12011 19TH AVE SE PARKING LOT 2021-12-23

• STORM WATER SITE PLAN OCTOBER 23,2019 EMORYS ON SILVER LAKE PAGE 4 MR2: CONSTRUCTION STORMWATER POLLUTION PREVENTION Construction stormwater pollution prevention plan will be prepared for review and approval as part of the construction drawing submittal phase. Following is a conceptual SWPPP for the site. 1. CONSTRUCTION STORMWATER POLLUTION PREVENTION ELEMENTS A Construction Storm water Management Plan has been prepared as part of the construction drawings and is submitted for review and approval by the City of Everett. The 13 Required Elements are addressed as follows: Element#1: Preserve Vegetation/Mark Clearing Limits The construction plans delineate the limits of the clearing for the site. These will be located in the field prior to clearing taking place. Element#2: Establish Construction Access Access will be from the existing parking access from 120th Place SE. The access will be stabilized with rock construction entrance. Element#3: Control Flow Rates There should be little need to control flow rates during the parking lot construction as the area has been an impervious parking lot for many years. The storm system is an open pond and will be configured as a sedimentation pond during construction. It will be fully installed before any home construction begins. Element#4: Install Sediment Controls A construction sequence lists the schedule for installation of erosion control measures. Element#5:Stabilize Soils In planting areas the exposed soils will be stabilized with lawn and landscaping and parking areas stablilized by BMP C107 roadway base.Temporary stockpiles will be covered with plastic. Element#6: Protect Slopes There are no steep slopes on the property and proposed slopes will be limited to 2:1 maximum. Element#7: Protect Drain Inlets The catchbasins along 120th Place SE and 19th Avenue SE will be subject to potential runoff from the disturbed areas and will be protected with filter inserts. Element#8:Stabilize Channels and Outlets Outlet protection for the outlet to the pond will be used per BMP C209. Element#9: Control of Pollutants All pollutants, including waste materials and demolition debris, that occur onsite shall be handled and disposed of in a manner that does not cause contamination of stormwater. Good housekeeping and preventative measures will be taken to ensure that the site will be kept P:\Work\Projects\2018\18-141 Emory's\CE\DOCS\Final SSP 18-141.doc