W50S9822B00020003.pdf

PSXE172003

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

REASON FOR AMENDMENT: Attach qusetions and answ ers.

1. Question and Answ ers 1-68 are hereby incorporated in to this solicitation.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 11

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

16C. DATE SIGNED

BY 09-Sep-2022

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 W50S9822B0002

X 9B. DATED (SEE ITEM 11)

15-Aug-2022

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 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 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

09-Sep-2022

CODE

USPFO TN 134 MISSION SUPPORT CONTRACTING

123 BRISCOE DRIVE

MCGHEE TYSON ANG BASE TN 37777-6227

W50S98 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

W50S9822B0002

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

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

The following have been modified:

QUESTIONS AND ANSWERS

PV Array Q&A

1. Please provide a slope stability analysis report if available.

A: A slope stability analysis is not currently available

2. If a slope stability analysis report is not available, please confirm subcontractor is not responsible for the completion of the analysis.

A: The current documents do not require the contractor to complete a slope stability analysis.

3. Add-Alternate PV system exceeds inverter manufacturer DC/AC ratio and max DC input. Please provide design information for the Add-Alternate PV system or confirm that an additional inverter would be required to not exceed manufacturer limits.

A: As noted in the alternate descriptions, provide the required items for a complete and fully working system

4. Please confirm that Aluminum conductors are allowed to be used in low voltage and medium voltage circuits.

A: See specification sections 26 0513 -MEDIUM-VOLTAGE CABLES and SECTION 26 0519 LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES, for types and use of cable materials

5. Please confirm copper conductors may be utilized instead of aluminum in electrical circuits.

A: See specification sections 26 0513 -MEDIUM-VOLTAGE CABLES and SECTION 26 0519 LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES, for types and use of cable materials

6. Please confirm the number of modules for the solar array system. E2.0 indicates 1824 modules while

E2.1 indicates 792 modules.

A: Follow the module layout as indicated on sheet A2.1 for what is in base Bid (Subarray 1-4). In addition, alternate subarrays are identified in the Alternates descriptions.

7. Please confirm a revenue grade meter is optional.

A: The Optional Revenue Grade Meter, identified on Sheet E5.1, shall be provided as part of the project.

8. Please provide clarification if the 2000 A PV switchboard will still be required if the Add-Alternate

PV system is not pursued.

A: Yes, the larger infrastructure is to remain to allow for expansion of the system in the future.

9. Please provide clarification on circuit ID A.1. DC circuit is not illustrated on E5.1 as indicated in the circuit schedule.

A: For clarification of circuit A1, refer to Detail I, Sheet E4.5

10. Please provide stamped issued for construction drawing set for the Add- Alternate PV system design to include stringing, inverter mounting, grounding, interconnection, etc.

A: As noted in each Alternate description, contractor is responsible for and to provide all items for a fully operational system with the expanded subarrays as noted in each alternate. The Engineer will work with the contractor to verify specific details once final array size is determined based on awarded alternates.

11. What year version of the National Electrical Code must be followed for this project; the 2014, 2017 or the 2020 version?

A: The design shall conform to the 2020 version

12. Who is the Authority Having Jurisdiction (AHJ) over this property for code and permitting purposes?

A: This is a federal project therefore the Base Civil Engineer is the AHJ. However, the City of Alcoa provides and maintains the primary electrical system on base and will serve as the AHJ for that infrastructure. It is required per the contract documents, to follow all applicable and noted codes/criteria, there is no permitting or approval required.

13. Please provide the most current topographical survey of the potential solar array site.

A: See sheet C1.0

14. Please provide the most current underground utilities maps of the potential solar array site.

A: See sheet C1.0 for existing survey information and all utilities identified at the time of survey

15. Please provide the most current electrical systems maps of the potential solar array site.

A: See sheet C1.0 for existing survey information and all utilities identified at the time of survey

16. Please include a description and photographs of the physical equipment (if any) where the interconnection is to be connected at each of the potential solar array site.

