140R3021R0019_A0003_-_KN6A___KN8A_Transformer_Rehabilitation_-_Q_A_with_attachments_0003.pdf

United States Department of the Interior

BUREAU OF RECLAMATION

P.O. Box 61470 Boulder City, NV 89006-1470

LCB-10300 July 21, 2021 1.3.11

VIA ELECTRONIC MAIL ONLY

Subject: 140R3021R0019 Amendment 0003, KN6A and KN8A Transformer Rehabilitation, Questions and Answers

In response to the recent site visit held on July 7, 2021, the following questions were asked by interested parties and responses are provided as follows:

Question 1: Who responsible for the removal of bushing and studs in the transformer, after opening?

Answer: Contractor is responsible to remove the bushings from the transformer and replace with new bushings and necessary hardware. Reference Section 2.3 B of statement of work.

Question 2: What is the weight max and length of equipment for the dam crane?

Answer: Maximum weight is 150 tons. Length platform/cradle is 52 feet. If equipment has rigging provisions, then cradle would not be needed and would depend on length of rigging straps.

These can be supplied by contractor.

Question 3: What is the name of the manufacturer of replacement bushings?

Answer: ABB

Question 4: What is the minimum background clearance (PIV)?

Answer: Please see RFP Section I.23.

Question 5: What is the max trailer length for the Cableway Crane?

Answer: 52 feet.

Question 6: What are names of the previously used crane companies?

Answer: DIELCO

Question 7: What power sources are available in the working area?

Answer: 480 VAC at 30 Amps and 120 VAC

Question 8: For the Option. Is there a Rapid Depressurization hole welded on place adapter piece (welded on circle opening/manhole cover plates)?

Answer: No hole or cover is present for the Rapid Depressurization. Please refer to attached photos. This addresses a manhole cover is not present for installation of the DBI SALA base plate.

Question 9: Transferring and draining/intermingling or oil transformers. Return clean?

Answer: Preference is to prevent intermingling of oil between transformers.

Question 10: Is there any lead paint involved in tasks associated with the performance of the SOW?

Answer: No known lead paint. The exterior of the transformer can be tested for lead paint if necessary. Locations would need to be determined prior to work taking place.

Question 11: Is there an emergency evacuation plan available?

Answer: Yes, there are emergency procedures in place for evacuation of personnel which will be provided to the awardee at the post award conference to ensure safety for all personnel on site.

Question 12: Who is responsible for the disconnection of bust/flex links? BOR or contractor?

Answer: BOR will disconnect the bus/flex links and the high side and neutral connections.

Question 13: Is changing out the heat exchangers part of the contract?

Answer: Yes, replacement of the heat exchangers with new is required under this contract.

Question 14: What other transformer companies have been to the dam?

Answer: Shermco has been to the site.

Question 15: Are there any past oil samples showing the current level of inhibitor in the oil to estimate the amount needed?

Answer: Provided in Amendment 0003 as Attachment 3 – DGA Tests.

Question 16: What oil testing is required at project completion?

Answer: Contractor will need to provide DGA tests on all transformers showing the condition of the oil after the work is completed. This will include inhibitor level and appropriate tests.

Question 17: It was mentioned at the site visit that photos of the of the top of the transformers would be provided, will they be included in Amendment 2?

Answer: Photos are posted with Amendment 0003.

Question 18: Will the Government consider a two-week extension to the proposal date to allow for offerors to gather the information necessary to prepare their proposal?

Answer: Amendment 0002 extended the proposal due date from July 21 to July 30, 2021.

Question 19: The specification states scaffolding. Are there any restrictions for using a manlift in conjunction with ladders?

Answer: There are no restrictions to using a manlift with ladders provided the contractor follows OSHA and Reclamation Safety and Health Standards (RSHS) when using this equipment.

Question 20: May we please have a copy of historical oil results?

Answer: Provided in Amendment 0003 as Attachment 3 – DGA Tests.

Question 21: Is there a list of site visit attendees for potential subcontracting purposes?

Answer: A copy of the site visit sign in sheet is included with Amendment 0003.

Question 22: Can all three phases be worked on simultaneously on both KN6A and KN8A?

Will the outages for A, B and C phase be 30 days in total and together or 10 days each and consecutive?

Answer: Yes. The outages are 30 days for each bank of transformers. Please note that only one bank will be de-energized at one time. Work cannot start on the second bank until work is completed on the first bank.

Question 23: Is there a target/preferred start date for KN6A and KN8A?

Answer: The KN6A outage is scheduled to start February 1, 2022. The KN8A outage is scheduled to start January 4, 2022. KN8A will be the first bank the contractor can work on until the work is completed on KN8A.

Question 24: Is there ample room adjacent to each phase in the work area for the placement of frac tanks for oil storage if all phases are to be worked on simultaneously?

Answer: The area is tight. Contractor is responsible for moving equipment around at the job site. The preference is to have enough containment to handle one transformer at a time. If multiple tanks are drained at the same time, the contractor is responsible for moving oil tanks around to facilitate refilling of the transformers.

Question 25: Has there been a similar project in the recent past? If so, is there any information available for equipment placement under similar circumstances (boom trucks, large truck and trailers, frac tanks, etc.)?

Answer: Bushing replacements have been performed in the past. This rehabilitation is the first of it’s kind to the CORs knowledge. Some parts may have been replaced, but there is no list to show which parts have been replaced.

Question 26: Are there site approved vendors? For example, boom truck rentals, oil storage rentals?

Answer: Site is open to all vendors. Contractor is responsible for the condition of the rentals brought to site, and any spills or debris created by the rentals.

If you have any questions regarding responses to the questions above, please contact Perry Harris, Contract Specialist, at pharris@usbr.gov, or the undersigned at aamador@usbr.gov.

Aimee Amador Contracting Officer

Attachments:

1. Site Visit Sign-in Sheet, 7/7/2021

2. Photos from Site Visit, 7/7/2021

3. DGA Tests, 3/13/2019