FTQW23-1400 Install Lift Station generators Questions.docx

FTQW23-1400 Install Lift Station Generators

Questions

1. Attachment 4 SOW paragraph 3.2.2 references a "new pump house". Please confirm this is a typo.

· This is a typo which was removed in an updated document.

2. Does the Government desire gensets equipped with outdoor "reach-in" minimally heated metal-clad enclosures or "walk-in" environmental enclosures?

· Walk-In environmental enclosures with space heaters and insulated for artic climate.

3. Are the double-throw bypass switches intended to provide means to switch the lift station supply from utility source to a connection point for a portable generator?

· This is correct. We must have a means of hooking up an alternate generator in the event that the primary goes down.

4. Should a 20kW (50% genset rating) radiator-mount load bank be included (with load leveling control) to ensure adequate loading is provided when genset is supplying the load, or being exercised (automatically by ATS programmable exerciser, say 30 minutes a month) to maintain readiness?

· Yes. Since these generator sets won’t always have pumps running to keep them loaded, a load bank would optimize monthly, semi-annual, and annual testing.

5. What is required standby run time for sizing the sub-base fuel tank (i.e. 24 hours @ 100% load, etc..)

· Unified Facility Criteria specifies 24-hours of storage at full load when a reliable delivery source is available. Given the circumstances that Eielson faces in the winter, we would strongly recommend, and prefer 72-hrs of storage at full load.

6. Attachment 4 (Statement of work), section 3.2.2 indicates, “The Contractor shall provide the Government with all the design documents necessary to construct the new pump house”. The 100% design, minimum submittal requirements, sub-bullet 2, indicates, “Updated drawings to provide a constructible pump house …”. Please confirm that this project is not providing any design of a pump house.

· This project is not providing any design of a pump house. This typo was removed in an updated document.

7. Numerous locations in Attachment 4 and Attachment 7 reference a “40kW 120/208VAC” generator. Attachment 2 (Asbuilts) indicates that the French Creek site has a 400A panelboard with 117 kVA of calculated load and that the Moose Lake site has a 400A panelboard with 108 KVA of calculated load at 208Y/120V. At the French Creek and Moose sites, is the intent to use 40kW generators (which may be undersized)? Alternatively, should the generators be sized to match the asbuilt calculated load (~125 kVA generators), or be sized to match the 400A service rating (~150 kVA generators)?

· These generators weren’t sized to support the entire facility. There are existing double throws switches the automatic transfer switches and generators were sized to…not to the service panelboard. All load studies were conducted prior to listing generator sizes in the authorizations to AFCEC.

8. Numerous locations in Attachment 4 and Attachment 7 reference a “40kW 120/208VAC” generator. During the site visit on 04/13/2023, it was noted that the Glacier lift station is served at 480Y/277-volt, 3-phase, with a 200-amp service. Please confirm that a 480Y/277-volt generator should be provided at this site and not a 208Y/120-volt generator. If so, should it be sized at 20kW (equivalent to a 40kW 208Y/120V), or be sized to match the 200A service rating (175kW)?

· Not sure where 40kW 120/208VAC came from, but our request for Glacier Lift Station was a 60kW 277/480 VAC generator. This sizing was determined by a record review and load analysis. Mission essential loads are the only thing we are authorized to have backup power for so matching the 200A service rating would not be the solution.

9. During the site visit on 04/13/2023, it was noted that the Glacier site is already equipped with a manual transfer switch downstream of the service disconnect. Should this manual transfer switch be removed after when the new transfer switch is installed?

· Yes. There will be no need for a manual transfer switch to be left in place.

10. Attachment 7 (Brand Name and Supporting Documents) refers to a 225 Amp Bypass transfer switch. The Moose Lake and French Creek sites have 400A service disconnects. A 225A transfer switch cannot be installed and protected by a 400A service. Please confirm that 400A transfer switches should be provided at these sites.

· These generators weren’t sized to support the entire facility. There are existing double throws switches the automatic transfer switches and generators were sized to…not to the service panelboard. All load studies were conducted prior to listing generator sizes in the authorizations to AFCEC.

11. Attachment 2 (Asbuilts) does not include any asbuilts for the Glacier site. Are any asbuilts for the Glacier site available that the Government can supply?

· No – the government does not currently have as-builts for this site.

12. Attachment 4 (Statement of work) references generator, belly tank, and automatic transfer switch. Does the Government prefer a walk-in enclosure to house all the equipment, or should the equipment be configured separate pieces?

· Given the climate in Alaska, the best option for us is to have walk-in, arctic rated enclosures to house all of the equipment.

13. Attachment 4 (Statement of work) refers to a generator “belly tank” in many locations. Does the generator belly tank need to be sized to maintain a minimum runtime duration, or is a default/standard tank size adequate?

· Unified Facility Criteria specifies 24-hours of storage at full load when a reliable delivery source is available. Given the circumstances that Eielson faces in the winter, we would strongly recommend and prefer 72-hrs of storage at full load.

14. Attachment 4 (Statement of work) does not specify any requirements for generator exhaust mufflers. Are hospital-grade mufflers or other noise suppressors desired, or will a standard muffler suffice?

· Because these generators will be installed around housing and school-age areas, noise suppression is desired. Typically, the arctic enclosures we get have sound suppression better than your standard muffler.

15. Attachment 4 (Statement of work), section 4.1, does not list UFC 3-501-01. Please confirm this UFC does not apply, including Arc Flash Analysis and Protective Device Time-Current Coordination Studies.

· When sizing and spec-ing generators, we do not generally reference UFC 3-501-01 so this question is a little out of Power Pro’s realm. After speaking with Electrical on this matter, we have determined it would be safest to have the study conducted and included with the contract.

16. Attachment 4 (Statement of work), section 3.1, indicates that there may be hazardous materials encountered during construction. Please clarify if the Contractor is responsible for obtaining a hazardous material survey for the areas impacted by the scope of work.

· Yes. The two materials that may be encountered are asbestos and lead, and although neither are expected, section 3.1.1.b states “The Contractor is responsible for identifying asbestos containing material (ACM) prior to conducting maintenance, abatement, renovation, or demolition activities”. Lead paint is not expected as the housing areas served by these mech rooms were constructed in 1995, long after the ban on lead paint usage.

17. Are there any known contaminated soils within the work areas? Should a specified amount of contaminated soil be included in the bidder’s proposal?

· Those locations are not in areas of known contamination. The soil will just need to be field screened with a photoionization detector (PID). As long as you don't have to dewater you should not need to stockpile and conduct laboratory testing unless the PID comes back with high readings, or you notice spilled chemicals.