Gravity Pipeline Mandatory Pre-SOQ Meeting April 26, 2017 Regional Environmental Sewer Conveyance Upgrade
Agenda • Introduction and RESCU Overview • Gravity Pipeline Project • RFQ/RFP Process Overview • RFQ Sections • Addenda/RFP/Next Steps • Site Visits and Available Information • Additional Questions (Please ask throughout)
Introductions and RESCU Overview • Introductions (Org Chart) • SVCW • RESCU Program • Sign-in Sheet
Owner’s Progressive Representative Teresa Herrera Design Build Operations & Maintenance Organization Financial Legal Chart Environmental CEQA Front of Plant Gravity Pipeline Project Manager Project Manager Bill Bryan Bruce Burnworth Owner’s Advisor Owner’s Advisor Brown & Caldwell Kennedy Jenks/COWI Regional Environmental Sewer Conveyance Upgrade Quality Assurance Quality Assurance Tanner Pacific Tanner Pacific Progressive Design Progressive Design Builder Builder To be determined To be determined
REDWOOD BELMONT CITY SAN CARLOS MENLO PARK EMERALD HILLS WEST BAY SANITARY DISTRICT WOODSIDE
Front of Plant Selected Alternative
Gravity Pipeline Project – Overview • Need for Project • Alternatives Considered • Project Success Factors and Objectives • Current Project Concepts – EPB TBM 15’ OD, 17,600 feet long – 100 year Service Life – Diurnal and Seasonal Equalization • Initial Focus Areas • Status of EIR, Permits and Easements • Availability of SVCW Funding
Problem we need to Solve 4 pump stations with a Booster Pump Station and Influent Lift Pumps Joints every 12’ in RCP Force Main thru YBM Design useful life = 25 to 50 years (ASCE; EPA) Pipe is 45 years old Currently operating at 2.5 times design pressure 64 leaks so far; rate of failure is increasing Leaks are time-consuming, disruptive and expensive to repair . . . potentially catastrophic.
Pipe cracked (not a joint separation) Raw sewage flowing from separated and offset joint
Adjacent to airport . . . valve bonnet blew off . . . . . . raw sewage into the air
Major Failures Corrosion + Surge
Numerous Alternatives Considered 2014/2015 2013/2014 Microtunnel (deep) Open Cut in Street Tunnel Boring Machine (deep) Open Cut in Levee From SVCW Plant Lay in Slough From near Airport Lay in Lagoon Sliplining (w/ bypass) Microtunnel (shallow) Parallel Smaller Pipes Pipe Bursting (w/ bypass) Pipe Splitting (w/bypass) Swege (w/bypass) Replace in place (w/bypass)
Front of Plant Selected Alternative
RESCU Success Factors “Success” - collaboratively implementing an appropriate balance of the following: • Cost: Provide a complete functional conveyance system that meets the goals of the Program at the lowest practical capital and lifecycle cost . • Operations: Produce projects that are easy, efficient, and effective to operate . • Maintenance: Produce projects that minimize required maintenance . • Safety: Implement projects that are safe to construct, operate, and maintain. • Schedule: Place new wastewater conveyance system projects into operation with best practical safe speed , while maintaining the present level of service with existing facilities. • Stakeholder Impacts: Solicit, evaluate, and respond to stakeholder’s concerns, and implement a Program that best meets the combined needs of stakeholders while reaching the Program’s goals .
Gravity Pipeline Project Objectives • Quality : Provide a gravity pipeline that will be sustainable over 100 years and will reliably receive, convey and equalize wastewater flows ranging from 2 mgd to 103 mgd in full compliance with environmental requirements. • Cost: Provide a complete functional gravity pipeline and inlet facilities that meet the goals of the Project at the lowest practical capital and lifecycle cost . Provide early and ongoing total Gravity Pipeline cost predictability . • Schedule : Achieve the best practical safe speed to complete the tunnel and inlet structures so that the existing failing pipeline and pump stations can be taken out of operation as early as reasonably possible. • Risk: Generally assign to the Design-Builder the risks that the Design-Builder can reasonably anticipate and control . Assign to SVCW the risks that the Design-Builder cannot reasonably anticipate and control. • Safety: Implement an effective safety program incorporating better than industry practices . • Accountability : Design-Builder to provide for a single point of accountability for performance of all services under Stage 1 and Stage 2. SVCW to provide a single point of accountability for all direction to the Design-Builder. • Collaboration : Implement an integrated design process that collaboratively includes SVCW management, engineering, operations and maintenance as well as the Design-Build contractor and engineer to develop a design that optimally achieves SVCW success factors and Gravity Pipeline requirements . • Innovation : Apply proven technology from other locations to uniquely achieve Gravity Pipeline goals .
