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San Joaquin County Community Environmental Setting, Impacts,and Mitigation Measures Development Department Hazards and Hazardous Materials recommendations may include but are not limited to implementing the following fire control requirements of the California Resources Code: ■ maintain a minimum 30-foot firebreak around all buildings and structures(Pub. Res. Code Section 4291), ■ maintain one round-point shovel and one backpack pump water-type fire extinguisher on-site(Pub. Res. Code Section 4427),and ■ attach spark arresters to any engines or vehicles operating in the project area(Pub. Res. Code Section 4442). Impact HAZ-9: Exposure of Public to Potential Disease Vectors (Mosquitoes) (Less than Significant with Mitigation) Mining operations, implementation of the reclamation plan,and the intended end use for the mining pit could all increase the amount of mosquito breeding habitat .. in the project area. Mining operations and reclamation would require pumping to keep the bottom of the pit free of standing water,but,during lulls in operations and after operations cease,it is likely that marshy habitat would develop in the bottom of the pit. Post-reclamation use of the site as a water management facility would introduce water to the basin and thereby encourage the development of riparian vegetation. Both a marshy bottom and riparian vegetation around the basin would increase mosquito-breeding habitat. Because mosquitoes represent disease vectors,this impact is considered potentially significant. Implementation of the following mitigation measure would reduce this impact to a less-than-significant level. Mitigation Measure HAZ-9: Implement Vector Controls for Mosquito Populations at the Mine Site Mosquito control measures must be followed to reduce mosquito populations. A reservoir will not produce mosquitoes if its sides and ' bottom are properly graded,there is little emergent vegetation, and it is stocked with insect-eating fish. Mosquitoes prefer to lay eggs in shallow waters with emergent vegetation(including annual weeds)and shrinkage cracks. Management schemes to reduce mosquito breeding in the reclaimed basin may include the following measures: +- ■ periodically disk the basin bottom(when exposed)and mow developing vegetation to prevent the occurrence of emergent vegetation and eliminate soil shrinkage cracks; ■ maintain a bottom slope of 0.01 to 0.05 percent when dewatering for vegetation management and for mosquito abatement; ■ when standing water cannot be avoided,maintain water depths in excess of 3 feet and steep slopes to prevent growth of emergent plants; DeSilva Gates Quarry Project Draft Environmental Impact Report 3.1-15 JSs 05105.05