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BMP and Infeasibility description <br /> applicable lists Infeasibility criteria and rationale for each <br /> BMP not selected <br /> T5.14A The following criteria can be cited as reasons for infeasibility without <br /> Bioretention further justification(though some require professional services to <br /> or Rain Gardens make the observation): <br /> (continued) ❑ 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 /> Cl 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 />