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MPA Project No. L1359-C1 HVAC SYSTEM REPLACEMENT

SOUTH CARGO BUILDING 57 LOGAN INTERNATIONAL AIRPORT EAST BOSTON, MASSACHUSETTS

RESPONSES TO QUESTIONS

and/or RFI’s

July 14, 2017 The attention of Contractors submitting General Bids and or Filed Sub-Bids for the above referenced project is called to the following Responses to Questions and/or RFI’s. Responses to Questions and/or RFI’s: Question from Jeff Rosen at J.F. White dated 06/23/2017

Item #1

Summary of Question: The title for electronic file appears as “L1359C01-Specification w 4 11x17's”. Should there be 11x17 sheets attached to the document? If so, please provide.

Design Team Response: The file was so titled to alert the end user that there are 11x17 sized pages in the document.

Questions from Michael Creamer at Cam H.V.A.C. and Construction Inc. dated 06/29/2017

Item #2

Summary of Question: In section IIB-37 Item 42 Hoisting Equipment and Machinery calls for the General Contractor to provide for the subcontractors use. However, in section 230001-19 item 1.17 calls for the mechanical contractor to furnish. Please clarify as to who provides it.

Design Team Response: GC is responsible for all hoisting to and from the roof. Trade contractors are responsible for lifting/rigging within the building.

Item #3

Summary of Question: Section 230001-19 item 1.16 calls for BIM modeling per section 01329 BIM Coordination. This section does not exist in the specifications. Do we provide the

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BIM modeling?

Design Team Response: No, a BIM model has been developed for the project and is available to the contractor. However, BIM modeling is not required to be performed by the Contractor. See Addendum No. 1 for change to specification section.

Item #4

Summary of Question: Section IIB-4 Item 47.1 Cutting and Patching calls for the General Contractor to provide all cutting, chasing, grouting, drilling and patching. However, in section 230001-19 item 1.18 it calls for the mechanical contractor to provide. Please clarify who performs it.

Design Team Response: Trade contractors are responsible for their own cutting and patching necessary to complete their scope of work. The GC is responsible for cutting and patching shown on architectural and structural drawings.

Item #5

Summary of Question: Who is physically responsible for the removal of the existing exhaust fans, condensing units, and hoods on the roof?

Design Team Response: The GC is responsible for crane and all lifting to and from the roof. The mechanical contractor is responsible for disconnection and demolition of mechanical equipment as shown on the contract documents.

Item #6

Summary of Question: Will a fire watch be required for all brazing and soldering of the refrigeration and hot water piping? If yes, what is the hourly rate?

Design Team Response: Yes, a fire watch is required. MASSPORT will provide a rate.

Item #7

Summary of Question: What is the completion date of the project?

Design Team Response: See Division IIB.

Item #8

Summary of Question: It is assumed that the existing heating system is glycol and water based. So in order to connect the new piping branch’s and runs to the existing piping, the system will need to be drained down until completed. How will the general contractor utilize the existing heating system for temporary heat?

Design Team Response: The existing system does not contain glycol. It is expected that the contractor will make piping connections to the existing system during a time of the year when temporary heating is not necessary.

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Item #9

Summary of Question: Do I re-inject the existing glycol/water after completion of the project?

Design Team Response: Existing fluid from the system shall not be reinjected. The mechanical contractor shall be provide new glycol when refilling the system.

Item #10

Summary of Question: What is the estimated total gallons of glycol and water in the existing piping system?

Design Team Response: All piping is shown on the drawings so this can be calculated by the contractor.

Item #11

Summary of Question: There is no specification for piping flush out and cleaning. Do we provide it?

Design Team Response: Piping flush out and cleaning shall be provided. Refer to Specification Section 230001.2.16 Chemical Treatment – Water Systems.

Item #12

Summary of Question: Section 230001-146 item G temporary heating- please clarify item 3. Do I need to provide a full time boiler engineer prior to Massport acceptance if the existing heating system is used for the temporary heat?

