GLEN 12-1027 RFI 001 Responses.pdf

B420 Water Pumps FA2550-20-R-0002 GLEN 12-1027 RFI 001

NOTE: DUPLICATE QUESTIONS WERE REMOVED

01. Are there any isolation valves to be on the DDC system? None are currently shown, only pump control valves are shown.

CE Response: See below for picture of current HSQ system of Pump House. All pump control valves shall be shown, monitored and controlled by the DDC system in accordance to the design.

02. Is there a reason that all piping over 4” is shown to be ductile iron? Usually ductile iron is used below ground and exposed steel piping is not concrete lined. Can we use schedule 40 steel pipe with welded flanges in the pump room and Ductile iron for the 10 foot section outside the room?

CE Response: Please use piping called out in the design.

03. What DDC front end is currently used on the facility? Was the intent for a whole new front end to be installed to control this system or are we to integrate into an existing system?

CE Response: HSQ is already located on site but we are working on transferring more stuff to

SIEMENS. Please install/integrate controls for the pump house in accordance to the design.

04. Are there As-builts for the current pump room and tanks? If so can you please provide?

CE Response: Please review all drawings in the 02 Design Analysis_Redacted - GLEN 12-1027, 04 Design Drawings - GLEN 12-1027, 05 Existing Conditions Drawing - GLEN 12-1027.

Existing AutoCAD drawings will be provided post award.

05. What are the tanks constructed of? Since we are to dig up to the edge of them to replace the pipe from the outside we need to know this so we can account for shoring/ bracing of the tanks if needed.

CE Response: Tanks are constructed of concrete.

06. Is there a HAZMAT survey for this building/ tanks? There are several notes about the contractor doing lead/ asbestos surveys but if there has already been one it should be provided as part of the bid documents. This survey would greatly help in narrowing down what items may need to be potentially abated.

CE Response: There are no asbestos or lead report available. Facility should not have lead as it was already banned before construction of Schriever AFB (previously known as Falcon AFB), however, some equipment may have lead.

07. Please provide photos of the existing gear.

CE Response: Please review all drawings in the 02 Design Analysis_Redacted - GLEN 12-1027, 04 Design Drawings - GLEN 12-1027, 05 Existing Conditions Drawing - GLEN 12-1027. If the requested picture is not included, please specify which “gear” is requested.

08. Please provide information on the PDP-FP and MCC-F2 to include make, model, manufacturer, and photos.

CE Response: Please review “02 Design Analysis_Redacted - GLEN 12-1027.” If not addressed in Design Analysis, then this can be provided.

09. Please provide photos of the pump station room existing configuration.

CE Response: Please review all drawings in the 02 Design Analysis_Redacted - GLEN 12-1027, 04 Design Drawings - GLEN 12-1027, 05 Existing Conditions Drawing - GLEN 12-1027. If unclear after a review of all documentation, the Government can provide additional information.

10. What is the ceiling height of the pump station room?

CE Response: Please reference sheet M-003, Pump Station Piping Sections for pump house elevations.

11. What does HSQ need for a control signal for the VFD?

CE Response: Analog Output 4-20ma signal.

12. Is there a contact for HSQ?

CE Response: Yes, Peter Polissky, polissky@hsq.com, 510-259-3782.

13. Please provide layout of existing electrical for demolition – conduit runs, etc.

CE Response: Please review all drawings in the 02 Design Analysis_Redacted - GLEN 12-1027, 04 Design Drawings - GLEN 12-1027, 05 Existing Conditions Drawing - GLEN 12-1027. If unclear after a review of all documentation, the Government can provide additional information.

14. Design Analysis Section Five references a specification list and reference to Appendix G.

Appendix G indicates “Specifications are attached separately”. Did not find the design specifications as part of the solicitation documents. Please provide the referenced design specifications.

CE Response: To be provided as Attachment 10 Specifications – GLEN 12-1027

15. Is the “shared wall” between the pump house and storage tank two, truly shared or is it an exterior foundation wall butted up to an additional tank wall? Please provide thicknesses of each wall, to be core drilled.

CE Response: See Attachment Foundation Drawing – GLEN 12-1027. The “Existing Water

Storage No.1” in the attached drawing is the same as “Storage No 2” that is referred in the question.

16. Please provide the depth of the piping connection points, from grade. If not known, please provide an assumption for bid purposes.

CE Response: Please review all solicitation documents. If the depth is not stated, ensure your assumptions are clearly stated in your cover letter or within your proposal.

17. Are there any utilities in the project area, other than the water lines? If so, please provide depths, locations and sizes.

CE Response: Please see Section 4 of the SOW.

18. Will the proposed wall sleeve (detail 3, M-004) need to hold hydrostatic pressure? What pressure will it be required to hold?

CE Response: Please reference sheet m-004, Mechanical Detail drawings for any required construction.

mailto:polissky@hsq.com

19. Equipment pad detail, M-004 shows “z” bar reinforcement from the new pad into the existing concrete floor. “z” bars cannot be installed into existing concrete, is the intent to drill and dowel straight bars or demolish the slab below and cast “z” bars in?

