RFP SC-24-622 Addendum 2 with all attachments dated 02-07-2024.pdf

Ames Laboratory RFP SC-24-622 ADDENDUM NUMBER 2

ADDENDUM NUMBER 2

ADDENDUM DATE: 2/7/2024

PROJECT: RFP SC-24-622 Wilhelm Hall HVAC Upgrades

PROPOSAL DUE DATE: 2/14/2024 at 4:00 p.m. CST

ADDENDUM ISSUED DATE: 2/7/2024

The information contained in this Addendum modifies, supplements, or replaces information contained in the Bidding Documents dated 1/10/2024 and is hereby made a part of the Contract Documents.

Acknowledge receipt of this Addendum with your proposal submission

Addendum consists of 5 pages and 5 pages of attachments.

ADDENDUM INDEX

GENERAL ITEMS: Items 1 - 7.

APPLICABLE TO THE PROJECT SPECIFICATIONS: Items 8 - 14.

APPLICABLE TO THE DRAWINGS: Items 15 - 18.

ADDITIONAL ACCEPTABLE PRODUCTS AND SYSTEMS Items 19 - 24.

ATTACHMENTS:

Specifications:

Section 23 05 48 – Vibration Controls for HVAC 2 pages.

Drawing Sheets:

S-104E – Level 4/Roof Framing Plan – East 1 page.

Pre-proposal Meeting Sign in sheets 2 pages.

GENERAL ITEMS

1. Question #1: Is only the Return Air Ductwork to be pre-insulated or is a small section needed for the supply to stub into the building and back into the vestibule?

1.1. Only ductwork exterior to the building is pre-insulated. All ductwork in the penthouse will be enclosed in the penthouse.

2. Question #2: Will pipe and fittings in central shaft be installed and furnished by owner.

2.1. Per G-004, hatch pattern indicates areas of owner furnished and installed scope of work.

3. Question #3: Can you provide a copy of the attendance list from the meeting last Friday? (Pre-Proposal Meeting on 01/19/2024)

3.1. Yes. Attached.

4. Question #4: Can you provide the presentation document that was used if possible? (At the Pre- Proposal Meeting on 01/19/2024)

4.1. The presentation document used during the Pre-Proposal Meeting was the actual RFP document which can be accessed in Cybox/Box.

5. Question #5: A list of expected durations or rate of work for the work being completed by Ames lab, as discussed at the meeting, to use in creating a proposed schedule.

5.1. Ames Lab Construction Manager will provide a higher level of detail to the contractor at first pre-con meeting. For now, when preliminarily scheduling, assume that the Ames Laboratory scope of work will be on the critical path for 1.5 months. Most of the Ames Lab tasks should be laid out by the contractor ahead of time, so they do not affect the critical path.

6. Question #6: Will Ames Laboratory (owner) supply all the materials and installation for the chilled water and heating water piping in the shaft and leaving stub outs for the mechanical contractor to tie on to?

6.1. Yes. The contractor will install from where it exits the shaft. The contractor’s superintendent will have to assist the lab maintenance staff with the planning and layout of these activities. The contractor’s superintendent will have to direct the lab’s foreman/crew leader for proper coordination and tie-ins

7. Question #7: Is the core drilling through the floors by the contractor or by owner?

7.1. By contractor.

APPLICABLE TO THE PROJECT SPECIFICATIONS

8. 00 01 00 – TABLE OF CONTENTS

8.1. ADD Section 23 05 48 – Vibration Controls for HVAC.

9. 23 05 48 – VIBRATION CONTROLS FOR HVAC

9.1. ADD Section in its entirety.

10. 23 09 23 – INSTRUMENTATION AND CONTROLS FOR HVAC

10.1. Refer to Article 1.6, Paragraph B ADD Item 16

16 Airflow Monitor Transmitters (including factory-installed airflow monitors) BAS BAS BAS

11. 23 21 13 – HYDRONIC PIPING

11.1. Refer to Article 3.8, Paragraph A REMOVE sub-paragraphs 1. and 3. to read:

“A. Hot-water heating piping, aboveground, NPS 1-1/2 and smaller, shall be the following:

1. Type L, drawn-temper copper tubing, wrought-copper fittings, and pressure-seal joints.”

12. 23 21 16 – HYDRONIC PIPING SPECIALTIES

12.1. ADD Article 2.8

“2.8 CHEMICAL POT FEEDERS

A. Provide steel feeders with corrosion-resistant exterior coating, minimum 3-1/2-inch fill opening in the top, and NPS 3/4 bottom inlet and top side outlet. Provide a quarter turn or threaded fill cap with gasket seal and diaphragm to lock the top on the feeder when exposed to system pressure in the vessel.

