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Setbacks <br />Local governments may require specific setbacks in sites with slopes over <br />40%, land slide areas, open water features, springs, wells, and septic tank <br />drain fields. Adequate room for maintenance access and equipment should <br />also be considered. Examples of setbacks commonly used include the <br />following: <br />1. All infiltration systems should be at least 10 feet from any structure, <br />property line, or sensitive area (except slopes over 40%). <br />2. All infiltration systems must be at least 50 feet from the top of any slope <br />over 40%. This setback may be reduced to 15 feet based on a <br />geotechnical evaluation, but in no instances may it be less than the <br />buffer width. <br />3. For sites with septic systems, infiltration systems must be downgradient <br />of the drainfield unless the site topography clearly prohibits subsurface <br />flows from intersecting the drainfield. <br />Volume III — Hydrologic Analysis and Flow Control BMPs — December 2014 <br />3-10 <br />