Liquid Waste Coordination Committee

Transcription

1 Annacis Island Wastewater Treatment Plant Outfall Project Liquid Waste Coordination Committee FOR LWCC BY KEN MASSÉ. 19 JANUARY 2017 Ken Massé, P.Eng. METRO VANCOUVER April 3, 2017 CONTRACTOR INFORMATION SESSION John Newby, P.E. CDM SMITH

2 INTRODUCTIONS Metro Vancouver Project Delivery Division of the Liquid Waste Services Department Ken Massé & Nancy Bonham Purchasing: Gary Mui CDM Smith (Design Engineering Consultant) John Newby Hatch (Construction Manager) Tim Langmaid, 2

3 AGENDA Metro Vancouver Project rational, requirements and overview Permitting & property Project details, construction challenges Insurance, bonding, safety requirements Pre-qualification Schedule Questions 3

4 METRO VANCOUVER REGIONAL DISTRICT Annacis Outfall Project 4

5 Annacis Island Wastewater Treatment Plant 5

6 Existing Outfall

7 Existing Outfall 7

8 REQUIREMENTS FOR THE NEW OUTFALL 1. Capacity to discharge 25.3 m 3 /s 2. Dilution ratio of 20:1 in the river at slack tide 3. Remain operational after an earthquake ( Post-disaster performance level) 8

9 Chlorine Contact Tanks Diffuser Manifold 9

10 Launch Shaft 10

11 SEISMIC RESILIENCY New Stage 5 Clarifiers 11

12 Post-Disaster Bypass Conduit to Outfall (PDBCO) PDBCO New Stage 5 Clarifiers 12

13 Post-Disaster Bypass Conduit to Outfall (PDBCO) Deep, tunneled section PDBCO New Stage 5 Clarifiers Shallow buried section 13

14 The Outfall Construction Contract 14

15 REGULATORY & PERMITTING ISSUES Port of Vancouver Ministry of Environment (MoE) Ministry of Forest, Lands & Natural Resources Operations (FLNRO) Department of Fisheries & Oceans (DFO) Transport Canada Corporation of Delta Environment and Climate Change Canada 15

16 DISPOSAL AT SEA Contractor may opt to dispose the dredged material at sea Requires permit from ECCC (contractor to obtain) Permit requires sampling of the sediment prior to dredging MV conducting the sediment sampling 16

17 PROPERTY & RIGHT OF WAY Launch Shaft and Future Effluent Pump Stn Property Purchase 17

18 Design Decisions / Drivers Hydraulic gradient River bathymetry and geomorphology Seismic ground displacements Minimize impacts on the surrounding community 18

19 Project Setting 19

20 Annacis Island WWTP Setting 20

21 Subsurface Conditions 21

22 Diffuser Location Fraser River Setting Navigation Channel 22

23 Diffuser Location River Bathymetry and Geomorphology 23

24 Diffuser Location 24

25 Maximum Minimum Actual Fisheries Closure Fraser River Flow 25

26 Fraser River Currents 26

27 Item Elevation GD (m) Chart Datum Description Chlorine Contact Tanks Maximum Stage VIII water surface elevation in CCTs Design River Stage Design river level, 200-yr peak winter flood level High Water High water datum at Alex Fraser Bridge Geodetic Datum (GD) CVD28GVRD Geodetic Datum Chart Datum Per Port of Vancouver; varies +/ m across area Dredging Grade Navigation channel minimum depth +/ m Dredging Subgrade Maintenance dredging elevation +/ m Elevations / Water Depth 27

28 Project Elements 28

29 Project Main Elements CCTs / Level Control Structure Effluent Shaft and Effluent Tunnel PDBCO Shaft and PDBCO Tunnel Outfall Shaft and Outfall Tunnel Riser Shaft and River Diffuser Future Effluent Pump Station 29

30 Overview of System Hydraulics 30

31 Level Control Structure 31

32 Click here to view animation : 32

33 Click here to view animation: 33

34 Level Control Structure Gate Details 34

35 Treatment Plant Shafts 35

36 Shaft Details Outfall Shaft Serves as tunnel launch shaft 16 m final ID; m deep 3.75 m thick base slab Effluent and PDBCO Shafts Serve as tunnel receiving shafts 7 m final ID; m deep 2.25 m thick base slab 36

37 Shaft Excavation Support Water-tight (No GW drawdown allowed) Independent of permanent structure Slurry wall technology (assumed) ~ 1,220 by 3,000 mm panels 56.5 m total panel depth Contractor options: Alternate support technologies Larger ID (> finished ID + 2 m) 37

38 Excavation and Base Slab Excavation Method In the Dry Slurry wall depth selected for base stability Contractor to confirm suitability for alternate technology Contingency plan for tremie method, if conditions require Base Slab / Breakout Structure Base slab reinforced with shear key into slurry walls Launch shaft design includes breakout structure External 12+ m ground improvement zone around tunnel alignment 38

39 Final Lining and Top Structure Reinforced Concrete Lining 1.0 m thick Additional 1.5 m thick dividing wall in Outfall Shaft Top Structure Level control structure above Effluent Shaft + pile support Buried conduit connection on PDBCO Shaft Pre-cast Panels on Outfall Shaft for future pump station 39

40 Conveyance Tunnels 40

41 Tunnels Tunnel Dimensions 4.2 m finish ID Effluent Tunnel (220 m) PDBCO Tunnel (410 m) Outfall Tunnel (580 m) TBM Requirements Pressurize face (EPB or SPB) New or manufacturer reconditioned Allow for some oversize for machine selection 41

