SWSC Bid No. 26-25 Addendum No. 2.pdf

IFB No. 26-25 Addendum No. 2

Addendum No. 2, IFB No. 26-25

Cobble Mountain Unit 3 Valve Replacements

Date of Addendum: February 18, 2026

General Bid Opening Date: 2:00 P.M. May 8, 2026

Sub Bid Opening Date: 2:00 P.M. April 24, 2026 To Whom It May Concern:

This is an addendum to the above IFB. Special attention should be given to this addendum to preserve the validity of any bids submitted in response to this request. All Addenda must be acknowledged by indicating receipt on page 2 of Section 00300, Forms for General Bid (or Section 00310 Forms for Sub Bid).. Failure to acknowledge this Addendum may subject the Bidder to disqualification.

1. REVISIONS TO SPECIFICATIONS:

a. The Commission has corrected the specifications to include specific sections for the FSB categories of Plumbing and Electrical Work These sections were accidentally omitted from the original publication of the Project Manual.

b. Accordingly, bidders shall INSERT Section 22 01 00 – Plumbing (FSB) and Section 26 01 00 – Electrical Work (FSB), which have been incorporated into this addendum as Attachment 1 and Attachment 2 respectively, into the Project Manual.

c. In addition, bidders shall REMOVE the Table of Contents from Division 0 and REPLACE it with the revised Table of Contents which has been incorporated into this addendum as Attachment 3.

2. CLARIFICATION TO MANDATORY PRE-BID MEETING:

a. Some likely bidders have requested clarification of the details of the mandatory pre-bid meeting. The commission offers the following clarification:

“A mandatory pre-bid meeting has been scheduled for February 25th, 2026 at 10:00 AM. The pre-bid meeting will be held on-site starting at Springfield Water & Sewer Commission’s West Parish Filtration Plant, 1515 Granville Road, Westfield, MA. Meeting will commence in the main building lobby and then proceed to the Cobble Power Plant site. Due to parking limitations, a shuttle van will facilitate transport to the Power Plant. Visit

Sincerely, Edward J. Sweeney, Chief Procurement Officer Springfield Water and Sewer Commission may be broken into two or more groups depending on number of attendees Bidders are required to attend the pre-bid meeting in order to be able to submit a bid for evaluation. NOTE: for safety reasons, hard hats, safety glasses, steel toes, and high visibility vests are required of all attendees.”

b. Accordingly, bidders shall REMOVE Section 00012, Legal Advertisement (Newspaper) from Division 0 and REPLACE it with the revised Section 00012 which has been incorporated into this addendum as Attachment 4.

c. Accordingly, bidders shall REMOVE Section 00020, INVITATION FOR BIDS from Division 0 and REPLACE it with the revised Section 00020 which has been incorporated into this addendum as Attachment 5.

END OF ADDENDUM NO. 2 (not including attachments)

February 18, 2026

Addendum No. 2, IFB No. 26-25

ATTACHMENT #1

Cobble Mountain Revision D Unit 3 Butterfly Valve Replacement Date: February 9, 2026

10429200 PROJECT SCOPE OVERVIEW Springfield Water & Sewer Commission Cobble Mountain – Unit 3 Butterfly Valve

Replacement 22 01 00 - 1

SECTION 22 01 00

PROJECT SCOPE OVERVIEW (PLUMBING FSB)

PART 1 - GENERAL

1.1 GENERAL PROVISIONS

A. Attention is directed to the CONTRACT AND GENERAL CONDITIONS and all Sections within DIVISION 01 - GENERAL REQUIREMENTS which are hereby made a part of this Section of the Specifications.

B. Time, Manner and Requirements for Submitting Sub-Bids:

1. Sub-bids for work under this Section shall be for the complete work and shall be filed as stipulated in the "INSTRUCTIONS TO BIDDERS".

2. Each sub-bid submitted for work under this Section shall be filed as required by Section 44F of

Chapter 149 of the General Laws, as amended.

1.2 OVERVIEW OF COBBLE MOUNTAIN REFURBISHMENT PROJECT

A. The Cobble Mountain Hydropower Station, constructed in 1930, is operated by Holyoke Gas and Electric (HG&E) on behalf of the facility owner, Springfield Water and Sewer Commission (SWSC). The project is comprised of the Cobble Mountain Dam and reservoir, intake works, 7,000 feet of concrete and steel-lined tunnel, surge tank and valve house, three steel penstocks each measuring approximately 1,000 feet long, a powerhouse with three vertical Francis-type hydroelectric generating units, and a substation.

B. SWSC has determined it is time to refurbish/replace several major components including the Unit 3 Turbine and Generator, the Unit 3 Penstock Upper and Lower Isolation Butterfly Valves, install a carbon-fiber reinforced polymer (CFRP) liner in the Unit 3 penstock, perform powerhouse concrete repair work, and replace the powerhouse bridge crane. The outage for this work is anticipated to occur in 2028 and the Operator, HG&E will serve as the Owner’s Project Manager (OPM) to oversee all tasks.

The complete project Scope of Work is divided as follows, with the first bullet item being this contract:

• Cobble Mountain Unit 3 Butterfly Valves Replacement

• Cobble Mountain Unit 3 Turbine Generator Rehabilitation

• Cobble Mountain Unit 3 Penstock CFRP Liner

• Cobble Mountain Bridge Crane Replacement

• Cobble Mountain Electrical Modernization

C. Essential to successfully completing not only the Scope of Work included in this task but the project overall, all Contractors will be required to coordinate and collaborate with other Contractors and OPM, as required for use of common workspaces, crane usage, access, etc. Any schedule, space, resource, or other logistical conflicts anticipated by this Scope of Work’s Contractor (Valve Contractor) shall immediately be brought to OPM’s attention for resolution. Valve Contractor shall participate in periodic coordination meetings during on-site work to anticipate and resolve conflicts as they are identified.

D. SWSC is also interested in the refurbishment of the Unit 1 Butterfly Valves concurrently with Unit 3.

The scope for Unit 1 would be identical to the Unit 3 scope. Bidder to provide a Bid Alternate (Number

1) which includes the additional, optional scope items related to Unit 1. See Section 1.4 F for details.

