NNM17615413E_Questions_and_Answers_1_thru_49.pdf

NNM17615413E Question and Answers 1-49

1. Spec Section 019113 – General Commissioning Requirements; Section 1.1 A. last sentence says

Commissioning services will be provided by NASA. Section 1.7 D.2 says for the GC to include the cost of commissioning in the total contract price. Can you clarify?

1A. Bid per Plans and Specs. NASA will provide the commissioning agent. However, the contractor is responsible for providing the commissioning agent information required.

2. Per the IFB “Helpful Information about Submitting Your Bid”, the list contains the A. SF1442; B. Bid

Schedule; C. Section K; D. Bid Bond; and E. EMR. Also, Section J, J.1 List of Attachments instructs that the

SHE Plan and Quality Assurance Plan are to be “incorporated into the contract upon approval – prior to

Notice to Proceed”. However, the Attachment J-3 and Attachment J-4 instruct us to submit these 2 Plans as part of our proposal. Would you please clarify whether these 2 Plans are to be submitted as part of our proposal, or are they to be submitted after an award is given and prior to the Notice to Proceed?

2A. See amendment 3 to the solicitation.

3. Several of the buildings note the presence of Asbestos Containing Materials and/or Lead Based Paint, and that the contractor is required to remediate all ACM and LBP prior to demolition. Please provide an

Asbestos and Lead Survey for the buildings.

3A. See attached 2009 Asbestos surveys and 2015 survey updates.

4. Several of the buildings note the requirement to re-work the fire sprinkler heads, and add additional fire sprinkler heads in the mechanical rooms. Please provide as-built drawings for the Buildings in this project.

4A. Building as-builts are not available. Bid per Plans and Specs.

5. Several of the buildings require roof penetrations through existing roofs. Detail 3/A0 for Building

4207 notes “Prefabricated pipe boot adhered to roofing as required by roofing manufacturer”. Please provide manufacturer information for the existing roof on building 4207. Will the contractor be required to verify roof warranty compliance for all building roof modifications? If so, please provide manufacturer information for all buildings requiring roof penetrations.

5A. All roof warranties are expired where gas burner vent roof penetrations are required.

6. Is the Natural Gas System on Marshall Space Flight Center a private system of a public system? Will the service meters and regulators be provided by the utility company, or is the contractor required to provide them?

6A. The system is private and the contractor will be required to provide gas meters and regulators.

7. In the Invitation For Bids, Note 2 states that all questions are to be submitted no later than fifteen

(15) calendar days prior to the scheduled bid opening which is before the scheduled site visit. Can this requirement be changed in case questions arise during the site visit?

7A. See amendment 4 to the solicitation.

8. Is the underground Natural Gas branch piping to the buildings in Additive Alternates 1 & 2 to be in the Base Bid or included in the Additive Alternates?

8A. All underground gas piping is to be included in the BASE BID.

9. At Building 4487, the Civil drawings show the underground Natural Gas piping being run to only one mechanical room (B001). The Mechanical drawings show the underground Natural Gas piping run to four (4) additional mechanical rooms. Please clarify.

9A. See Revised Drawings FAC-NG-CF-C7, FAC-NG-CF-C19, FAC-LA-4487-C1 and specification SECTION

335115.

10. Will the tie-ins of the new Natural Gas piping to the existing mains need to be hot-tapped or will scheduled outages be allowed?

10A. See Revised specification SECTION 335115.

11. I could not find asbestos or lead surveys in the specifications or solicitation. Are surveys available for the buildings in this solicitation?

11A. See attached 2009 Asbestos surveys and 2015 survey updates.

12. Please provide the “Army and NASA Site Access Control Boundaries” map showing areas at MSFC which have the potential to contain UXO/CWM.

12A. See attached map.

13. Regarding hot water heating piping, aboveground, NPS 2 and smaller, paragraph 232113-3.1-A-2 refers to “Type 96 steel pipe”. What standard or reference is this from? Also, are 150# Malleable Iron fittings acceptable for this service?

13A. See revised SECTION 232113 HYDRONIC PIPING.

14. In the HVAC Piping Insulation specification, paragraph 3.2-B-1 calls for an epoxy coating of the carbon steel pipe prior to insulating. Please provide a specification for the epoxy coating.

14A. See revised specification SECTION 230719 HVAC PIPING INSULATION.

15. On the boiler schedule for each building, there are columns shown as “Output Rating” and “Output

Required”. Because boilers from different manufacturers operate at different efficiencies, this translates into different output ratings. Do we use “Output Required” to select the boiler model to meet the actual requirement of the system or “Output Rating”? If “Output Rating” or “Input Rating” is the requirement, then please clarify the following. Buildings 4200 and 4663 have boilers scheduled with input ratings of 3,500 MBH each. Some manufacturers have different model size/input rating increments that vary from this. Please verify that we can use (1) 4,000 MBH and (1) 3,000 MBH in lieu of two of equal size. Since the boilers will be modulated/alternated by its own control, it should not change system performance.