Design Team Response: No. Item specifies only that attendance is required to ensure that heating system is in operation when necessary.

Item #13

Summary of Question: Will the entire ceiling system grid, tee bars, and tile be removed for the installation of the duct work and piping?

Design Team Response: Yes.

Item #14

Summary of Question: Will the furniture in the office spaces be removed?

Design Team Response: Office furniture is to remain within the office spaces and be protected during construction. A schedule of existing furniture has been provided on Drawing A-004 should the GC/MC determine it to be in their best interest to temporarily move furniture. All existing furniture shall be placed in its original location at project completion.

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Item #15

Summary of Question: Are we to attach the new paddle fans to the bottoms of the existing trusses? There is no detail indicating what to attach the fans to.

Design Team Response: New paddle fans shall be mounted to angle-irons spanning between existing roof trusses. Angle irons shall be provided and installed by Division 05. Fans shall be mounted to the angle irons by the M.C. per manufacturer instructions. Refer to Addendum No. 1 for updates.

Item #16

Summary of Question: Section 230001-34 item 2.2 acoustic duct lining calls for hospital grade liner as indicated on the drawings. None is shown on the drawings.

Design Team Response: Duct lining has been added to the return main. See drawing M-222E re-issued under Addendum #1.

Question from Tony Ciuffo at RL Stone dated 7/3/2017

Item #17

Summary of Question: Section 230001-65 item 2.19 Custom Air Handling Units indicates 3 equipment manufacturers. Please indicate if this project is restricted to these 3 manufacturer’s or is equivalent products acceptable.

Design Team Response: Approved equals are acceptable as defined in Division IIB of the specifications. All substitutions must be approved by the Engineer/Architect during the submittal process.

Questions from Allen Capone at BC Construction Co. Inc. dated 7/5/2017

Item #18

Summary of Question: By any chance will you be scheduling another site Review?

Design Team Response: There will be no other site review. The site review was to show prospective bidders the roller deck and the area where the temporary offices will be located. Photos are included at the end of this document.

Questions from Frank DiDonato at NB Kenney dated 7/5/2017

Item #19

Summary of Question: Please confirm that the extent of HVAC demolition is to cut, cap, make safe, and lower to floor or ground, for removal and off site disposal by the general contractor.

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Design Team Response: Yes. See Specification section 024100 1.2 B 4.

Item #20

Summary of Question: Please confirm who is responsible for furnishing and installing DDC controls for the AHU’s and associated ACCU’s. The equipment schedule calls for DDC controls to be factory provided and Section 230001-82, 2.19, M, 1, of the specifications calls for DDC controls to be provided by the ATC contractor.

Design Team Response: Controls for AHUs and ACCUs shall be provided by the factory and shall be BACnet native. ATC contractor shall be responsible for connecting these controls to the BMS. Controls for the H&V units shall be provided by the ATC contractor. See Addendum No. 1 for change to specification section.

Item #21

Summary of Question: Please confirm if the VFD’s for the AHU’s are to be remotely mounted outside the unit to an adjacent wall.

Design Team Response: VFD’s for the AHU’s shall be mounted on the exterior surface of the units. Approximate locations of VFD’s are shown on unit plan view drawings on M-600.

Item #22

Summary of Question: Mechanical Drawing M-800, equipment schedule, indicates that the VFD’s for the H&V units are to be mounted outside the unit. Secion 230001-89 2.20 7a indicates that the VFD’s are to be factory mounted. Please confirm if the VFD’s are to be mounted remotely to an adjacent wall outside the units or factory mounted within the units.

Design Team Response: VFD’s for the AHU’s shall be mounted on the exterior surface of the units. Approximate locations of VFD’s are shown on unit plan view drawings on M-600.

Item #23

Summary of Question: Who is responsible for temporarily covering the existing openings where the gravity relief hoods are being removed.

Design Team Response: Opening protection to be provided by G.C. See A-000 note #4 under “General Demolition Notes”.

Item #24

Summary of Question: Who is responsible for the removal of existing and installation of the new destratification fans, CF-1 to CF-6?

