B.08.03 Amendment 0004- W9127S21R0002.pdf

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

Amendment 0004 provides the complete list of RFIs and their respective government responses and Specifications/Plans revisions. The proposal due date is also extended to 2:00 PM CST on March 12, 2021.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 125

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY 25-Feb-2021

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street , County, State and Zip Code) X W9127S21R0002

X 9B. DATED (SEE ITEM 11)

13-Jan-2021

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer X is extended, is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

25-Feb-2021

CODE

CONTRACTING DIVISION

USACE, LITTLE ROCK (W9127S)

700 W. CAPITOL AVE, RM 7315

LITTLE ROCK AR 72201-3225

W9127S 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

W9127S21R0002

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

SECTION 00 10 00 - SOLICITATION

The required response date/time has changed from 05-Mar-2021 02:00 PM to 12-Mar-2021 02:00 PM.

SECTION 00 40 00 - PROCUREMENT FORMS AND SUPPLEMENTS

The following have been added by full text:

AMENDMENT 0004

Specifications and Drawings Summary of Changes

01 14 00.00 46 (Attached) Changed paragraph 1.3.1 to expand work hours. Changed 1.3.3 to clarify outage restrictions. Added paragraph 1.3.4 to clarify scheduling requirements for work, especially as it relates to main unit outages. (9028874, 9028875)

01 22 00.00 10 (Attached) CLIN 0028 in Amendment 2 does not correct the revised title cited in the paragraph. Amendment 2 does not show that CLIN 0028 is new. Edited cited paragraph title in second sentence of 1.2.6.

02 84 33 Section is removed in its entirety. (9065568)

03 64 23.00 26 (Attached) Changed two instances of 120 feet to 150 feet in paragraph 3.2 in second new sentence per Amendment 2. (9065567)

05 50 04.00 26 (Attached) Note: Amendment 2 shows changes (blank page for 05 50 04.00 26); no changes are required for this section. Please ensure that this section is included in the contract in its entirety as originally written.

26 08 00.01 26 (Attached) Changed paragraph 3.4 to: After the Contractor has completed all testing required under these specifications, the Government will have 5 days per generating unit/transformer to conduct an independent verification of the results and a system commissioning procedure. The Government will develop the system commissioning procedure which will involve energization and operation of the newly installed equipment and existing equipment. The Contractor shall participate in these activities by reviewing and becoming familiar with the Government commissioning procedure, and by participating in the commissioning process. The Contractor shall provide one or more fully qualified craftsmen familiar with the work for five 10 hour days (total of 50 hours) per transformer to assist in the testing by taking readings, observing equipment, verifying settings, and making adjustments as instructed by the Government's Testing Engineer. (9065565)

26 11 15.00 26 (Attached) Changed maximum dimensions and panel/door access requirements of the HRG enclosures in 2.5.1. (9032011, 9037768, 9037774, 9040407)

26 13 13.00 26 (Attached) Edited sentence in 1.1 for maximum dimensions of switchgear sections. Added three sentences to 1.1. Edited 2.3.5.6 to mandate the use of hinged doors for primary (bus) compartment access. (9032011, 9037768, 9037774, 9040407)

26 28 00.00 26 (Attached)

W9127S21R0002

Add sentence to section 26 28 00.00 26 paragraph 2.2.4 after sentence ending in “…box ends”: Enclosures for panelboards SSBD3, SSBDA, SSBDB, SSBDC, and SSBD6 may meet the requirements of UL 508A instead of UL 50 and be fabricated from sheet steel of not less than No 12 gage. Add UL508A ((2018; Reprint Jul 2018) UL Standard for Safety Industrial Control Panels) to 26 28 00.00 26 paragraph 1.3. (9071956, 9071973)

Contract Drawings ED609, ED805, E-103, E-211, E-212, E-609, E-801, E-803, E-804, E-805, E-806 Changed contract drawings for re-arrangement of 15kV switchgear, increased maximum dimensions of switchgear sections. Edited cable and conduit schedule sheets (800 series) accordingly. Corrected omission of arc flash fiber optic sensors for 51SA and 51SB relays on station services transformer feeder schematic drawings and cable and conduit schedule. (9032011, 9037768, 9037774, 9040407)

The following have been deleted:

AMENDMENT 0002

(End of Summary of Changes)

Bid Inquiry Contractor Report

All Inquiries

Project: Norfork Modernization Electrical Install Low Voltage Dist. Recommendation

Review: NF MEI Solicitation RFI (00001)

(sorted by CommentID )

Displaying 58 inquiries.

Id Discipline Sheet Detail Spec

9017603 Safety 59 52.236-27

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Due to COVID-19 team members are unable to attend the physical site visit 1/21/21, and we are requesting a virtual site visit in its place. The high number of COVID-19 cases in the state and county of location also lend to highly increased contact and indirect exposure risks for personnel.

On: Jan 21 2021.

Government Response. . All site visits are held in accordance with CDC social distancing guidelines. There will be a second in-person site visit on January 28, 2021 at 10:00 AM CST.

Look for corresponding amendment on beta.SAM. On: Jan 22 2021

Current Request Status: Request Closed

Information for this report is procurement sensitive.

