B09_Attachment_3_Site_Visit_Q_A_Flume_Enclosure_0001.docx

Flume Enclosure Site Visit Questions August 2021

Schedule -- We are not sure that the schedule for completion is realistic with deliveries on doors and windows. There are some notes about STC classifications for doors, windows and walls and some of those may impact schedule as well.

Response: We are aware of long delays on materials and don’t foresee any issue with allowing more time for completion at this point. Any long lead material that will delay completion time shall be communicated at the earliest point possible after award.

Architectural -

1) We want to make sure that the sound deadening materials are necessary especially at doors and windows.

Response: Sound deadening is necessary on doors and windows.

2) The desire for a 25lb/sf load on top of room was discussed. The heights of the ceiling relative to the 'roof' make it a challenge to be able to get a structural solution that will provide the strength needed overhead, but allow room for lighting and drop in ceiling. If the top of the 'roof is raised, it may not be possible to get under the main beams of the existing roof structure from one section to the next Response: Given that the reason for the load bearing roof is for maintenance access, using a drop ceiling grid that allows access to above ceiling structures and utilities is acceptable. Revisions to be noted in revised SOW.

3) Some of the details of the edges of the room may provide some challenges with the existing pre-fab structure to the south of the new room having some pieces that stick out into the new construction area.

Response: The protrusions in question will be removed.

4) Using metal studs for construction on 2' centers with 5/8" drywall which is more standard for commercial construction and door frames are typically made to suit that (but it would be more than the 4 1/2" overall wall thickness called out) It might be wise to use an exterior grad metal stud to have increased corrosion resistance.

Response: The added dimension would be nominal and not present any obstruction to the final designed intent.

5) Materials for door and window frames are not really listed and we do not know how much concern there should be about wet area installation. Also should windows be double paned glass or is single pane sufficient -- the document calls for safety glass.

Response: Exterior grade material would meet our needs and single pane glass should be sufficient because we don’t require the insulation provided by multi-pane glass in a climate controlled environment.

6) We discussed the use of FRP for wall treatment -- it was not called out, but would have superior resistance to water.

Response: FRP would add significant water resistance with little additional cost.

Electrical

1) We believe that we can get power from the junction box near the south edge of the new fume hood without running a new conduit from the panel. This would be sufficient for lights and, if desired, outlets.

Response: Agreed. This would be a prime location to deliver power.

2) There is no call for power outlets at this point, but typical construction puts outlets every 6' or so along new walls for standard power uses. If that is desired, it could be done, or could be left to be done later with surface mounted installation.

Response: Outlet requirement added to SOW.

HVAC

1) There is a mention of having a ventilation register in the top of the structure, and a grille on the east wall for air to leave, but if there is nothing forcing the air into the enclosure, it will not be likely to move through these openings. It would be possible to connect duct from the supply ductwork to feed into the room and then leave an opening for that air to exit, or it might be possible to install a fan at one of the openings (like the east wall) to pull air through the room. Ideally there would be a few inlets on the west side of the room if the east is where it leaves in order to get some cross ventilation.

There are many factors that could be helpful in determining the proper ventilation rate, but with the exposed water surface which will generate humidity as well as the equipment heat load, the level of ventilation may need to be more than would be typical of a 'lab' environment.

Response: Supply branches off the main HVAC supply duct can be added into the room. It would require venting to the exterior of the room for return. Two supply branches from the main duct to the west side of the room and two return grills on the east wall. Revisions to be noted in SOW.