Design Team Response: The M.C. shall be responsible for both demolition of the existing paddle fans and purchase and installation of new destratification fans CF-1 to CF-6.

Item #25

Summary of Question: Are we to assume the work hours for the mechanical room in the lower level will be the same as shown on A-003, Monday-Friday 9:00AM to 5:00PM?

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Design Team Response: There is no mechanical room on the first floor of the building. The lower level of the mechanical room is at the mezzanine level shown on A-004. Work hours for both the upper and lower level of the mechanical room are indicated by key note 1 on drawing A-004 (Monday-Saturday 9:00AM – 5:00 PM).

Item #26

Summary of Question: Please provide the work hours for the Upper Level and Roof Level areas.

Design Team Response: Work hours for all upper level locations are shown on A-004. There are no work hour limitations for the roof level but work on the roof effecting equipment operation on other levels must be coordinated properly.

Question from Steve Wirtes at Northern Contracting Corp dated 7/10/2017

Item #27

Summary of Question: Will another walkthrough be scheduled?

Design Team Response: There will be no other site review. The site review was to show prospective bidders the roller deck and the area where the temporary offices will be located. Photos are included at the end of this document.

Question from Dan Chisolm at Schneider Electric dated 7/10/17

Item #28

Summary of Question: Please refer to Specification 230001 – 119 2.31.B.1. This section lists acceptable manufacturers for Automatic Temperature Controls. Please confirm Schneider Electric as an acceptable manufacture as they are currently a controls provider for Massport.

Design Team Response: Refer to Addendum No. 1 for changes to this specification section paragraph and also changes to Specification Section 230900.

Question from Julie Power at MEC Power Group dated 7/10/2017

Item #29

Summary of Question: It is stated in Spec Section 260001 that Filed Sub Contractors are to include the cost of payment and performance bonds in their bid price. It is our understanding that the general contractor would cover the cost of these bonds. Please advise.

Design Team Response: We believe this question refers to the paragraphs on page 1 below

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the title and before the table of contents. These paragraphs have been deleted by Addendum No. 1.

Item #30

Summary of Question: It is stated in Spec Section 260001 that bids will only be accepted from Filed Sub Contractors pre-qualified by the Awarding Authority. Please confirm that there is no prequalification required to submit a bid.

Design Team Response: We believe this question refers to the paragraphs on page 1 below the title and before the table of contents. These paragraphs have been deleted by Addendum No. 1.

Item #31

Summary of Question: Within the Division 27 specifications, there are several references to Air Blown Fiber and, specifically, the Sumitomo ABF product; however, there appears to be no air-blown fiber optic work shown on the plans. Please confirm that there is no blown-in fiber work included in this project. If the intent is to include blown-in fiber work in the future, then Sumitomo is inappropriately referenced in the specs as a proprietary product for this application.

Design Team Response: It should be noted that Section 255000 requires providing (furnishing and installing) cabling meeting the requirements of Division 27. As such there are sections in Division 27 which were left in place for direction to Section 255000.

Item #32

Summary of Question: There are several instances in the Division 27 specs where additional information is requested to be submitted with the bid proposal. It has been our experience that this type of information cannot be requested at bid time. Specifically:

• Spec Section 270000, sub-section 1.06(A): Detailed Bill of Material • Spec Section 270100, sub-section 1.06(A) System Certification • Spec Section 271000, sub-section 1.06(D): Installer certificates • Spec Section 271000, sub-section 1.07(E): Information for proposed "approved equal"

products

Design Team Response: These requirements have been deleted by Addendum No. 1.

Questions from Jay O’Toole at Greenwood Industries dated 7/10/2017

Item #33

Summary of Question: Please refer to Page 075416-1 Paragraph 1.2/B. Please confirm that the roofer is not responsible for installing any roof drains on this project.

Design Team Response: There are no roof drains included in this project. See Addenda #1 for changes to the specifications.