9018521 Contracting 59 of 60 52.236-27 B.08.02_SF1442

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Can a second site visit be scheduled?

On: Jan 21 2021.

Government Response. . There will be a second in-person site visit on January 28, 2021 at

10:00 AM CST. Look for corresponding amendment on beta.SAM. On: Jan 22 2021

Current Request Status: Request Closed

Information for this report is procurement sensitive.

9026880 Engineering

Support SECTION 01 35 26 part 3.5.3

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Will the project require an updated Arc Flash, Load Flow, and/or Coordination Study?

If so:

1.Is there an existing Study?

2.What will be the extent of the study i.e. how far down the distribution system will the study cover?

3.What software will be required for the study?

4.Can USACE provide copy of existing model for review?

On: Jan 25 2021.

Government Response. . The Contractor is required perform arc flash hazard analysis only where existing labels are not present or where review of labels or model results in the determination that further analysis is needed to complete the work in compliance with the https://www.projnet.org/projnet/binKornHome/index.cfm?strKornCob=BicPublicReportAll&strReportType=AllCont&RequestTimeout=1000&pagStrRowSort=CommentID https://www.projnet.org/projnet/binKornHome/index.cfm?strKornCob=BicPublicReportAll&strReportType=AllCont&RequestTimeout=1000&pagStrRowSort=Discipline https://www.projnet.org/projnet/binKornHome/index.cfm?strKornCob=BicPublicReportAll&strReportType=AllCont&RequestTimeout=1000&pagStrRowSort=Sheet https://www.projnet.org/projnet/binKornHome/index.cfm?strKornCob=BicPublicReportAll&strReportType=AllCont&RequestTimeout=1000&pagStrRowSort=Detail https://www.projnet.org/projnet/binKornHome/index.cfm?strKornCob=BicPublicReportAll&strReportType=AllCont&RequestTimeout=1000&pagStrRowSort=SpecText specifications. An existing model of the powerhouse is available; the Government will update the existing arc flash study and install new labels once new equipment is installed as part of this contract.

1. Is there an existing Study?

Yes, an arc flash study was performed, completed in January, 2021. Labels will be applied prior to start of onsite work for this project.

2. What will be the extent of the study i.e. how far down the distribution system will the study cover?

The existing arc flash study includes all existing equipment that will be removed by this project.

3. What software will be required for the study?

The existing arc flash study was performed using EasyPower software.

4. Can USACE provide copy of existing model for review?

The arc flash model (.dez) file will be provided after award upon request. On: Feb 05 2021

Information for this report is procurement sensitive.

9026983 Electrical E-103 Section 26 05 13.00 26 part 2.2.4.1

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Can you confirm if 15KV, 133% insulation level, MV-105 rated cable is adequate for refeeding the

GSU Transformers considering they are on a high resistance grounded system?

Background: Both IEEE and NEC recommend the use of 173% cable insulation thickness ground fault on a high-resistance grounded system will remain for more than 1 hour. Since manufactures don't generally make 173% insulation MV cables, it is likely to recommend a 100% rated cable that is a higher voltage class (i.e. a 25KV, 100% insulation rated cable meets the 173% or 260mils insulation thickness requirement of a typical 15KV 173% rated cable)(see IEEE 141-1993 Chapter 7 "Grounding"

Section 7.2 "System Grounding" and NEC 310.104(E).)

It is also worth noting that the existing MV cables feeding the generators is rated at 20KV.

Regards, Brandon L.

Midwest Electrical Construction, Inc.

(Attachment: Okonite_Tech_27_-_Cable_Insulation_Thickness.pdf) On: Jan 25 2021.

Government Response. . The generator lead cables extending from the 15kV switchgear to the respective GSU transformers are required to have a voltage rating of 15,000V with an insulation level of 133 percent per section 26 05 13.00 26 paragraph 2.2.4.1. Plant controls https://www.projnet.org/projnet/binKornHome/index.cfm?strKornCob=BicPublicFileDownload&strApp=&strPrevCob=BicPublicReportAll&strShown=Okonite_Tech_27_-_Cable_Insulation_Thickness.pdf&intView=1 will not allow a faulted section to be energized for over 1 hour, thus the requirements of

NFPA 70 (2017) Table 310.104(E) Note 2 are met. Please bid as specified. On: Feb 05 2021

Current Request Status: Request Closed

Information for this report is procurement sensitive.

9028868 Electronic Schedule

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The 75 individual items/task limitation for Factor 2, schedule, is grossly inadequate. A schedule for a project of this size which adequately shows the project from design to completion would require hundreds of tasks, even at bid stage. We request the task limitation be removed or adjusted to 10 11x17 pages.

On: Jan 26 2021.

Government Response. . The Gantt chart required for Factor 2 does not need to include every anticipated activity for the work; requirements for the schedule are listed in the

Submission Requirement. The Factor 2 Gantt chart schedule page limitation has been adjusted to no more than four 11"x17" pages. On: Feb 05 2021

9028870 Electrical Sub-Factor 1.4

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The 3 page limitation for Sub-Factor 1.4 is grossly inadequate. This requires manufacturer information, factory quality control, plans for removal, installation, testing and commissioning, catalog data and discussions on risks, constraints, etc. The catalog data sheets alone would require more than three pages. We request the page limitation be removed or adjusted to 20 pages.

