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