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• <br /> Proposed Site Information: <br /> 1. How will your project change the existing conditions? <br /> THIS PROJECT WILL CONVERT APPROXIMATELY 2,340 SF OF ASPHALT TO ROOF/BLDG AND <br /> WILL REPLACE APPROXIMATELY 1,440 SF OF ASPHALT PAVEMENT WITH ASPHALT OR <br /> CONCRETE. <br /> 2. Please provide the following quantities of proposed hard surfaces in square feet: <br /> Proposed Roof Area: 2,340 SF <br /> Proposed Other Hard Surfaces(pavement,gravel,etc.): 1,440 SF(ASPHALT AND CONC. <br /> PAVEMENT) <br /> 3. How will you manage rooftop runoff after the project is completed? <br /> COLLECT WITH DOWNSPOUTS AND CONVEY TO EXISTING CBs ON-SITE. <br /> 4. How will you manage stormwater runoff from hard surfaces(driveways, paved pathways, <br /> patios,etc.)?Evaluate each type of hard surface separately. <br /> ALLOW TO DRAIN TO EX. CBs AS IN THE CURRENT CONDITION. <br /> Plan for Permanent On-Site Stormwater Management: <br /> You are required to "infiltrate, retain, and disperse stormwater" on your site to the maximum extent <br /> you can without causing erosion or flooding.The goal is to get stormwater runoff in contact with <br /> vegetated surfaces as much as possible before discharging to downstream conveyance systems. <br /> See Volume III, Chapter 12 of the 2010 Stormwater Management Manual for stormwater facility <br /> requirements: https://everettwa.gov/DocumentCenter/Home/View/1214 <br /> 1. Determine which options you must use for managing stormwater from rooftops via downspout <br /> disconnect by considering the following Best Management Practices(BMPs) in order: <br /> • BMP 12.30 On-site Infiltration Areas <br /> • BMP 12.40 Raingardens <br /> • BMP 12.50 Downspout Dispersion <br /> Notes: <br /> a. If location criteria can be met, but sizing criteria cannot,you must implement the BMPs to <br /> the maximum extent you can without causing erosion or flooding. Pre-sized facilities have <br /> been designed to meet 100%mitigation. Facilities may be able to be installed to achieve <br /> some stormwater mitigation. <br /> b. Other innovative downspout control BMPs such as rain barrels,ornamental ponds, <br /> downspout cisterns, dry wells,or other downspout water storage devices may also be used <br /> with prior approval by the City of Everett.These are options to consider after the above <br /> listed BMPs are evaluated. <br /> 2. Determine which options you must use for managing stormwater from hard surfaces (driveways, <br /> paved pathways,etc.) by considering the following for each type of hard surface proposed: <br /> • BMP 12.60 Concentrated Flow Dispersion <br /> • BMP 12.70 Sheet Flow Dispersion <br /> Note: Propose an alternative stormwater management plan if none of the above BMPs can feasibly be <br /> installed. (Examples:Shallow vegetated swale,perforated pipe stub-out, etc.) <br /> Provide your Evaluation below and Show where these will take place on a site map: <br /> a e3of7 <br /> CITY OF EVERETT 13200 Cedar Street I Everett, WA 98201 1425-257-8810 l everettwa.gov <br />