15A. Yes, Output Required is the minimum BTU/hr required by the boiler to satisfy the load. Output rating is just a reference for the operation range of the boiler. The input size is the gas input required to maintain boiler operation. The contractor shall use the output required and shall select the boilers that will operate to satisfy that required value at a minimum.

A larger input size can be selected if the manufacturer does not have the prescribed 3500 as noted as an example. The main factor will be the output requirement, and the boiler selected must meet this value.

The boilers shall match capacity sizes, do not select boilers with 2 different capacities.

16. Buildings 4207, 4487, 4650, 4663 and 4707 have boilers scheduled that require the ability to fire on both Natural Gas and LP. Building 4487 also requires that the dual-fuel units have controls for automatic changeover of the fuel. The basis-of-design equipment has provisions for dual-fuel connections for some of the sizes scheduled but does not offer automatic changeover. Most manufacturers including the smaller basis-of-design sizes (less than 700 MBH) offer boilers that can be fired on either fuel source. They do require an orifice change to make this happen. LP is not included in this scope of work as a permanent fuel source. Would a boiler that can fire on either fuel with minimal changes be considered?

16A. Yes. See revised drawing FAC-LA-4487-M1. Note, that the building 4487 is noted as the only building which has a scheduled Automatic Changeover notation. This has been revised on the schedule.

17. The boilers for Buildings 4200, 4487, 4610, 4463 and 4707 are scheduled to require 120/1/60 power. On sizes over 2,500 MBH, most boiler manufacturers increase to 3-phase power that will use the least amount of energy to power the controls and internal combustion fan on these larger sizes. The building mechanical rooms that house the new boilers have 3-phase power available. Can the new boilers be 3-phase (208/3/60 or 460/3/60)?

17A. If an “as equal” manufacturer has different power requirements than the basis of design, it will be the responsibility of the contractor to coordinate with the affected trades at no cost to the government.

18. Building 4203 shows removing heat and hot water pumps and steam supply. The drawings show that the steam needs to be capped. It also showing removing three (3) pumps. There is not another drawing showing the replacement of these pumps or hot water to resupply this building. We need a drawing showing the replacement of the pumps and piping.

18A. Remove drawings FAC-BY-4203-A0, FAC-BY-4203-ED1, FAC-BY-4203-MD1, FAC-BY-4203-UCS1, FAC-

BY-4203-UCS2 from the contract documents.

19. All buildings – there is no detail for the boiler stacks through the roof. Please provide a detail.

19A. Added a stack and a penetration detail as well as a sidewall detail to drawings for 4650 and 4765.

See revised drawings.

20. All buildings – what type of roof is on all buildings?

20A. 4207 – Flat Modified Bitumen

4249 – Standing Seam Metal Roof

4250 – Standing Seam Metal Roof

4759 – Metal Roof

4760 – Standing Seam Metal Roof

21. What is the incoming gas pressure from the gas mains to the building?

21A. 45-55psig is the normal operating pressure of the gas mains. See revised spec 335115 section

3.10.B

22. Are the gas meters and regulators to be installed on the exterior of the building? Will the gas meters have remote readout capability? What type (brand) gas meters are normally used by DPW? Will the control contractor be required to read the gas meter usage?

22A. See Plans and Specifications.

23. Are both control valves on the condensing boilers provided by the control contractor?

23A. It is the Prime Contractor’s responsibility to coordinate purchase responsibilities between trades.

24. We see that the normal working hours are 7am – 5pm. Will the contractor be allowed to work additional hours due to outage times to get the system back online?

24A. See Specification Section 01 05 90.

25. Is the CCL of $1,000,000 to $5,000,000 correct? This seems inaccurate based on the amount of work that is being called for.

25A. See amendment 4 to the solicitation.

26. Drawings P-1 Bldg 4765 and 4765A Plumbing Floor Plan: Do the floor drains and trench drains require and P traps or trap primers? Please provide specifications and a schedule for the wall hydrants, trench drains, floor cleanouts, and floor drains.

26A. Trap primers are required for the floor drains, not for the trench drain. A schedule has been added that includes wall hydrants, trench drains, floor cleanouts, and floor drains. Specifications are also included with the schedule. See revised drawing 4765 P1.

27. Drawing P-1 – Please provide a detail showing the backflow preventer.

27A. A detail for the backflow preventer has been added, see revised drawing 4765 P1.

