4620 SEAHURST AVE 2020-05-20 - Laserfiche WebLink

B. SWPPP Minimum Elements 1: Mark Clearing Limits The first step in the "Construction Sequence" included on the clearing and grading plan sheets is for a surveyor to stake the limits of clearing and to have construction or silt fencing placed along the limits prior to any other construction activity. 2: Establish Construction Access The SWPPP calls for the proposed construction entrance to be installed or the existing asphalt driveway to be maintained as the second step after the staking of clearing limits. A detail is provided on the plans. 3: Control Flow Rates This project will retain as much existing vegetation as possible. In addition, the majority of the future lots will not be disturbed during the construction of the site improvements so only a portion of the 0.73 acres will be cleared at any one time. 4: Install Sediment Controls This site and SWPPP proposes to construct a construction entrance and retain existing vegetation, install silt fencing as needed and install CB inlet protection for the existing catch basins in the Seahurst Ave R.O.W. adjacent to the site and immediately downstream to collect and contain the sediment on this site. These features are intended to minimize " the opportunity for sediment to leave the site via stormwater or on vehicles. The construction of these features is one of the first items required in the "Construction Sequence". Mulch will also be used on the exposed soil as necessary to limit erosion. 5: Stabilize Soils The "Construction Sequence" calls for the stabilization of soils that remain unworked for certain lengths of time based on the time of year. Stabilization techniques may include but not limited to mulching, plastic sheeting or hydroseeding, notes have been added to the plan regarding protection for the stock pile areas if necessary. 6: Protect Slopes All slopes on site during construction are required to be protected with mulch or other means as specified in the construction sequence. 7: Protect Drain Inlets CB inlet protection will be installed on all new catch basins and yard drains on and adjacent to this project. 8: Stabilize Channels and Outlets A dispersion trench will be installed west of the future Lot 3 SFR and the soils downslope from the trench will contain existing vegetation and are not proposed to be disturbed. 9: Control Pollutants No outside chemicals are expected to be necessary for the construction of this project. All vehicles working on and around the site would need to meet the State requirements for emissions. Thompson Short Plat 11-012 May 2011 Page 10