Q A Sac Mech.doc

ARRA Sacramento Locations Mechanical Improvement Questions and Answers

1. Regarding the Robert T. Matsui Courthouse in Sacramento.

· You specify two condensing boilers, EWT: 110F, why are you tying them into the same loop as the firetube (non condensing) boilers?

· It states that the condensing boilers shall be 10:1 turndown. Is this implying a turndown ratio over the total capacity (6 MMBtu/hr)?

· The condensing boilers will require Cat IV, AL29-4C, boiler flue. Where will we run this stack? We can not tie into existing.

· Regarding the retrofit on the existing firetube boilers, are we to tie into existing enhanced controls?

· Have you verified that you can convert the primary hot water loop to variable flow? It should remain constant.

2. Request asbuilt documents showing the mechanical systems of both buildings.

3. Provide the sign in sheets from both of the prebid meetings.

Please see attachments.

4. Contractor spoke to Trane’s (manf. of existing chillers at 501 I Street) Sales Engineer about the variable flow retrofit for the project. Trane recommends replacing the chiller’s existing controllers with controllers designed for variable flow systems. Should the cost of new chiller controllers be included in the proposals?

5. In order to determine the costs for Project 6” (replace existing v-belts with synchronous belt drives), it would be helpful if we had a the manufacturer, model # and serial # for the air handlers. Please provide this information if it is available.

6. It would be of great assistance to the bidders on this project if you could provide us “For Reference Only” “As-Built” mechanical pdf drawings of the 501I Street facility. These would increase our understanding of the project, and help us to better understand the scope of this project.

7. Please identify which fans require the synchronous drives by AHU tag number per project 6.

8. Please provide the sign-in sheets for the two site visits.

9. Per the bridging document specification in section 1.1.5, please confirm what projects require stamped construction drawings, if any.

10. Per project 9, please provide the cooling load required for computer rooms 3217 and 4225. We need to know the present load requirement to price the replacement CRAC units.

11. Are there drawings available for 501 I Street and 2800 Cottage Way? It will be extremely difficult to effectively bid this project without mechanical and electrical as-built drawings of both facilities in the areas affected by this solicitation.

12. Regarding projects 11 and 13, are actual floor plan graphics required on the new Metasys ADX server or are we to match existing?

13. ) Are there drawings available for 501 I Street and 2800 Cottage Way? It will be extremely difficult to competently bid this project without mechanical and electrical as-built drawings of both facilities in the areas affected by this solicitation.

14. There is another job walk scheduled for this Tuesday, February 2 at 9:00 AM at 501 I Street and 1:00 PM at 2800 Cottage Way. It would be beneficial if someone from Enovity who has intimate knowledge of the scope of work required be present for these walks so that we can better understand what is expected.

15. The existing control systems in both buildings have ARCnet to Ethernet converters. Is the controls contractor expected to leave these converters or remove them?

16. At 2800 Cottage Way the chiller room control panel contains a Johnson Controls MIG (Metasys Integrator). Is this communicating with the Carrier chillers comfort link control system?

17. About the Robert T. Matsui United States Courthouse “Project 2 : Install two pony 3.0 MMBtu/hr high efficiency condensing boilers and repair hot water distribution loop”. Part 2 of Project 2 line number 7.

· Is the 10:1 turn down ratio was a total turndown ratio for the two new condensing boilers combined with each boiler requiring a 5:1 turndown?

· What condensing boilers are on the market that can provide a 10:1 turndown ratio?

18. Is there anyway we can get an additional information and as-built drawings for the existing mechanical system?

19. With respect to the GSA solicitation # RECOVERY-GS-09P-10-KS-C-0043, Siemens is requesting that Siemens APOGEE be added to the list of acceptable controls solutions as described in specification section 2.1-G.

I am not sure if we should consider this.

20. About Matsui Fed Courthouse Building - need to know the heat-load of the two data centers so we can size the air conditioners for each. Item 9 in the attached scope of work.