1.3 OVERVIEW OF UNIT 3 BUTTERFLY VALVES REPLACEMENT

A. The Cobble Mountain Hydroelectric Station Unit 3 penstock includes two butterfly type isolation valves for plant operation. One is located in the powerhouse immediately upstream of the spiral case (Lower Isolation Valve) and the other is at the beginning of the Unit 3 penstock, just downstream of the surge tank and trifurcation (Upper Isolation Valve). The 72-inch diameter Lower Isolation Valve operates as a typical turbine shut-off valve (TSV) and is controlled by a double acting cylinder operated by headwater pressure. The 84-inch diameter Upper Isolation Valve operates as a typical penstock shutoff valve (PSV), is located in a valve house, and is electric motor operated with manual override.

Addendum No 2, Attachment No 1

10429200 PROJECT SCOPE OVERVIEW

B. The Upper Isolation Valve does not have a bypass line, and instead fills the penstock by locally and manually opening/cracking the valve approximately 10%. Once differential pressure across the valve has equalized, the valve controls continue to open the valve to full open position. The Lower Isolation Valve does include a bypass line, utilized for filling the scroll case and turbine to balance head across the valve, prior to opening it. The lower valve is under higher hydraulic pressure.

C. Both valves are OEM equipment (1930’s vintage) and have been reported to leak excessively. The valve exteriors are corroded and there are concerns with the reliability of both valve actuators. Both valves have been identified as having exceeded their reliable design life. The goal of the modernization efforts included in this Scope of Work is to procure and install replacement Upper and Lower Isolation Valves, hydraulic cylinders and hydraulic power units, accumulators, bypass lines, and additional appurtenances as defined in this Specification Section and the related Specification Sections listed in Section 1.5 below.

The replacement valves and major components shall have a minimum design life of 50 years.

D. Both valves feature a unique tapered body design to facilitate installation and removal without the use of a dismantling joint. OPM desires the replacement valves retain this feature to allow for reuse of the existing penstock mating flanges.

1.4 EXAMINATION OF SITE AND DOCUMENTS

A. Bidders are expected to examine and to be thoroughly familiar with all contract documents and with the conditions under which work will be carried out. The Awarding Authority (Owner) will not be responsible for errors, omissions and/or charges for extra work arising from Contractor's failure to familiarize themselves with the Contract Documents or existing conditions. By submitting a bid, the Bidder agrees and warrants that he has had the opportunity to examine the site and the Contract Documents, that he is familiar with the conditions and requirements of both and where they require, in any part of the work a given result to be produced, that the Contract Documents are adequate and that he will produce the required results.

B. Pre-Bid Conference: Bidders are strongly encouraged to attend the Pre-Bid conference; refer to Advertisement for Bids for time and date.

1.5 INSTALLATION SITE

A. The Upper and Lower Isolation Valves and appurtenances shall be installed at the Cobble Mountain Hydroelectric Development located in Granville, Massachusetts.

1.6 SCOPE OF WORK

The following summarizes the scope of supply and field services work included the Unit 3 Butterfly Valves Replacement Scope of Work for the Plumbing FSB. Refer to Related Sections listed below for details.

A. 84-inch Upper Isolation Valve Field Services:

1. Install Valve Contractor supplied instrumentation and associated tubing, fittings, and valves. (Section 40 05 64.22)

2. Perform field coating / coating repair work on valve, penstock flanges, bypass line, etc. as required.

(Section 40 05 64.22)

B. 72-inch Lower Isolation Valve Field Services:

1. Install Valve Contractor supplied instrumentation and associated tubing, fittings, and valves. (Section 40 05 64.22)

2. Perform field coating / coating repair work on valve, bypass line, etc. as required. (Section 40 05 64.22)

C. Bid Alternate Number 1:

Springfield Water & Sewer Commission Cobble Mountain – Unit 3 Butterfly Valve

Replacement 22 01 00 - 2

10429200 PROJECT SCOPE OVERVIEW

1. OPM wishes to evaluate also replacing the Unit 1 84-inch Upper Isolation Valve and the Unit 1 72-inch Lower Isolation Valve in addition to the Unit 3 valve replacements described herein. Bidder to provide an additional proposal for the replacement of the Unit 1 valves noting the following. Refer to Section 40 05 64.22, Part 3.16 for the recommended sequence of construction activities for Bid Alternate Number 1.

a. Replacement 84-inch Upper Isolation Valve package for Unit 1, with identical scope as Unit 3, as described in Item 1.4A and 1.4B.

b. Replacement 72-inch Lower Isolation Valve package for Unit 1, identical to Unit 3, as described in Item 1.4C and 1.4D.

1.7 GUARANTEE/WARRANTY

A. Manufacturer(s) and Contractor shall provide their standard guarantees/ warranties for their work under this Section. Such guarantees/warranties shall be in addition to and not instead of all other specified liabilities, which the manufacturer(s) and Contractor may have by law, or by other provisions of the Contract Documents.

B. The guarantee/warranty shall be in addition to and not instead of all other liabilities which manufacturer(s); Contractor may have by law or by other provisions of the Contract Documents.

1.8 ELECTRICAL INSTALLATIONS

A. Coordinate plumbing equipment and materials installation with other building components. Fully coordinate work with that of other trades. Furnish information in writing that is needed for the coordination of clearances, with the work of others, and such information shall be given in a timely fashion so as not to impede the progress of two or more trades. Confer and resolve the conflict immediately.

B. Verify all dimensions by field measurements.

C. Arrange for chases, slots, and openings in other building components to allow for plumbing installations.

D. Coordinate the installation of required supporting devices and sleeves to be set in poured in place concrete and other structural components, as they are constructed.

E. Sequence, coordinate, and integrate installations of plumbing materials and equipment for efficient flow of the Work. Give particular attention to large equipment requiring positioning prior to closing-in the building.

F. Coordinate the cutting and patching of building components to accommodate the installation of plumbing equipment and materials.

G. Where mounting heights are not detailed or dimensioned, the exact location shall be determined on the job, install overhead equipment to provide the maximum headroom possible.

H. Install plumbing equipment to facilitate maintenance and repair or replacement of equipment components. As much as practical, connect equipment for ease of disconnecting, with minimum of interference with other installations.

I. Engineer reserves the right to revise drawings from time to time to indicate changes in work. When revised drawings are issued, notify Engineer in writing that revised drawings involve addition or deduction of a specific amount of money to contract price. Do not proceed with revised work without prior review by Engineer or Owner of cost or revised work.

