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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 Targeted Drainage Plans also a part of this submittal package to <br />the City. <br />A. SITE GRADING/EROSION CONTROL RISK ASSESSMENT <br />Area proposed to be cleared/worked: 0.28 acres <br />Average slope for the combined site: 6% (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 />moderate and construction site runoff will pass through silt fencing or other perimeter <br />filtration features prior to leaving the combined site, and that if site conditions warrant, <br />additional BMP's can be implemented as corrective measures the Risk Category for this <br />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 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 combined site. As much of the natural <br />vegetation as possible will be preserved on this project (BMP C101). Approximately 100% <br />of the site will be cleared or disturbed for this project. <br />2: Establish Construction Access <br />The SWPPP calls for the proposed construction entrance (BMP C105) to be installed as <br />the second step after the staking of clearing limits. Since this project will utilize the <br />existing site access on the property this feature will not require any excessive grading to <br />install, will be available immediately and may require some maintenance to ensure proper <br />function during the site work. At this time winter work is expected during the wet season. <br />3: Controi Flow Rates <br />This project is below the thresholds requiring flow control for the project. <br />Haack Chestnut SFR 15-0118 <br />October 2015 Page 6 <br />