A21 - Amendment 1 Questions and Answers - Pump Around.pdf
PDF 82 KB Posted
- Attached to
- B. Everett Jordan Dam Bypass Pumping
- Solicitation number
- W912PM-24-R-0022
About this file
This document is a set of Questions and Answers related to Amendment 1 of the solicitation for the B. Everett Jordan Dam Bypass Pumping contract opportunity.
The key details are:
- The requirement is to maintain a minimum 40 CFS flowrate from the lake to the Haw River regardless of lake level, with the potential for USACE to lower the lake level 1-3 feet prior to the pumping operation.
- Pumps must be placed at an elevation no lower than 234.2 feet NAVD88 to avoid inundation as the lake level is expected to rise during the work.
- Fencing requirements include 6-foot fencing around the pump staging area and temporary fencing at constricted public access points along the bypass discharge piping.
- No sound attenuated pumps are required, and composite mats and double-walled fuel cells are acceptable. There is no pay allowance for site restoration, as the contract is intended to be firm fixed price.
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Other files
| File | Type | Posted |
|---|---|---|
| A21 - 24R0022 Amendment 1.docx.pdf | ||
| EM 385-1-1 15 MAR 2024.pdf | ||
| A21 - 24R0022 Bej Pump Around Solicitation.pdf | ||
| SOW.pdf |
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Text version
1. The normal lake elevation at B. Everett Jordan is around 216 feet NVGD29 (215.2 feet NAVD88)
a. Question: Is the requirement to maintain this level or lower the lake level beyond this elevation?
Response: The requirement is to maintain a minimum 40 CFS flowrate from the lake to the Haw River regardless of lake level. Prior to initiation of the pump around, USACE may lower the lake level 1-3 feet in preparation for the additional storage that will accumulate during the minimum 40 CFS pump around. For perspective, the typical discharge of the dam to the Haw River is 200 CFS or more. With winter weather events and below average discharges, the lake level lowering is not a likely scenario.
2. “All piping joints shall be flanged or fused and all non-submersible pumps should be placed at an elevation no lower than 234.2ft NAVD88.” If the lake level lowers below 210 Feet NAVD88 then the temporary pumping system will not be able to achieve the flow requirements
a. Question: After a site visit, we found a suitable, level area, for pump placement is located between elev. 226’ and 224’. By lowering the base elevations for the pumps, this will allow them to pump more efficiently, burn less fuel, and be reduce the number of pumps required to maintain 40 CFS. Is any allowance given to place pumps at a lower elevation to reduce static suction lift as the distance between the suction end of pumps and lake water is quite significant? We can provide pumps with containment skids.
Response: The lake level will rise during this work, not lower. Pool (lake) levels rose to 230 feet during the last pump around. These levels can rise quickly, and pump inundation is a concern. To avoid potentially having to move the pumps upland during the operation, we are requiring pump elevation to be at 234.2 feet NAVD88 or above.
3. The required fencing requirements are unclear as to the scope.
a. Question: Is there a fencing height requirement around the operational pump staging area?
Response: 6 feet.
b. Question: Is construction fencing required along the entire length of the bypass discharge piping?
Response: No. temporary fencing, as described in the SOW, may be implemented at constricted public access points to designate the construction area and block off public access.
c. Question: Is temporary fencing required around the entire construction area because it could be quite extensive?
Response: No. See the response to 3. b.
4. Are there any access limitations to access the project site? Jordan Dam Rd, and the access road off Pea Ridge Rd.
Response: No.
5. Is sound attenuated pump required for bypass pumps to reduce the noise impact of diesel driven equipment?
Response: No.
6. Are composite Mats acceptable for temporary access instead of timber mats which could transport noxious weeds from prior projects?
Response: Yes.
7. Is UL listed double walled fuel cells with containment acceptable for temp fuel storage for the 21 day operation to reduce the number of fuel drops onsite?
Response: Yes.
8. Could there be an pay allowance for site restoration?
Response: No. The contract is intended to be firm fixed price.
File details come from the government source that posted it. Updated .