1.9 CLEANING

A. Upon completion of work, the plumbing subcontractor shall clean, polish and leave bright, fixtures and lamps, and shall remove all dust, dirt, debris and loose plaster in their work area.

1.10 SERVICE VOLTAGE

A. The station has 110/240V single phase power and 240V three phase power available. There is also 240V three-phase available by the station surge tank and 480V power in the valve house.

Springfield Water & Sewer Commission

Replacement 22 01 00 - 3

10429200 PROJECT SCOPE OVERVIEW

1.11 RELATED SPECIFICATION SECTIONS

A. Section 00 00 01.22 – Index of Reference Drawings and Documents

B. Section 09 99 00.22 – Coatings

C. Section 40 05 57.22 – Hydraulic Power Unit and Accumulator

D. Section 40 05 64.22 – Upper and Lower Isolation Valves

1.12 INDEX OF DRAWINGS

A. See Specification Section 00 00 01.22 for an index of reference drawings and documents provided with this Specification.

PART 2 - PRODUCTS (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

PART 3 - EXECUTION (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

END OF SECTION

01 00 00.22

Springfield Water & Sewer Commission

Replacement 22 01 00 - 4

10429200 INDEX OF DRAWINGS Springfield Water & Sewer Commission Cobble Mountain – Unit 3 Butterfly Valve Replacement

00 00 01.22 1

SECTION 00 00 01.22

INDEX OF DRAWINGS

- Plumbing (FSB)

PART 1 - GENERAL

1.1 INDEX OF DRAWINGS

A. The drawings in the table below are available drawings for this site and will be provided to the Contractor during the bidding process.

Drawing Number Drawing Title

10001 GENERAL PLAN IN VICINITY OF POWER HOUSE

10003 PENSTOCK LOCATION VICINITY OF POWER HOUSE

10012 GENERAL PLAN

11004 POWERHOUSE FLOOR PLANS AND DETAILS

11007 PENSTOCK ANCHORS

11008 PENSTOCK FOUNDATIONS

11009 NO.1 PENSTOCK ANCHOR

11010 ANCHOR #5 PENSTOCK #1

11011 REINFORCEMENT OF NO. 3 PENSTOCK

14001 ELEVATIONS & SECTION VALVE HOUSE

14006 BASEMENT PLAN ELEVATION 506.5'

14007 PLAN OF MAIN FLOOR

14008 EAST ELEVATION

14009 END ELEVATION

14011 REAR ELEVATION

14012 END ELEVATIONS

14013 FRONT ELEVATION

14014 SECTIONS

14015 TRANSVERSE SECTION THRU NO. 1 UNIT

14018 GOVERNOR OPENINGS IN GENERATOR ROOM FLOOR

14023 INSERT PLAN

23001 PIPING PLAN AND SECTIONS

31565 DETAILS OF PENSTOCK PIPE AND DRAIN PIPING

39036 UNIT #1 & #3 W/D M.O.V. FOR PENSTOCK BYPASS VALVE

41117 INSIDE ELEVATION - WEST WALL OF GENERATOR ROOM

41119 GENERAL PLAN OF BASEMENT

41120 GENERAL PLAN OF MAIN FLOOR

41121 BASEMENT PLAN

44002 MANIFOLD LOCATION

44007 PENSTOCK LAYOUT

44013 PRELIMINARY PENSTOCK LAYOUT

44014 "PENSTOCK PRESSURE & THICKNESS DIAGRAM"

44015 PENSTOCK MANIFOLD PATENTED

44017

LOCATION DIAGRAM OF BY-PASS SADDLES LOOKING

UPSTREAM SMALL PENSTOCK

45008 POWER TUNNEL GATE HOUSE

49001 HOUSING AND VALVE DISC. FOR 7' - 0" BUTTERFLY VALVE

49002 BY-PASS FOR 6' - 0" AND 4' - 3" BUTTERFLY VALVES

49003 8" DIA. EXTRA HEAVY 90 DEGREE ELL.

49004 8" DIA. EXTRA HEAVY ELL. WITH 1 1/2" AISW. OUTLET

49005 HOUSING AND VALVE DISC. FOR 6' - 0" BUTTERFLY VALVE

10429200 INDEX OF DRAWINGS Springfield Water & Sewer Commission Cobble Mountain – Unit 3 Butterfly Valve

Replacement 00 00 01.22 2

Drawing Number Drawing Title

49006

CYLINDER, CYLINDER HEAD & GUIDE FOR 4'-3" BUTTERFLY

VALVE

49007

ARRANGEMENT OF CONTROL GEAR FOR 4' - 3" & 6' - 0"

BUTTERFLY VALVES

49015 ASSEMBLY SECTION 4' - 3" DIA. BUTTERFLY VALVE

49016 ASSEMBLY SECTION 6' - 0" DIA. BUTTERFLY VALVE

49021

ARRANGEMENT OF PIPING FOR 6' - 0" & 4' - 3" BUTTERFLY

VALVES

49028

ARRANGEMENT OF PIPING FOR 6' - 0" & 4' - 3" BUTTERFLY

VALVES

49029

DETAIL OF SCREW & INDICATOR TUBE FOR 66" BUTTERFLY

VALVE

49030 LEVERS FOR 6' - 0" & 4' - 3" BUTTERFLY VALVES

49031

CYLINDER WALL BRACKETS FOR 4' - 3" & 6' - 0" BUTTERFLY

VALVES

49032 NAME & INDICATOR PLATES FOR BUTTERFLY VALVE STAND

49033

SECTIONAL ELEVATION OPER. STAND FOR BUTTERFLY VALVE 5'-

0" & 7'-0"

49034 LEVERS FOR 7' - 0" & 5' - 0" BUTTERFLY VALVES

49035

PISTON & ROD, CON. ROD & CROSSHEAD FOR 4' - 3" BUTTERFLY

VALVE

49036 5' DIA. EXTRA HEAVY 90 DEG. ELL. WITH 1 1/2 " SIDE OUTLET

49056 DETAILS OF PENSTOCK PIPE & DRAIN PIPING

49059 DETAILS OF PENSTOCK PIPE & FLANGES

140553 GENERAL ARRANGEMENT BUTTERFLY VALVE

PART 2 - PRODUCTS (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

PART 3 - EXECUTION (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

END OF SECTION

00 00 01.22

10429200 Springfield Water & Sewer Commission COATINGS Cobble Mountain – Unit 3 Butterfly Valve Replacement

09 99 00.22 - 1

SECTION 09 99 00.22

COATINGS

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

The general provisions of the Contract, including General Conditions, Codes and Standards (if any), and General Requirements, apply to the work specified in this Section.

