12505B22R0009_QAs through 7722_NSERL West Lafayette IN_Replace AHU 1.pdf

Solicitation: 12505B22R0009 Replace AHU‐1, West Lafayette, IN Questions and Answers through 7/07/2022

Question Answer 1 1.Keyed Note 13 on Sheet 1 for New Installa on describes removal and replacement of the units through the existing intake louver opening. However, there is a mature tree that has grown close to the louver, blocking a portion of the opening (see photo). Minimum breadown sizes of the new unit are being confirmed with the manufacturer. This should be confirmed next week. If the opening is confirmed too small because of the encroaching tree:

A.Can the tree be cut down?

B.Can the tree be temporarily removed with a tree spade and replanted when work through the louver is complete?

C.Can an opening be made in the roof above the

Mechanical space be made and patched back?

Purdue University landscaping department would like to retain the tree and will perform trimming of the tree to allow access to the louver opening. Contractor shall include in their pricing all coordination with USDA / Purdue University for the tree trimming needed for the project.

Contractor shall not include in their pricing any tree removal / trimming by the Contractor. Contractor shall include in their pricing the restoration of grounds in accordance with the SOW. Cutting an opening in the building's roof is not acceptable to USDA.

2 How many ton unit is the existing AHU‐1? Information available on the existing AHU‐1 is as indicated in the existing drawings included in the solicitation package. See Coil Schedule on Sheet H‐15 (dated 9/29/1979); Air Handling Unit Schedule on Sheet HPE‐4 and other drawings for additional information. See response to question 6.

3 Can a VAV schedule for the existing units be posted?. See Testing and Balance Schedule that follows Section 23 05 13 of the Project Specification.

Questions and Answers through 7/07/2022

4 Is there any glycol in the existing HVAC system? Exact level of glycol in HVAC system is not known, Contractor shall assume some level of glycol is present. Any draining of the system for the AHU‐1 replacement shall include all means and methods to limit the amount of fluid drained. Any fluids drained shall be captured and shall be legally disposed of by the Contractor. Prior to any demolition work, Contractor shall sample and test for existing glycol levels and to determine the "per cent" level of glycol in the system. Contractor shall submit test results along with the recommended amount of glycol to be added to the system to Owner for review. Contractor shall add new inhibited glycol to the system. The amount to be added shall be as directed by the Owner and shall not exceed nomimal 200 gallons. New glycol shall be inhibited propylene type. Contractor shall provide all hoses, pumping equipment, and connection(s) to add the glycol to the existing HVAC system. Contractor shall employ means and methods to add glycol in an efficient manner while limiting waste.

5 Base Bid: Do you have a schedule or a me frame that is job has to follow (hard deadline of completion)?

Period of Performance will be extended, see amendment for additionlal information. The "on‐site" work for this project shall be scheduled and performed during a time period when mild outside weather conditions are anticipated to limit the need for heating and cooling. See General Note #2 on Sheet 1 for additional informaiton.

6 Base Bid: Are we replacing the Ahu for the same size, flow, capacity…?

New AHU shall meet the requirements indicated in the Mechanical Equipment Schedule on Sheet 2 of the Drawings, shall be as specified in Mechanical Specifications on Sheet 2 of the Drawings and shall meet all requirements indicated in the solicitation package.

Questions and Answers through 7/07/2022

7 Base Bid: Are we allowed to re‐use the UV System that is in place on the current AHU?

Contractor shall remove UV system from AHU‐1 and shall re‐install UV sytstem at new AHU. Contractor shall modify and extend associated electrical installations and re‐connect the UV system. Placement and installation of UV system at new AHU shall be in accordance with UV system manufacturer's instructions and recommendations.

8 Base Bid: The current housekeeping pad is in good shape can it be reused for the new AHU?

Contractor shall reuse existing housekeeping pad of AHU‐1 and shall clean / prepare existing housekeeping pad prior to installing new AHU.

Mechanical Room B, also, has an abandoned housekeeping pad.

Contractor shall coordinate the exact location of this abandoned pad with Owner; Contractor shall remove this abandoned pad and provide associated floor patching. For pricing purposes, Contractor shall assume the abandoned pad is 4' long x 4' wide x 4" high.

9 Base Bid: The hot water booster pump was replaced last year, can it be reused?

Contractor shall reuse existing hot water booster pump in new AHU‐1 installation. Contractor shall remove existing hot water booster pump and re‐install in new heating water piping system of new AHU‐1. Re‐ installation of booster pump shall include providing electrical power and control interlocks to the booster pump as indicated on Sheet 3 of the Drawings. Contractor shall provide placement of the booster pump in the new heating water piping system to match the existing installation.

10 Bid Option: A barrier system was installed in room 124 last year, does it need removed and replaced? If so do you have a spec for the correct barrier system?

Barrier system in Room 124 has been purchased and installed by USDA.

Delete the work of Bid Option 03 from the project’s scope of work.

Contractor shall not price Bid Option 3. Contractor shall indicate “Bid Option 03 Deleted” in the bid form. HVAC system improvements in Room 124 (Bid Option 02) shall be priced by the Contractor.

11 Other Bid Options: More information is needed for the room ventilation up grades

Contractor shall base pricing on bid options using information provided in the solicitation package.

Questions and Answers through 7/07/2022

12 On Sheet #2, the schedule calls for BP‐1 to be replaced like for like with the exception of a prem. Eff motor, but there is no indication of what B&G pump is currently installed there. Can you find that answer please? I did not see a picture of the pump in the existing photos.

See response to Question 9.

13 One Sheet #1, Note 22, they call for the pump to deliver

35.1 GPM @20’ TDH, but on Sheet #2 schedule, they call for

BP‐1 to deliver 40 GPM @ 10’ TDH. Can you clarify?

See response to Question 9.

14 Could I get a detail for this pump as well please? See response to Question 9.

15 The new AHU sections will not fit through the existing louver so the unit can be install in the Mechanical Room.

How is the new unit to be installed?

New AHU shall be modular type and shall be sized and in configurations to allow movement and placement into the Mechanical Room. See Note 17 in AHU‐1 specifications on Sheet 2 of the Drawings. Contractor shall include in their pricing all cost for any "on‐site" disassembly / re‐assembly of modules for placement into the Mechanical Room.

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