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General Stormwater Management Mosquito Control BMPs •Ensure Mosquito Control Agencies have access to infrastructure to inspect or make appropriate treatments when necessary, •Manage sprinkler and irrigation systems to minimize runoff entering stormwater infrastructure. •Avoid intentionally running water into stormwater systems by not washing sidewalks and driveways,washing cars on streets or driveways,etc. •Inspect facilities weekly during warm weather for the presence of standing water or immature mosquitoes. •Remove emergent vegetation and debris from gutters and channels that accumulate water. •Consider mosquito production during the design,construction,and maintenance of stormwater infrastructure. •Design and maintain systems to fully discharge captured water in 96 hours or less. •Include access for maintenance in system design. •Design systems with permanent water sources such as wetlands,ponds,sumps, and basins to minimize mosquito habitat and plan for routine larval mosquito inspection and control activities with the assistance of a local mosquito control program. Stormwater Treatment Ponds and Constructed Treatment Wetlands •Whenever possible,stack stormwater ponds and constructed wetlands with mosquito-eating fish available from local mosquito control programs. •Design and maintain accessible shorelines to allow for periodic maintenance and/or control of emergent and shoreline vegetation, and routine monitoring and control of mosquitoes. Emergent plant density should be routinely managed so mosquito predators can move throughout the vegetated areas and are not excluded from pond edges. •Whenever possible,design and maintain deep zones in excess of four feet(1.2 m)to limit the spread of invasive emergent vegetation such as cattails.The edges below the water surface should be as steep as practicable and uniform to discourage dense plant growth that may provide immature mosquitoes with refuge from predators and increased nutrient availability. •Use concrete or liners in shallow areas to discourage plant growth where vegetation is not necessary. •Whenever possible,provide a means for easy dewatering if needed. •Manage the spread and density of floating and submerged vegetation that encourages mosquito production(i.e.,water hyacinth,water primrose,parrot's feather,duckweed,and filamentous algal mats). • If possible,compartmentalize managed treatment wetlands so the maximum width of ponds does not exceed two times the effective distance(40 feet[12 m]) of land-based application technologies for mosquito control agents Reference: Best Management Practices for Mosquito Control in California(July 2012) Vector-Borne Disease Section California Department of Public Health http:llwww.wesinile.co.aovlre sources.php Planning Commission Staff Report, PA-2200090, PA-2100295 (GP, SA) 37 Response Letters