Lessons Learned from Walla Walla: Eastern WA s Largest GC/CM Water Project

Transcription

1 Lessons Learned from Walla Walla: Eastern WA s Largest GC/CM Water Project Pierre Kwan, PE HDR Frank Nicholson, PE City of Walla Walla Amy Jenne Apollo, Inc PNWS-AWWA Conference

2 Background GC/CM Process Benefits and Constraints Looking Forward

3 Background City of Walla Walla Approx. Population 32,000

4 Background City of Walla Walla Mill Creek WTP First constructed in 1920s o Sedimentation only Last major expansion in 1998 o LT1ESWTR compliance o Added ozonation system after sedimentation basins unfiltered system 24 MGD capacity Mill Creek surface water Groundwater from eight wells

5 Existing Process

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7 Background New Treatment System LT2ESWTR compliance for Cryptosporidium. Adding 24 MGD UV system Calgon Carbon med. pressure reactors. Removing ozone system and expanding admin area. Adding an upflow roughing filter for suspended solids removal.

8 Background New Treatment System Upgrading gas chlorine system. Upgrading high service pump station. Adding a hydrogen peroxide feed system. Upgrading I&C at plant, intake, and all the wells. And much more.

9 Walla Walla WTP site

10 Add slide for site 3D model

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12 Project Delivery Process (GC/CM in Washington, CM/GC in Oregon, everywhere else) Original intent was design-bid-build o Comfortable, known project delivery for City Looked at alternative delivery GC/CM, D/B, DBO Selected GC/CM o More Owner control than D/B, DBO o More contractor interaction for pre-construction services than D-B-B o WTP upgrade is complex Lots of construction trades involved Plant has to keep running orisk reduction not cost reduction

13 Washington GC/CM Process State of Washington requires state approval through Department of Enterprise Services Capital Projects Advisory Review Board (CPARB). CPARB application packet. o Management o Funding o Design concepts If packet is accepted, then interview at CPARB meeting in Olympia. Permission only granted after successful interview. Process takes about four to six months.

14 Washington GC/CM Process After approval, process governed by Revised Code of Washington (RCW) Project generally must be $10+ million in construction. GC/CM contractor limited to 30% self-perform (or 70% for heavy civil) Additional requirements on top of any loan or regulatory requirements. o Additional paperwork tracking o Coordination with another agency.

15 After Approval Need to go find a GC/CM. July 2014 January 2015 (seven months) City issued a RFP for the GC/CM Three stage process o Initial proposal o Interview o Final proposal

16 Scoring Big Numbers! No. Evaluation Criteria for Proposals Maximum Points 1 Qualifications of Proposer / Proposed Team Structure 50 2 Past performance and experience with negotiated and complex projects including GC/CM, CM/GC, and CMAR projects Qualifications and Past Experience of Key Personnel Past Experience and Performance of the Proposer Proposer s Approach to Executing the Project Proposer s Ability to Meet Time and Budget Requirements 70 7 Proximity to the Project and Subcontracting 30 8 Workload including recent, current and projected workloads of the firm 50 9 Scope of work the firm proposes to self-perform and ability to do so 50 Total for Proposals: 1, Interview Final Proposal 500 Total for Selection Process: 2,000

17 GC/CM Apollo, Inc of Kennewick Cost estimating and cost reconciliation Constructability reviews Scheduling and sequencing Value engineering/value analysis and cost tracking Subcontracting plan Control systems/construction planning Early bidding

18 Contracting City is managing four contracts through the design phase. o Designer o Owner s Advisor o GC/CM pre-construction services contract o UV equipment procurement More paperwork, more coordination needed

19 Benefits Better understanding of construction costs and variances. Improved understanding of construction schedule and sequencing. Constructability reviews. Value engineering and analysis.

20 Constraints Many more subcontractors during construction Management of multiple contracts during design Requires greater understanding of construction activities and sequencing. Overall unfamiliarity with GC/CM in the state.

21 Looking Forward Council Approved Construction Contract in April Construction contract $16.6M Design complete June 2. July 2017 break ground. Construction schedule completed by January 9, 2019

22 Lessons Learned from Walla Walla: Eastern WA s Largest GC/CM Water Project Pierre Kwan, PE pierre.kwan@hdrinc.com, Frank Nicholson, PE fnicholson@hdrinc.com, Amy Jenne Apollo, Inc. amy.jenne@apollo-gc.com,