Addendum 1 Narrative.docx
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About this file
This document is an Addendum (Amendment #1) for a VA project involving Reusable Medical Equipment (RME) Storage and HVAC upgrades at a facility in Columbia, MO, with project number 589A4-24-101. The amendment comprehensively revises multiple technical specification sections and drawing sheets across mechanical, electrical, plumbing, and architectural disciplines, including significant changes to:
Key modifications include updates to mechanical systems like air handling units (ACA-AHU-1 through 4), terminal units, ductwork, piping configurations, and control systems; electrical modifications for power connections to new equipment like an in-line pump (ACA-AHU4-P-1); and architectural changes involving construction barriers, ceiling removals/reinstallations, and room reconfigurations in areas like Clean Storage 490, Procedure Rooms 489 and 491, and Electrical Room E003A. The amendment introduces new equipment components such as gate valves, humidistats, motorized backdraft dampers, and revises existing system configurations to accommodate upgraded HVAC and medical equipment infrastructure.
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Columbia, MO RME Storage & ACA HVAC Upgrades Project No. 589A4-24-101 07/29/2025
Narrative of Changes – Amendment #1 Specifications
1. Section 232213:
a. Added gate valves.
b. Removed manual radiator/convector valves.
Drawings
1. Sheet GI104:
a. Revised to show construction/infection control barriers/anterooms and ICRA levels in Clean Storage 490 and adjacent Procedure Rooms 489 and 491, along with Corridor C496.
2. Sheet AC115:
a. Revised to show removal and replacement of the existing GWB ceiling in Clean Storage 490 and removal/reinstallation of suspended ceilings in Procedure Room 491 plus Corridor C496 to allow for duct removal/installation along with air terminal unit work.
3. Sheet AE101:
a. Revised room E003A naming to “Electrical Room”.
b. Removed grayscale shading and added notes indicating Rooms E003 & E003A are part of the scope of work.
c. Added notes calling for relocation of existing wall-mounted fire extinguisher and bracket in E003 adjacent to the new steam generator location.
d. Added notes calling for a wall-mounted door stop/bumper on side of the new steam generator housekeeping pad for the double door at Electrical Room E003A.
e. Added notes calling for the partial removal and reinstallation of guard railing for MEP work.
f. Added Detail 2/AE101 with photo and notes relocation to relocation of fire extinguisher and installation of a door bumper/stop on the side of the new steam generator housekeeping pad for the double door at Electrical Room E003A.
4. Sheet AE307:
a. Revised enlarged plans F1 and F3 to show work in the area of Clean Room 490 and to add notes related to tasks in this area. Note that the keynotes for ceilings and ICRA have been updated with information related to work around Room 490.
5. Sheet SS104:
a. Revised room E003A naming to “Electrical Room”.
b. Revised Steam Generator Housekeeping Pad layout/dimensions.
c. Revised detail callouts for equipment pad details to 3/SS601.
6. Sheet MH001:
a. Added Mechanical Notes #11, 12, & 13.
b. Added humidistat symbols.
7. Sheet MHD201:
a. Revised keynotes #1, 2, & 6.
b. Added keynotes #9 & 10.
c. Added existing emergency bypass dampers for ACA-AHU-4.
d. Revised extent of outside air duct demolition.
e. Revised location of existing duct-mounted humidifier.
f. Added various existing thermostats.
8. Sheet MH201:
a. Revised keynotes 1, 2, & 8.
b. Added keynotes 10 & 11.
c. Added existing emergency bypass dampers for ACA-AHU-4.
d. Revised extent of outside air duct replacement.
e. Added various existing thermostats.
9. Sheet MH205:
a. Revised the location and size of H-2 and associated duct.
b. Added duct-mounted humidistat.
c. Added section cut 2/MH301.
d. Revised size of H-3 and associated duct.
10. Sheet MH206:
a. Revised keynote #7
b. Deleted keynote #9.