Current Project Concepts • SVCW will share all of the studies and alternatives developed to-date • Ongoing work related to concrete and odor/corrosion modeling • We expect to work collaboratively with the PDB during Stage 1 to refine, revise or change our preliminary concepts to best meet SVCW objectives
“60% Permit Plans” – RLS Shaft
• Receiving Lift Station Front of Plant Facilities • Headworks – Screens – Grit Removal • Influent Connection Pipe to WWTP • Odor Control • Electrical Power Infrastructure • Civil Site Work Odor Control 10 AC Site Headworks Receiving Lift Station Electrical Infrastructure Front of Plant
Site Preparation completed under separate DBB in 2017/early 2018 • Lime stabilized areas • Roadway Improvements • Construction Fencing • Grading & Stormwater Drainage
RLS Shaft
Receiving Lift Station
RLS Shaft
Airport Access Shaft
Airport Access Shaft
San Carlos Drop Structure
San Carlos Drop Structure
“60% Permit Plans” – Bair Island Inlet
Bair Island Inlet Structure
Bair Island Inlet Structure
Alignment
Governors Bay Alignment
Easement Acquisition
Pulgas Creek
Geologic Profile
Conceptual Flow Conditions • Currently dry weather flows into plant vary daily from ~ 2 mgd to 23 mgd • Currently peak storm flows into SVCW interceptors are about 100 mgd • Future average flows will increase from ~12 mgd to 18 mgd with peak storm flows remaining ~103 mgd • Gravity Pipeline flow equalization into WWTP – Dry weather diurnal flows ( constant ~10-13 mgd ) – Wet weather equalization ( max.~60mgd ) – Wet weather equalization appears feasible with 11’ ID pipeline and use of Drying Bed A or 13’ ID pipeline alone
Hydraulics Design Storm Equalization Diurnal Equalization San Carlos Drop Structure
Conceptual Hydraulic Gradeline
Early Focus • Project cost and schedule reduction • RLS Shaft configuration and size (FoP lead) • 100 year life approach to corrosion protection • Launch shaft – possibly Bair Island • Stage 2 phasing – possibly TBM, Segments, Launch Shaft
RLS shaft – coordination with FoP
Corrosion Protection Alternatives • Two Pass – FRP in tunnel – HDPE lining • One Pass – HDPE lined segments • Field weld • Combisegments – Multiple layers of defense • Upstream dosing • Water and air flow • Special concrete • Monitoring
100 year life: Ongoing Efforts • Concrete mix modeling and batch testing (CTL) • WATS Model to address biological, chemical, biochemical and physical variables affecting sewer odors and corrosion (Aalborg Univ.)
CTL Concrete Mix Modeling and Batch Testing • C oncrete T esting L aboratory – Research and Consulting arm of Portland Cement Association • Modeling of concrete mixes to achieve 100 yr life • Batch testing to determine relative resistance to H 2 SO 4 (using low water content, Metakaolin, fly ash, etc.)
WATS Model for Odors/Corrosion • W astewater A erobic/anaerobic T ransformations in S ewers • Developed over 30 years at Aalborg University, Denmark • In use around the world including SFPUC • Computer simulation of a matrix of non-linear differential equations and Monte Carlo simulations • Includes all relevant biological processes, chemical and physical processes, inter-phase mass transport as well as wastewater and air hydraulics
Timing of CTL and WATS • Ongoing effort • Possible RFQ addendum with more information • Interim deliverables in October 2017 • Collaborative effort with PDB after October
Project Cost and Schedule • Reduce GP project cost by more than $40 million • Reduce GP project schedule by more than a year • Achieve 100 year service life • Achieve diurnal and wet weather equalization
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