1.2 RELATED WORK SPECIFIED ELSEWHERE

Not applicable

1.3 DESCRIPTION OF WORK

Furnish all labor, equipment, and materials and completely perform existing lead paint abatement and coating work as described in this section, related sections, specified on the Drawings, or as directed by the Engineer.

All color patterns are to be approved by the Engineer prior to the start of Fabrication.

1.4 APPLICABLE STANDARDS

All turbine and associated components coating shall be applied in accordance with coating manufacturer’s specifications.

PART 2 - PRODUCTS

2.1 MATERIALS

All turbine and associated components coating material shall be applied in accordance with coating manufacturer’s specifications and as specified under Part 3-Execution.

PART 3 - EXECUTION

3.1 COATINGS

Preparation, installation, and application execution shall be in accordance with applicable manufacturer’s Coatings Specifications. Detailed specifications on surfaces are provided below:

1. All interior surfaces of tanks, pipes, and appurtenances that require coating and will be in direct contact with potable water systems or systems that discharge to the tailrace shall be coated with a 100% solids epoxy lining certified to NSF 61 and compliant with extraction requirements of NSF

600. Acceptable products include Tnemec Series 22 Epoxoline, Sherwin -Williams Dura-Plate UHS, or Engineer approved alternative. Coatings shall be applied strictly per manufacturer’s instructions, including cure times and ventilation requirements. Only primers and topcoats listed by the manufacturer as NSF 61-compliant shall be used.

2. Carbon Steel including stationary parts that are non-mating surfaces exposed to atmosphere will be prepared to a surface profile of 1-2 mils using commercial blast cleaning. Primer will be one coat of 3-5 mills of thickness with TNEMEC Series 161 Polyamide Epoxy or the Engineer-approved equivalent. The finish coating will be one coat of TNEMEC Series 161 Polyamide Epoxy with 4-6 mills of thickness or the Engineer-approved equivalent. The total thickness allowable for the primer and finish coating is 7-11 mils.

3. Carbon Steel including moving parts that are non-mating surfaces exposed to atmosphere will be prepared to a surface profile of 1-2 mils using commercial blast cleaning. Primer will be one coat of 3-5 mills of thickness with TNEMEC Series 161 Polyamide Epoxy or the Engineer-approved equivalent. The finish coating will be one coat of TNEMEC Series 161 Polyamide Epoxy with 4-6 mills of thickness or the Engineer-approved equivalent. The total thickness allowable for the primer and finish coating is 7-11 mils.

4. Carbon Steel including un-machined water passage surfaces will be prepared to a surface profile of 1-2 mils using near white blast cleaning. Primer will be one coat of 3-5 mills of thickness with

10429200 Springfield Water & Sewer Commission COATINGS Cobble Mountain – Unit 3 Butterfly Valve Replacement

09 99 00.22 - 2

TNEMEC Series 161 Polyamide Epoxy or the Engineer-approved equivalent. The finish coating will be one coat of TNEMEC Series 161 Polyamide Epoxy with 4-6 mills of thickness or the Engineer-approved equivalent. The total thickness allowable for the primer and finish coating is 7-11 mils.

5. Carbon Steel including machined water passage surfaces will be prepared to a surface profile of 1-2 mils using solvent cleaning and brush off blast cleaning. Primer will be one coat of 3-5 mills of thickness with TNEMEC Series 161 Polyamide Epoxy or the Engineer-approved equivalent. The finish coating will be one coat of TNEMEC Series 161 Polyamide Epoxy with 4-6 mills of thickness or the Engineer-approved equivalent. The total thickness allowable for the primer and finish coating is 7-11 mils.

6. Carbon Steel that is submerged in or exposed to oil will be prepared to a surface profile of 1-2 mils using near white blast cleaning. Primer will be one coat of 4-6 mills of thickness with TNEMEC Series 61-5002 Cycloaliphatic Amine Epoxy or the OPM-approved equivalent. The finish coating will be one coat of TNEMEC Series 61-5001 Cycloaliphatic Amine Epoxy with 6-8 mills of thickness or the Engineer-approved equivalent. The total thickness allowable for the primer and finish coating is 10-14 mils.

7. Carbon Steel and Stainless Steel including machined mating surfaces or surfaces that are machined for clearance to be exposed during shipment will be prepared by solvent cleaning. The finish coating will be TECTYL 502C or the Engineer-approved equivalent with manufacturer’s specification approved thickness.

8. Stainless Steel including surfaces on runner not outlined under 3.1.5 will be prepared by solvent cleaning. The finish coating will be two coats of Tempil Bloxide De-Oxidizing Primer or the Engineer-approved equivalent with manufacturer’s specification approved thickness.

09 99 00.22

10429200 Springfield Water & Sewer Commission HYDRAULIC POWER UNIT Cobble Mountain – Unit 3 Butterfly Valve Replacement AND ACCUMULATOR

40 05 57.22 - 1

SECTION 40 05 57.22

HYDRAULIC POWER UNIT AND ACCUMULATOR

Part 1 - GENERAL

1.1 PURPOSE

A. This Specification Section covers the Plumbing FSB scope for the design, manufacturer, testing, delivery, and field services as defined herein of one (1) Hydraulic Power Unit (HPU) and Accumulator System for the 84-inch Upper Isolation Valve and one (1) HPU and Accumulator System for the 72-inch Lower Isolation Valve.

B. Refer to Specification Section 01 00 00 for details regarding Bid Alternate Number 1, the optional additional scope to duplicate the Scope of Work defined herein, but for Unit 1. The specifications for the Unit 1 scope are identical to those defined herein for Unit 3, unless specifically noted otherwise.

