7500 HARDESON RD 2021-06-09 - Laserfiche WebLink

r During the period of October 1 through April 30, all disturbed soil areas will be covered or stabilized within 2 days or 24 hours when a major storm event is predicted. Cover measures may include mulching, netting, plastic sheeting, erosion control blankets, or free draining material. The extent of clearing shall be limited to the amount of land that can be covered or stabilized within 24 hours. Soil stockpiles shall be stabilized by plastic covering or surrounded by filter fabric fence. The Contractor has the option of providing all required material for cover measures onsite at all times or preparing a plan of action to submit to the City. A plan of action shall contain the following: I • Contractor's name, address, phone number, and emergency phone number. • Alternate contact with above information. • Clearly defined plan of action designed to prevent offsite migration of sediments, which will be implemented in the event that a major storm is predicted or offsite erosion is observed by the Contractor, his/her employees, or the City. • Description of materials to be used for cover and means by which it will be placed. List equipment to be used or number of personnel anticipated to be used to spread material. • Vendor or supplier of materials to be used; list two alternates and include phone numbers. r • Means and timeframe for cleanup of any materials that escape offsite and for repairs to the natural system if damages have occurred. IIn order for the erosion and sediment control (ESC)facilities to function properly, they must be maintained and have sediment removed on a regular basis. Inspection and sediment removal shall be performed on all ESC facilities, as described in the inspection schedule located in Section 7.11 of this report. 7.6 Protect Slopes ' All stormwater runoff from the site shall be directed to the interceptor ditches and the sediment trap to prevent erosion of the steep slopes. All disturbed areas that have reached final grade or are not being actively worked shall be seeded, mulched, or protected with plastic covering. 7.7 Protect Drain Inlets All catch basins within adjacent roadways to the site shall be protected with inlet protection (BMP C220). 7.8 Stabilize Channels and Outlets All channels and outlets onsite shall be stabilized to prevent erosion from the 10-year, 15-minute time step flow rate predicted by an approved continuous runoff model. Outlets shall be lined with riprap to prevent erosion (BMP C209). Channels shall be lined with check dams, as noted on the plans (BMP C207). 7.9 Control Pollutants The Contractor shall be responsible for controlling pollutants at the work site. Key elements, such as centralized areas for equipment and concrete truck washing, and temporary storage of debris and other stockpiled materials, are the responsibility of the Contractor. Construction Stormwater Pollution Prevention Plan Everett 7-Eleven 5 2180309.10