11500 SILVER LAKE RD 2025-04-21 - Laserfiche WebLink

BMP and Infeasibility description applicable lisp Infeasibility criteria and rationale for each BMP not selected T515 The fallowing criteria can fire cited as reasons for infeasibility without No existing hard Permeable furtherjustification(though some require professional services to Pavement make the observation): surfaces are (continued) ❑ Evaluation of Infiltration is not requited per the Infiltration proposed to be Infeasibility Map due to steep slopes, erosion hazards, or landslide impacted and hazards (See City infiltration and infeasibility map). infiltration BMPs ❑ Within an area designated as an erosion hazard, or landslide are not hazard. recommended, ❑ Within 50 feet from the top of slopes that are greater than 20 see previous percent where the setbacks listed In DCSS Section 44A(3)cannot comments. be achieved. ❑ For properties with known soil or groundwater contamination (typically federal Superfund sites or state cleanup sites under MTCA): • Within 100 feet of an area known to have deep soil contammatlon. • Where groundwater modeling Indicates infiltration will likely increase or change the direction of fine migration of pollutants in the groundwater. • Wherever surface soils have been found to be contaminated unless those soils are removed within 10 horizontal feet from the infiltration area. Any area where these facilities are prohibited by an approved cleanup plan under the state MTCA or Federal Superfund Law, or an environmental covenant under Chapter 64J0 RCW. ❑ Within 100 feet of a closed or active landfill. ❑ Within 100 feet of a drinking water well, or a spring used for drinking water supply, if the pavement is a pollution generating surface. ❑ Within 10 feet of a small on -site sewage disposal drainfeld, including reserve areas, and grey water reuse systems. For setbacks from a"large on site sewage disposal system, see Chapter 246212B WAC. ❑ Within 10 feat of any underground storage tank and connecting underground pipes, regardless of tank size. As used in these criteria, an underground storage tank means any tank used to store petroleum products, chemicals, or liquid hazardous wastes of which 10 percent or more of the storage volume (including volume in the connecting piping system) is beneath the ground surface. ❑ At mufti level parking garages, and over culverts and bridges. ❑ Where the site design cannot avoid putting pavement in areas likely to have longterm excessive sediment deposition after construction (e.g., construction and landscaping material yards). City of Everett Public Works Small Project Stormwater Site Plan Report Dec 2019