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DESCRIPTION OF PROPOSED EROSION CONTROL BMP's <br /> Clearing, grading, and temporary erosion and sediment control plans have been prepared as part of <br /> the drainage plan drawings. However, since a construction site is dynamic it will be necessary to <br /> reassess the erosion control BMP's during construction and install additional measures when <br /> necessary. <br /> Proposed temporary measures possible for this project will include the following BMP's: <br /> Installation of stabilized rock construction entrance. <br /> Straw mulch, hydroseed or other mulching and planting method to stabilized unworked areas. <br /> Retention of vegetation around site. <br /> CB inlet protection. <br /> Permanent measures to reduce or eliminate erosion or water quality degradation will include <br /> the following BMP's: <br /> Paving all traffic areas (Asphalt) <br /> Permanent landscaping in pervious areas. <br /> Limiting cut and fill slopes to 2:1 maximum and 3:1 maximum where exposed to standing water. <br /> Routine maintenance and inspection of the grounds and response to developing <br /> problems. <br /> The listed erosion control BMP's will be engineered for anticipated conditions in compliance <br /> with Snohomish County and DOE guidelines. With proper installation, maintenance and <br /> inspection the proposed BMP's should result in minimal impact to the surrounding environment.The <br /> County retains the authority by code to require additional measures should the existing measures <br /> prove insufficient. <br /> SITE GRADING/EROSION CONTROL RISK ASSESSMENT <br /> Area proposed to be cleared/worked: approx. 0.2676 acres <br /> Average slope for the site: 1% to 2% <br /> Erosion Hazard of Soil Slight <br /> Critical Areas downslope No <br /> Site is upstream of an ESA Stream No <br /> Based on the above information and the fact that the site is moderately sloped and <br /> construction site runoff will be collected on on-site, and that if site conditions warrant, <br /> additional BMP's can be implemented as corrective measures the Risk Category for this site <br /> is Low Risk. <br /> With the BMP's listed in section B and shown on the site plan, it is anticipated that this <br /> site will have little impact on the downstream system. <br /> Drainage Report—9227 4th Ave W Everett,WA 98204 <br /> Nov. 10,2022 Page 19 <br />