A: Contractors may schedule a prebid site visit to open/inspect gear as part of the bid process. POC for site visits is Lt Col Jay Ferguson at (865) 336-4212.

17. Is there any requirement for ground cover in the ground solar array such as geotextile fabric & crushed rock or planting grass? If so, what are the specific requirements?

A: Yes. 94,500 sf of Creeping Thyme is the base bid. Thymus praecox as shown on sheet C2.0

18. Are there any restrictions to changing grade or elevation in the ground solar array area?

A: Grade changes are not currently shown or anticipated to be required. However, if the contractor desires to change grade and can show benefit to the construction process, betterment of the final installation of the Array, and so as not to impact usefulness or cause harm to surrounding grade or facilities, the contractor could make those changes. Any change would be based on final approval by and coordination with the government.

19. Please confirm the modules, DAS and inverter makes/models that expected to be provided by the contractor as of this time.

A: See specification section 26-3100

20. What area can be used for a material and equipment laydown to include the storage of containers and vehicles?

A: Contractor staging area is shown on sheet C2.0. Proposed laydown and storage areas are available adjacent to the work site area in both the Grass and asphalt areas as designated by the COR.

21. Is a job trailer allowed? If so, where could it be located? What are the procedures to connect power to a job trailer?

A: Job trailers are allowed and can be located within the work site area. Power is available in the general area but requires additional work to connect. Contractor is responsible for making electrical connection to existing base power if required.

22. Will water be provided on site? If so, where can we get water?

A: Water is available for filling tanks but not for service to office trailers. Sanitary sewer is not available.

23. Will spoils be allowed to be disposed of on-site?

A: Spoils may NOT be disposed of on‐site. Clean, debris free soil can be regraded into existing site.

Contractor must plan for cleaning/sweeping streets if used for transport, erosion control and seeding must be accomplished per the drawings.

24. Please provide the snow, wind, and seismic load requirements.

A: Arrays and their supports shall be designed to resist the loading requirements of ASCE 7-16.

- The PV Array shall be considered to be in Risk Category II.

- Design wind speed shall be 105 mph. Exposure C shall be assumed.

- Ground snow load shall be 10 psf. Snow importance factor shall be 1.0.

- Seismic accelerations shall be Ss=0.902 and S1=0.161. Seismic site class D shall be assumed. Seismic Importance factor shall be 1.0.

25. What location will be able to be used for?

a. Dumpster location

b. Lay down area

A: See sheet C2.0. Proposed laydown and storage areas are available adjacent to the work site area in both the Grass and asphalt areas as designated by the COR. It is up to the contractor to locate their proposed dumpster and laydown areas within the work site area and coordinate with the COR.

26. Please provide electrical details and interconnection details for any and all sources of backup and emergency power generation that will be connected to the same electrical grid as the proposed system, to include any site-wide systems. If there are no sources of backup or emergency power generation, please confirm that there are none.

A: Connection details to the existing emergency power generation system are provided on the Electrical drawings as part of the bid documents. Any available system wide drawings will be proved to the successful bidder.

27. The solicitation states electronic bids are not accepted. Please confirm what address the hardcopy bids are to be mailed to.

A: 123 Briscoe Drive Louisville, TN 37777

28. Based on the amended solicitation document, the system for the base bid is assumed to go from string 1-1 to string 12-4. However, based on sheets E2.0 and E2.1 in the drawing set, the size of the system that is indicated as the base bid includes strings 1-1 to 12-5. Which of these is correct?

A: Use sheet E2.1 for layout, sizing of the array and of the Alternate

29. In Option 1 in the solicitation it is stated that this Option includes strings 13‐4 to 17‐4. However, on page E2.1 of the drawing set, the strings for inverter 4 only go up to 16‐4. Was the inclusion of 17‐4 a typo or is the drawing set incorrect?

A: This was a typo and should be 13-4 to 16-4.