1.2 SCOPE OF WORK

A. The scope of work included in this Specification Section is applicable to both the Upper and Lower Isolation Valves (Specification Section 40 05 64) and is summarized as follows:

1. The Plumbing FSB is responsible for installing all interconnecting hydraulic piping, tubing, hoses, and valves for the HPU and Accumulator Systems. Plumbing FSB shall also furnish and install the hydraulic piping located between the HPU and the Upper/Lower Isolation Valve hydraulic cylinder.

1.3 RELATED SPECIFICATION SECTIONS

A. Refer to Section 01 00 00.22 for all related Specification Sections.

1.4 APPLICABLE CODES AND STANDARDS

A. Refer to Section 01 42 19 for all applicable Codes and Standards.

1.5 SUBMITTALS

Separate submittals shall be provided for the Upper and Lower Isolation Valves and associated components, and each submittal shall clearly identify which valve the submittal is applicable to. Common submittals representing both valves shall not be accepted.

A. Field Installation

1. Provide field installation drawings with a detailed description of the field installation procedures for all

HPU and Accumulator System piping. The description shall include the following: location and method of support for installation and handling of equipment, the provisions to be taken to protect equipment, facilities and other work during installation, the method of maintaining components in correct alignment, and the methods for installing other appurtenant items. The installation plan shall include a description of the installation sequence and procedures to be followed by the Installation Plumbing FSB during the performance of this Contract. Plan shall include field verified dimensions as necessary.

2. Provide details for pipe/tubing supports and hangers. Spacing of pipe supports shall be per ASME B31.1, Power Piping.

3. For all welders performing work Plumbing FSB shall submit to the Engineer, a Welder Performance Qualification (WPQ) certification.

4. For all pipe welds, Plumbing FSB shall submit to the Engineer, a Welding Procedure Specification (WPS) for each type of pipe weld.

1.6 COORDINATION

A. The Valve Contractor shall coordinate the layout and installation of the equipment with other construction activities including conduits, cable trays, and other equipment and adjacent surfaces.

10429200 Springfield Water & Sewer Commission HYDRAULIC POWER UNIT Cobble Mountain – Unit 3 Butterfly Valve Replacement AND ACCUMULATOR

40 05 57.22 - 2

B. New cabling and conduit from the existing control cabinets and field equipment to the new HPUs as well as power cabling for HPU required power supplies will be supplied by Others. The Valve Contractor shall supply all power converters and cabling/wiring for 24 distribution. Coordination, including clarifications, wiring information, drawings, and field testing support.

C. Submittals shall clearly indicate demarcation between new and existing equipment as appropriate to clearly communicate the full scope of work and interface points.

Part 2 - PRODUCTS (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

Part 3 - EXECUTION

3.1 COATINGS

A. Refer to Specification Section 09 99 00.22 “Coatings” for coating specifications.

B. All machined carbon steel surfaces shall be protected with rust inhibiting removable coating such as Tectyl or Cosmoline.

3.2 INSTALLATION OF NEW HPU AND ACCUMULATOR

A. Valve Contractor shall install the complete HPU, accumulator, and hydraulic system. Install HPU and Accumulator and anchor in place at the location as shown on Engineer approved submittal drawings. Install HPU and accumulator per Valve Contractor field installation procedures.

B. Valve Contractor shall assemble HPU and accumulator oil spill containment pans (as necessary) and interconnecting piping per approved drawings. Valve Contractor shall leak test oil spill containment by filling with water to within 1-inch of the top of the oil spill containment and holding full for 1-hour while inspecting for leaks.

3.3 INSTALLATION OF HYDRAULIC PIPING, TUBING, AND HOSES

A. Plumbing FSB shall install SS hydraulic oil high pressure piping, valves, SS flex hoses and pipe supports and anchors between HPU, accumulator, and hydraulic cylinder, per Engineer approved submittal drawings.

B. Piping shall be seamless with welded connections as specified in Part 2 of this Specification Section. Valve Contractor shall provide welding rod and all consumables. All pipe welding shall be in compliance with ASME B31.1 Code for Pressure Piping.

C. No NPT pipe threaded connections are allowed for hydraulic pipe or oil spill containment interconnecting piping.

D. All butt-welded pipe shall have a GTAW root weld (TIG root) with a SMAW cap or be fully GTAW welded.

E. Plumbing FSB shall provide NDE of all pipe welding in accordance with ASME B31.1, Chapter VI. At minimum, 100% visual inspection of all pipe welding shall be performed. This includes inspection of all socket welding to ensure pipe is fully inserted in socket and then withdrawn 1/16” to comply with ASME B31.1 Fig. 127.4.4(C) Minimum Welding Dimensions Required for Socket Welding.

F. Any hydraulic piping that fails testing shall be repaired/replaced and retested at Plumbing FSB expense.

G. All pipe assembly, welding, and pressure testing inspections shall be performed by a qualified independent inspector provided by the Valve Contractor.

40 05 57.22

10429200 Springfield Water & Sewer Commission UPPER AND LOWER Cobble Mountain – Unit 3 Butterfly Valve Replacement ISOLATION VALVES

40 05 64.22 - 1

SECTION 40 05 64.22

UPPER AND LOWER ISOLATION VALVES

PART 1 - GENERAL

1.1 SCOPE OF WORK

A. This section covers the Plumbing FSB scope of work for the engineering, manufacture, testing, delivery, and field services, as defined herein, of one 84-inch Upper Isolation Valve and one 72-inch Lower Isolation Valve and associated lever arm, hydraulic cylinder, and supports.

B. Refer to Specification Section 01 00 00.22 for a complete summary of all major components and work included within the “Cobble Mountain Unit 3 Butterfly Valve Replacement” scope and a listing of all related Specification Sections.

C. Refer to Specification Section 01 00 00.22 for details regarding Bid Alternate Number 1, which includes replacing the Unit 1 Upper and Lower Isolation Valves in addition to replacing the Unit 3 Upper and Lower Isolation Valves. The specifications for the Unit 1 scope are identical to those defined herein for Unit 3, unless specifically noted otherwise.

1.2 VALVE DESIGN CRITERIA

A. Unless specifically noted otherwise, all design criteria in this section applies to both the Upper and Lower Isolation Valves.

B. The Upper Isolation Valve shall replace the existing Unit 3 penstock shutoff valve. The Lower Isolation Valve shall replace the existing Unit 3 turbine shutoff valve.

