1508 100TH ST SW 2018-01-02 MF Import

B. SWPPP Minimum Elements 1. Preserve Vegetation and Mark Clearing Limits The first step in ihe construction process is for the contractor to fence the limits oi clearingldisturbance (BMP C103) prior to any other construction activity. The engineering plans lucat= and provide the square footages for the areas oi grading. clearing, impervious suriaces and un-disturbed areas on the proposed site. As much of the natural vegetation as possible will be presPrved on this project (BMP C101). Approximately 100% of the entire site will be cleared or disturbed for this projecl 2 Establish Construction Access The SWPPP calls for the proposed construcUon entrance (BMP C105) to be installed as the second step after the staking of clearing limits Since this project will utilize the existing site access on the property this (eature will not require any excessive grading to install, will be available imrnediately and may require some maintenance to ensure proper funclion during the site work. At this time winter work is expected during the ��et season. 3: Control Flow Rates This project is beiow ihe thresholds requiring flow control for the project. 4 Install Sedimenl Controls This site SWPPP Proposes to construcUmaintain a gravel entrance (BMP C105), vegetative bufier (BMP C102), silt fencing (BMP C233) and retention of the existing vegetation (BMP C101)that will provide a vegetated strip around the work area and any adjacent property line. The con+>truclion of these features should be compieted before the clearing and grading of the site Mulch (BMP C121) will also be used on the exposed soil as necessary to limit erosion. �n addition, streets shall be cleaned as needed at lhe end oi each work day or through out the day i( dirt and debris is tracked onto the paved surfaced. 5 Stabihze Soils The "Construction Sequence" calls tor the stahilization of soils that remain unworked for certain lenglhs of time based on the time of yeac Bare/disturbed soils shall remain uncovered or un-stabilized for no more than 2 days from Oct 1 —April 30 and no more than 7 days from May 1 — Sept. 30. Stabilization lechniques may include but not limited to mulching (BMP C121), plastic sheeting (BMP C123) or hydroseeding (BMP C120), notes have been added to the plan regarding protection for the stock pile area if necessary. A stockpile area has been identified on the SWPPP and is setback a minimum of 25-feet from any down slope property line In addition, during dry periods soii should be covered or wetted (BMP C140) to reduce the production of dust. G Protect Slopes All disWrbed slopes on site during construction are required to he protected wilh mulch �BMP C121) or other means as specified in the construction sequence like surface rougheniny (BMP C130) No concentrated runoH or significant amounts o` sheet ilow will be dirPcled to new cut or fill slopes during construction (BMP C206). 7 Protect Drain Inlets The runoff from this project to the west within the R O.VV. will pass over a vegetoted shouider/swale before being collected by an existing CB. This will provide the necessary proteclion ot the downstream system from sediment laden runoH. Silt socks may be added to the downstream CB i( needed during consiruction AAah 100°� Lot 10 SFR 12-1205�10 � Uec 20t2 Page 7