Government Response. . The page limit of Sub-Factor 1.4 has been adjusted to ten pages, not including any catalog data. On: Feb 05 2021

9028872 Electrical Sub-Factor 1.3

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The 6 page limitation for Sub-Factor 1.3 is grossly inadequate. This item requires drawings for multiple pieces of equipment, layout drawings, connection drawings, one-line diagrams, catalog data, and design tests for the switchgear and bus. Also required are plans for removal, installation, testing and commissioning, discussions on risks, constraints, etc. The catalog data sheets alone would require more than 6 pages. We request the page limitation be removed or adjusted to 50 pages.

Government Response. . The page limit of Sub-Factor 1.3 has been adjusted to ten pages, not including any drawings, catalog data, or design tests. On: Feb 05 2021

9028874 Electrical Adequate schedule

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Adequate schedule allowances for government proposal review, contract award, design, submittals, and procurement, will not be completed before the first outage window of 15 September 2021. The spring outage window of 2022 is achievable for the first unit, from 15 March – 15 June. The second unit during the fall of 2022, 15 September – 15 December. Total contract time must be adjusted accordingly, February of 2023, for closeout documentation.

Government Response. . Per clause 52.211-10 the Contractor is required to complete the entire work ready for use not later than 820 calendar days after receipt of Notice to Proceed.

Based on anticipated date of Notice to Proceed, completion of all work is not required before

April 2023. Section 01 14 00.00 46 has been amended to clarify details on coordinating unit outages. On: Feb 25 2021

9028875 Electrical Paragraph

1.3.1 Section 01 14 00.00 46

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Section 01 14 00.00 46, Paragraph 1.3.1 restricts onsite work to four days per week, Monday through

Thursday. To complete all work required for each unit in a three month widow, at least five days per week will be required, sometimes six. We request this requirement be changed to 6 days per week, Monday through Saturday.

Government Response. . Section 01 14 00.00 46, Paragraph 1.3.1 has been amended to state, "Arrange work schedule so that the work performed at the Government installation will be during a shift established as 6:30 a.m. to 6:30 p.m., Monday through Saturday, except

Federal holidays. The Contracting Officer may consider allow additional work periods in special circumstances if properly requested, justified, and appropriate support staff are available." On: Feb 25 2021

9028877 Electrical Feature of Work Multiple Sections

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specifications include a.Section 05 50 03.01 26 Metalwork Fabrication, Machine Work, and Miscellaneous Provisions.

b.Section 05 50 04.00 26 Metals: Materials, Products, and Miscellaneous Items c.Section 05 50 04.01 26 Miscellaneous, Standard Articles, Shop Fabricated Items

What feature of work does each Section specifically cover? Each section seems to overlap the other.

On: Jan 26 2021.

Government Response. . Sections 05 50 03.01 26 and 05 50 04.01 26 were errantly included in the solicitation documents. The following specification sections have been removed: 05 50 03.01 26 and 05 50 04.01 26. Please propose on sections 05 05 23.16 26 and

05 50 04.00 26 as shown. On: Feb 05 2021

9028879 Electrical Earthwork Sections 31 00 00.00 26

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The specifications include two Sections 31 00 00.00 26 for Earthwork. Which should be used?

Government Response. . Sections 31 00 00.00 28 and 31 05 19.16 26 were errantly included in the solicitation documents and have been removed. On: Feb 05 2021

9028880 Electrical Commissioning Section 26 08 01.00 26

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Section 26 08 01.00 26 outlines the requirements for commissioning. It is understood that the contractor will test all new equipment and cabling installed. However, it is unclear who is responsible for testing how the new system functions within the existing system. This would include development and testing of relays and development and implementation of a functional test checklist for the entire system during commissioning. Will the government complete all relay programming/testing and provide a functional checklist for commissioning?

Government Response. . Section 26 08 01.00 26 paragraph 3.4 details Contractor involvement in Government-led commissioning activities. As indicated on the contract drawings, the Government will complete all relay programming. On: Feb 05 2021

9028883 Electrical Interface Wiring

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

We assume that the contractor is to provide interface wiring design between the new equipment and existing. Who is responsible for interfacing wiring design between GFE (exciters, GSU transformers) and existing equipment?

Government Response. . Interfacing wiring design between existing equipment and GFE

(explicitly exciters and GSU transformers) is the responsibility of the Contractor. For exciters refer to section 48 19 26.00 26 paragraphs 1.4.1, 1.4.2, and 3.2.2.1. For GSU transformers refer to section 48 19 23.00 26 paragraphs 1.4 and 1.5. On: Feb 05 2021

9028886 Electrical Hydrophilic Grout

Injection Section 03 64 23.00 26

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Section 03 64 23.00 26 Hydrophilic Grout Injection requires the contractor to complete a cable tunnel inspection report to identify areas that need to be repaired. It also requires the contractor to repair areas identified in the report. The contractor cannot quantify the repair work before completing the inspection. The scope of Grout Injection must be clearly defined and quantifiable. Federal Acquisition

Regulations prohibit placing unknown risks on the contractor.

