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File #: 2019-425    Version: 1 Name:
Type: Resolution Status: Passed
File created: 12/3/2019 In control: Board of Directors
On agenda: 12/19/2019 Final action: 12/19/2019
Title: Proposed Amendment No. 2 Contract No. GLWA-DB-150 Design-Build Repair for Portions of the Pennsylvania, Springwells and Northeast Raw Water Tunnels CIP#: 116002
Sponsors: Cheryl Porter, Todd King
Indexes: Water Operations
Attachments: 1. Water and Sewer Tunnel Project Status and Conner Freud Pump Stations 11.13.pdf
Related files: 2019-398

Title

Proposed Amendment No. 2

Contract No. GLWA-DB-150

Design-Build Repair for Portions of the Pennsylvania, Springwells and Northeast Raw Water Tunnels

CIP#: 116002

Body

Agenda of:                     December 19, 2019

Item No.:                     2019-425

Amount:                     Original Contract                                                                                     $10,702,047.28

                                          Amendment No. 1                                                                                                                0.00

                                          Proposed Amendment No. 2                                            83,875,430.00

                                          Total Contract Amount                                                               $94,577,477.28

 

TO:                                          The Honorable

                                          Board of Directors

                                          Great Lakes Water Authority

 

FROM:                     Sue F. McCormick

                                          Chief Executive Officer

                                          Great Lakes Water Authority

 

DATE:                     December 3, 2019

 

RE:                                          Proposed Amendment No. 2

                                          Contract No. GLWA-DB-150

                                          Design-Build Repair for Portions of the Pennsylvania, Springwells
                                          and Northeast Raw Water Tunnels

                                          Vendor:  Ballard Marine Construction, LLC

 

 

MOTION

Upon recommendation of Cheryl Porter, Chief Operating Officer - Water and Field Services, the Board of Directors (Board) of the Great Lakes Water Authority (GLWA), authorizes the Chief Executive Officer (CEO) to enter into Contract No. GLWA-DB-150 Amendment No. 2 “Design-Build Repair for Portions of the Pennsylvania, Springwells and Northeast Raw Water Tunnels” with Ballard Marine Construction, LLC, at an increased cost of $83,875,430.00 for a total cost not to exceed $94,577,477.28 and an increased duration of 1,860 days for a total contract duration of 2,501 days; and authorizes the CEO to take such other action as may be necessary to accomplish the intent of this vote. 

 

BACKGROUND

The inspection work conducted under CS-1623 “Inspection, Condition Assessment and Engineering Evaluation of Raw Water Intake Tunnels and Related Facilities,” indicated that four sections of the Pennsylvania, Springwells and Northeast Tunnels required repairs.  The four sections, ranging in length from 60 to 400 lineal feet, require repairs to address cracking that could result in soil infiltration.  Left unaddressed, soil infiltration could result in raw water tunnel failure and result in loss of service for extensive portions of the GLWA water service area. The design-build project delivery method was selected over the traditional design-bid-build project delivery to encourage a broader range of approaches (wet versus dry repairs) to be developed for consideration by GLWA that balances risk to operations versus costs.

The scope of this project was to assess the damage to designated sections of the tunnel as identified in the draft CS-1623 report using the available video, inspection and subsequent geotechnical information. From the available information, the Design-Build (DB) Team conducted a gap analysis to identify data needs and developed and conducted the work necessary to complete the design and construction of repairs to the tunnel.  In addition, an array of design alternatives were developed that allowed GLWA to select a preferred approach that considered bypass, dry, and wet repair options. The selected alternative provided for a wet repair of the tunnel with stainless steel inserts for the Springwells and Northeast repairs and crack repairs for the Pennsylvania portion of the tunnel.

The original budget for this work, based on the findings of the CS-1623 work was $30 million.  The following table highlights the differences between the original and current scope of work:

                                                                                    Original                                          Current                            Estimated Costs
Scope Item                                                               Scope                                          Scope                            (without allowances)

Springwells Tunnel                                          270 lineal feet                     755 lineal feet     
Repairs                                                               (2 locations)                                          (combined)                     

Pennsylvania Tunnel                     225 lineal feet                     225 lineal feet      $44 to 51.4 million
Repairs                                                                                                                                                                        

Access Shafts to                                          Temporary                                          Permanent
complete work                                                                                                                                                                                                                                       

Northeast Tunnel                                          400 lineal feet                     500 lineal feet                     $21 to 25.5 million                     

 

 

 

Based on the negotiation of the proposed production dependent guaranteed maximum price (PDGMP), we are recommending approval of Ballard Marine to complete this work. The key economic considerations are as follows:

