HomeMy WebLinkAboutPN_Project_Narrative_171113_v1• Project name, size and location of site;
Name: Gene Coulon Park Maintenance Project
Size: 8 maintenance tasks spread across the 57 acres of park.
Location: 1201 Lake Washington Blvd N, Renton, WA 98056
• Brief description of proposed work;
This project can be broken into 8 tasks as described below (see attached map):
1. Trestle Bridge (Impact Location - Below OHW):
Bridge repair will consist of cutting the top portion of 10 damaged piles to stop the
transfer of rot to the superstructure. The piles will not be pulled or replaced due to a
lack of easy access points. Structural members will be installed to re-support the
existing framing.
2. Sailing Club Floats (Impact Location – Below OHW):
A float connection has been damaged due to wear and will be replaced. Agency
approved supplemental floatation to correct freeboard imbalance will also be
installed. Float area is 320 sf. Ramp area is 160 sf.
3. Ivar’s Deck Repair (Impact Location - Below OHW):
The timber decking will be removed and replaced with grated decking along with the
replacement of the corroding steel framing and pile caps. A majority of the timber
deck will be replaced with 60% light penetrating decking (5985 sf) while a small
portion will be replaced with 53% light penetrating decking (945) to maintain a safe
working load for commercial service access. Additionally, the perimeter wave skirt
will be removed and replaced in part at Ivar’s with non-toxic materials as required by
the Aquatic Lands Lease with the Department of Natural Resources (Lease No. 22 -
086143). Timber stringers will be replaced with steel stringers. The steel beams will
be replaced and coated with a durable coating system.
4. North Waterwalk Wave Skirt (Impact Location - Below OHW):
The north waterwalk perimeter wave skirt, consisting of treated timber, will be
removed in accordance with DNR lease requirements. Total length is 667 lineal feet.
5. Transient Moorage Float (Impact Location - Below OHW):
The existing float will be demolished and replaced with a new float in the same
general footprint (2080 sf). The existing gangways will be reused and the float
decking will be replaced with a 62% open light penetrating grating, in accordance
with DNR lease requirements.
6. Boat Launch Wave Barrier (Impact Location - Below OHW):
The boat launch wave barrier treated timber portions within the DNR lease
boundary will be replaced with non-toxic materials. Total length is 60 lineal feet.
7. Boat Launch Pier (Impact Location - Below OHW):
As a result of loss of the protective coating and fungal de cay, the damaged steel
framing (161 lf) and damaged timber piles will be repaired. The pile decay is located
on the top of one timber piles in one of the 3-pile dolphins. Repairs to the dolphin
will include removal of damaged timber sections.
8. South Waterwalk (Impact Location - Below OHW):
Grout between the waterwalk superstructure and the piles is missing in spots and
will be replaced. Grout will be repaired on 39 pile caps.
• Basis for the exemption request (reference exemption category from first page);
WAC 173-27-040(b)
• Anticipated dates of work;
January 2018 – December 2018
• Other permits required for proposed project;
1. City SEPA Exemption - WAC 197-11-800(3)
2. City Building Permit
3. WDFW - Hydraulic Project Approval
4. DNR - Aquatic Use Authorization
5. USACE – Section 10 Work in Navigable Waters
• Current and proposed use of the site;
Currently the site is City park and that use will not change with this project.
• Special site features (i.e. wetlands, water bodies, steep slopes);
Shoreline
• Statement addressing soil type and drainage conditions;
Typical lake deposits with soils of sands and gravels. Drainage mostly occurs overland and
into the Lake Washington.
• Total estimated construction cost and estimated fair market value of the proposed project;
$1,265,000.00
• Estimated quantities and type of materials involved if any fill or excavation is proposed;
No fill or excavation is proposed.
• Number, type and size of any trees to be removed;
None.
• Distance from closest area of work to the Ordinary High Water Mark of the shoreline;
Portions of work are below the OHWM.
• Nature of the existing shoreline (e.g. high bank, naturalize, rip rap, bulkhead, etc.); and
Ranges from natural to bulkhead.
• If the proposed project exceeds a height of 35-feet above the average grade level, discuss
the approximate location of and number of residential units, existing and potential, that will
have an obstructed view.
No view obstructions will occur as part of this work.