1. Capacity: 2 gal.

2. Minimum Working Pressure: 125 psig.”

13. 23 31 13 – METAL DUCTS

13.1. Refer to Article 1.3 ADD Paragraph D

“D. Color Samples: For initial selection and verification of pre-insulated exterior ductwork finish.”

13.2. Refer to Article 2.3, Paragraph B, Subparagraph 3 REVISE subparagraph b

“b. Color selected by architect to match from RAL color chart.”

13.3. Refer to Article 2.3, Paragraph C, Subparagraph 3 REVISE subparagraph b

“b. Color selected by architect to match from RAL color chart.”

14. 23 73 43 – OUTDOOR, CUSTOM AIR-HANDLING UNITS

14.1. Refer to Article 2.9, Paragraph B, Subparagraph 4 ADD subparagraph c.

“c. Motor speed at N-1 redundancy design point: 100 Hz.”

APPLICABLE TO THE DRAWINGS

15. DRAWING SHEET S-104E – LEVEL 4 / ROOF FRAMING PLAN - EAST

15.1. Refer to Drawing A1, REVISE framing sizes.

15.2. Refer to Drawing G1, ADD Note 6.

“6. AT SIM., PROVIDE A 1/4" FILLET WELD ALL AROUND IN FIELD FROM HSS8x4 TO HSS16x4.”

16. DRAWING SHEET M-501 – HVAC DETAILS

16.1. Refer to Detail C3 ADD Note 9:

“9. Roof shall slope towards north side of unit, towards field installed gutters.”

17. DRAWING SHEET M-601 – MECHANICAL SCHEDULES

17.1. Refer to Bid Alternate #1 Water-to-Water Heat Pump/Chiller Schedule, ADD Remark 5.

“5. Minimum total capacity turndown shall be 5%.”

17.2. Refer to Custom Outdoor Air Handling Unit Schedule (Cont.), REVISE Supply Fan Array Size from 3x3 to 2x3.

18. DRAWING SHEET EP601 – ELECTRICAL SCHEDULES

18.1. Refer to Equipment Schedule General Notes, ADD Note E.

“E VARIABLE FREQUENCY DRIVES SHALL BE PROVIDED BY ELECTRICAL

CONTRACTOR.”

18.2. Refer to Equipment Schedule Specific Notes, REVISE Note 1. Omit first sentence as below.

“1 ELECTRICAL CONTRACTOR SHALL PROVIDE VFD. LOCAL DISCONNECT HAS

AUXILIARY CONTACTS CONNECTED TO THE VFD TO INDICATE THAT THE

DISCONNECT IS OPEN. PROVIDE INTERCONNECTING WIRING.”

ADDITIONAL ACCEPTABLE PRODUCTS AND SYSTEMS

19. 23 21 16 – HYDRONIC PIPING SPECIALTIES

19.1. Refer to Article 2.4, Paragraph A ADD American Wheatley.

19.2. Refer to Article 2.4, Paragraph B ADD American Wheatley.

19.3. Refer to Article 2.6, ADD American Wheatley.

20. 23 21 23 – HYDRONIC PUMPS

20.1. ADD Wilo.

21. 23 36 00 – AIR TERMINAL UNITS

21.1. ADD Enviro-Tec.

22. 23 57 00 – HEAT EXCHANGERS FOR HVAC

22.1. ADD API Heat Transfer.

23. 23 73 43 – OUTDOOR, CUSTOM AIR-HANDLING UNITS

23.1. ADD Air-Wise.

24. 23 81 19 – FAN COIL UNITS

24.1. ADD International Environmental Corporation (IEC).

Issued 2/7/2024

BBS 23008 VIBRATION CONTROLS FOR HVAC

Ames Laboratory 23 05 48 - 1 Wilhelm Hall HVAC Upgrades Bid Issue

SECTION 23 05 48

VIBRATION CONTROLS FOR HVAC (ADD#02)

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Elastomeric isolation pads.

