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4. SWPPP NARRATIVE <br />The intent of this section is to provide the information necessary to support the <br />engineering plans in order to implement a design that will; reduce, eliminate or prevent the <br />discharge of stormwater pollutants, meet or exceed the water quality and sediment <br />management ..standards ..for ..the ., City. and .,State., .and prevent adverse impacts to the <br />receiving waters for this project. Note; this narrative is intended to support the SWPPP <br />that is included with the Drainage Plans also a part of this submittal package to the City. <br />A. SITE GRADING/EROSION CONTROL RISK ASSESSMENT <br />Area proposed to be cleared/worked: 0.15 acres <br />Average slope for the site: 20% (Area'of Disturbance Only) <br />Erosion Hazard of Soil Low <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 area of the site to be disturbed is <br />steep and construction site runoff will pass through silt fencing or other perimeter filtration <br />features prior to leaving the site, and that if site conditions warrant, additional BMP's can <br />be implemented as. -corrective measures the .Risk Category for this site is Low 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 flag or 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 />surfaces­aid "un- disturbed-, areas -on "the proposed site. The *entire-, project-, parcel (0.15 <br />acres) will be cleared or disturbed for this project. <br />2: Establish Construction Access <br />The SWPPP calls for the proposed driveway to be used as a construction entrance. At <br />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 SWPPP proposes to. use the proposed driveway as a construction entrance <br />(BMP C105), vegetative buffer (BMP C102), silt fencing (BMP C233) if necessary and <br />retention of the existing vegetation (BMP C101) that will provide a vegetated strip between <br />the cleared areas and any property line. The construction of these features should be <br />completed -before-the'clearing-and grading,lof1he site.`- Mulch (BMP C121) will also be <br />used on the exposed soil as necessary to limit erosion. In addition, streets shall be <br />cleaned as needed at the end of each work day or throughout the day if dirt and debris is <br />tracked onto the paved surfaces: <br />Kikuchi SFR 21-0104 <br />September 2021 Page 6 <br />