Government Response. . The total estimated length of crack sealing is expected to be approximately 150 linear feet. Section 03 64 23.00 26 has been amended. On: Feb 05 2021

9028889 Electrical Paragraph

1.4.1 Section 02 82 13.00 10

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Section 02 82 13.00 10, Paragraph 1.4.1 states that wire insulation and switchboards and switchgear internal components may contain asbestos but have not been tested and that the contract includes work around cable tray composed of encapsulated ACM. The scope of Asbestos Abatement must be clearly defined and quantifiable. Federal Acquisition Regulations prohibit placing unknown risks on the contractor.

Government Response. . Section 02 82 13.00 10 paragraph 1.4.1, Pricing Schedule, and

Section 01 22 00.00 10 have been amended. On: Feb 05 2021

9028892 Electrical Paragraph

1.2 Section 02 84 33

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Section 02 84 33 Removal of PCBs, Paragraph 1.2 states that the primary consideration is contaminated gravel in the transformer oil containment basins and that removal, handling, and disposal work shall be considered as incidental to the work under this contract and no separate payment will be made therefore. In order to quote this feature of work the contractor will need to know the level and extent of contamination of the gravel and surrounding area. Is the contractor required to remove all contaminated material or only to the lines/grades required for new foundations? PCB abatement must be clearly defined and quantifiable. Federal Acquisition Regulations prohibit placing unknown risks on the contractor.

On: Jan 26 2021.

Government Response. . The Toxic Substance Control Act (TSCA) defines a Non-PCB transformer as: Any transformer containing less than 50 ppm PCB.

Attached are PCB test results for Norfork transformers from 1986 and 2012.

The 1986 tests are for all Norfork transformers and oil circuit breakers (removed in 1988[4]

& 1995 [5]). Transformer 1B contained 6 ppm PCB and the other 6 samples contained 4 ppm or less.

The 2012 tests are for transformer 2C which is the source of potential contamination referenced in RFI 9028892. Of the nine PCB types tested, 8 were below the detection threshhold

(2.0 ppm). One PCB was detectable (PCB 1260) at 2.6 ppm.

When Norfork transformer oil addition has been required, it has been PCB free new oil.

The oil containment system and oil-water separator were installed circa 1990, after the 1986 tests. The sources of contamination for this system were tested as non-PCB.

The gravel of concern in RFI 9028892 is beneath and adjacent to transformer 2C, which was retested as non-PCB in 2012.

The reference tests provide evidence the gravel of concern in RFI 9028892 is not contaminated.

In reply to the question in RFI 9028892 (Is the contractor required to remove all contaminated material or only to the lines/grades required for new foundations?):

The contractor is required to remove all contaminated material.

Testing data provided in amendment. On: Feb 05 2021

9031041 Commissioning

Section 48 70 01.00 26 NERC

COMPLIANCE FOR

HYDROGENERATORS

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Regards to the NERC compliance testing are you able to confirm if the units are identical, meaning the following information is the same?

1. Generator MVA nameplate rating

2. Units are rated at less that 350MVA each

3. Each unit has the same AVR, PSS and governor control systems

Based on our review this is our assumption, in which case standard procedure is that the testing only needs to be performed on one unit needs to be tested and data applied to both units. Can you confirm that this meets that USACE requirements for model validation?

On: Jan 27 2021.

Government Response. . The entirety of the model validation testing is intended to be performed on each unit, due to currently assumed differences between tuning and performance of some of the equipment (governors, in particular) and the relatively minor increase in scope for other equipment (exciters/PSS/generators in particular). Section 48 70

01.00 26 has been amended to clarify that this testing is to be performed on each unit. On:

Feb 05 2021

9032011 Electrical E-211 and E-212 SECTION 26 13 13.00 26 part 2.2.2 and 2.2.3

Can you confirm if 2000A (continuous current rating, rms) rated breaker would be acceptable for the station service breaker, generator circuit breaker and bus rating of the 15KV switchgear?

4 major equipment manufactures in the US have so far declined to bid the switchgear as shown since they can't make modern day 3000A rated breaker given the height constraints of 80" and the cooling needed for a 3000A switchgear design.

The existing and proposed CTs are shown on the contract drawings call called out at 2000:5A leading us to believe that the gear will not be operated above 2000A. Additionally, the 2000A rating would be capable of supplying over 47.7MVA at 13.8KV (per system) which is greater than the new transformer base rating of 40MVA per system.

Government Response. . A 2000A continuous rating for the generator breakers is not acceptable. 3000A continuous rating breakers are specified and required. Changes to the arrangement and maximum dimensions of the 15kV switchgear are included in Amendment

0004. On: Feb 25 2021

9032867 Electrical E-211 and E-212 SECTION 26 13 13.00 26 part 2.2.2 and 2.2.3

There is one manufacturer that can meet the 3000A bus/breaker requirements along with the max height of 6'8", however their overall depth on the gear is 88". Can you confirm if 88" in depth is adequate as opposed to the 86.25" mentioned in the drawings.