30. There are multiple discrepancies between sheets E2.0 and E2.1 in the drawing set:

a. E2.1 is missing 16 tables within the main array when compared to E2.0.

i. 1 table to the left of string 4-6 as shown on E2.1

ii. 1 table to the left of string 11-6 as shown on E2.1

iii. 1 table to the right of 3-8 as shown on E2.1

iv. 2 tables to the right of 8-8 as shown on E2.1

v. 3 tables to the right of 11-8 as shown on E2.1

vi. 5 tables below the row containing 9-8 to 11-8 as shown on E2.1

vii. 3 tables below the aforementioned 5 tables

b. Can you confirm which of these layouts is accurate?

A: Use sheet E2.1 for layout, sizing of the array and of the Alternate

31. We are not seeing any specific approved ground mount racking system in the project documents. Does this mean that we can use whatever ground mounting system that we want for the purpose of the bid?

A: The intention is to have driven piles for support of the ground mounted tables with loading to meet the requirements identified in previous Addendum.

32. Can you list the name, phone number and email address of the POC for this project at the City of Alcoa?

A: Alcoa Electric POC: Steve Reynolds, Senior Electric Engineer 865‐380‐4869 SReynolds@cityofalcoa‐tn.gov

33. Is the City of Alcoa expected to make the MV terminations in the transformer and MV SWGR?

A: Yes, Alcoa Electric will terminate all MV cable ends at transformer and switchgear.

34. Will the materials that the contractor needs to purchase from Alcoa be delivered by Alcoa or will the contractor be responsible for transportation of these materials to the site?

A: The GC will pick up the coffin vaults and half of the 4" electric conduit from Alcoa Electric's warehouse/yard. Just to clarify. The GC will purchase the coffin vaults from Alcoa Electric. Alcoa Electric is providing 3 of the 6 conduits for the duct bank (at no cost to the GC) for future loop closure. All 6 conduits will turn up in each vault (vault specs can be re‐issued if needed) The vaults are in stock, but we will have to order the conduit.

35. Sheet E6.0 Keynote #7 states that “CONDUCTORS TRANSITIONED BETWEEN ROWS TO DC

COMBINER WILL ADHERE TO ROW G OF THE DC SCHEDULE.” There is no Row G listed on the DC Wire Schedule on sheet E6.0. Can you clarify this?

A: This was a typo and should be A.1 not G

36. The DC wire and Conduit Specifications table on sheet E6.0 has a row titled “A.1”. This Row is not called out on the reference sheet E5.1. Can you clarify where row “A.1” is applicable?

A: Row A.1 is not shown but Keynote 7 clarifies the connection and details.

37. Section 26 0519 3.01 D states “PV Circuits: Copper. Solid for No. 10 AWG and smaller; stranded for 8 AWG and larger.” 2,000V rated PV wire is not manufactured with solid copper in any size; only stranded. Is stranded Cu 10 AWG 2kV PV wire acceptable? If not, do you want stranded Cu 8 AWG 2 kV PV wire used instead of

10 AWG?

A: Stranded Cu 10 AWG 2kV PV wire is acceptable.

38. Detail #2 on sheet E4.2 shows a 3” Sch 80 PVC conduit at the DC combiner for DC string wire. The DC wire and conduit specifications on sheet E6.0 call out a 1.25” conduit for this wire. Can you clarify which is correct?

A: Use 1.25” conduit for this wire.

39. Detail #2 on sheet E4.2 shows a 3” RMC conduit at the DC combiner for the conductors to the inverter. The

DC wire and conduit specifications on sheet E6.0 call out a 2.5” conduit for this wire. Also, Keynote #5 on sheet E6.0 states that Sch. 80 PVC is to be used for transitions from above grade to below grade. This conduit would be transitioning below grade so should this be Sch. 80 PVC rather than RMC?

A: Use 2.5” or 3” conduit is acceptable based on preference/availability. This conduit should be Sch. 80 PVC

40. Will the contractor be responsible for costs associated with the Special Inspection and Observations listed in

S.1? If so, can you provide the contact information for the geotechnical engineer of record as well as the structural engineer of record?

