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impervious soils, steep slopes or previously disturbed areas. Areas <br />designated as suitable for septic tank nitrification fields may not be used <br />for stormwater infiltration purposes. <br />Run-off from roads, parking lots, and/or sidewalks shall be <br />directed to undisturbed areas through use of berms, grassed diversion <br />ditches or swales, or other acceptable means to reduce run-off velocity <br />and filter out pollutants. <br />b) Structural Measures <br />Non-structural methods may not adequately control the first inch <br />of stormwater runoff due to the amount of impervious surface proposed <br />to be developed, and other factors such as soil type, slope, presence of <br />floodplains and erodible soils, and/or lack of vegetative cover. In such <br />cases, structural detention ponds, which capture stormwater for slow <br />release through an outlet, are required. Where required, detention <br />ponds shall be constructed in accordance with Appendix A. <br />c) Impervious Surface and Detention Pond Requirements <br />For all protected watersheds, there is a absolute limit on the <br />percentage of lot area which can be covered with impervious surfaces. <br />In some cases, detention ponds are required when the proposed <br />impervious surface ratio exceeds a specified percentage, which is <br />below the absolute limit. <br />Impervious surface and detention pond requirements are as <br />follows: <br />1. Residential Development <br />6 <br />