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BMP and <br />Infeasibility description <br />applicable lists <br />Infeasibility criteria <br />and rationale for each <br />BMP not selected <br />T5.14A <br />The following criteria can be cited as reasons for infeasibility without <br />Bioretention <br />further justification (though some require professional services to <br />or Rain Gardens <br />make the observation): <br />(continued) <br />❑ Where land for bioretention is within an erosion hazard, or <br />landslide hazard area. <br />❑ Where the site cannot be reasonably designed to locate <br />bioretention areas on slopes less than 8 percent. <br />❑ Within 50 feet from the top of slopes that are greater than 20 <br />percent and over 10 feet of vertical relief. <br />❑ For properties with known soil or groundwater contamination <br />(typically federal Superfund sites or state cleanup sites under the <br />Model Toxics Control Act [MTCA]): <br />• Within 100 feet of an area known to have deep soil <br />contamination. <br />• Where groundwater modeling indicates infiltration will <br />likely increase or change the direction of the migration of <br />pollutants in the groundwater. <br />■ Wherever surface soils have been found to be <br />contaminated unless those soils are removed within 10 <br />horizontal feet from the infiltration area. <br />• Any area where these facilities are prohibited by an <br />approved cleanup plan under the state MTCA or Federal <br />Superfund Law, or an environmental covenant under <br />Chapter 64.70 RCW. <br />❑ Within 100 feet of a closed or active landfill. <br />❑ Within 10 feet of an underground storage tank and connecting <br />underground pipes when the capacity of the tank and pipe system <br />is 1,100 gallons or less. As used in these criteria, an underground <br />storage tank means any tank used to store petroleum products, <br />chemicals, or liquid hazardous wastes of which 10 percent or more <br />of the storage volume (including volume in the connecting piping <br />system) is beneath the ground surface. <br />❑ Within 100 feet of an underground storage tank and connecting <br />underground pipes when the capacity of the tank and pipe system <br />is greater than 1,100 gallons. <br />City of Everett Public Works <br />Small Project Stormwater Site Plan Report -Dec 2019 27 <br />