Addendum 2 Specifictions Revisons write up.pdf

ADDENDUM

ADDENDUM NO. 02

September 22, 2020

PROJECT # 539-18-101

IMPROVE EXHAUST SYSTEMS

CINCINNATI VA MEDICAL CENTER

3200 VINE ST

CINCINNATI OH, 45220

LEVIN PORTER ASSOCIATES, INC

3011 NEWMARK DRIVE

MIAMISBURG, OHIO 45342

LPA PROJECT NO. 82146.00

TO ALL BIDDERS:

This addendum including all items listed hereinafter, shall become a part of the documents, shall be taken into account in preparing the proposal, and shall become a part of the contract. The work under each branch shall be in accordance with the original specifications unless excepted in this addendum, This addendum consists of 8 pages plus 29 (30”x42”) attachments for a total of 37 pages.

All changes to drawings shall be shown in clouded areas with an Amendment #1 triangle symbol:

ITEM NO. 1: THE SPECIFICATIONS SHALL BE REVISED AS FOLLOWS:

1.1 Reference: 01 00 00, GENERAL REQUIREMENTS

A. Revise paragraph (1.3-B-1) to delete Rooms A295 & A296 from BID ITEM 2, DEDUCT ALTERNATE 1.

1. Positive Pressure Rooms

A022C A022 C026 C028

C216L C225 C2021 C2033 C2025

C3017 C3014 C3034 A397 A476

A5093 A537C A537D A537E A551 A555 A557A A557C A557D

A724 A846A A849 A558

1.2 Reference: 07 22 00, ROOF AND DECK INSULATION

A. Revise paragraph (2.4 and 2.5) to read as follows

2.4 ROOF AND DECK INSULATION

A. Roof and Deck Insulation, General: Preformed roof insulation boards approved by roofing manufacturer.

B. Polyisocyanurate Board Insulation: ASTM C1289, Type II, Class 1, Grade 2, faced with glass fiber reinforced cellulosic felt facers on both major surfaces of the core foam.

C. Tapered Roof Insulation System:

1. Fabricate of mineral fiberboard, polyisocyanurate, perlite board, or cellular glass.

Use only one insulation material for tapered sections. Use only factory-tapered insulation.

2. Cut to provide high and low points with crickets and slopes as shown.

3. Minimum thickness of tapered sections; 38 mm (1-1/2 inch).

4. Minimum slope 1/48 (1/4 inch per 12 inches).

2.5 INSULATION ACCESSORIES

A. Cants and Tapered Edge Strips:

1. Wood Cant Strips: Refer to Section 06 10 00, ROUGH CARPENTRY.

2. Insulation Cant Strips: ASTM C208, Type II, Grade 1, cellulosic-fiber insulation board.

3. Tapered Edge Strips: 1/12 (1 inch per 12 inches), from 0 mm (0 inches), 300 mm to 450 mm

(12 inches to 18 inches) wide.

a. Cellulosic Fiberboard: ASTM C208.

B. Vapor Retarder:

1. Asphalt-coated polyester/glass fiber/polyester laminated ply sheet, with the below minimum properties. ASTM D6162 or ASTM D 6163 Type III, Grade S ply sheets are also acceptable:

a. Tear Strength @ 77 deg F, ASTM D 4073-94: machine direction 210 lbf/in., cross machine direction 185 lb/in minimum.

b. Breaking Strength @ 77 deg F, ASTM D 146-97: machine direction 165 lb/in; cross direction 150 lb/in, minimum

C. Cover Board:

1. Glass-Mat, Water-Resistant Gypsum Roof Board: ASTM C1177/C1177M, 16 mm (5/8 inch) thick, factory primed.

1.3 Reference: 07 51 13.13 COLD-APPLIED BUILT-UP ASPHALT ROOFING

A. Revise paragraph (1.1A) to read as follows:

B. Revise paragraph 1.6 QUALITY ASSURANCE to read as follows:

C. Revise paragraph 2.3B to read as follows:

D. Revise paragraph 2.4 MEMBRANE AND SHEET MATERIALS to read as follows:

E. Revise paragraph 3.9 B to read as follows:

1.4 Reference: 23 34 00, HVAC

A. Add paragraph (2.9) to specify mixed flow inline fan.

ITEM NO. 2: THE DRAWINGS SHALL BE REVISED AS FOLLOWS:

2.1 Reference: Sheet A101 , FIRST FLOOR PLAN enlarged plan 30/A101

A. Add note requiring work associated with these isolation rooms to be performed early in construction. Refer to attached revised sheet.

2.2 Reference: Sheet A102B-, SECOND FLOOR PLANS enlarged plan 16/A102B

A. Delete enlarged plan 16/A102B and work associated with rooms A295 and A296 B. Revise Keynote #4 to read as follows:

“4. SEAL ALL EDGES OF CEILING TILE WITH CEILING GASKETING 1/4"X1/8"

OPEN CELL FOAM TAPE. INSTALL CONTINUOUSLY ALONG EXISTING

CEILING GRID FLANGE.”