11. Sheet MH207:
a. Revised keynotes 1 & 2.
b. Revised VAV 13-7 to remain.
c. Added keynote 1 to demolition plan.
12. Sheet MH209:
a. Revised keynotes #3, 4, 5, 7, 8, & 10.
b. Deleted keynote #9.
c. Revised tags that were erroneously shown as existing to remain.
d. Revised Room F135 duct routing.
13. Sheet MH210:
a. Revised keynotes #3 & 7.
b. Revised Room G108 return grille airflow.
14. Sheet MH212:
a. Revised keynotes #2, 6, 7, 8, 9, & 10.
15. Sheet MH213:
a. Revised keynotes #1, 2, 5, & 9.
b. Revised demolition work in Room F236.
16. Sheet MH214:
a. Revised keynote #7.
b. Added keynote #18.
17. Sheet MH215:
a. Revised keynotes #3 and 7.
b. Added new keynote #9.
c. Revised airflows associated with keynotes 10, 11, 12, 13, 14, & 15.
18. Sheet MH216:
a. Revised scope to replace terminal unit and ductwork serving Room 490.
19. Sheet MH301:
a. Added keynote #2.
b. Added detail #2.
c. Revised duct size for H-2.
20. Sheet MH401:
a. Added motorized backdraft damper at supply air discharge of ACA-AHU-1, 2, 3.
b. Added max/min outside air connections on ACA-AHU-4.
c. Deleted detail #7.
21. Sheet MH501:
a. Revised AHU Schedule note #5.
b. Added AHU Schedule notes #13 & 14.
c. Revised AHU Schedule humidifiers and heating coils.
d. Revised ACA-AHU-4 heating coil and cooling coil to handle 100% outside air during emergency operation.
e. Revised Steam Humidifier Dispersion Grid Schedule.
f. Added RG-1.
g. Revised Duct Pressure Class Schedule.
h. Deleted 1-TU-AHUS13-1.
i. Revised 3-TU-AHU31-1 airflow.
j. Revised name of terminal unit serving Room E148
k. Revised Air Balance Schedule airflows for Room G108 and 490.
22. Sheet MH502:
a. Revised (E)1-T2.04 airflow.
b. Revised Room F236 and F237 terminal unit tags.
c. Deleted existing fan terminal units, unit heaters, and fin tube radiators that do not exist.
d. Added existing Terminal Unit Schedule for RME Storage spaces.
e. Deleted terminal units that do not serve the ACA and will not remain from the existing ACA Terminal Unit Schedule.
23. Sheet MH701:
a. Revised control diagram as shown.
b. Revised sequence of operation as shown.
c. Added existing emergency changeover dampers.
d. Added backdraft dampers.
24. Sheet MH702:
a. Revised symbols to align with controls legend.
b. Added humidistats to detail #3.
c. Added points list as detail #5.
d. Added VFDs to heating water control diagram in detail #4.
e. Revised heating water system sequence of operations.
25. Sheet MH704:
a. Added 1-TU-ACAAHU1,2,3-22 to riser diagram.
26. Sheet MH705:
a. Added note saying sheet is for reference only.
27. Sheet MH706:
a. Added note saying sheet is for reference only.
28. Sheet MP001:
a. Issued sheet in its entirety.
29. Sheet MPD202:
a. Revised extent of piping demolition.
b. Added existing unit heaters.
c. Added various existing thermostats.
30. Sheet MPD203:
a. Revised extent of piping demolition.
b. Revised keynote wording.
31. Sheet MPD204:
a. Revised extent of piping demolition.
b. Revised keynote wording.
32. Sheet MPD205:
a. Revised extent of piping demolition.
b. Revised keynote wording.
33. Sheet MPD206:
a. Revised keynote #1.
34. Sheet MPD209:
a. Deleted keynote #2.
35. Sheet MP202:
a. Revised extent of new piping.
b. Added existing unit heaters.
c. Added various existing thermostats.
