8615 7TH AVE SE 2021-02-26 - Laserfiche WebLink

4: Install Sediment Controls This site SWPPP proposes to construct/maintain a gravel entrance (BMP C105), vegetative buffer(BMP C102), and retention of the existing vegetation (BMP C101)that will provide a vegetated strip around the work area and any adjacent property line. The construction of these features should be completed before the clearing and grading of the site. Mulch (BMP C121)will also be used on the exposed soil as necessary to limit erosion. In addition, streets shall be cleaned as needed at the end of each workday or throughout the day if dirt and debris is tracked onto the paved surfaced. 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. 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 techniques 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 soil should be covered or wetted (BMP C140) to reduce the production of dust. 6: Protect Slopes All disturbed slopes on site during construction are required to be protected with mulch (BMP C121) or other means as specified in the construction sequence like surface roughening (BMP C130). No concentrated runoff or significant amounts of sheet flow will be directed to new cut or fill slopes during construction (BMP C206). 7: Protect Drain Inlets The on-site adjacent yard drains and CBs will be protect with silt socks. This will provide the necessary protection of the downstream system from sediment laden runoff. Silt socks may be added to additional on-site and off-site CBs if it is found during construction sediment laden runoff is reaching unprotected grates. 8: Stabilize Channels and Outlets No new channels or outfalls are proposed as part of this project. 9: Control Pollutants No outside chemicals are expected to be necessary for the construction of this project. Concrete truck chutes, pumps, internals, and hand tools shall be washed out only into. formed areas awaiting installation of concrete or asphalt. Unused concrete remaining in the truck and pump shall be returned to the originating batch plant for recycling. When no formed areas are available, washwater and leftover product shall be contained in a lined container and disposed of in a manner that does not violate water quality standards. All vehicles working on and around the site would need to meet the State requirements for emissions. A drip pan or other appropriate temporary containment device shall be placed at locations where leaks or spills may occur during the fueling or maintenance of machinery. Zillah 2-Lot SFR's 18-0605 June 2018 Page 8