Government Response. . Changes to the arrangement and maximum dimensions of the

15kV switchgear are included in Amendment 0004. On: Feb 25 2021

9033289 Electrical Powerhouse Bridge

Crane

Will the powerhouse bridge crane be available for contractor use?

On: Jan 28 2021.

Government Response. . As indicated on Note 1 of contract drawing G-202, the bridge crane is available for Contractor use. Please note specification section 01 35 26 paragraph

1.6.1.5. On: Feb 05 2021

9033290 Electrical Powerhouse Bridge

Crane

Will the government operate the powerhouse bridge crane for the contractor?

Government Response. . Yes, the Government will operate the powerhouse bridge crane upon request from the Contractor. On: Feb 05 2021

9033293 Electrical Other Work

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

What other work, if any, is anticipated to coincide with the work under this contract?

Government Response. . Other work at the powerhouse includes, but is not limited to:

- Bridge crane replacement with onsite work expected between January and March 2022.

- Fire protection system rehabilitation onsite work is expected in early 2023.

- Addition of powerhouse elevator onsite work is expected in the first half of 2022. On: Feb

05 2021

9033294 Electrical Reference Drawings Grounding

Plan

The reference drawings don't appear to include a switchyard grounding plan. Will one be available after award for use in coordinating repairs to the ground grid after demolition work in the switchyard?

On: Jan 28 2021.

Government Response. . Reference drawing 5820-134-1852 "Switchyard Grounding" is included in the reference drawings. On: Feb 05 2021

9033881 Electrical Underground

Conduits

Should underground conduits be PVC or PVC coated rigid? There is a note for the conduit going to the heater in the oil water separator coming from the tunnel that states rigid, but typically rigid metal conduit is not used for underground unless it is coated. Other underground conduits shown on the drawings are not specified either way.

Government Response. . Rigid metal conduit is specified to be galvanized inside and outside (section 26 05 00.00 26, paragraph 2.2.1). Section 26 05 00.00 26 has been amended to require supplementary corrosion protection where new conduits emerge from concrete into soil/gravel. The amendment also specifies the use of RMC for all new conduits. On: Feb 05

9033888 Contracting Small Business

Participation Plan

We respectfully request the Small Business Subcontracting Plan be accepted in lieu of the Small

Business Participation Plan. The Subcontracting Plan provides the same information as the Small

Business Participation Plan.

Government Response. . In accordance with regulation and the Source Selection

Evaluation Criteria, a Small Business Participation Plan is required from all offerors. A

Subcontracting Plan is only required from other than small offerors. Each document is evaluated against its own set of requirements, and therefore, are both required as applicable.

On: Feb 05 2021

9036723 Geotechnical SECTION 13 48 00.00 26 part 1.5

It is mentioned in the seismic analysis specifications that the GSU transformer manufacturer will design the anchorage for the new transformers. Can you confirm if the GSU transformer foundation design will be completed by the GSU manufacturer including the steel re-enforcement for the new foundation. Or does the contractor as part of this solicitation need to provide engineered design for the

GSU foundation and steel re-enforcement?

On: Jan 29 2021.

Government Response. . The GSU manufacturer will provide seismic forces and load cases which will result in maximum uplift and base shear forces. The GSU manufacturer will provide weld size and locations for anchoring the GSU to the embedded steel plate in the concrete foundation. The GSU manufacturer seismic and anchorage design will be provided to the GSU installation Contractor (this Contract). It is the GSU installation Contractor's (this

Contract) responsibility to design the features of work shown in these contract drawings and specifications. On: Feb 05 2021

9036746 Geotechnical SECTION 03 30 53.00 26

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Is there an existing geotechnical report or soil borings that can be provided to aid in the final design and analysis of the new GSU transformer foundations?

On: Jan 29 2021.

Government Response. . Geotechnical data from original dam construction circa 1940 is included in amendment 0002 of the solicitation. On: Feb 05 2021

9037277 Electrical oil water separator

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Is the oil inside the oil water separator PCB contaminated?

Government Response. . The Toxic Substance Control Act (TSCA) defines a Non-PCB transformer as: Any transformer containing less than 50 ppm PCB.

Attached are PCB test results for Norfork transformers from 1986 and 2012.

The 1986 tests are for all Norfork transformers and oil circuit breakers (removed in 1988 [4]

& 1995 [5]). Transformer 1B contained 6 ppm PCB and the other 6 samples contained 4 ppm or less.

The 2012 tests are for transformer 2C which is the primary & probable sole source of potential contamination referenced in RFI 9037277. Of the nine PCB types tested, 8 were below the detection threshhold (2.0 ppm). One PCB was detectable (PCB 1260) at 2.6 ppm.

When Norfork transformer oil addition has been required, it has been PCB free new oil.

The oil containment system and oil-water separator were installed circa 1990, after the 1986 tests. The sources of contamination for this system were tested as non-PCB.

The primary indication of the source of oil in the oil-water separator in RFI 9037277 is oil in the containment system beneath and adjacent to transformer 2C, which was retested as non-

PCB

in 2012.