28. The boilers will have boiler stacks that will penetrate the roof of each building. Please provide us with the type roof system and if it is under warranty please provide the name of the insurer.

28A. All roof warranties are expired where gas burner vent roof penetrations are required.

29. The exterior natural gas lines – will boring be allowed and/or open ditch cuts? Which one is required?

29A. The contractor shall determine the appropriate means of installation based upon site conditions. Directional boring and open cutting are both acceptable methods of installation. Directional boring is preferred where feasible in order to minimize ground disturbance and disruption to vehicle traffic and facility functions.

30. It does not call for new housekeeping pads – will new housekeeping pads be required?

30A. Housekeeping pads are required for base mounted equipment. 4” minimum thickness and extending at least 4” beyond equipment. 3000 psi Concrete, reinforced with two layers of steel mesh, chamfered edges

31. Regarding Building 4200, the Electric Steam Humidifier Schedule states the humidifier to be an electrode type and specification 238414, paragraph 1.5-A.1 states to supply one replacement cylinder with each self-contained humidifier. Paragraph 2.1-H states the heating elements shall be constructed of incoloy sheathed cartridge type resistance heating elements. Please clarify which type humidifier is required.

31A. Provide humidifiers per 238414 paragraph 2.1.

32. Regarding the Heating Coil Schedule for Building 4200, Hot Water Coils 4200-COIL0014, 0015, 0016

& 0018 water side and air side capacities do not match.

Example: COIL0014 Water Side BTU = 500 x GPM x DT

= 500 x 21.3 x (140-100) = 426,000

COIL0014 Air Side BTU = 1.085 x CFM x DT

= 1.085 x 15,100 x (125-50) = 1,228,763

Please clarify which BTU requirement is required.

32A. Drawings have been revised, the coil airside information is correct. We have revised boiler, coil, and pump requirements and have changed sizes on the drawing accordingly. See the revised drawings in set 4200.

33. Regarding the Air Coils specification 238214, paragraph 2.1-I states the frames are to be galvanized-steel channel. Paragraph 2.1-J indicates the frames are to be stainless steel in corrosive areas. Please clarify which coils are in corrosive areas.

33A. Coils in building 4760 are in a corrosive environment.

34. Regarding the Air Coils specification 238214, paragraph 2.1-L.7 states the coils are to have a baked phenolic coating. Please verify if this is required for all coils.

34A. The specification 23814 Air coils has been revised to state that no phenolic coating is required.

See attached specification.

35. Regarding the Natural Gas / Liquid Petroleum Gas Distribution specification 335115, paragraph 3.10-

B states the normal operating pressure for the system is 50 psi. Are we to assume this is the operating pressure of the future Liquid Petroleum service also?

35A. TBD.

36. Test and Balance – Could you provide details for the Diffusers, VAVs, Exhaust fans & RTUs so TAB can estimate the project?

36A. Bid per the equipment shown on the drawings and the specifications.

37. Test and Balance – Do the TAB technicians have to be NEBB-Certified?

37A. Bid per Test and Balance Specification 230593

38. Test and Balance – What is the required tolerance for TAB?

38A. Bid per Test and Balance Specification 230593

39. Test and Balance – Is a water balance required?

39A. Yes. Bid per Test and Balance Specification 230593.

40. Test and Balance – Do the building requiring TAB need to be balanced at one time, or can they be done as each building is completed?

40A. It is the Prime Contractor’s responsibility to coordinate all work efforts with the user and other trades.

41. General Conditions – Is there a Liquidated Damages amount given for this project?

41A. No.

42. The specifications require 1 ½” exterior HDPE gas piping. The smallest size made is 2”. Therefore 2” will be installed.

42A. TBD

43. The interior gas piping indicates that the gas meter is on the inside of the building. The meter and regulator should be installed on the exterior of the building where the gas stub up is shown. Please verify this location.

43A. Regulators are outside the buildings. Meters shall be inside the building. See Spec 231123

44. Does the gas meter require a pulse meter? If so, what type?

44A. See Spec 231123

45. Does the gas meter require a modem for Dorsett’s to read gas usage?

45A. See UCS drawings. Bid per plans and specs.

46. Please provide a C1 drawing for Building 4650.

46A. See new sheet FAC-BO-4650-C1

47. On Drawing M5 – Building 4650, the drawing indicates that there are five (5) 3” floor drains, but the isometric drawing only shows four (4). Please clarify.

47A. Provide 4. See attached drawings.

48. There is not a temporary lay down yard location shown on drawings. Please indicate where this will be located.

48A. Lay down area will be identified after bids.

49. At the request of the mechanical subcontractors can the project due date be extended 7 days to allow the mechanical subcontractors to properly take off and price this project since it is such a large project?

49A. No.