C. Valve Design Criteria Summary Table:

Design Parameter Upper Valve Lower Valve

Nominal Diameter: 84 inches 72 inches

Fluid: Raw Water

Maximum Static Operating Pressure (MSOP): 73 psig 195 psig

Design Pressure: 97 psig 250 psig

Test Pressure: 145 psig 375 psig

Fluid Temperature: < 100 °F

Maximum Penstock Flow Rate: 540 cfs (See Note 2 below) Function: Full open / close under balanced head, Emergency close under max. unbalanced head and flow.

Normal Duty Cycle: Up to 1 full close/open cycle per year.

See Note 1 below.

3 full open/close cycles per day under balanced head.

Emergency Close Duty Cycle: 1 full closure under maximum head and flow per year.

Valve Disc Unseating Torque: TBD by Valve Contractor

Valve Disc Seating Torque: TBD by Valve Contractor

10429200 Springfield Water & Sewer Commission UPPER AND LOWER Cobble Mountain – Unit 3 Butterfly Valve Replacement ISOLATION VALVES

40 05 64.22 - 2

Design Parameter Upper Valve Lower Valve

Operator Type Lever arm and hydraulic cylinder powered by HPU

Normal Close Valve Stroke Time 70 – 85 sec 60 – 90 sec

Emergency Close Valve Stroke Time 70 - 85 sec 60 – 90 sec

Note 1: Normal operation to refill penstock is to manually crack open the Upper Isolation Valve (under unbalanced head) about 10% since there is no by-pass line. Once balanced head is achieved the valve is fully opened the rest of the way.

Note 2: The maximum flow rate of the current unit is 540 cfs. It is expected the refurbished unit will be similar, this number will be confirmed by the Turbine Generator Refurbishment Contractor.

1.3 LOWER ISOLATION VALVE BYPASS LINE DESIGN CRITERIA

A. Replacement bypass line shall be nominal pipe size 8-inches and shall include one bypass valve controlled by an electric motor operator. This valve does not require throttling capability, only full-open / full-close operation is required.

B. Replacement bypass line shall be installed and tested per ASME B31.1.

1.4 RELATED SPECIFICATION SECTIONS

A. Refer to Section 01 00 00.22 for all related Specification Sections.

1.5 SUBMITTALS

Plumbing FSB shall provide the following list of submittals. See Specification Section 01 30 00 for requirements related to the submittal process. Separate submittals shall be provided for the Upper and Lower Isolation Valves and associated components, and each submittal shall clearly identify which valve the submittal is applicable to. Common submittals representing both valves shall not be accepted.

A. Upper/Lower Isolation Valve and hydraulic cylinder submittals:

1. Complete bill of materials.

2. Manufacturer's welding procedures and welder qualification report.

3. Post-weld heat treatment (PWHT) procedures, if applicable.

4. Comprehensive shipping and handling plan that details all protective cribbing and covering, wood blocking or other shipping protection means.

5. Field services plan and activity schedule including demolition, disposal, and installation.

6. Field Installation Procedures - Provide field installation drawings with a detailed description of the field installation procedures. The description shall include the following: location and method of support for installation and handling of equipment, the method of maintaining components in correct alignment, and the methods for installing other appurtenant items. The installation plan shall include a description of the installation sequence and procedures to be followed by the Valve Contractor during the performance of this contract.

B. Lower Isolation Valve Bypass Line

1. Layout drawing illustrating arrangement of each component.

2. Bill of materials for all items included.

C. Upper/Lower Isolation Valve Instruments

1. Schematic illustrating arrangement of tubing and valves included.

2. Bill of materials for all items included.

PART 2 - PRODUCTS (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

PART 3 - EXECUTION

10429200 Springfield Water & Sewer Commission UPPER AND LOWER Cobble Mountain – Unit 3 Butterfly Valve Replacement ISOLATION VALVES

40 05 64.22 - 3

A. Plumbing FSB shall install/construct replacement valve piping and fittings, per approved design submittals.

B. At the completion of commissioning, Plumbing FSB shall perform coating touch-up/repair work as necessary per Specification Section 09 99 00.22 “Coatings”.

3.2 LOWER ISOLATION VALVE BYPASS LINE

A. The bypass line shall be installed per approved arrangement drawing and tested in accordance with ASME B31.1. Plumbing FSB shall supply all required flange hardware and gaskets required for installation.

40 05 64.22

ATTACHMENT #2

10429200 PROJECT SCOPE OVERVIEW Springfield Water & Sewer Commission Cobble Mountain – Unit 3 Butterfly Valve

Replacement 26 01 00 - 1

SECTION 26 01 00

PROJECT SCOPE OVERVIEW (ELECTRICAL FSB)

PART 1 - GENERAL

1.1 GENERAL PROVISIONS

A. Attention is directed to the CONTRACT AND GENERAL CONDITIONS and all Sections within DIVISION 01 - GENERAL REQUIREMENTS which are hereby made a part of this Section of the Specifications.

B. Time, Manner and Requirements for Submitting Sub-Bids:

1. Sub-bids for work under this Section shall be for the complete work and shall be filed as stipulated in the "INSTRUCTIONS TO BIDDERS".

2. Each sub-bid submitted for work under this Section shall be filed as required by Section 44F of

Chapter 149 of the General Laws, as amended.

1.2 OVERVIEW OF COBBLE MOUNTAIN REFURBISHMENT PROJECT

A. The Cobble Mountain Hydropower Station, constructed in 1930, is operated by Holyoke Gas and Electric (HG&E) on behalf of the facility owner, Springfield Water and Sewer Commission (SWSC). The project is comprised of the Cobble Mountain Dam and reservoir, intake works, 7,000 feet of concrete and steel-lined tunnel, surge tank and valve house, three steel penstocks each measuring approximately 1,000 feet long, a powerhouse with three vertical Francis-type hydroelectric generating units, and a substation.

B. SWSC has determined it is time to refurbish/replace several major components including the Unit 3 Turbine and Generator, the Unit 3 Penstock Upper and Lower Isolation Butterfly Valves, install a carbon-fiber reinforced polymer (CFRP) liner in the Unit 3 penstock, perform powerhouse concrete repair work, and replace the powerhouse bridge crane. The outage for this work is anticipated to occur in 2028 and the Operator, HG&E will serve as the Owner’s Project Manager (OPM) to oversee all tasks.