The reference tests provide evidence the oil of concern in RFI 9037277 is not contaminated.

Testing data is provided with amendment. On: Feb 05 2021

Information for this report is procurement sensitive.

9037279 Electrical oil water separator

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Is it a requirement to clean the inside of the oil water separator vault before completing the modification inside?

Government Response. . Yes, cleaning of the oil water separator will be required before concrete work. Refer to amended drawing SD401. On: Feb 05 2021

9037281 Electrical

Transformer foundation drawings

Transformer foundation drawings provide horizontal dimensions and top of concrete elevations. Please provide bottom of concrete elevations.

Government Response. . Bottom elevations are found in the contract drawings and reference drawings. On: Feb 05 2021

9037283 Electrical S-101 Detail A

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

S-101 Detail A calls out Note 5. There is not a Note 5 on this drawing.

Government Response. . The callout for Note 5 on S-101 is a mistake and may be ignored.

Refer to amended drawing S-101. On: Feb 05 2021

9037285 Electrical S-102

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

S-101 states "Connect into existing concrete curbing following detail shown on S-502". S-502 only provides bus penetration details.

Government Response. . The callout cites the wrong sheet; the correct sheet for the callout is S-102. Refer to amended drawing S-101. On: Feb 05 2021

9037287 Electrical drawing S-102.

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Please provide product / details for T shape shown in detail 1 on drawing S-102.

Government Response. . This is a Contractor design feature. Refer to amended drawing S-

102 with adjusted callouts. On: Feb 05 2021

9037288 Electrical New containment wall

New containment wall is tying into existing containment structure. However, specifications state that we must perform a containment test by filling the containment tank. If the test was to fail, how are we to know where the leakage is occurring? From our new structure or the existing structure?

Government Response. . It is the Contractor's responsibility for development methodology to verify the joints are sealing correctly. On: Feb 05 2021

9037291 Electrical transformer containment area

Concerning the transformer containment area that is over the cable tunnel. The only way that I could see waterproofing this area is by using a waterproofing coating or liner. There is not any information provided for waterproofing this area.

On: Jan 29 2021.

Government Response. . The containment area must be fully waterproofed to prevent any leakage. Refer to amended drawings and specification section 03 64 23.00 26. On: Feb 05

9037293 Electrical contract documents

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The contract documents indicate the contractor is responsible for designing the foundations for the transformers. The documents refer to determining bearing capacities per EM-1110-1-1905. That document requires values obtained from a geotechnical investigation in order to determine allowable bearing capacities. The contractor requires geotechnical data in the Switchyard area so the in order to quote the design and subsequent installation of the transformer foundations and containment?

9037295 Electrical Section 31 05 19.16 26

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The existing reference drawings show a flexible waterproof membrane that lines the oil containment area. The contract drawings indicate waterstops at new concrete joints, but do not show waterproofing items at existing concrete joints. Specification Section 31 05 19.16 26 states "The secondary oil containment system shall include extending the new curbing, providing an imperious liner, and ."

Please confirm that the new impervious liner is intended to be positioned over the entire area of the existing and extended oil containment areas. Also confirm there are not any more items that were intended to be added after "and" in the quoted statement.

Government Response. . Specification section 31 05 19.16 26 was errantly included in the specifications and has been removed. On: Feb 05 2021

9037297 Electrical Sheet S-101

Sheet S-101 indicates the Contractor is responsible for designing the GSU Pad. Note 2 indicates drilled piers may be required, while the conceptual drawing indicates the transformer foundation and slab resting on the modified existing transformer foundations. There is not currently enough information to determine a competitive price for the design and installation of the transformer foundations without more information on which to base a bid. The contractor must have geotechnical information and material quantity information of sufficient detail to develop a competitive bid?

On: Jan 29 2021.

9037333 Contracting SF-1442 - Technical

Proposal

There were a few RFIs requesting changes be made to the technical proposal on the Norfolk Dam

Electrical Modernization project (W9127S21R0002). These RFIs are requesting to increase the page limitations for subfactor 1.3, 1.4, and factor 2 (RFI 9028868, 9028870, 9028872) . We are respectfully requesting that the initial requirements for the proposal remain unchanged for this solicitation.

We believe that the original technical proposal format and limitations allow for accurate vetting and comparison of bidder qualifications. Any change to the project technical proposal requirements at this stage of the solicitation would likely detract from the original intent of the proposal of "being prepared simply and economically, providing a straightforward and concise description of capabilities to satisfactorily perform the requirements." We can understand the need for a more detailed schedule

(greater than 75 line items) and fully intend to submit an integrated schedule should we be awarded the project, but making the change at this point would likely cause confusion and delays in evaluating the proposals.

Additionally, we have taken what believe to be the most important details regarding the procurement, installation, planning, and construction of each of the subfactors and made a significant effort towards clearly communicating these in a way that shows we understand the scope, specifications, and requirements of the project while being within the original limitations of the technical proposal.

Kind Regards, Brandon Lackey, PE

Midwest Electrical Construction, Inc.