CE Response: Please reference sheet M-004 for design requirements.

20. Specifications do not identify EMT as being an acceptable raceway to be installed. The majority of the existing system is installed in EMT. Is EMT acceptable to be installed for this project?

CE Response: Please follow the required design requirements. For additional information please reference document Requirements - Combined Specifications, Section 26 05 00.00 40, para 3.2.1.

Also reference Section 40 95 00, para 3.1.1 (b).

21. Will new VFD's require Harmonic Filters to be installed? This space consumption has not been identified in the drawings.

CE Response: Please install in accordance with the provided design.

22. Will the magnetic flow meter need to be reinstalled during use of the temporary line?

CE Response: Please follow the provided design during the use of the temporary line.

23. Sheet G-003: Note #6 Drain water storage tanks (Who & where) 1.9 MG EACH?

CE Response: Reference Drawing G-003. The Contractor will drain the tanks to the west side of the building.

24. Sheet G-003: Note #6 How long of shutdown can we expect to get for the pump station?

CE Response: Reference document Requirements – Combined Specifications, Section 01 11 00, para 1.2.1. Also reference Section 01 14 00 para 1.3.4.

25. Sheet G-003: Drawing note pump #'s don't align with actual pump id in the pump station.

CE Response: See Drawing G-004 for original labeling and M-002 for new labeling.

26. Sheet M002: New pumps SP-1 & SP-2 are placed perpendicular to the existing pumps FP-1

& FP-2 that get removed; can we change the direction of SP-1 & SP-2 to salvage the existing pump pads?

CE Response: Place pumps SP-1 & SP-2 according to the design. Reference Drawing M-002.

27. Are there pipes and valves that require replacement on the exterior below grade that are not shown on the drawings?

CE Response: Install pipes and valves according to the provided design.

28. Exterior stairway demo possible? If we are replacing the existing suction and discharge lines for Tank #1 we will possibly need to demo & replace the concrete stairway and handrail on the North side of the pump station.

CE Response: Construct according to the provided design.

29. Is an asbestos or LBP report available?

CE Response: Reference Question 6.

30. Sheet M-001 notes 1 and 2 require the contractor to perform a survey for LBP and ACM.

Will this survey be required for the entire building or only as it applies to the work required for this project?

CE Response: Please reference provided design.

31. Sheet M-001 notes 1 and 2 also imply that the contractor will be responsible for any removal of LBP or ACM material. Without an existing report there will not be any way to determine what areas would need remediation. Please confirm that any LBP or ACM found during the survey would be handled as a differing/unforeseen site condition.

CE Response: Reference document Requirements – Combined Specifications, Section 01 35 26, para 3.1.2.

32. What size are the breakers in MCC-F2, specifically VFD 121, VFD 125, and VFD 126?

CE Response: Reference Sheet E-004, Electrical One Line Diagram drawing.

33. May a second site visit be requested due to the restrictions of personnel allowed on the site visit because of COVID 19?

CE Response: Personnel were not limited due to COVID-19 pandemic, but the number of personnel to be escorted. Exceptions up to 3 people were stated. No additional site visit is intended to be conducted.

34. Where is the contractor lay down area?

CE Response: Anticipated south of the water storage and west of the B420 facility.

35. How long does it typically take to get into the RA?

CE Response: Varies based on volume of individuals and time of day. If you saw how quickly the government representatives entered after checking in all of the visitors, it takes about that long for individual entry. Escorted individuals need checked in. Vehicle clearance would longer.

See SOW section 9 for additional information.

36. What are the requirements to get a badge for entry into the RA?

CE Response: The successful offeror is responsible for submitting paperwork for qualified individuals to serve as their own escorts. Upon background check and clearance, they would receive access. See SOW section 9 for more information.

37. Who is to provide escorts?

CE Response: The contractor would provide all required escorting, after successfully receiving badges and training. See SOW Section 9 for more information.

38. Is the Fire Department Connection (FDC) going to be connected to the building or in a remote location?

CE Response: The FDC will be in a remote location: Place FDC above ground to the south of the adjacent pad the FDC shall be not less than 18 in. and not more than 4 ft. above the level of the adjacent grade or access level. Reference: NFPA 13 para. 8.17.2.

39. Are the replacement fire (small) pumps required to be UL Listed fire pumps?

CE Response: Install pumps according to the design documents.

40. Do the contractors provide new signage for pumps, valves, and pipes?

CE Response: Contractor will provide nameplates for equipment according to Requirements –

Combined Specifications.

41. Are the Harmonic Brand filters for VFD121, VFD 125, VFD 126 going to be reused, replaced, or not necessary?

CE Response: Reference question 21.

42. SOW reference 2.5.1. mentions PVC piping, where are the PVC pipes located?

CE Response: Reference Sheet I-002, Process & Instrumentation Diagram drawing.

43. Is the base ok with one running pump at a time? Even if this means there is a single point of failure? Are the contractors expected to have temporary pumps to avoid this and maintain redundancy?