A: Yes. Geotechnical Services were provided by the following:

GEOServices, LLC 2561 Willow Point Way Knoxville, TN 37931 Phone (865) 539-8242 Fax (865) 539-8252

41. It is our understanding that the 480W Hanwha module that is the basis-of-design for this project is no longer manufactured in Georgia. Would the government still accept this modules use if it is manufactured outside of the US?

A: Government would not accept product manufactured outside of the US

42. Section 26-3100 states that Jinko Solar is an approved manufacture for this project. At this time, Jinko is only producing 405W modules in their facility based in Florida. Would the government approve the use of a 405W module for this project?

A: The government would accept the lower wattage panels if the requested DC wattage for the base bid and for each of the Options is met. It would be the responsibility of the contractor to redesign the layout and get approvals so as to accommodate the larger array.

43. If the government will approve the usage of a smaller wattage module for this installation should the contractor increase the total number of modules in their bid to match the overall DC wattage of the system as it is currently designed?

A: Yes, it is the intention to meet the requested DC wattage for the base bid and for each of the Options. It would be the responsibility of the contractor to redesign the layout and get approvals so as to accommodate the larger array.

44. Section 26-3100 lists monocrystalline as the only acceptable PV cell material. Would the government consider the use of thin film modules for this project?

A: No. the project specifications require monocrystalline

45. Section 4.1.1 Existing Fill Materials of the Geotechnical Report states “There is an inherent risk of excessive total or differential settlement of foundations and other features constructed on undocumented fill materials. At a minimum, we recommend that debris laden fill, deleterious materials, or very soft to soft materials encountered during grading or construction and/or between our borings, be completely undercut and disposed off‐site. A budget contingency for additional undercutting and replacement of unsuitable materials that may be encountered during construction should be included.” Is the intent to have the cost of undercutting fill materials and replacing with suitable fill included in this bid? We would usually defer to the structural engineering team for the racking manufacturer on this rather than including this cost in our bid.

A: It is not the intent to have to have any additional cost of "undercutting and replacing with suitable fill", included in the project bid. It is anticipated that the engineering team for the racking manufacturer has considered the current conditions to accommodate the intended pile installation. There is minor construction of the shallow footings area at the equipment pad, where unsuitable soil could impact the installation. This would be addressed as/if needed and covered by a change to the work.

46. Similar to above, do we need to include a budget for pile refusals during racking installation? We typically handle this via change order if needed after piles have been installed on the site to avoid unnecessary cost if all piles are able to be installed without refusal.

A: There is a possibility, per the Geotech report, of hitting obstructions during pile installation. If that should happen, we will handle the impacts of any pile refusals, at that time, and by reviewing available alternatives based on the location of the refusal. The documents do not request any additional budget/contingency be included as part of the bid.

47. Paragraph 52.211‐10 Commencement, Prosecution, and completion of work (APR 1984) , item (C)

"complete the entire work ready for use not later than three hundred sixty‐five days (365) after receipt of notice to proceed. The SF1442, item 11, states that: [work will be] "completed within 270 calendar days after receiving notice to proceed. The addendum No. 001 and NO. 002, SF1442, item

11. Indicates 270 days duration to complete. Please confirm that the duration is 365 days to complete, after the notice to proceed.

A: Contract duration is 270 days from NTP.

48. For the MV conduit purchased by Alcoa. The run is shown as approximately ¾ of a mile. We need to know how long the conduit provided by Alcoa is to be? 10ft, 20ft?

A: 10 Ft

49. Sheet C1.0 does not show the solar field being enclosed by a fence. Please confirm that this is not required by the Authority Having Jurisdiction

A: See Response to #60.

50. Please provide pictures of the interior of the existing electrical panels that the system will tie into.

A: Contractors may schedule a prebid site visit to open/inspect gear as part of the bid process. POC for site visits is Lt Col Jay Ferguson at (865) 336-4212.

51. Can you confirm that the installation of a security fence surrounding this PV array is not included in this project?

A: See Response to #60.

