RFIs_140P8122R0003_Replace_Backflow_Preventers_0001.pdf

5/4/2022

RFIs: 140P8122R0003 Replace Backflow Preventers

Q1. Will keys be issues for locks to the devices and meters?

A1. No, Some are unlocked and others will need to be coordinated with Park Staff.

Q2. Is a map for the devices available? As locating the devices has been difficult, and most unfound.

A2. No map, but description of location is available.

Q3. Are civil as-builts available? As on locating each device, when a device was located, NO shut off located.

A3. As builts of the areas available but may or may not be detailed enough to show shut-offs.

Q4. The Documents issues called “Backflow Preventor Specification List”, has a greater number of devises listed for each area than spelled out in the SOW. Are we to follow the list of devices listed in

RED?

A4. Yes, just the red (testable) units.

Q5. When reviewing the “Backflow Preventor Specification List”, devices listed in RED, the number of devices in each area is as follows:

o Echo Bay 17 o Callville Bay 18 o Las Vegas Bay 15 o Cottonwood Cove 20 o Temple Bar 16 o Willow Beach 21

The above totals 107 total devices, was there devices that need to be omitted from our Proposal?

A5. No, Please Use the “red” units for your count.

Q6. Are we to replace the existing device with SAME manufacture as listed on the “Backflow Preventor Specification List”?

A6. Not necessarily, New units must meet specs in the SOW.

Q7. The “Backflow Preventor Specification List”, has a number of devices other the RPXX. Should all devices be replaced with RPPA’s?

A7. Units to be replaced with like units. No changes to different style.

Q8. Are we to use/ reuse the existing strainer on the prior to new device?

A8. If it is part of Device, yes. If not please reference the SOW. “Work includes associated mechanical joints needed, parts, new piping, gaskets, fittings, thrust blocking, delineation, flagging, traffic control, backfill and labor where needed to provide a functioning water distribution system that satisfies the needs of the NPS unit as determined by NPS personnel.”

Q9. Are we to replace any unnecessary fittings? Such as the riser pipe and setter underground or if the new valve matches the space of the existing device opening.

A9. As the SOW states “Work includes associated mechanical joints needed, parts, new piping, gaskets, fittings, thrust blocking, delineation, flagging, traffic control, backfill and labor where needed to provide a functioning water distribution system that satisfies the needs of the NPS unit as determined by NPS personnel.”

5/4/2022

Q10. Some devices have a metal screen enclosure, open to the elements. Should this be replaced with a weather resistant HOT BOX enclosure?

A10. Nothing outside of SOW is to be performed without approval.

Q11. Many devices have NO Weather HOT BOX. Are we to provide each device with a NEW, box?

A11. No.

Q12. If a HOT BOX is required, we will need to place a concrete pad for each box? If so, will the Hot Box require a Concrete Collar also?

A12. N/A

Q13. Will a Bid Bond be required?

A13. No, This requirement will be awarded as a service type contract with the incorporation of the Service Contract Act.

Q14. Will a P&P Bond be required?

A14. No, This requirement will be awarded as a service type contract with the incorporation of the Service Contract Act.

Q15. Do we have exact backflow preventer sizes, and types on a list for replacement at (6) sites?

A15. The spreadsheet attached to the solicitation is the best list available.

Q16. The excel spreadsheets are helpful, however not 100% clear on the devices needed for each site.

Has a cross connection survey been conducted on each site?

A16. Not recently. Spreadsheet is the result of last survey.

Q17. On the assemblies that are being replaced do they currently meet the degree of hazard for the application? Concerned about replacing and ordering parts for change out without being certain. Will these assemblies require anti-freeze bags?

A17. Yes. No freeze bags if not already installed.

Q18. Supply lines in and out of assemblies do they need wrapping for cold weather climate?

A18. Only is already wrapped. I do not know of any that are wrapped offhand.

Q19. Is there any concrete and or asphalt needing destruction and repair after installs?

A19. No.

Q20. Will assemblies require mesh screen strainers? or is this open to contractor discretion?

A20. New install must match or be equal to existing.

Q21. Any devices needing change out serviced by a recycled and or reclaimed water line?

A21. All “red” marked devices are potable water.

Q22. Is there any critical service lines that cannot be interrupted during certain hours?

A22. 72 hour notice is required for shutdowns. Coordinate with COR for Marina supply lines.