Questions_and_Responses_-_PEX.pdf

SOLICITATION IFBP01141600001

REPAIR WATER STORAGE TANKS

FCC PETERSBURG – PROJECT 1B2X

QUESTIONS AND RESPONSES

Submitted by Portable Water Systems, LLC Questions for sizing temporary storage

1. Population on System?

• CLARIFICATION: 3,500

2. Number of taps on System?

• CLARIFICATION: One.

3. Any Customers/business that require a lot of water or a certain pressure requirement?

• CLARIFICATION: The elevated tank only feeds FCC Petersburg.

4. How many gallons does the system use per day?

• CLARIFICATION: 500,000

5. Number of water storage tanks in this system?

• CLARIFICATION: One 500,000 gallon ground storage tank.

6. List the tank names, tank locations, capacity of each tank, heights of each tank?

• CLARIFICATION: Refer to drawing in Amendment 0001.

7. Does the tank/tanks have a single inlet/outlet pipe or is there two lines per tank? What are the pipe sizes going into and leaving the tanks?

8. What is the elevation at the base of each tank?

9. What is the lowest elevation on this system?

10. What is the highest elevation on this system?

11. How is the water delivered to this system? Ex. pressure relief valve, pumped?

• CLARIFICATION: Pump

12. How Many pumps pump to the tank?

• CLARIFICATION: Two.

13. What is the GPM of each pump?

• CLARIFICATION: 733 GPM @ 164’ TDH

14. Do the pumps alternate?

• CLARIFICATION: The pumps are operated manually by our Power House Staff, The power house is manned 24 hours a day. They maintain the tank level by reading the pressure gauge.

15. Do the pumps ever run at the same time? How often?

• CLARIFICATION: No.

16. Where are the pumps getting the water from? ex water plant, clear well, a different system?

• CLARIFICATION: We receive our water supply from Virginia American Water Company.

17. What is the Elevation of the pump station?

• CLARIFICATION: Ground level

18. What is the pressure before the pumps?

• CLARIFICATION: Gravity feed from the ground tank.

19. What is the operating pressure after the pumps?

• CLARIFICATION: We maintain the pressure between 68 psi to 70 psi.

20. What size line is feeding the pumps?

• CLARIFICATION: 6”. We have a by-pass piping system that will by-pass the elevated tank and allow a rented pump to pump from the ground tank to the main feed line. The connection size for the by-pass is 6”.

21. What size line is the pump/pumps pushing into?

• CLARIFICATION: 6”

22. How is/are the pump/pumps controlled?

• CLARIFICATION: See answer to question 14.

23. Are there any delays in the communication between the pump controls and the pumps?

24. What is the current setting for the pumps to turn on? Off?

25. Will the pump controls remain live with the existing tank off line?

• CLARIFICATION: No, A VFD pump will have to maintain system pressure of 65 psi to 70 psi

26. Any other systems pulling from this system?

• CLARIFICATION: No.

27. Any connection points to the system at the existing tank?

• CLARIFICATION: Yes.

28. Any connections to the system at the pump station?

• CLARIFICATION: Yes.

29. Are the threads on the fire hydrants in this system NST/NH threads?

• CLARIFICATION: NST

30. What size ports on the fire hydrants? How many of each size?

• CLARIFICATION: Two (2) 2-1/2” NST Ports and one (1) 4” NST Port.

END OF QUESTIONS AND RESPONSES.