Government Response. . Page limitations for solicitation section 00 22 16's Factor 1.3, Factor 1.4, and Factor 2 will be expanded. On: Feb 05 2021

9037764 Electrical MV Circuit breaker rating

MV Circuit breaker rating: Please clarify that 3000A breaker rating is required as noted in specifications 26 13 13.00 2.2.2 and 2.2.3. This is being asked because all CT's are shown to be 2000:5

Government Response. . 3000A continuous rating breakers are specified and required. On:

Feb 25 2021

9037768 Electrical E-103

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing E-103 shows max depth to be 86.25". The max depth must be increased to at least 96.25" for the following reasons:

a. Breaker rating of 3000A requires 96.25" depth to meet Metal Clad IEEE requirements IEEE

C37.20.2.

b. Bus designed to meet powerflow diagram on E-211 and E-212 requires use of rear compartment area. This requires the additional depth to maintain required clearances per metal clad switchgear IEEE requirements IEEE C37.20.2.

c. Surge protection caps / arrestors are not drawer mounted in metal clad design as shown on E-211 and

E-212. These are mounted in rear compartment, requiring the additional depth.

Government Response. . Changes to the arrangement and maximum dimensions of the

15kV switchgear are included in Amendment 0004. On: Feb 25 2021

9037770 Electrical E-211 and E-212

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Surge protection caps / arrestors are not drawer mounted in metal clad design as shown on E-211 and

E-212.

Government Response. . Surge arrestors and capacitors are not shown as withdrawable auxiliaries on E-211 and E-212. On: Feb 25 2021

9037774 Electrical E-211 and E-212

In order to make sure there is proper clearance for nonseg bus connections (not interference between generator bus and GSU bus) the layouts as shown on E-211 and E-212 will have to changed . All nonseg bus connections are currently made in rear section of metal clad switchgear per IEEE C37.20.2.

Drawing E-103 shows GSU nonseg bus connected to front of gear and in front of the generator nonseg bus. This layout is not achievable with Metal Clad design requirements of IEEE C37.20.2. We need confirmation that the layout can be modified or direction from the government on how to address the bus conflict.

On: Jan 29 2021.

Government Response. . The original intent shown on E-103, E-211, and E-212 is bus connected to the primary (rear) compartment of the switchgear sections and passing overhead roughly above the center of the sections to match up with the downstream wall penetrations to the cable tunnel. Changes to the arrangement 15kV switchgear, excitation equipment, and

HRG at Elevation 396.0 are included in Amendment 0004. On: Feb 25 2021

9040407 Electrical Drawing E-103

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Drawing E-103 calls for chain link fence and gates to be installed. However, there are no specifications for details for this fence.

On: Feb 01 2021.

Government Response. . Changes to the arrangement 15kV switchgear, excitation equipment, and HRG at Elevation 396.0 are included in Amendment 0004. Chain link fence as originally indicated on E-103 is no longer required. On: Feb 25 2021

9040408 Electrical 48 70 01.00 26 Paragraph 1.4.3

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

Specification 48 70 01.00 26 Paragraph 1.4.3 requires contractor to provide MOD 27. This has to do with the governor which is not a part of this project. Should this be removed from the requirements?

On: Feb 01 2021.

Government Response. . At this time, it is the intent to proceed with all model validation testing and reporting as specified in order to align NERC Compliance reporting among different pieces of equipment. The requirement for MOD-027 will not be removed at this time. On: Feb 05 2021

9065565 Electrical Follow-up to

9028880

Follow-up to 9028880: It is still not clear who is developing the complete functional checklist for commissioning.

On: Feb 16 2021.

Government Response. . The complete functional checklist to be performed as part of

"Government Testing" per 26 08 01.00 26 paragraph 3.4 will be developed by the

Government. Paragraph 3.4 of section 26 08 01.00 26 has been updated clarifying the responsibilities of the Contractor and the Government. On: Feb 25 2021

9065567 Electrical

9028886

Follow-up to 9028886: Response states total estimated length of crack sealing is expected to be approximately 150 linear ft. Amended section 03 64 23.00 26 states both 150 linear feet and 120 linear feet. How many linear feet should be included in the proposal? Will payment be made per foot or lump sum? What CLIN should this work be included under?

Government Response. . The citations of 120 linear feet are incorrect in section 03 64

23.00 26 paragraph 3.2. 120 linear feet is corrected to 150 linear feet in Amendment 0004.

Cable tunnel concrete crack repairs are listed under CLIN 0011 in section 01 22 00.00 10.

On: Feb 25 2021

9065568 Electrical

9028892

Follow-up to 9028892: Response states contractor is required to remove all contaminated material. The amount of contaminated material cannot be quantified until excavation. The cost per yard to dispose of

3 yards of contaminated material is different than the cost per yard to dispose of 100 yards of contaminated material. We must be given a quantity to base our proposal on so that all bidders include the same.

Government Response. . Section 02 84 33 Removal of PCBs will be updated to remove the requirement for the project based on the previously supplied testing data. On: Feb 25

9065570 Electrical

9036746

Follow-up to 9036746: The geotechnical data provided appears to be intended for the design of the primary dam concrete bearing directly on rock. There were some rock strength values provided.

