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0 • <br /> Proposed Site Information: <br /> 1. How will your project change the existing conditions? <br /> Proposed development looks to add 10' (footprint)to the western side of the existing <br /> house. The deck will be rebuilt beyond the western edge of the house. The existing drive <br /> will be demolished and replaced with a permeable paver drive way, netting us less <br /> impervious area than what is currently there. <br /> 2. Please provide the following quantities of proposed hard surfaces in square feet: <br /> Proposed Roof Area: 1236 SQUARE FEET+550 SQUARE FEET SOLID DECK <br /> Proposed Other Hard Surfaces(pavement,gravel,etc.): 0 SQUARE FEET <br /> 3. How will you manage rooftop runoff after the project is completed? <br /> COLLECTED, ROUTED TO A CATCH BASIN, AND TIGHTLINED TO THE BASE OF THE SLOPE. <br /> WATER WILL DISCHARGE ONTO GABION OUTFALL. <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 /> HARD SURFACES ON SITE ARE PERMEABLE. DRAINAGE PIPES WILL BE LOCATED <br /> THROUGHOUT THE PAVER ASSEMBLY, PER SITE PLAN,AND WILL COLLECT/ROUTE WATER <br /> TO THE CATCH BASIN. <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 Storm water 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 /> Page3of7 <br />