1427 100TH ST SW 2025-03-03 - Laserfiche WebLink

HUITTZOLLARS HUITT-ZOLLARS,INC. • 1102 Broadway,Suite 301 . Tacoma,WA 98402 . 253.627.9131 phone • 253.627.4730 fax . huitt-zollars.com Permanent Stormwater System Summary: Existing catch basins will be adjusted to match finish grade.Two additional catch basins are provided to drain a low point in the proposed grading adjacent to a new curb island. Engineering Calculations Not required. SECTION 5: OFFSITE ANALYSIS QUALITATIVE ANALYSIS: No stormwater issues have been identified within 1/4 mile of the project site. Stormwater management onsite is proposed to meet LID standards. Flow control and water quality treatment are not required. SECTION 6: CONSTRUCTION STORMWATER POLLUTION PREVENTION PLAN Per the City of Everett Design and Construction Standards &Specifications for Development and Erosion Control Manual (DDECM) the 13 elements of the construction SWPPP are addressed as follows: 1. Preserve Vegetation/Mark Clearing Limits: The clearing limits will be marked with high visibility plastic fence and temporary chain-link fencing. 2. Establish Construction Access:Construction access will be through the existing park entrance. 3. Control Flow Rates: Flow rates will be controlled through the sequencing of construction to minimize disturbance and placement of gravel in areas of exposed soils.Additionally,silt fence along with will be provided at all downstream edge of property and will provided additional flow control. 4. Install Sediment Controls: Sediment control shall be installed as the first order of work to protect sediment entering stormwater facilities. Inlet protection shall be installed on all catch basins adjacent to the project limits. 5. Stabilize Soils: Soils will be stabilized through the placement of gravel,through straw wattles, mulching and through hydroseeding. 6. Protect Slopes: Exposed soils on slopes will be protected by maintaining a maximum slope of 2:1 and through the use of straw wattles and hydroseeding when work in those areas is complete. 7. Protect Drain Inlets: Drain inlets are being protected from sediment with silt fence and inlet protection BMPs. 8. Stabilize Channels and Outlets:There are no proposed drainage channels or outlets with the temporary erosion and sediment control plan. 9. Control Pollutants: Truck fueling will take place offsite, settlement and silt will be managed through the BMPs identified, and no other pollutants are expected to be used on site. Fairway Estates MHC Entry Huitt-Zollars Stormwater Drainage Report December 15,2023 Everett,Washington Page 6