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Item #34

Summary of Question: Does the roofer own any wood blocking? Section 070002 does not include wood, which is part of 061000. Additionally, Page 075416-2 Paragraph 1.2/C specifically excludes wood from the roofer’s scope. However, Page 075416-3 Paragraph 1.3/B/11 assigns wood blocking to the roofer. Could this be clarified, please?

Design Team Response: The roofing contractor is responsible to purchase and install wood blocking associated with roofing work. Please refer to Section 061000 for blocking requirements.

Item #35

Summary of Question: Who is the manufacturer of the existing roofing system?

Design Team Response: The existing roofing system is manufactured by FiberTite by Seaman Corp.

Item #36

Summary of Question: Could the vapor barrier spec be clarified? Page 075416-16 Paragraph 2.7 specifies both 6 mil poly, which is a loose-laid product, and a self-adhered modified bitumen product, which is completely different. Which is correct?

Design Team Response: The existing vapor barrier should be matched in kind. If it is 6 mil poly, then that is what should be used. If it is the self-adhered product, then the roof should use this product to match the existing. Refer to Addendum No. 1.

Questions from Michael Field at Wayne J. Griffin Electric, Inc. dated 7/10/2017

Item #37

Summary of Question: Please confirm we are correct in our understanding that work and materials described in non-electrical specifications or shown on non-electrical drawings, without also being described in the electrical specifications, is for coordination purposes only and shall not be part of the electrical contractor's bid for this project.

Design Team Response: The Electrical Contractor owns the work indicated on the electrical drawings and the work indicated in the Electrical specifications or referenced in the Electrical sections as being included.

Question from Dan Chisholm at Schneider Electric dated 07/12/17

Item #38

Summary of Question: Note 1 on drawings M-001 – M-122E pertains to demolition of pneumatic control components to be removed and all tubing to be capped at the main. Which division will be responsible for this demolition work?

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Design Team Response: This work shall be the responsibility of Division 23.

Questions from Henrik Pedersen at EDM Construction dated 07/13/17

Item #39

Summary of Question: Are the new C8 channels for the louvers (see drawing A-601) included under the FSB for section 050001 or are these provided by section 089000?

Design Team Response: They are to be included under FSB 050001.

Item #40

Summary of Question: Detail C on S-003 shows the typical joist stiffeners. Under notes it states “refer to general notes K1 to K4 for additional requirements”. We have not be able to find these notes. Please provide general notes K1 to K4.

Design Team Response: Disregard this note 2.

Item #41

Summary of Question: Please provide plan view S-drawing showing location(s) for the required joist stiffeners (detail C/S-003)

Design Team Response: We expect all point loads to be within 6" of either the top or bottom web member chord panel point. Therefore, no stiffener is required.

Questions from John W. Egan, Jr at John W. Egan Co. Inc dated 07/13/17

Item #42

Summary of Question: Drawing A-600 Finish Schedule & Interior Details, General Finish Schedule Notes #4: Is it your intent under Spec Section 090007 to paint a12 inch band on the drywall partition, for the entire circumference of the rooms in which the ceilings are being replaced.

Design Team Response: Yes

Item #43

Summary of Question: Drawing A-600 Finish Schedule & Interior Details, General Finish Schedule Note #5: Is it your intent under Spec. Section 090007 to paint a 12inch band on the CMU partition, for the entire circumference of the rooms in which the ceilings are being replaced.

Design Team Response: Yes

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Question from Jennifer Wrightson at Rockwell Roofing, Inc. dated 07/14/17

Item #44

Summary of Question: Specification Section 075416 Ketone Ethylene Ester Roofing Section 1.11 A. calls for a 15 year warranty. Where the roofing is existing the best that could be offered is that the existing warranty would be upheld.

Design Team Response: The roof was installed in 2014. It is expected that the work of this contract will be such that the existing warranty is maintained.

- End of Responses-

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Photos of Existing Roller Deck from Site Walkthrough dated 6/29/2017

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Photos of area where temporary office will be located from Site Walkthrough dated 6/29/2017