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BMP and <br />Infeasibility description <br />applicable lists <br />Infeasibility criteria <br />and rationale for each <br />BMP not selected <br />T5.12 <br />0 Site setbacks and design criteria provided in BMP T5.12 <br />Required setback <br />Sheet Flow <br />(SWMMWW V4.1) cannot be achieved. <br />for the BMP <br />❑ Positive drainage for sheet flow runoff cannot be achieved. <br />cannot be <br />❑ At Area to be dispersed (e.g., driveway, patio) cannot be graded to <br />provided. <br />have less than a 15 percent slope. <br />❑ At For flat to moderately sloped areas, at least a 10 foot -wide <br />vegetation buffer for dispersion of the adjacent 20 feet of <br />contributing surface cannot be achieved. For variably sloped areas, <br />at least a 25 foot vegetated flowpath between berms cannot be <br />achieved. <br />T5.11 <br />10 Site setbacks and design criteria provided in BMP T5.11 <br />The required <br />Concentrated <br />(SWMMWWV4.1) cannot be achieved. <br />setback from the <br />Flow Dispersion <br />❑ A minimum 3 foot length of rock pad and 50 foot flowpath OR a <br />property line and <br />dispersion trench and 25 foot flowpath for every 700 square feet of <br />the ve etated <br />9 <br />drainage area followed with applicable setbacks cannot be <br />achieved. <br />flowpath cannot be <br />❑ More than 700 square feet drainage area drains to any dispersion <br />provided. <br />device. <br />City of Everett Public Works <br />Small Project Stormwater Site Plan Report -Dec 2019 36 <br />