Amendment R0003 - Pre-Proposal Site Visit Packet_05Apr2024.pdf

HOWARD A. HANSON FISH PASSAGE FACILITY:

SITE VISIT PACKET

April 18th, 2024

35873 SE Green River Headworks Rd, Ravensdale, WA 98051

Solicitation: W912DW24R0004

All participants must be pre-registered and provide Government issued photo

ID:

- No Walk-Ups

- No Substitutions

- No Guests

Questions answered via projnet.org Bidder Inquiry Key is: 4M4T85-UNCM3X .

Note: All design concepts are subject to change

Time Duration Location/Purpose 09:00 :30 Offerors meet at Headworks Gate. USACE Team will sign in and register visitors. Review route/safety/expectations and sign AHAs. Board vans.

09:30 :20 Travel to Administration Building 09:50 :10 Break, Presentation Setup 10:00 1:30 Presentation/Q&A 11:30 :30 Lunch/Break (On-site only – lunches must be packed in) 12:00 3:30 Site Visit Tour

1) Dam Crest

2) Left Bank Staging Area

3) Walk to Outlet Structure

4) Boat Launch & Sedimentation Ponds

5) Existing Excavation

6) Six Mile

7) Construction Trailer Area

8) 5509 Staging Area

9) Contractor Parking Area (Headworks Gate)

3:30 :30 Closing Questions and Summary (5509 Staging Area) 4:00 4:30 Return to gate

TENTATIVE AGENDA

Notes There is no cell service on-site. Sanitary facilities are only available in the parking lot and at the administration building. All attendees will be expected to sign an Activity Hazard Analysis before departing for the tour.

Photos may be allowed with restrictions. The details will be provided on-site. No PPE is required for the site visit. Attendees will be required to traverse stairs and steep terrain, potentially during adverse weather. After registering, attendees will not be permitted to leave the facility; participants are strongly advised to bring lunch, snacks, and water.

DAM CREST

• Crest Elevation: 1,206 ft (NGVD 29)

• Critical dam infrastructure (control tower, security gates, bridge, regulating outlet, spillway gates)

• Limited access across crest road (weight, turning radius)

April 18th, 2023

DAM CREST

SPILLWAY OUTLET

• Deceleration tunnel outlet approximately ~1,000 ft downstream from spillway stilling basin

• Road access improvements planned

• Hillside stabilization and drainage improvements

SPILLWAY OUTLET

EXCAVATION SITE

• Existing excavation to be expanded for updated FPF design

• Coffer dam opening to be reduced, gates to be replaced

• Temporary sheet-pile coffer dam to be constructed at base of permanent intake structure

• Existing bulkhead inspection reports will be available with RFP____________________________________________________________

EXCAVATION SITE

• Boat launch in winter months is forebay elevation-dependent

• Sedimentation ponds available for construction effort as-is

BOAT LAUNCH &

SEDIMENTATION PONDS

BOAT LAUNCH &

SEDIMENTATION PONDS

April 18th, 2023

• Construction Trailer Parking at 5509 road junction (highlighted in blue)

• Limited staging areas dispersed around site (additional areas highlighted in red)

• Additional potential staging at TPU Headworks and six-mile sites (next page)

STAGING AREAS

April 18th, 2023: Note, deceleration tunnel, stilling basin locations have changed slightly.

STAGING AREAS

April 18th, 2023: Note, deceleration tunnel, stilling basin locations have changed slightly.

• Potential alternative staging site

• Previous disposal area for excavation spoils

• *Overhead high voltage transmission power lines limit access and usage

SIX-MILE DISPOSAL SITE

SIX-MILE DISPOSAL SITE

ADDITIONAL: 3D HAHD, HEADWORKS & SURROUNDING

AREA

ADDITIONAL: APPROXIMATE FPF ALIGNMENT

Note: Any design concepts shared are subject to change.April 18th, 2023

ADDITIONAL: RENDERS OF PROPOSED FPF