A22_W912P919R0044_Amend_4.pdf

W81C8X91150348

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

The purpose of this amendment is to extend the closing date from 28 August 2019 to 20 September 2019 along w ith posting Questions and Answ ers No. 3. There are no other changes.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 7

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

16C. DATE SIGNED

BY 23-Aug-2019

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 W912P919R0044

X 9B. DATED (SEE ITEM 11)

25-Jul-2019

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

23-Aug-2019

CODE

CONTRACTING DIVISION

US ARMY ENGR DIST ST LOUIS

1222 SPRUCE STREET, RM 4.207

ST LOUIS MO 63103-2833

W912P9 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

W912P919R0044

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

SECTION SF 30 - BLOCK 14 CONTINUATION PAGE (SF 30)

The following have been added by full text:

Questions and Answers No. 3 Pre-proposal Questions 15 Aug 2019

*Closing Date is extended till 20 September 2019 at 10AM CST.*

Please Note: Below are questions received prior to 15 Aug 2019. Unanswered questions will be addressed with revised specifications in a forthcoming amendment.

SECTION 00 08 00

Q1: 1.19.4 Please clarify the significance of the January 15th completion date. If the contract award is made say September 30th, 2019, the contract completion date would extend beyond January 15th, 2021 as the performance period is listed as 532 calendar days from Notice To Proceed. Is the date related to the maximum 60 days per unit outage window and the restricted outage window June 15th - September 15th? Is it possible to extend the Jan 15th date to February 28th and increase the outage window for the first unit, which typically takes longer time than the 2nd unit?

Answer 1: Please find additional information in question 4 answered in Amendment 3.

The contract duration includes additional time beyond 15 Jan 2021 to provide for any onsite work not critical to the function of the digital exciters and contract closeout activities.

The 15 Jan date has been coordinated with the Southwest Power Administration (SWPA) and it cannot be extended. SWPA typically restricts plant outages from 15 Dec through 15 Mar, but has delayed this restriction to provide the 120-day installation window and permit back-to-back installation of both exciters.

2. 1.19.23 Please clarify if the 50 reference drawings in raster format means that they are scanned drawings

(.TIFF, .PDF format etc.) and that the Contractor needs to convert of re-draw the drawings into Microstation (.DNG format)? Also, do the 50 drawings include drawings for both units or are there 50 drawings per unit?

Answer 2: The reference drawings are in a TIFF format.

Per the bid schedule, it is 50 drawings total.

3. 1.19.24 Please clarify how many .xls sheets of conduit/cable schedule that are required to be updated.

Answer 3: Drawings ED604 and E-605 identify the cables to be demolished and installed as part of the contract. These cables schedules should be indicative of the amount of effort needed to update the spreadsheet.

SECTION 02 82 14

4. 1.1 Is there a previous report available that identifies the location of any Asbestos Contacting Materials (ACM)? Is the ACM only applicable to the external cabling to the existing exciter cabinet, or does it also include internal wiring and/or components inside the existing exciter ?

Answer 4: See the answer to Question 5 posted under Amendment 3.

The external cabling for the field and armature circuits from the exciter and regulator are known to be ACM. It is believed wiring internal to the exciter/regulator is also an ACM.

SECTION 25 05 11.00 28

5. 1.8 Please confirm that HMI panels (paragraph 2.7.3 in SECTION 48 19 26.00 26) are required to operate with an Operating System that is currently supported by Microsoft, such as, Windows 10. We assume that HMI panels operating with Windows XP or older versions operating systems that are not supported by Microsoft anymore would not be acceptable since security patches would not be up to date. Please confirm.

Answer 5: The requirements of paragraph 1.8 are applicable to personal computers and network servers.

They do not apply to an embedded operating system for an HMI required in paragraph 2.7.3 of Section 48 19 26.00 26.

SECTION 26 25 00.00 26

6. 2.1.5 We understand that seismic calculations are required for the bus duct structure in order to select suitable anchors. Please confirm.

Answer 6: In accordance with Section 13 48 00.00 26, paragraphs 1.3, 1.6, and 3.4, seismic calculations are required for bus duct. Concrete anchor testing is required for all concrete anchors, including those used to in seismic support structures of bus duct.

SECTION 48 19 26.00 26

7. 1.1.4 Given the fact that unit 2 can operate as both generator and motor, should the proposed system have the ability to switch to separate AVR settings, limiters etc, based on a digital input indicating if the unit will operate as a generator or a motor?