The complete project Scope of Work is divided as follows, with the first bullet item being this contract:

• Cobble Mountain Unit 3 Butterfly Valves Replacement

• Cobble Mountain Unit 3 Turbine Generator Rehabilitation

• Cobble Mountain Unit 3 Penstock CFRP Liner

• Cobble Mountain Bridge Crane Replacement

• Cobble Mountain Electrical Modernization

C. Essential to successfully completing not only the Scope of Work included in this task but the project overall, all Contractors will be required to coordinate and collaborate with other Contractors and OPM, as required for use of common workspaces, crane usage, access, etc. Any schedule, space, resource, or other logistical conflicts anticipated by this Scope of Work’s Contractor (Valve Contractor) shall immediately be brought to OPM’s attention for resolution. Valve Contractor shall participate in periodic coordination meetings during on-site work to anticipate and resolve conflicts as they are identified.

D. SWSC is also interested in the refurbishment of the Unit 1 Butterfly Valves concurrently with Unit 3.

The scope for Unit 1 would be identical to the Unit 3 scope. Bidder to provide a Bid Alternate (Number

1) which includes the additional, optional scope items related to Unit 1. See Section 1.4 F for details.

1.3 OVERVIEW OF UNIT 3 BUTTERFLY VALVES REPLACEMENT

A. The Cobble Mountain Hydroelectric Station Unit 3 penstock includes two butterfly type isolation valves for plant operation. One is located in the powerhouse immediately upstream of the spiral case (Lower Isolation Valve) and the other is at the beginning of the Unit 3 penstock, just downstream of the surge tank and trifurcation (Upper Isolation Valve). The 72-inch diameter Lower Isolation Valve operates as a typical turbine shut-off valve (TSV) and is controlled by a double acting cylinder operated by headwater pressure. The 84-inch diameter Upper Isolation Valve operates as a typical penstock shutoff valve (PSV), is located in a valve house, and is electric motor operated with manual override.

Addendum No 2, Attachment No 2

10429200 PROJECT SCOPE OVERVIEW Springfield Water & Sewer Commission Cobble Mountain – Unit 3 Butterfly Valve

Replacement 26 01 00- 2

B. The Upper Isolation Valve does not have a bypass line, and instead fills the penstock by locally and manually opening/cracking the valve approximately 10%. Once differential pressure across the valve has equalized, the valve controls continue to open the valve to full open position. The Lower Isolation Valve does include a bypass line, utilized for filling the scroll case and turbine to balance head across the valve, prior to opening it. The lower valve is under higher hydraulic pressure.

C. Both valves are OEM equipment (1930’s vintage) and have been reported to leak excessively. The valve exteriors are corroded and there are concerns with the reliability of both valve actuators. Both valves have been identified as having exceeded their reliable design life. The goal of the modernization efforts included in this Scope of Work is to procure and install replacement Upper and Lower Isolation Valves, hydraulic cylinders and hydraulic power units, accumulators, bypass lines, and additional appurtenances as defined in this Specification Section and the related Specification Sections listed in Section 1.5 below.

The replacement valves and major components shall have a minimum design life of 50 years.

D. Both valves feature a unique tapered body design to facilitate installation and removal without the use of a dismantling joint. OPM desires the replacement valves retain this feature to allow for reuse of the existing penstock mating flanges.

1.4 EXAMINATION OF SITE AND DOCUMENTS

A. Bidders are expected to examine and to be thoroughly familiar with all contract documents and with the conditions under which work will be carried out. The Awarding Authority (Owner) will not be responsible for errors, omissions and/or charges for extra work arising from Contractor's failure to familiarize themselves with the Contract Documents or existing conditions. By submitting a bid, the Bidder agrees and warrants that he has had the opportunity to examine the site and the Contract Documents, that he is familiar with the conditions and requirements of both and where they require, in any part of the work a given result to be produced, that the Contract Documents are adequate and that he will produce the required results.

B. Pre-Bid Conference: Bidders are strongly encouraged to attend the Pre-Bid conference; refer to Advertisement for Bids for time and date.

1.5 INSTALLATION SITE

A. The Upper and Lower Isolation Valves and appurtenances shall be installed at the Cobble Mountain Hydroelectric Development located in Granville, Massachusetts. Refer to Section 01 66 00 for delivery address and all shipping and handling instructions.

1.6 SCOPE OF WORK

The following summarizes the scope of supply and field services work included the Unit 3 Butterfly Valves Replacement Scope of Work for the Electrical FSB. Refer to Related Sections listed below for details.

A. 84-inch Upper Isolation Valve Supply:

1. Furnish all associated wiring and conduit required to wire Valve Contractor provided instrumentation into Valve Contractor provided control panel. (Section 40 05 64)

B. 84-inch Upper Isolation Valve Field Services:

1. Wire all valve and HPU instrument devices to the Valve Contractor supplied control cabinet. Others will be responsible for supplying power feeds, wiring valve status, alarms, and control wiring into the local PLC or remote I/O system, as well as programming integration of the valve into the existing T/G control system (remote-emergency closure capability, valve position feedback/permissives, etc.)

(Section 40 05 64 & Section 40 05 57)

C. 72-inch Lower Isolation Valve Supply:

1. Furnish all associated wiring and conduit required to wire Valve Contractor provided instrumentation into Valve Contractor provided control panel. (Section 40 05 64)

D. 72-inch Lower Isolation Valve Field Services:

10429200 PROJECT SCOPE OVERVIEW Springfield Water & Sewer Commission Cobble Mountain – Unit 3 Butterfly Valve

Replacement 26 01 00- 3

1. Wire all valve and HPU instrument devices to the Valve Contractor supplied control cabinet. Others will be responsible for supplying power feeds, wiring valve status, alarms, and control wiring into the local PLC or remote I/O system, as well as programming integration of the valve into the existing T/G control system (remote-emergency closure capability, valve position feedback/permissives, etc.)

(Section 40 05 64.26 & Section 40 05 57.26)

E. Electrical demolition for all valves will be performed by Others.

F. Bid Alternate Number 1:

1. OPM wishes to evaluate also replacing the Unit 1 84-inch Upper Isolation Valve and the Unit 1 72-inch Lower Isolation Valve in addition to the Unit 3 valve replacements described herein. Bidder to provide an additional proposal for the replacement of the Unit 1 valves noting the following. Refer to Section 40 05 64, Part 3.16 for the recommended sequence of construction activities for Bid Alternate Number 1.

a. Replacement 84-inch Upper Isolation Valve package for Unit 1, with identical scope as Unit 3, as described in Item 1.4A and 1.4B.

b. Replacement 72-inch Lower Isolation Valve package for Unit 1, identical to Unit 3, as described in Item 1.4C and 1.4D.

