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4. SWPPP NARRATIVE <br />The intent of this section is to provide the information necessary to support the engineering <br />plans in order to implement a design that will; reduce, eliminate or prevent the discharge of <br />stormwater pollutants, meet or exceed the water quality and sediment management <br />standards for the County and State, and prevent adverse impacts to the receiving waters <br />for this project. <br />A. SITE GRADING/EROSION CONTROL RISK ASSESSMENT <br />Area proposed to be cleared/worked: <br />Average slope for the site: <br />Erosion Hazard of Soil <br />Critical Areas downslope <br />Site is upstream of an ESA Stream <br />0.36 acres <br /><22% (Area of Disturbance Only) <br />Moderate <br />Yes (Steep Slopes) <br />No <br />Based on the above information and the fact that the slope of the area of the site to be <br />disturbed is moderate to steep and construction site runoff will pass through silt fencing or <br />other perimeter filtration features prior to leaving the 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 Moderate Risk. <br />B. SWPPP MINIMUM ELEMENTS <br />1: Preserve Vegetation and Mark Clearing Limits <br />The first step in the construction process is for the contractor to fence the limits of <br />clearing/disturbance (BMP C103) prior to any other construction activity. The engineering <br />plans locate and provide the square footages for the areas of grading, clearing, impervious <br />surfaces and un-disturbed areas on the proposed site. As. much of the natural vegetation <br />as possible will be preserved on this project (BMP C101). Approximately 86% of the site <br />may be cleared or disturbed for this project. <br />2: Establish Construction Access <br />The SWPPP calls for a gravel construction entrance to be installed that takes access from <br />Madrona Ave. At this time winter work is expected during the wet season. <br />3: Control Flow Rates <br />This project is below the thresholds requiring flow control for the project. <br />4: Install Sediment Controls <br />This -site °SWPPPproposes to construct/maintain a gravel construction entrance (BMP <br />C105). A vegetative buffer (BMP C102), silt fencing (BMP C233) and retention of the existing <br />vegetation (BMP C101) will provide a vegetated strip around the work area and any adjacent <br />property line. The construction of these features should be completed before the clearing <br />and grading of the site. <br />Mazza SFR 19-1014 <br />November 2019 <br />"Revised: April'2020 Page 6 <br />