilities, such as a shop and office and a new access road,as well as related heavy machinery. Project operations would involve the use of hazardous materials such as fuels, lubricants,and solvents,the accidental uncontrolled release of which could have adverse effects on the environment. During the preliminary review of the project, San Joaquin County OES responded by noting that if the quant'operation will handle or store potentially — hazardous materials in quantities greater than 55 gallons of a liquid, 500 pounds of a solid,or 200 cubic feet of compressed gas, the operator will be required to complete and submit a HMMP to OES. Although the quantities of potentially — hazardous materials have not been finalized and would be dictated by operational needs, it is assumed that the facility would handle or store potentially hazardous materials in an amount requiring an HMMP. Therefore the operator would be required to file an HMMP. Implementation of the following mitigation DeSilva Gates Quarry Project — Draft Environmental Impact Report 3.1-10 MS 05105.05