Stormwater Pollution Prevention Plan
Disturbed area during construction:
3.3 acres
Disturbed area that is characterized as impervious (i.e., access roads, staging, parking):
2.6 acres
2-year stormwater runoff peak flow prior to construction (existing):
0.52 cfs
10-year stormwater runoff peak flow prior to construction (existing):
0.72 cfs
2-year stormwater runoff peak flow during construction:
0.55 cfs
10-year stormwater runoff peak flow during construction:
0.75 cfs
2-year stormwater runoff peak flow after construction:
0.38 cfs
10-year stormwater runoff peak flow after construction:
0.58 cfs
All stormwater flow calculations are provided in Appendix F. INSTRUCTIONS
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REQUIRED TEXT The RCC is a 1.1 mile regional trail that runs through downtown Redmond connecting the Sammamish River Trail to the Bear Creek Trail. Construction activities will include: • Installing a 12-foot cement concrete multi-modal regional trail • Excavating and constructing embankments and landforms • Installing concrete landscape elements along the corridor • Installing gravity block walls • Installing bioretention planters • Installing cement concrete sidewalk, curb and gutter at four (4) intersections • Installing a Rectangular Rapid Flash Beacon (RRFB) at Leary Way • Installing 1 new traffic signal at NE 76th Street and 170th Avenue NE • Paving with hot mix asphalt • Planting trees and shrubs 11