42 Tunneling Ground Conditions Fraser River Sands Flowing ground conditions w/ unsupported face Face pressure / excavation volume control critical EPB: Muck conditioning to control and for minimizing tool wear/abrasion SPB: Slurry line and plant sand removal critical, wear/abrasion significant Deformation Monitoring / Geotechnical Instrumentation Structural settlement monitoring in advance of construction Surface settlement points Multi-point borehole extensometers Utility monitoring points 42

43 Precast Segmental Lining Concrete segments 254 mm (10 in.) thick by 1,510 mm (5 ft.) Drawings present preliminary design Contractor to prepare final design for means and methods Secondary Lining Typically first 30 m from shafts, maybe longer in Outfall Tunnel 3,820 mm ID; 25.4 mm thick w/ 50 mil PE lining Tunnel weld one-side with backing plate 43

44 River Riser and Diffuser 44

45 Riser and Diffuser 45

46 River Riser Requirements Safe Haven for tunnel completion Resistance to lateral forces Seal against water pressure Temporary excavation support Independent of permanent structure Drawings prepared assuming combi-wall technology Contract to allow for contractor selection of alternate Must provide separation of internal work area from river 46

47 Click here to view animation: 47

48 Diffuser Pipeline Pipeline Requirements Accommodate post-disaster deformation Buried in river bed with armor rock protection Installation Requirements Shop assembly in sections (welding / PE coating) Installed in sections (bolted flanges) Clam shell dredging At-sea or on-land disposal Contractor options to limit dredging / back fill 48

49 Dredge Prism 49

50 Diffuser Riser Cross Section 50

51 Existing Outfall 51

52 Existing Outfall Will continue to serve as influent emergency bypass Cleaning and repair Installation of duckbill ports 52

53 Construction Area 53

54 Outfall Contract Construction Site Limits 54

55 2019 Construction Site Plan 55

56 Site Preparation Contract Site Preparation Building demolition Utility relocation Gravel surfacing Construction Power On-Site 2 MVA power substation (12.4 kv and 600 V) Contractor provided generation (diesel or natural gas) for TBM 56

57 Site Access Tunnels, Outfall Shaft, Effluent Shaft Truck access via Derwent Way and Eaton Place Worker parking near north access gate PDBCO Shaft Truck access via Cliveden Avenue and Eaton Way River Riser and Diffuser Barge access via Fraser River Off-site staging/assembly/parking provided by contractor 57

58 2.0 PDBCO Shaft 3.4 Acres Tunnel Launch Shaft Site Limits 58

59 Riser and Diffuser Construction Site Limits 59

60 Excavation and Dredge Spoil On-Land Sites Disposal via truck to contractor selected land-disposal site Native soil and groundwater analytical data provided in contract Other disposal site requirements to be met by contractor River Riser and Diffuser Site Disposal via barge to at-sea or offloading/land-disposal site Native dredge material analytical data provided in contract Other disposal site requirements to be met by contractor 60

61 Schedule 61

62 Design and Tender Schedule Q1 2017: 60% Design Complete Q3 2017: RFQ Issued Q3 2017: 90% Design Complete Q1 2018: 100% Design Complete, RFP Issued, Site preparation start Q4 2018: Site preparation complete Q1 2019: New Outfall System contract NTP 62

63 Construction Schedule 63

64 INSURANCE REQUIREMENTS Commercial General Liability (CGL) Insurance for at least $10 million per occurrence (including coverage for underground shaft and tunnel work, and in-river work) additional insureds: Greater Vancouver Sewerage and Drainage District, Metro Vancouver Regional District, Vancouver Fraser Port Authority, Her Majesty the Queen in right of Canada, Southern Rail of British Columbia 64

65 INSURANCE Continued Automobile Liability Insurance - $5 million per occurrence Contractor s Pollution Liability Insurance - $5 million per occurrence or claim (additional insureds as in the CGL insurance) Marine Liability Insurance - $5 million per occurrence (additional insureds as in the CGL insurance) Course of Construction Insurance - For the dollar value of the contract Contractor s Equipment Insurance (including tunnel boring equipment) 65

66 BONDING REQUIREMENTS Bid Bond 10% of the dollar value of the tender price Performance Bond - 50% of the dollar value of the contract Labour and Materials Bond - 50% of the dollar value of the contract 66

67 WORKSAFE BC REQUIREMENTS Must be a registered employer Clearance Letter Prime Contractor designation 67

68 PRE-QUALIFICATION Contractors to demonstrate experience & qualifications in: Tunneling and Shafts in similar conditions Marine works of similar scope Request of Qualifications (RFQ) ~ Q Target completion of pre-qualification process ~ Q

69 REQUEST FOR PROPOSALS Pre-qualified contractors will be invited to submit proposals Evaluated on technical and financial criteria RFP Late Q Target for Notice to Proceed: Early Q

70 GENERAL CONDITIONS & RISK Metro Vancouver s Standard General Conditions Supplemental Conditions to address tunneling issues such as Differing Site Conditions, Dispute Resolution Board, & Escrow documents RFP will include: Geotechnical Data Report Geotechnical Baseline Report 70

71 QUESTIONS? Outside of today s session, send questions to: Gary Mui, Buyer, Metro Vancouver Purchasing Gary.Mui@metrovancouver.org 71