Cottonwood Dr. Stormwater Improvements Project

Project Update: 11/4/17
This project is Complete! A trash rack and native vegetation, including snowberry, salmonberry and pacific nine bark were installed at the end of October. See below for a photo of the finished site with a fresh dusting of snow.

Construction Year: 2017- Completed
Engineer: Tetra Tech Inc.
Contractor: Iverson Earth Works
Construction Contract:  $38,550
Documents:  Final Design Drawings
Project Update:  10/19/17
All of the heavy lifting is over and the Cottonwood Dr Stormwater Improvements project is nearly complete. A berm with a spillway was built around the overflow structure and quarry spall was placed on and around the berm for added protection during high flow events. The hillslope adjacent to the stream was seeded and covered with biodegradable erosion control blanket. Native plants will also be installed in this area in the near future. Rock was placed along the east bank and coir log on the west bank to armor against scour and prevent erosion. The final touches included a split rail fence along a portion of Cottonwood Dr., fresh asphalt and landscape cobbles to tie it all together.
Project Update: 9/25/17
Two weeks down and about a week left on the Cottonwood Dr Stormwater Improvements project. Last week, we focused on establishing the new, wider stream channel. This week we removed a section of the old outlet pipe and put the new structures in place, including a new inlet pipe, catch basin and outlet pipe that connected to the existing storm main. The installation went smoothly and Iverson Earth Works, LLC worked with care as they moved the large concrete structures into place. You may notice the material covering the slopes in some of the pictures; this was in place to protect the exposed soil from erosion during the rain we had on Tuesday. Once the new structures were installed, we began backfilling and compacting the material around the pipes. Next week, we will focus on building a berm around the overflow structure, seeding the hillslope and cleaning up the surrounding facilities. Stay tuned for more progress pictures!
Project Update: 9/15/17
The Cottonwood Dr Stormwater Improvements project is underway and on schedule. Iverson Earthworks, LLC has been hard at work excavating the area for the new stream channel, which meets up with the existing channel, and grading the surrounding slopes, Geotextile fabric was placed within the channel and topped with streambed gravel. An area was excavated and prepared for the placement of the inlet pipe and catch basin structure. Next week, we will be placing the catch basin and inlet pipe. The next step will be to remove a section of the exiting pipe and add a new section for the outlet that will tie into the catch basin.
BB Drive Outfall Phase 1 Progression2