                     Base Bid                                                                                    $65,000,000.00

                     Production Contingency                                              9,000,000.00

                     Cash Allowance                                                                   1,875,430.00

                     Provisional Allowance                                              8,000,000.00

                     Total This Change Order                                          $83,875,430.00

                     Phase I Work Amount                                            10,702,047.28

                     Total Contract Upper Limit                                          $94,577,477.28

The production contingency is negotiated unit rate work that will provide for the automatic adjustment of authorized work, should the assumptions used in the development of the work productivity rate or cost of materials for the base bid vary prior to the completion of the work. This risk-sharing approach was used to fairly compensate the vendor, and control GLWA costs from a negotiated change order, recognizing the uncontrollable factors associated with underwater construction.

In addition, an early completion incentive is proposed to define cost sharing benefits between GLWA and the vendor should the project be completed earlier than anticipated in the base bid. The incentive is capped at $6.5 million (10 percent of the base bid) and further structured as follows:

                     Project completed at…                                                               Incentive paid to Ballard at…

                     15% or more below Base Bid                                          40-percent of savings, up to cap

                     10% to 15% below Base Bid                                          30-percent of savings

                     5% to 10% below Base Bid                                          15-percent of savings

                     5% below Base Bid or less                                                               No incentive paid to Ballard

The incentive structure will ensure that the vendor and GLWA appropriately share in the savings that will be realized if the work is completed ahead of the budgeted costs.

 

 

JUSTIFICATION

The Pennsylvania, Springwells, and Northeast tunnels convey over half of the raw water supply treated and supplied to the GLWA system.  Due to the size and depth of these tunnels, a failure at any of the identified, stressed locations could result in severe disruption to the overall capacity of the GLWA water system. The distress and cracking observed in all three tunnels warrants an accelerated design-build project delivery to combine the investigation, engineering and construction services to define, design and implement the repairs.  These repairs are necessary to assure the structural integrity of the tunnels and minimize the potential for collapse. These tunnels are the sole supply of raw water to two GLWA water treatment plants. A failure of the Pennsylvania tunnel would cause major disruption of water service to most of GLWA’s service area. Similarly, a failure of the Springwells and Northeast tunnels would cause major disruptions of water service to member partner communities along with associated institutions, medical facilities, and industries that depend on reliable water supply. Therefore, the repair of these tunnels is necessary to mitigate known issues and assure the integrity of these assets.

PROJECT MANAGEMENT STATUS

Original Contract Time                                           365 Days

Amendment No. 1                                                               276 Days

Proposed Amendment No. 2                     1,860 Days

New Contract Time                                                                2,501 Days

PROJECT ESTIMATE

Original Contract Price                                           $10,702,047.28

Amendment No. 1                                                                                           0.00

Proposed Amendment No. 2                               83,875,430.00

New Contract Total                                                                $94,577,477.28

 

 

 

FINANCIAL PLAN IMPACT

Summary: Sufficient funds are provided in the financial plan for this project.              

Funding Source: Water Construction Bond

Cost Center: Water Engineering

Expense Type: Construction (5519-882111.000-616900-116002)

Estimated Cost by Year and Related Estimating Variance:  See table below.

                                                                                                                                                     Contractor’s                     Estimating                     

Fiscal Year                                                                                     CIP Plan        Projection                                          Variance

FY 2020 Budget                                                               $ 5,346,000   $ 5,000,000                                          $     346,000                                          

FY 2021 Budget                                                                  5,346,000                        5,500,000                                             (   154,000)

FY 2022 Budget                                                                  5,346,000                      14,000,000                                             (8,654,000)                     

FY 2023 Budget                                                        3,878,000                       24,000,000                                 (20,122,000)

FY 2025 Budget                                                            -0-           27,000,000                                           (27,000,000)

FY 2024 Budget                                                                       -0-             8,375,430                                             (8,375,430)                     

  Total                                                                                             $19,916,000                     $83,875,430                               $(63,959,430)

The Board approved 2020-2024 CIP Plan provides sufficient planned spend for the current fiscal year.  Draft version of the 2021-2025 CIP Plan provides an increased plan spend in the amount of $30,619,000 for the construction phase, bringing the life-to-date construction phase total for the project to $60,689,000.   Future CIP Plan iterations will address the remaining estimating variance of $33,840,000.                                                                                                           

COMMITTEE REVIEW

This item was presented to the Operations and Resources Committee at its meeting on December 11, 2019. The Operations and Resources Committee unanimously recommended that the GLWA Board adopt the resolution as presented.

SHARED SERVICES IMPACT

This item does not impact the shared services agreement between GLWA and DWSD.