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0 <br />BMP and <br />Infeasibility description <br />applicable lists <br />Infeasibility criteria <br />and rationale for each <br />BMP not selected <br />T5.15 <br />The following criteria can be cited as reasons for infeasibility without <br />Permeable <br />further justification (though some require professional services to <br />Pavement <br />make the observation): <br />(continued) <br />❑ At sites defined as "high -use sites" (refer to the Glossary in the <br />SWMMWW Volume 1). <br />❑ In areas with "industrial activity" as identified in 40 CFR <br />122.26(b)(14). <br />• Where the risk of concentrated pollutant spills is more likely such <br />as gas stations, truck stops, and industrial chemical storage sites. <br />El Where routine, heavy applications of sand occur in frequent snow <br />zones to maintain traction during weeks of snow and ice <br />accumulation. <br />❑ Where the seasonal high groundwater or an underlying <br />impermeable/ low permeable layer would create saturated <br />conditions within 1 foot of the bottom of the lowest gravel base <br />course. <br />T5.14A <br />Note: Criteria with setback distances are as measured from the bottom <br />Bioretention <br />edge of the bioretention soil mix. <br />or Rain Gardens <br />Citation of any of the following infeasibility criteria must be based on <br />an evaluation of site -specific conditions and a written <br />recommendation from an appropriate licensed professional (e.g., <br />engineer, geologist, hydrogeologist): <br />❑ Where professional geotechnical evaluation recommends <br />infiltration not be used due to reasonable concerns about erosion, <br />slope failure, or down -gradient flooding. <br />❑ Within an area whose ground water drains into an erosion hazard, <br />or landslide hazard area. <br />❑ Where the only area available for siting would threaten the safety <br />or reliability of pre-existing underground utilities, pre-existing <br />underground storage tanks, pre-existing structures, or pre-existing <br />road or parking lot surfaces. <br />❑ Where the only area available for siting does not allow for a safe <br />overflow pathway to stormwater drainage system or private storm <br />sewer system. <br />❑ Where there is a lack of usable space for bioretention areas at <br />redevelopment sites, or where there is insufficient space within the <br />existing public right-of-way on public road projects. <br />❑ Where infiltrating water would threaten existing below grade <br />basements. <br />El Where infiltrating water would threaten shoreline structures such <br />as bulkheads. <br />City of Everett Public Works <br />Small Project Stormwater Site Plan Report -Dec 2019 <br />33 <br />