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BMP and Infeasibility description applicable lists Infeasibility criteria and rationale for each BMP not selected T5.15 The following criteria can be cited as reasons for infeasibility without Permeable further justification(though some require professional services to Pavement make the observation): (continued) E At sites defined as"high-use sites"(refer to the Glossary in the SWMMWW Volume I). ❑ In areas with"industrial activity"as identified in 40 CFR 122.26(b)(14). ❑ Where the risk of concentrated pollutant spills is more likely such as gas stations,truck stops,and industrial chemical storage sites. ❑ Where routine,heavy applications of sand occur in frequent snow zones to maintain traction during weeks of snow and ice accumulation. ❑ Where the seasonal high groundwater or an underlying impermeable/low permeable layer would create saturated conditions within 1 foot of the bottom of the lowest gravel base course. 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. E 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. E 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. City of Everett Public Works Small Project Stormwater Site Plan Report-Dec 2019 33