Answer 7: In accordance with Section 48 19 26.00 26, paragraph 3.3.8.3, the system shall be capable of starting and operating in pump mode. The specific implementation of this feature is left up to the Contractor, but shall still be subject to the requirements of the specification.

8. 1.1.5 Please clarify if the five (5) year warranty will start at the acceptance for each unit, or at the acceptance of the overall contract.

Answer 8: The warranty shall start upon acceptance of the unit by the Government.

9. 1.4.3 What is the available spare capacity of the 125Vdc panel that can be used for the new field flashing circuits? Is there space in the panel for one field flashing breaker per unit, 60Adc each?

Answer 9: Per the referenced specification paragraph, the existing circuits are rated at 30A. If a larger source is required, the Contractor shall provide new breakers. The existing panelboard make and model has been provided in the same paragraph.

10. 1.4.4 Please clarify if it is the Government's or the Contractor's responsibility to install three (3) new CTs per unit.

Answer 10: The Contractor shall install three new CTs per the specifications and drawing E-604.

11. 1.4.6 Please clarify if the Contractor is required to install an Ethernet cable from each exciter to the control room for future SCADA interface?

Answer 11: Installation of Ethernet for future use is not required.

12. 2.1 The ambient design temperature is stated as 40 degrees C. Please confirm if this is correct, considering the location of the power plant, where outside temperature can reach above 40 degrees C and power plant temperatures may reach a few degrees higher.

Answer 12: The ambient design temperature of 40 degrees C for the plant floor is correct.

13. 2.4.4 There is no requirement for space heaters / thermostat for the PPT enclosure. We suggest that this requirement is added to prevent moisture build-up.

Answer 13: If the Contractor desires, space heaters and thermostats maybe included in the PPT enclosure, but this is not a requirement of the contract.

14. 2.4.6 We understand that the requirement is to wire a temperature alarm contact, a temperature trip contact and a 4-20mA PPT temperature signal to the excitation controller and that the information should be displayed on the HMI panel and be available on MODBUS. Please confirm.

Answer 14: Internal wiring and communication between the PPT and the exciter cubicle is at the discretion of the Contractor within the confines of the specification. Modbus is to be used for communication external to the excitation system.

15. 2.5.2 Please confirm if fully tin-plated copper bus bars are acceptable vs bare copper bus bars with silver-plated connections. Copper bus bars with complete tin-plating reduces the risk of oxidation of the copper surface over time.

Answer 15: Tin-plated copper bus bar is acceptable, but not required for this contract. However, silver plated connections are required in accordance with Section 48 19 26.00 26, paragraph 2.5.2.

16. 2.5.9.2 For clarification, we understand that each six-pulse rectifier bridge shall have it’s own independent redundant cooling fans. A common set of redundant fans serving multiple rectifier bridges would not meet this requirement. Please confirm.

Answer 16: In accordance with Section 48 19 00.00 26, paragraph 2.5.9.2, rectifier assembly cooling shall consist two sets of fans for each rectifier assembly. The fan sets are each to be suitably sized to cool the rectifier assembly (redundant fan sets).

17. 2.6.1 With the requirement: Provide two fully independent and identical control channels, we understand that either control channel shall be able to control either rectifier bridge. Hence, a control channel should not be dedicated to a particular rectifier. Please confirm.

Answer 17: The contract does not specify, therefore either configuration is acceptable.

18. 2.7.3 With the requirement “Provide an additional user-selectable display on the HMI which clearly displays configuration parameters (to include protective settings and tuning parameters at a minimum” we understand that the user shall be able to view/change these settings directly from the HMI without having the need to connect a separate laptop. Please confirm.

Answer 18: The contract does not specify, therefore either configuration is acceptable.

19. 2.9.3 The specification allows for either copper or aluminum conductors, while section 26 25 00.00 26, specify only copper conductors. Please confirm which requirement that is correct.

Answer 19: Non-segregated phase bus should be in compliance with 26 25 00.00 26 Bus Structures.

20. 2.10 Please specify model number of the brush holders and brushes that are currently in use.

Answer 20: See the answer to Question 7 posted in Amendment 3.

21. 2.14 Should item (a)complete rectifier bridge assemblies be a “ready drop-in replacement” including the same mechanical frame, 6 SCRs, 6 fuses, snubber circuits, all monitoring (temperature, flow, failed fuse etc.) and redundant cooling fans. If so, should item (p) four cooling fans still be furnished separately?

Answer 21: Such a design is acceptable, but not required. Spare part should be supplied to completely satisfy Section 48 19 00.00 26, paragraph 2.14, but may be supplied as individual components if that is how they should be installed.