2.3 Reference: Sheet A103, THIRD FLOOR PLANS

A. Revise Keynote #4 to read as follows:

“4. SEAL ALL EDGES OF CEILING TILE WITH CEILING GASKETING 1/4"X1/8"

OPEN CELL FOAM TAPE. INSTALL CONTINUOUSLY ALONG EXISTING

CEILING GRID FLANGE.”

2.4 Reference: Sheet A105-, FIFTH FLOOR PLANS enlarged plan 28/A105

A. Add note requiring work associated with these isolation rooms to be performed early in construction. Refer to attached revised sheet.

B. Add keynote # 2 and #4 –refer to attached revised sheet.

2.5 Reference: Sheet A130-, ROOF PLAN

A. Revise note for simplex plume fan curbs to require removal of existing curbs and installation of new curbs by fan manufacturer. Refer to attached revised sheet.

B. Added BUR to legend and to roof plan locations indicating built up roof. Refer to attached revised sheet.

C. Revised keynotes to maintain existing roof integrity. Refer to attached revised sheet.

2.6 Reference: Sheet A601 , DOOR SCHEDULE

A. Delete three (3) doors associated with rooms: A295 CLEAN EQUIPMENT and A296 CI. SUPP.

2.7 Reference: Sheet S-M101, SITE PLAN – REMOVALS & NEW WORK

A. Delete crane for 1-DPF1, revise duplex plume fan tags. Refer to attached revised sheet.

2.8 Reference: Sheet 1-M1SB, SUB-BASEMENT FLOOR PLAN – REMOVALS & NEW WORK

A. Revise new exhaust fan 1-EF1 from vertical flow, floor mounted inline centrifugal type to horizontal flow, suspended inline mixed flow type. Add notes requiring removal of existing wall & door, and abandoned coil & associated piping. Refer to

2.9 Reference: Sheet 1-M101A, FIRST FLOOR PLAN AREA A – REMOVALS & NEW WORK

B. Delete new airflow control valve AV-A1006, revise references to 1-DPF1. Add note requiring work associated with these isolation rooms to be performed early in construction. Refer to attached revised sheet.

2.10 Reference: Sheet 1-M101C, FIRST FLOOR PLAN AREA C – REMOVALS & NEW WORK

A. Revise references to 1-DPF2. Refer to attached revised sheet.

2.11 Reference: Sheet 1-M102A, SECOND FLOOR PLAN AREA A – REMOVALS & NEW WORK

A. Revise references to EF-157E & EF-158E. Refer to attached revised sheet.

2.12 Reference: Sheet 1-M102B SECOND FLOOR PLAN AREA B – REMOVALS & NEW WORK

A. Revise Note 31 to require recertification of existing exhaust hood as part of TAB.

Refer to attached revised sheet.

2.13 Reference: Sheet 1-M102C, SECOND FLOOR PLAN AREA C – REMOVALS & NEW WORK

2.14 Reference: Sheet 1-M102D SECOND FLOOR PLAN AREA D – REMOVALS & NEW WORK

A. Clarifications to TAB work required in Rooms C211 & C212, including requirement for recertification of existing exhaust hoods. Refer to attached revised sheet.

B. Delete five (5) existing critical space monitors serving negative pressure rooms, and delete three (3) existing critical space monitors serving positive pressure rooms.

Refer to attached revised sheet.

2.15 Reference: Sheet 1-M103A THIRD FLOOR PLAN AREA A – REMOVALS & NEW WORK

A. Delete new airflow control valve AV-A1004, revise references to EF-157E & EF- 158E. Refer to attached revised sheet.

2.16 Reference: Sheet 1-M103C, THIRD FLOOR PLAN AREA C – REMOVALS & NEW WORK

2.17 Reference: Sheet 1-M104C, FOURTH FLOOR PLAN AREA C – REMOVALS & NEW WORK

A. Revise references to 1-DPF2, 1-PF2, 1-FF2. Refer to attached revised sheet.

2.18 Reference: Sheet 1-M104E PARTIAL ROOF PLANS – REMOVALS & NEW WORK

A. Delete all work associated with new exhaust fan 1-EF14 from project. Refer to

B. Revise note for simplex plume fan curbs to require removal of existing curbs and installation of new curbs by fan manufacturer. Refer to attached revised sheet.

2.19 Reference: Sheet 1-M105A FIFTH FLOOR PLAN AREA A – REMOVALS & NEW WORK

A. Delete new airflow control valves AV-A5088, AV-A5089, AV-A5091, AV-A5092.

Revise references to EF-118E, EF-119E, EF-120E, EF-121E, EF-157E & EF-158E.

