Laserfiche WebLink
0 0 <br />BMP and <br />Infeasibility description <br />applicable lists <br />Infeasibility criteria <br />and rationale for each <br />BMP not selected <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 <br />(e.g., 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 />❑ Where infiltrating water would threaten shoreline structures such <br />as bulkheads. <br />The following criteria can be cited as reasons for infeasibility without <br />further justification (though some require professional services to <br />make the observation): <br />❑ Evaluation of infiltration is not required per the Infiltration <br />Infeasibility Map due to steep slopes, erosion hazards, or landslide <br />hazards. See City's infiltration infeasibilty map. <br />❑ Within setback provided for BMP T7.30 (DCSS Section 4-4.1(3)) <br />❑ Where they are not compatible with surrounding drainage system <br />as determined by the city (e.g., project drains to an existing <br />stormwater collection system whose elevation or location <br />precludes connection to a properly functioning bioretention area). <br />City of Everett Public Works <br />Small Project Stormwater Site Plan Report -Dec 2079 26 <br />