52. Can you confirm that the procurement and installation of Inverters 5‐8 are not to be included in the base bid?

A: This is correct, the only inverters included in the base bid are those required for the Base Bid sub Arrays.

53. Sheet E5.2 shows a Power Manager System Control. Is this intended to be included in this package or is this already existing on the site?

A: This is part of the existing Standby Generator back up system.

54. Is this project exempt from sales tax?

A: No

55. The legend on sheet E5.2 calls out multi‐mode fiber running from the PV Switchgear to the

Microgrid Panel. It appears that the wire schedule on sheet E6.0 is calling for single mode fiber here according to the reference sheet column for Row “O”. Can you clarify this?

A: Single Mode Fiber is intended per wire schedule.

56. Considering the current supply chain uncertainties, how long does our price need to be fixed? We see that the government is asking for pricing to be held for 90 days on the SF 1442.

A: 90 days

57. Does the government want us to include a contingency to account for future price fluctuation in our bid, or how should this be handled if the award is made after 90 days?

A: The Government can’t tell you how to submit your pricing. This is a Firm Fixed Price Contract

58. If the project moves to a higher wattage module, will the clearing/grading requirements for the site change?

A: Yes, the appropriate area shall be cleared and graded to accommodate the final accepted array size, this applies to Base bid alternative wattage panels, and/or Bid Alternate array size.

59. Please confirm the current specification concerning the inverter and modules. The current market has evolved from the equipment mentioned in the drawings, please confirm alternative products are allowed and who is responsible for the reengineering fees associated with switching products.

A: Alternative projects/models are acceptable assuming compliance with all performance and production requirements outlined in the specifications. It will be the responsibility of the provider for any reengineering.

60. No fence is currently called out in the plans, yet the NEC 2017 code calls for all ground‐mounted arrays to require a fence surrounding the perimeter of the array. Is a fence required here, and what is the current fence specification?

A: Per NEC 2017, fencing is required for large‐scale PV electric production facility of no less than 5000 kW, reference Article 691.4 (2). The current design is less than 5000 KW.

61. Please clarify the future expansion comment on drawing E2.2 Inverter/Transformer station details.

Is this inclusive of all alternate bids only or future expansion beyond this?

A: Provide Stub ups, capped 12” above slab and 12” beyond slab edge, for all potential Inverters for full build out of 150kW (AC) Array.

62. In Note 9, regarding the 3,000' run and tap box that Alcoa is providing, please confirm if the cables and conduits being provided is between PV12 and the MV transformer or PV12 and the array.

A: The cables and conduits being provided are between MV switchgear and solar PV transformer (2000kVA pad mount transformer)

63. On drawings 3.0, are SF lines drawn through THE array of all Straw Wattle, and if so, will there be a perimeter Silt Fence? Please provide clarity on what labels are Straw Wattle and which are Silt Fence.

A: The silt fence and straw wattle are interchangeable. Please use whichever is best suitable for the site and ease of installation.

64. Can the site superintendent also serve as the project's quality control manager and site safety?

A: Based on the type/size of the project, this is acceptable.

65. Please confirm water tower foundation does not conflict with proposed routing of medium voltage electrical trench.

A: Confirmed. GC is advised that every ground disturbance must have a dig permit to ensure infrastructure is marked and avoided.

66. Please confirm electrical coffin vaults are provided by others.

A: Vaults are purchased from and provided by the City of Alcoa.

67. Can the government please clarify the Period of Performance: the SF 1442 States 270 days but the

RFP and Pre‐Bid Slides reference 365 days?

A: 270 days

68. Is there a person that a mailed bid should reference and that bidder can confirm receipt? Or will this be emailed directly to bidder upon notifying Contract Specialist that bid is being mailed, per Pre‐Bid Slides?

A: Bids can be mailed to:

134th Contracting Office MSgt Lisa Fingland 123 Briscoe Drive Louisville, TN 37777

There is not a way to confirm receipt prior to bid opening unless you put your email on the outside of the envelope with a request for notification.

(End of Summary of Changes)