2. Elastomeric hangers.

1.2 ACTION SUBMITTALS

A. Product Data: For each type of product.

1. Include rated load, rated deflection, and overload capacity for each vibration isolation device.

2. Illustrate and indicate style, material, strength, fastening provision, and finish for each type and size of vibration isolation device type required.

PART 2 - PRODUCTS

2.1 MANUFACTURERS:

A. Mason Industries.

B. Vibration Eliminator.

C. Vibro-Acoustics.

D. Kinetics Noise Control.

2.2 ELASTOMERIC ISOLATION PADS

A. Elastomeric Isolation Pads:

1. Fabrication: Single or multiple layers of sufficient durometer stiffness for uniform loading over pad area.

2. Size: Factory or field cut to match requirements of supported equipment.

3. Pad Material: Oil and water resistant with elastomeric properties.

4. Surface Pattern: Waffle pattern.

2.3 ELASTOMERIC HANGERS

A. Elastomeric Mount in a Steel Frame with Upper and Lower Steel Hanger Rods:

BBS 23008 VIBRATION CONTROLS FOR HVAC

Ames Laboratory 23 05 48 - 2 Wilhelm Hall HVAC Upgrades Bid Issue

1. Frame: Steel, fabricated with a connection for an upper threaded hanger rod and an opening on the underside to allow for a maximum of 30 degrees of angular lower hanger-rod misalignment without binding or reducing isolation efficiency.

2. Dampening Element: Molded, oil-resistant rubber, neoprene, or other elastomeric material with a projecting bushing for the underside opening preventing steel to steel contact.

PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine areas and equipment to receive vibration isolation control devices for compliance with requirements for installation tolerances and other conditions affecting performance of the Work.

B. Examine roughing-in of reinforcement and cast-in-place anchors to verify actual locations before installation.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 VIBRATION CONTROL DEVICE INSTALLATION

A. Coordinate the location of embedded connection hardware with supported equipment attachment and mounting points and with requirements for concrete reinforcement.

B. Installation of vibration isolators must not cause any change of position of equipment, piping, or ductwork resulting in stresses or misalignment.

3.3 VIBRATION CONTROL DEVICE SCHEDULE

A. Vibration control devices shall be installed per the following schedule. ASHRAE Types and base types are defined as follows:

1. ASHRAE Type:

a. ASHRAE Type 1: Elastomeric Pad.

b. ASHRAE Type 2: Elastomeric Floor Isolator or Hanger.

c. ASHRAE Type 3: Spring Floor Isolator or Hanger.

d. ASHRAE Type 4: Restrained Spring Isolator.

e. ASHRAE Type 5: Thrust Restraint.

f. ASHREA Type 6: Air Springs.

2. Base Type:

a. Base Type A: Direct Isolation.

b. Base Type B: Structural Steel Rails or Base.

c. Base Type C: Concrete Inertia Base.

d. Base Type D: Curb Mounted Base.

Item ASHRAE Type Base Type Maximum Deflection Notes

WWHP-A 1 A N/A -

Pumps 2 A 0.75” -

END OF SECTION

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MITER CORNERS, TYP.

EXHAUST FANS TO BE SET ON

EXISTING SUPPORT LOCATIONS.

WEIGHT OF NEW UNITS SHOULD

BE LESS THAN OR EQUAL TO

WEIGHT OF EXISTING UNITS.

SEE MEP FOR FURTHER INFO.

BID ALTERNATE #1

BID ALTERNATE #2

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HAS-E-55 ANCHOR RODS

(4 1/2" MIN. EMBED)

1/4

1/4

3/4" BASEPLATE w/ LEVELING NUTS

OR NON-SHRINK GROUT AS REQUIRED

SEE SECTION A-A FOR INFO.

EXISTING ROOF SLAB

EXISTING COLUMN

EXISTING BEAM

HSS BEAM, TYP. SEE PLAN.