1.7 GUARANTEE/WARRANTY

A. Manufacturer(s) and Contractor shall provide their standard guarantees/ warranties for their work under this Section. Such guarantees/warranties shall be in addition to and not instead of all other specified liabilities, which the manufacturer(s) and Contractor may have by law, or by other provisions of the Contract Documents.

B. The guarantee/warranty shall be in addition to and not instead of all other liabilities which manufacturer(s); Contractor may have by law or by other provisions of the Contract Documents.

1.8 ELECTRICAL INSTALLATIONS

A. Coordinate electrical equipment and materials installation with other building components. Fully coordinate work with that of other trades. Furnish information in writing that is needed for the coordination of clearances, with the work of others, and such information shall be given in a timely fashion so as not to impede the progress of two or more trades. Confer and resolve the conflict immediately.

B. Verify all dimensions by field measurements.

C. Arrange for chases, slots, and openings in other building components to allow for electrical installations.

D. Coordinate the installation of required supporting devices and sleeves to be set in poured in place concrete and other structural components, as they are constructed.

E. Sequence, coordinate, and integrate installations of electrical materials and equipment for efficient flow of the Work. Give particular attention to large equipment requiring positioning prior to closing-in the building.

F. Coordinate the cutting and patching of building components to accommodate the installation of electrical equipment and materials.

G. Where mounting heights are not detailed or dimensioned, the exact location shall be determined on the job, install electrical services and overhead equipment to provide the maximum headroom possible.

H. Install electrical equipment to facilitate maintenance and repair or replacement of equipment components. As much as practical, connect equipment for ease of disconnecting, with minimum of interference with other installations.

I. Coordinate connection of electrical systems with utilities and services. Comply with requirements of governing regulations, franchised service companies, and controlling agencies. Provide required connection for each service.

10429200 Springfield Water & Sewer Commission PROJECT SCOPE OVERVIEW Cobble Mountain – Unit 3 Butterfly Valve Replacement

01 00 00.26 - 4

J. Engineer reserves the right to revise drawings from time to time to indicate changes in work. When revised drawings are issued, notify Engineer in writing that revised drawings involve addition or deduction of a specific amount of money to contract price. Do not proceed with revised work without prior review by Engineer or Owner of cost or revised work.

K. The installation shall be performed in accordance with and shall conform in all respects to applicable requirements of latest National Electrical Code, rules and regulations governing installation of electrical work in the locality of the work, applicable requirements state and local authorities having jurisdiction.

1.9 CLEANING

A. Upon completion of work, the electrical subcontractor shall clean, polish and leave bright, fixtures and lamps, and shall remove dust, dirt, debris and loose plaster from panelboards, controls, and switchboards.

Unused openings in pullboxes, junction boxes, equipment and raceways shall be capped or closed by an approved means. Replace all inoperative lamps and lamps that have been used during construction.

1.10 SERVICE VOLTAGE

A. The station has 110/240V single phase power and 240V three phase power available. There is also 240V three-phase available by the station surge tank and 480V power in the valve house.

1.11 RELATED SPECIFICATION SECTIONS

A. Section 00 00 01.26 – Index of Reference Drawings and Documents

B. Section 40 05 57.26 – Hydraulic Power Unit and Accumulator

C. Section 40 05 64.26 – Upper and Lower Isolation Valves

1.12 INDEX OF DRAWINGS

A. See Specification Section 00 00 01.26 for an index of reference drawings and documents provided with this Specification.

PART 2 - PRODUCTS (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

PART 3 - EXECUTION (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

26 01 00

10429200 Springfield Water & Sewer Commission INDEX OF DRAWINGS Cobble Mountain – Unit 3 Butterfly Valve Replacement

00 00 01.26 - 1

SECTION 00 00 01.26

INDEX OF DRAWINGS

PART 1 - GENERAL

1.1 INDEX OF DRAWINGS

A. The drawings in the table below are available drawings for this site and will be provided to the Contractor during the bidding process.

Drawing Number Drawing Title

11004 POWERHOUSE FLOOR PLANS AND DETAILS

14001 ELEVATIONS & SECTION VALVE HOUSE

14006 BASEMENT PLAN ELEVATION 506.5'

14007 PLAN OF MAIN FLOOR

14015 TRANSVERSE SECTION THRU NO. 1 UNIT

14018 GOVERNOR OPENINGS IN GENERATOR ROOM FLOOR

39036 UNIT #1 & #3 W/D M.O.V. FOR PENSTOCK BYPASS VALVE

41001 VALVE HOUSE SUBSTRUCTURE PLANS & SECTIONS

41117 INSIDE ELEVATION - WEST WALL OF GENERATOR ROOM

41119 GENERAL PLAN OF BASEMENT

41120 GENERAL PLAN OF MAIN FLOOR

41121 BASEMENT PLAN

49037 LIMIT SWITCH FOR 7' - 0" & 5' - 0" BUTTERFLY VALVE

140553 GENERAL ARRANGEMENT BUTTERFLY VALVE

PART 2 - PRODUCTS (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

PART 3 - EXECUTION (NOT APPLICABLE TO THIS SPECIFICATION SECTION)

00 00 01.26

10429200 Springfield Water & Sewer Commission HYDRAULIC POWER UNIT Cobble Mountain – Unit 3 Butterfly Valve Replacement AND ACCUMULATOR

40 05 57.26 - 1

SECTION 40 05 57.26

HYDRAULIC POWER UNIT AND ACCUMULATOR

Part 1 - GENERAL

1.1 PURPOSE

A. This Specification Section covers the Electrical FSB scope for the design, manufacturer, testing, delivery, and field services as defined herein of one (1) Hydraulic Power Unit (HPU) and Accumulator System for the 84-inch Upper Isolation Valve and one (1) HPU and Accumulator System for the 72-inch Lower Isolation Valve.

B. Refer to Specification Section 01 00 00.26 for details…