36. Sheet MP203:
a. Revised extent of new piping.
b. Added keynote #1.
37. Sheet MP204:
a. Revised extent of new piping.
b. Added keynotes #4 & 5.
c. Added steam generator relief vent piping.
d. Added ACA-AHU4-P-1.
38. Sheet MP205:
a. Revised extent of new piping.
b. Added keynotes #4 & 5.
c. Added steam generator relief vent piping.
39. Sheet MP206:
a. Revised extent of new piping.
b. Added keynotes #4 & 5.
c. Added steam generator relief vent piping.
40. Sheet MP207:
a. Added keynote #2.
b. Added pipe slope arrows.
c. Added steam generator relief vent piping.
41. Sheet MP208:
a. Added keynote #2.
b. Added pipe slope arrows.
c. Added steam generator relief vent piping.
42. Sheet MP209:
a. Revised keynote #1.
43. Sheet MP210:
a. Added keynote #5.
b. Added pipe slope arrows.
c. Added new humidistat.
d. Added clean steam condensate piping.
44. Sheet MP211:
a. Revised keynotes #1, 3, & 4.
b. Added pipe slope arrows.
c. Added clean steam condensate piping.
d. Added steam generator relief vent piping.
45. Sheet MP301:
a. Revised piping and duct layout.
b. Revised HX and HWP equipment tagging.
46. Sheet MP401:
a. Revised relief vent termination location in detail #4.
b. Added balancing valve in detail #6.
c. Revised detail #8.
d. Revised detail #9 to be detail #10.
e. Added new details #9, 11, & 12.
47. Sheet MP501:
a. Revised Pump Schedule. Added new pump ACA-AHU4-P-1.
b. Added new note #2 to Shell & Tube HX Schedule.
c. Revised Unfired Clean Steam-to-Steam Generator Schedule.
d. Deleted duplicate ACA-CP-1.
e. Revised Expansion Tank Schedule.
48. Sheet MP601:
a. Revised layout of flow diagram as shown.
b. Added heating water taps for future extension to ACA-AHU-6.
49. Sheet MP602:
a. Revised layout of flow diagram as shown.
b. Added heating water taps for future extension to ACA-AHU-6.
50. Sheet MP603:
a. Revised layout of flow diagram as shown.
b. Added heating water taps for future extension to ACA-AHU-6.
51. Sheet MP604:
a. Revised layout of flow diagram as shown.
b. Deleted duplicate keynote #5.
52. Sheet MP605:
a. Revised layout of flow diagram as shown.
b. Deleted duplicate keynote #5.
53. Sheet MP606:
a. Revised layout of flow diagram as shown.
b. Deleted duplicate keynote #5.
54. Sheet E001:
a. Added Electrical Note #14.
55. Sheet E201:
a. Added point of connection to in-line pump (ACA-AHU4-P-1).
b. Added wall-mounted disconnect switch to serve in-line pump.
c. Added keynotes #16 & 17.
56. Sheet E501:
a. Revised circuit to power in-line pump (ACA-AHU4-P-1).
b. Revised breaker and load of ACA-HWP-1,2.
c. Revised keynote #6 to reflect new work.
57. Sheet E502:
a. Added VFD schedule for ACA-HWP-1,2.
58. Sheet P001:
a. Revised sizes of RPBP-2 (REDUCED BACK FLOW PREVENTER), and PRV-1 (PRESSURE REDUCING VALVE) to 2” in the Plumbing Material List.
b. Added Plumbing Note #10.
59. Sheet P201:
a. Revised the make-up water pipe size to 2”.
b. Revised the drain piping from AHU’s.
60. Sheet P202:
a. Adjusted the condensate drain from the relocated H-2 location.
b. Updated detail cross-reference to 8/MP401.
61. Sheet P203:
a. Updated detail cross-reference to 8/MP401.
62. Sheet P401:
a. Updated detail #3.
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