Amendment R0003 - HAHD AWSP FPF Preposal Conference Technical.pdf

Purpose: Design and construct a downstream fish passage facility at Howard A Hanson Dam (HAHD) to improve abundance and productivity of ESA-listed salmon and steelhead in the Green/Duwamish basin and contribute to the survival and recovery of the Southern Resident Killer Whales

• Restores biological connection of upper watershed (45% of total area) to the lower watershed via salmon migration

• Substantially increases salmon and steelhead productivity by providing over 100 miles of high-quality river and tributary habitat

• Increases ESA-listed Chinook salmon access to substantially more spawning and rearing area – 221 square miles of undeveloped watershed

• Expected to increase population of Chinook salmon, the primary food source for ESA-listed Southern Resident killer whales

HOWARD A. HANSON DAM AWSP

DOWNSTREAM FISH PASSAGE FACILITY

Location: 35-miles SE of Seattle at River Mile 64 on Green River; in Tacoma municipal watershed

Description: Earth-filled high-head 675’ crest; crown width 23’; max height 235’; top elev. 1228’; design pool

1206’; PMF 1224’;

History & Background: Authorized as Eagle Gorge Dam in Rivers & Harbors Act of 1950 for 106k af flood storage (NOV-FEB) & 24.2k af summer low flow augmentation for fish

Construction: Total at 1962 completion $39M Purposes: Flood Risk Management and Fish

Conservation (1950), Water Supply and Ecosystem Restoration (1999)

HOWARD A. HANSON DAM OVERVIEW

DAM OVERVIEW

Authorization: WRDA 1999, updated WRDA 2022

Sponsor: Tacoma Public Utilities

Multi-Purpose Project:

‒ M&I Water Supply ‒ Ecosystem Restoration

Phase 1: 20,000 acre feet of Municipal and Industrial Water and fish passage (1167’)

Phase 2: 2,400 acre feet of M&I and 9,600 acre feet of low flow augmentation, additional fish and wildlife habitat (1177’)

ADDITIONAL WATER STORAGE PROJECT (AWSP)

RFP/SOW- Preconstruction Services Scope

1. Concrete Mix Design

2. Bulkhead Inspect and Test Pool

Attachments

1. Design Schedule

2. Plan Sheet List

3. Conceptual Design Drawings

4. 35% Design Documentation Report (FIO)

5. Construction Specifications Table of

Content

6. Draft Division 1 Specifications

7. Geotechnical Baseline Report, Information

Report, and Data Report

8. USFWS 2022 Biological Opinion

9. NMFS 2019 Biological Opinion

10. 401 Certification

RFP DOCUMENTS

11. Existing Bulkhead Inspection Report

12. Statement of Work: Existing Bulkhead Inspection

13. As-Builts (NDA required)* 14.Existing Bulkhead ROV inspection Video* 15.Bim Model (FIO)* 16.Survey Data (FIO)*

* Attachment is available to be sent via DoD SAFE upon request via email to Adam Birkland: adam.birkland@usace.army.mil.

CURRENT CONDITION

CONCEPT DESIGN – FRONT ISOMETRIC

CONCEPT DESIGN – REAR ISOMETRIC

CONCEPT DESIGN – GENERAL SITE

CONCEPT DESIGN – INTAKE/BULKHEAD

CONCEPT DESIGN – MULTIPORT COLLECTOR

CONCEPT DESIGN – STEEP SLOPE BYPASS

CONCEPT DESIGN – ACCESS TOWER

CONCEPT DESIGN – STILLING BASIN

THANK YOU!