5001 SOUND AVE 2022-05-13 - Laserfiche WebLink

BMP and Infeasibility description applicable lists Infeasibility criteria and rationale for each BMP not selected T5.14A Note:Criteria with setback distances are as measured from the bottom Bioretention edge of the bioretention soil mix. or Rain Gardens Citation of any of the following infeasibility criteria must be based on an evaluation of site-specific conditions and a written recommendation from an appropriate licensed professional (e.g.,engineer,geologist,hydrogeologist): ❑ Where professional geotechnical evaluation recommends infiltration not be used due to reasonable concerns about erosion, slope failure,or down-gradient flooding. ❑ Within an area whose ground water drains into an erosion hazard, or landslide hazard area. ❑ Where the only area available for siting would threaten the safety or reliability of pre-existing underground utilities,pre-existing underground storage tanks,pre-existing structures,or pre-existing road or parking lot surfaces. ❑ Where the only area available for siting does not allow for a safe overflow pathway to stormwater drainage system or private storm sewer system. ❑ Where there is a lack of usable space for bioretention areas at redevelopment sites,or where there is insufficient space within the existing public right-of-way on public road projects. ❑ Where infiltrating water would threaten existing below grade basements. ❑ Where infiltrating water would threaten shoreline structures such as bulkheads. The following criteria can be cited as reasons for infeasibility without further justification(though some require professional services to make the observation): ❑ Evaluation of infiltration is not required per the Infiltration Infeasibility Map due to steep slopes,erosion hazards,or landslide hazards.See City's infiltration infeasibilty map. ❑ Within setback provided for BMP T7.30(DCSS Section 4-4.1(3)) ❑ Where they are not compatible with surrounding drainage system as determined by the city(e.g.,project drains to an existing stormwater collection system whose elevation or location precludes connection to a properly functioning bioretention area). City of Everett Public Works Small Project Stormwater Site Plan Report-Dec 2019 26