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2 . Stormwater Treatment Ponds and Constructed Treatment Wetlands : <br /> A . Whenever possible , stock stormwater ponds and constructed wetlands with mosquito - <br /> eating fish available from local mosquito control programs . <br /> B . Design and maintain accessible shorelines to allow for periodic maintenance and / or <br /> control of emergent and shoreline vegetation , and routine monitoring and control of <br /> mosquitoes . Emergent plant density should be routinely managed so mosquito <br /> predators can move throughout the vegetated areas and are not excluded from pond <br /> edges . <br /> C . Whenever possible , design and maintain deep zones in excess of 4 feet ( 1 . 2 m ) to limit <br /> the spread of invasive emergent vegetation such as cattails . The edges below the <br /> water surface should be as steep as practicable and uniform to discourage dense plant <br /> growth that may provide immature mosquitoes with refuge from predators and <br /> increased nutrient availability . <br /> D . Use concrete or liners in shallow areas to discourage plant growth where vegetation is <br /> not necessary . <br /> E . Whenever possible , provide a means for easy dewatering if needed . <br /> F . Manage the spread and density of floating and submerged vegetation that encourages <br /> mosquito production ( i . e . , water hyacinth , water primrose , parrot ' s feather , duckweed , <br /> and filamentous algal mats ) . <br /> G . If possible , compartmentalize managed treatment wetlands so the maximum width of <br /> ponds does not exceed 2 times the effective distance ( 40 feet [ 12 ml ] ) of land - based <br /> application technologies for mosquito control agents . <br /> PA- 2100164 & PA - 2200028 — Conditions of Approval 7 <br />