CE Response: Construction shall be staged such that only one pump is down at any given time after bypass is implemented.

44. Are there still problems with working on top of B420 if the tracking station is transmitting?

In the past, workers had to stop working and come down from the top of the building whenever they were transmitting.

CE Response: Please provide notice no less than 2 weeks in advance of anticipated work on top of B420 for proper coordination. Primary concerns with working on top of B420 consist of high elevation construction equipment interfering with transmissions.

45. What is the actual depth at the connection points?

CE Response: Please review all solicitation documents. If the depth is not stated, ensure your assumptions are clearly stated in you cover letter or within your proposal.

46. Will new VFD's require Harmonic Filters to be installed? This space consumption has not been identified in the drawings.

CE Response: Reference question 21.

47. Will CE drain the water tanks for the contractors? According to note 6 the contractors must coordinate with CE. What will be done with the water once drained? Where will the water from the tanks be stored?

CE Response: Reference question 23.

48. SOW 2.1.1.: Additionally, all steel piping infrastructure in and around Building 420 requires replacement, with pipes resized for the flows from the new pumps and equipped with new valves and fittings to provide simplicity of maintenance and repairs. (Are there pipes and valves that require replacement on the exterior below grade that are not shown on the drawings)?

CE Response: Reference question 27.

49. SOW reference 2.1.1. mentions replacing steel piping in and around B420, how do the contractors know what piping is around B420? Around is vague. Exactly what and where is the piping that needs to be replaced?

CE Response: Install according to the design drawings.

50. Exterior stairway demo possible? If we are replacing the existing suction and discharge lines for Tank #1 we will possibly need to demo & replace the concrete stairway and handrail on the North side of the pump station.

CE Response: See response to question 28.

51. Are any existing utility mapping records showing existing UG facilities (Comm., Gas, Electric, counterpoise, sanitary sewer storm sewer, etc.) that can be provided for the two larger areas of excavation North and South of the pump room? In the area north of the UG

Pump [House], there is going to be a significant excavation ranging from the northern wall of the UG pump house to approx. 75’ north at depth ranging from 27’ VF to 15’ VF to access lower piping. The south wall approx.. 40’ LF at a depth of 15’ VF.

CE Response: No utility mapping records available. Please reference SOW 4.2.

52. Is an area north of the pump house available to store generated stock piles of excavated material? The approx.. size of footprint for stockpile is 200’x200’. Will additional SWPPP be needed for this area as well?

CE Response: An area north of the pump house may be available to store generated stock piles of excavated material. Refer to attachment SAFB Environmental Supplement for requirements:

“For all soil disturbance of more than 1 acre, the Contractor shall prepare a Storm Water

Pollution Prevention Plan (SWPPP) meeting all requirements specified in the construction general permit and will include the Contractor’s Best Management Practices for erosion and sedimentation control at the site.”

53. The excavation that is taking place on the north side of the existing UG pump house is going to be Approx. 25'-30' VF deep (at the top of the slope that rises as you approach the top of the water storage tank and continue back toward the rear of the water storage tank) and around

40-50 along the east side of tank, are there any concerns regarding lateral pressure from the water once the earth backing is removed and leaving that tank full during construction? Or can tank #2 be drained (or lowered to a "minimal level"), while tank #1 remains at capacity during the proposed exterior work?

CE Response: Reference Sheet G-003, Site Plan and Site Station Bypass drawing.

54. With the addition of a vertical offset on the 5 lines labeled as "from WS-4 to TK-1","from

FP-3 to TK-1"," from TK-1", " to Distribution System" and "from TK-1 to WS-4" is there any as-builts reflecting a fully restrained UG system? If not, is the addition of a CTRB ( reverse anchor) needed to be installed on the piping to remain in order to restrain the new proposed offsets, so no separation will occur on the existing system to the north and to the south?

CE Response: No, there are no as-builts reflecting a fully restrained Under Ground system.

Please perform construction according to design drawings.

55. Need breaker information on PDP-FP breakers and panel. It is an ITE panel. ITE breakers are replaced by Siemens or refurbished option?

CE Response: ITE breakers should be replaced by Siemens as shown on Sheet E-004, Electrical

One Line Diagram drawing.

56. Who is current controls contractor?

CE Response: HSQ is the current controls contractor.

57. Send photos of the concrete pump pads.

CE Response: Please review all drawings in the 02 Design Analysis_Redacted - GLEN 12-1027, 04 Design Drawings - GLEN 12-1027, 05 Existing Conditions Drawing - GLEN 12-1027. If not included after a review of all documentation, the Government can provide additional information if determined to be necessary.

58. Plan Sheet M-0004- Will the new maintenance pump pads need to be placed over new concrete with rebar hooks embedded into concrete slab or can the pads be secured into the existing slab using epoxy and rebar?

CE Response: Construct according to design drawings.

59. What testing is required for new breakers?

CE Response: Reference document Requirements – Combined Specifications, Section 26 05

71.00 40, para 3.2.1.

60. Can schedule 80 PVC pipe be used instead of the AWWSC205 piping?

CE Response: Install piping according to design.