PROVIDE 1/4" CAP PLATE

w/ SEAL WELD AT ENDS

10"

/2

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" 7" 1 1/2" TYP.

ALL STEEL EXPOSED TO WEATHER

TO BE HOT-DIP GALVANIZED

NOTES:

1. CONTRACTOR TO COORDINATE HSS LOCATIONS AND TOP OF STEEL ELEVATIONS w/ MEP & ARCH.

2. HRU CONNECTION TO STRUCTURAL STEEL BY CONTRACTOR

3. DO NOT DAMAGE EXISTING REINFORCING WHEN INSTALLING ANCHORS

4. CONTRACTOR TO FIELD VERIFY LOCATIONS OF EXISTING REBAR VIA APPROVED

NON-DESTRUCTIVE TESTING METHODS

5. SEE ARCH. & MEP FOR ALL NON-STRUCTURAL COMPONENTS

6. AT SIM., PROVIDE A 1/4" FILLET WELD ALL AROUND IN FIELD FROM HSS8x4 TO HSS16x4

SECTION A-A

M

IN

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VERIFY IN FIELD

T/ ROOF SLAB

PLAN NOTES:

1. CONTRACTOR TO FIELD VERIFY ALL RELEVANT EXISTING INFORMATION, INCLUDING EXISTING DIMENSIONS, CONDITIONS AND FRAMING.

2. SEE MECHANICAL AND ARCHITECTURAL DRAWINGS FOR DIMENSIONS AND INFORMATION NOT SHOWN ON THE STRUCTURAL DRAWINGS.

3. MECHANICAL UNIT SIZE AND LOCATIONS SHOWN ON PLAN ARE BASIS OF DESIGN, NOTIFY EOR IF FINAL UNIT DIFFERS.

4. CONTRACTOR TO VERIFY EXISTING BEAM AND COLUMN REINFORCING PRIOR TO INSTALLING ANCHORS. DO NOT DRILL THROUGH EXISTING REINFORCING.

5. WF BEAMS FOR AHU SUPPORT NOT ON GRIDLINES TO ALIGN w/ AHU PERIMETER AND SPLITS. SEE MEP DRAWINGS. CONTRACTOR TO COORDINATE.

6. ALL STEEL EXPOSED TO WEATHER TO BE HOT-DIP GALVANIZED.

7. STEEL SUPPORT FOR PRE-FABRICATED STAIR IS FOR BIDDING PURPOSES ONLY. DESIGN IS SUBJECT TO CHANGE ONCE FINAL STAIR DRAWINGS ARE PROVIDED.

8. AT STAIR STRINGER BASE ON PH ROOF, PROVIDE ANGLE (1/4" MIN. THICKNESS) w/ (2) 3/8"Ø HILTI HUS-EZ ANCHORS (2 1/2" EMBED INTO EXISTING PH ROOF SLAB), SEE STAIR SHOP DRAWINGS.

PROVIDE GROUT PAD BELOW ANGLE, SEE ARCH. FOR ADD'L INFORMATION. SEE PLAN FOR LOCATION.

TYPICAL FRAMING DESIGNATION

STEEL COLUMN

STEEL BEAM

MOMENT CONNECTION

CONNECTION SYMBOLS

BEAM OVER COLUMN

OWJ OR

BEAM SIZE

TOP OF STEEL OR TOP

OF JOIST ELEVATION

END REACTION

(SERVICE)

# OF HEADED STUDS REQ'D

CAMBER

18'-6"

W18X35 [20] C = 3/4"5k 5k

SHEET NUMBER

SHEET TITLE

REVISION DATE

CONSULTANT

LOCATION

PHONE

WEBSITE

219 EIGHTH STREET

DES MOINES, IOWA 50309

515-244-7167

WWW.BBSAE.COM

ISSUE DATE

PROJECT NUMBER

SUBMISSION

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23008

SC-24-622

01.10.2024

1 Addendum#01 01.31.24

NORTH

LEVEL 4 / ROOF - FRAMING PLAN - EAST

1/4" = 1'-0"

A1

3/4" = 1'-0"G1 BID ALTERNATE #1 - FRAMING DETAIL

N

KEY PLAN

EAST WEST

MATCHLINE

REVISION DATE

1 ADDENDUM#02 02.07.24