22. 3.1 The contract drawings indicates that the DC bus duct shall enter the collector ring housing at about 2-

3 feet height. Is this the government’s preferred routing? Another option would be to enter the collector ring housing closer to the generator floor plates, remove all exciter field poles and connect cables from the bus duct to the collector ring stubs. In either case, the bus duct needs to be removable in case of generator work. Please confirm if this routing is an option and if it would be more preferable by the government from a serviceability point of view. In particular for unit 1, being a “visitor unit with plexiglass around”, it may make sense to have a routing that provide as little obstruction as possible.

Answer 22: The Contractor shall bid the design as shown in the contract drawings. An alternative design may be entertained following award, but would be subject to Government approval.

23. 3.3.3.2.a Please confirm that the reference to PPTs here refers to the 25kVA 480/240V transformer used for the old exciter (page 7713952 in the reference drawings and page ED101 in the plan drawings).

Answer 23: The 480/240V transformer shown on reference drawing 771395-2, sheet 12 of 31, shall be removed as part of the existing excitation cubicle. The PPTs identified on drawing ED101 are the Station Service Switchgear transformers and shall remain.

24. 3.3.3.2.a In order to provide a more accurate cost related to the removal of the existing excitation systems, we are asking for more information, as follows. As the existing excitation cabinets do not fit through the doors out to the turbine floor, they would need to be cut in smaller sections. Please confirm if there is any asbestos related material inside the excitation cabinets or if the asbestos only pertains to the external cables. If the existing cabinets have internal asbestos wiring or components contacting asbestos, such material would need to be abated, which would require a tent with negative air pressure etc. If so, should the entire cabinets be considered asbestos contaminated? Is the weight of the existing cabinets known, as asbestos disposal cost is directly related to the weight being disposed.

Answer 24: Testing was performed on insulation for wiring leaving the excitation cubicle (ED605). The insulation tested positive for asbestos, but it is in a non-friable condition. A similar insulation material was found on wiring internal to the excitation cubicle, but was unable to be tested. It is assumed to also contain asbestos.

The weight of the existing cabinet is unknown.

25. 3.3.3.2.e The specification asks for exciter commutator brush rigging and supports to be removed. Would the exciter field poles also need to be removed (question related to 3.1)?

Answer 25: The exciter field poles may be removed if necessary for Contractor design, but removal is not required as a part of this contract.

26. 3.3.3.2.f We were not able to inspect the 13.8kV location for the existing CT that needs to be removed and 3 new CTs to be procured and installed by the contractor. Would it be possible to show a photo of the location to determine the space available for the new CTs?

Answer 26: See the answer to Question 6 posted in Amendment 3.

27. 3.3.3.3 Please provide estimated height of the cable tray serving the cables between the existing exciter and unit control board. Based on the site visit, we estimate the distance to be 20-25 feet in which case scaffolding etc. needs to be built to allow for safe removal of asbestos cables as well as for installation of new conduit/tray from the new exciter location to the unit control board.

Answer 27: See drawing S-CC 56/165 on page 18 of 64 in the Reference Drawings.

28. 3.3.7 Previous USACE excitation contracts have included collector ring inspection and replacement of brushes/holders in the base bid and collector ring refurbishment as an option, typically as separate costs for refurbishment in place and refurbishment off-site. Once the collector ring inspection is performed, the subsequent report will provide information regarding the proposed refurbishment, depending on the severity of the grooving of the collector ring. In the event the grooving is severe, the collector rings would need to be removed and machined off-site, which will require more demolition work, in particular for the Kaplan unit. Please clarify if we should provide a proposal for refurbishment in place or alternatively if we should factor in the worst case scenario, in case the inspection determines that the collector rings need to be removed.

Answer 28: The option to refurbish the collector rings in place or office is to allow for the standard practice of the Contractor and is not reflective of the severity of damage.

29. 3.3.7 Please clarify if the exciter field poles shall be removed to provide access for the DC cables to connect from below in addition to the removal of the commutator brush rigging and supports.

Answer 29: Some or all of the field poles may be removed if necessary for the Contractor’s design.

30. 3.3.8.3 and 3.3.8.4 In the event that there is not sufficient water or in the case of other external factors to the excitation system that limits the generator output at the time of commissioning, please clarify if it is the Contractor’s responsibility to cover the cost of additional trips or if such trips will be handled as change orders.

Answer 30: It is not anticipated that the Contractor would not begin commissioning if the generator output is limited by any factors. If additional trips are required due to factors not caused by the Contractor, they will be handled on a case by case basis.

(End of Summary of Changes)