Add note requiring work associated with these rooms to be performed early in construction. Refer to attached revised sheet.

2.20 Reference: Sheet 1-M105B FIFTH FLOOR PLAN AREA B – REMOVALS & NEW WORK

A. Delete TAB work in Rooms B526A & B526B, associated with 1-EF14. Refer to

2.21 Reference: Sheet 1-M106A SIXTH FLOOR PLAN AREA A – REMOVALS & NEW WORK

A. Delete all work associated with new duplex plume exhaust fan 1-DPF1 from project.

Delete removal of six existing exhaust fans from project – fans shall be existing to remain.

2.22 Reference: Sheet 1-M110 TENTH FLOOR PLAN – REMOVALS & NEW WORK

A. Revise note for simplex plume fan curb to require removal of existing curb and installation of new curb by fan manufacturer. Refer to attached revised sheet.

2.23 Reference: Sheet M601 SCHEDULES

A. Revise 1-EF1 to change fan type from inline centrifugal to inline mixed flow. Refer to

B. Revise 1-EF14 to show fan as existing to remain. Refer to attached revised sheet.

C. Add six existing isolation room fans to schedule, that were previously to be replaced by 1-DPF1. Refer to attached revised sheet.

D. Delete 1-DPF1 and associated footnotes from schedule, and revise tag for 1-DPF2 to 1-DPF1. Refer to attached revised sheet.

E. Add requirement for silencer nozzle to duplex plume fan footnote. Refer to attached revised sheet.

F. Delete curb adapter requirement for simplex plume fans. These fans shall be mounted on new curb furnished by fan manufacturer, per notes on floor plans. Refer to attached revised sheet.

2.24 Reference: Sheet M602 SCHEDULES, CONTROLS AND AUTOMATION

A. Revise fan and filter tags in ISOLATION ROOM AIRFLOW CONTROLS diagram and sequences. Refer to attached revised sheet.

B. Delete 1-PF1 & 1-FF1 and revise tags for 1-PF2 & 1-FF2 to 1-PF1 & 1-FF1. Refer to

C. Delete all airflow control valves that were previously associated with 1-DPF1. Refer

2.25 Reference: Sheet M701 CONTROLS AND AUTOMATION

A. Revise quantity of critical space monitors in CRITICAL SPACE MONITORING sequence. Refer to attached revised sheet.

B. Delete 1-EF14 control diagram and sequences. Refer to attached revised sheet.

2.26 Reference: Sheet E001, LEGEND, GENERAL NOTES AND SCHEDULES

A. MECHANICAL EQUIPMENT SCHEDULE: Deleted reference to 1-DPF2. Add Existing exhaust fans 1-EF94 thru 1-EF99. Refer to attached revised sheet.

2.27 Reference: Sheet 1-E1SB, SUB-BASEMENT FLOOR PLAN – REMOVALS AND NEW WORK

A. Include demolition of heat recovery coil pump electrical feed. Refer to attached revised sheet.

B. Add Plan Note 8. Refer to attached revised sheet.

2.28 Reference: Sheet 1-E103A, THIRD FLOOR PLAN AREA A – REMOVALS AND NEW WORK

A. Remove dashed starters in mechanical space referenced as serving fans (EF-118E), (EF-119E), (EF-120E) and (EF-121E). Refer to attached revised sheet.

B. Remove (2) NEMA size 2 starters in mechanical space with Note 9 reference. Refer to attached revised sheet

C. Delete Plan Note 9. Refer to attached revised sheet.

2.29 Reference: Sheet 1-E104C, FOURTH FLOOR PLAN AREA C – REMOVALS AND NEW WORK

A. Change third floor roof strobic fan reference from 1-DPF2 to 1-DPF1. Refer to

B. Revise Plan Notes 8, 21 and 25. Refer to attached revised sheet.

C. Revise Panel Schedule for EP4A (EXISTING) to change strobic fan reference in circuit positions 2,4,6 and 8,10,12 from 1-DPF2 to 1-DPF1. Refer to attached revised sheet.

D. Partial Mechanical Room A456E Plan: Revised starter reference for strobic fans 1- DPF2(A) and 1-DPF2(B) to 1-DPF1(A) and 1-DPF1(B). Refer to attached revised sheet.

2.30 Reference: Sheet 1-E106A, SIXTH FLOOR PLAN AREA A – REMOVALS AND NEW WORK

A. Strobic fan 1-DPF1 located on fifth floor roof is now deleted from the project. Refer

B. Six plume exhaust fans on fifth floor roof previously being removed will now be existing to remain. These existing to remain fans will now be numbered 1-EF94 thru 1-EF99. Refer to attached revised sheet.

C. Delete Plan Notes 4, 5, 7, 8, 9 and 10. Refer to attached revised sheet.

END OF ADDENDUM NO. 02