However, it appears the existing transformer foundations in the switchyard bear on soil (listed as overburden) which is several feet thick above the rock level. We performed preliminary calculations for the bearing pressures of the existing transformer foundations and compared them to the bearing pressures of the anticipated new transformer foundations. The bearing pressures of the proposed system produced significantly greater pressures due to increased system weights. The increased bearing pressures on the existing shallow footings, as shown in the conceptual design in the contract drawings, would likely lead to unacceptable differential movement between the new concrete structure and existing concrete structure. Since the project involves watertight joints at the interface between new and existing concrete, differential movement potential needs to be limited to a small level. The only feasible solution to limit the movement potential of the new foundations is to install deep foundations into rock. Deep foundation options include conventional piers or micropiers. The foundation designer needs geotechnical data (provided by the Government) for the soil above the rock layers and the rock itself. This information is essential prior to bid in order for the contractor to estimate the number and type of piers required.

Government Response. . The Government has provided all the geotechnical information on hand. Contract drawings indicate over excavation and removal of existing foundation and use of drilled peers may be required. On: Feb 25 2021

9065576 Electrical Transformer

Shipment

The transformers are too tall to be practically shipped over the road without reducing the height to under 13.5'. We plan to remove the bushings and radiators onsite, but the unit will still be over 16'. Can the bolted 2.5' top section of the transformers be removed at the site? This will only require removal of bolts, no cutting or grinding is required.

Government Response. . Yes, the top section of the existing transformers may be removed onsite. If accomplished in this manner, this detail should be included within the Transformer

Removal Procedure per section 48 19 23.00 26 paragraph 3.1.3. On: Feb 25 2021

9065577 Electrical

9037288

Follow-up to 9037288: Is it a requirement to seal the existing structure? If so, what are the requirements?

On: Feb 16 2021.

Government Response. . The existing structure must be sealed to prevent any leakage of oil/water. On: Feb 25 2021

9065581 Electrical

9037291

Follow-up to 9037291: Since the existing method of waterproofing over the cable tunnel involved using a flexible liner and that method of waterproofing is proposed to be removed, it may be difficult to ensure watertightness of the cable tunnel without identifying leaks that could allow water infiltration into the cable tunnel during the waterproofing process. Using hydrophilic grout could require future maintenance when cracks grow or develop in the future and application of additional grout will likely be needed if new leaks were detected in the future. Is the Government's intention to waterproof the area over the cable tunnel only by sealing cracks in concrete or does the Government intend to use a waterproof liner or membrane to waterproof the area over the cable tunnel?

Government Response. . The contract package assumes waterproofing the area by sealing any cracks in the concrete. On: Feb 25 2021

9065586 Electrical

9037295

Follow-up to 9037295: Clarification has been provided for the question, but please see the comment to item 9037291.

Government Response. . The contract drawings and specifications do not either prohibit or mandate the use of a flexible waterproof liner. The contract drawings are conceptual and the design must be developed by the Contractor and approved by the Government. Ultimately, the containment area must be fully waterproofed to prevent any leakage. On: Feb 25 2021

9065589 Electrical

9037297

Follow-up to 9037297: Additional geotechnical information is required to evaluate existing foundations or design new foundations. Please see comments to item 9036746.

On: Feb 16 2021.

Government Response. . The Government has provided all the geotechnical information on hand. Contract drawings indicate over excavation and removal of existing foundation and use of drilled peers may be required. On: Feb 25 2021

9065592 Electrical Bid Extension

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

There are several questions still open that are critical to obtaining switchgear quotes. We request the contractor be given at least two weeks after all questions are answered for proposal deadline in order to obtain responsive quotes from vendors.

Government Response. . Changes to requirements for the 15kV switchgear as well as answers to related inquiries are included in Amendment 0004. On: Feb 25 2021

9071735 Contracting ProjNet

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

We request that the ProjNet stay open until the current unanswered questions are answered. This will allow for follow-up to questions as required.

On: Feb 18 2021.

Government Response. . Contractors should take posted government responses to RFIs into consideration and submit their proposal(s) accordingly. On: Feb 25 2021

9071956 Electrical E-201 Section 26 20 00.00 26

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The specifications for the panel boards mentions UL 50, since the panel boards will need to be mounted in customer enclosures they will not meet UL 50, but rather UL 508A. Please confirm that panelboards

SSBDA, SSBDB, SSBDC, SSBD3, and SSBD6 built to and labeled per UL 508A is acceptable.

Government Response. . Considering the configuration of the referenced panelboards in custom enclosures, it is recognized that panels built and labeled per UL 508A is equivalent to

UL50 for this application. Panelboards SSBD3, SSBDA, SSBDB, SSBDC, and SSBD6 may be built and labeled per UL 508A vice UL 50. An update to Section 26 28 00.00 26 is included in Amendment 0004. On: Feb 25 2021

Current Request Status: Request Closed

Information for this report is procurement sensitive.

9071973 Electrical E-201 Section 26 20 00.00 26 part 2.2.4

Comment Classification: Unclassified\\For Official Use Only (U\\FOUO)

The…