2-Gates Fish Protection Demonstration Project

1. 2-Gates Fish Protection Demonstration Project DEC Briefing Bureau of Reclamation October 26, 2009

2. Agenda • Introductions • Project Overview (Dennis – 5 min) • Design Overview (Rick – 20 min) • Design Criteria (Gerry – 5 min) • Design Elements • Geotechnical Summary (Ed – 15 min) • Foundation Design (Gerry – 15 min) • Barge & Gate Design • Barge Design & Installation Method (Tom – 20 min) • Gate Design (Michel – 15 min) • Hydraulic System Design (Cecil – 15 min) • Navigation Aids (Cecil – 5 min) • Sheet Pile Barrier Design (Michel – 15 min) • Boat Ramp Design (Michel – 5 min) • Electrical Facilities (Dave – 15 min) • Hydrodynamic Analyses (Chris – 20 min) • Cost Analysis (Rick – 20 min) • Construction Management (Bob – 10 min)

3. Project Overview

4. Project Purpose • Provide temporary, cost-effective, immediate protection to delta smelt and other sensitive aquatic species from entrainment in SWP and CVP facilities • Designed and planned to have the flexibility to be operated to test alternative water management and fish protection strategies

5. Project Objectives • Achieve equivalent or reduced entrainment of delta smelt compared to OCAP BO RPA restrictions while providing SWP and CVP water supply benefits • Collect and evaluate data needed to determine whether it would be beneficial to install permanent operable gates to achieve Project purposes over a longer time period

6. Goals • Reduce the entrainment of delta smelt and other sensitive aquatic species while minimizing impacts on other aquatic and terrestrial resources • Improve SWP and CVP water supply reliability by reducing the potential for operational restrictions • Allow the passage of recreational and commercial vessels on Old River and Connection Slough in a safe and timely manner • Provide cost-effective, interim facilities that are immediately implementable and operationally flexible

7. Key Design Criteria • Allow the passage of recreational and commercial vessels on Old River and Connection Slough in a safe and timely manner • Provide design and operational flexibility for a broad range of demonstration operations

8. Design Overview

9. Project Location

10. Access and Accessory Facilities

11. Barge-Gate Transported to Site

12. Barge-Gate Being Positioned

13. Barge-Gate Floating & Ballasted

14. Barge-Gate with Locking Fill

15. Barge-Gate with Sheetpile Dike

16. Old River Facility Layout

17. Old River Dredging & Fill Plan

18. Old River Sheet Pile Dike Plan

19. Boat Ramps Plan Levee slope • Pile supported Top of levee • Boat portage during daylight hours Boat Ramp

20. Connection Slough Layout

21. Connection Slough Dredging & Fill Plan

22. Disposal Plan

23. Quantity Analysis

24. Progress to Date • Operations development and refinement based on extensive hydrodynamic modeling • Draft CEQA/NEPA documents • Draft Biological Assessment • Draft Permit Applications • Completed Pre-qualification Process • 4 firms solicited • 2 submitted SOQ’s • Dutra selected as ‘most qualified’ • Final design complete • RFP Issued to Dutra • Addenda’s #1 and #2 issued to Dutra • Responded to Dutra RFI • Proposal due Wednesday, October 28th

25. Construction Phasing and Schedule • Gate Barge Fabrication Nov ‘09 – Aug ‘10 • Site Prep & Dredging Jun ‘10 – Nov ‘10 • Barge Installation Aug ‘10 – Oct ‘10 • Completion in Water 22 Oct ‘10 • Operationally Functional 8 Nov ‘10

26. Design Criteria

27. Design Philosophy • Barriers will significantly reduce, but not stop all flow • Gates and barriers not permanent – removable • Gates will permit all normal vessel traffic, when open • Gates operable at any time • Design strength and stability of gates for “reasonable” flood risk levels

28. Design Criteria • Gates Closed • Not an impermeable barrier • Gates Open • Maintain flood neutrality • 100-yr flood stage increased by <0.1-ft • Water surface elevations <100-yr flood stage will not be increased to a stage >100-yr flood • Navigation Openings • Old River – 75 ft clear width • Connection Slough – 60 ft clear width • Design Vessel Draft – 10 ft min. • Design Head • For Gate Design – 3.60 ft when closed • For Sheet Pile Barrier • Old River - 3.60 ft • Connection Slough - 0.84 ft (minimum)

29. Design Criteria Discussion • Gates Closed • Not an impermeable barrier [as designed, very effective c.f. rock] • Gates Open • Maintain flood neutrality • 100-yr flood stage increased by <0.1-ft [achieved] • Water surface elevations <100-yr flood stage will not be increased to a stage >100-yr flood [achieved] • Navigation Openings • Old River – 75 ft clear width [derrick & other barges] • Connection Slough – 60 ft clear width [acceptable with OR gate] • Design Vessel Draft – 10 ft min. [ok leisure craft and barges]

30. Design Criteria Discussion (con’td) • Design Head • For Gate Design - 3.60 ft when closed • Old River 1 event in 15 yrs • Connection Slough exceeds 100 yr event, but enables relocation • For Sheet Pile Barrier - when gates are closed • Old River - 3.60 ft [1 event in 15 yrs ] • Connection Slough - 0.84 ft [1 event in 15 yrs ] • Design Head – Rationale • “Gates closed” head at Old River • 1 event in 15 years, or about 30% risk in lifetime • BUT the gates are operated to an agreed prescription which reduces this risk considerably, with the opportunity to manage head in extreme conditions, by: • Closing/opening gates • Adjusting the pumping rate

31. Design Elements

32. Geotechnical Summary

33. Soils at Connection Slough

34. Levee and Submerged Sheetpiles

35. Connection Slough Sheetpile Wall

36. Soils at Old River Abutment

37. Levee Sheetpiles at Old River

38. River Sheetpiles at Old River

39. Foundation Design

40. Barge-Gate with Sheetpile Barrier

41. Old River Dredging & Fill Plan

42. Connection Slough Dredging & Fill Plan

43. Foundations - Barge • Overturning Stability • Extreme F. of S. > 1.3 (spud piles available to assist) • Sliding Stability • Extreme F. of S. > 1.5 (spud piles available to assist)

44. Barge & Gate Design

45. Barge Design & Installation Method

46. Barge-Gate In Position

47. Barge-Gate Locating Piles In

48. Barge-Gate Being Lowered

49. Barge-Gate in Resting Position Friction Collar

50. Gate Design