PURCHASING DEPARTMENT COLEEN CASELLA

Assistant Purchasing Agent for

Goods & Services

Elizabeth Unger NATALIE SULLIVAN Purchasing Agent Assistant Purchasing Agent for

Design & Construction

City of Cambridge

795 Massachusetts Avenue, Cambridge, Massachusetts 02139 Voice: 617-349-4310 Fax: 617-349-4008 TTY: 617.349.4242

TO: All Bidders

FROM: City of Cambridge

DATE: October 5, 2020

RE: File No. 9360 – DPW Mooney Street Alteration – Addendum No. 1

This addendum is comprised of:

1. Pre-bid sign in sheet (attached)

2. Changes to drawings

CHANGES TO DRAWINGS

Sheet AD-101 Demolition Floor Plan, RCP & Notes

Item 1: REPLACE sheet in its entirety. Changes include, but are not limited to:

(a) Demolition scope has changed; Some walls, openings and doors/frames that were

previously slated for demolition have changed. See rooms 205, 206, 208, 212, 213, 214,

215, 217/218.

(b) Door and frames associated with those walls have changed.

(c) Finishes in Rooms 213 and 214.

(d) All room numbers have been changed to reflect room changes.

Sheet A-101 Proposed Floor Plan, RCP, Furniture Plan, Notes and Finish Schedule

Item 1: REPLACE sheet in its entirety. Changes include, but are not limited to:

(a) All room/door numbers have been changed to reflect room changes.

(b) Some walls that were previously slated for demolition will remain.

(c) New walls have been added in Room 209/209A and 214.

(d) Room 205: New infill at door/frame #205 to reflect move of door #205 to opening for

door # 205A.

(e) Door Schedule has been updated to reflect doors that will remain, doors that are

slated for reuse and new doors.

(f) Finishes in Rooms 213 and 214 have changed.

(g) New General Notes section and imagery have been added

(h) Locations of Wireless access points have been added to the RCP

(i) Location of Telecommunications have been added to furniture plan

(j) Locations and number of lockers on furniture plan have been added

795 Massachusetts Avenue, Cambridge, Massachusetts 02139 Voice: 617-349-4310 Fax: 617-349-4008 TTY: 617.349.4242

Sheet FP0.1 Floor Plan – Fire Protection

Item 1: REPLACE sheet in its entirety. Changes include, but are not limited to:

(a) Revised locations for sprinkler heads to reflect wall changes.

(b) Other items as noted.

ATTACHMENTS

Sheet AD-101 Demolition Floor Plan, RCP & Notes

Sheet A-101 Proposed Floor Plan, RCP, Furniture Plan, Notes and Finish Schedule

Sheet FP0.1 Floor Plan – Fire Protection

All other details remain the same.

Elizabeth Unger

Purchasing Agent

Addendum No. 1

SECOND FLOOR PLAN - FIRE PROTECTION

SCALE: 3/16" = 1' - 0"

EXISTING UPRIGHT SPRINKLER

SYSTEM ABOVE SUSPENDED CEILING

SHALL REMAIN IN OPERATION.

F

EX. 6" FIRE SERVICE

EX. FIRE DEPT.

CONNECTION

EX. 6" D.C.V.A.

EX. 6" SP. RISE

EX. 4"

EX. CHECK VALVE

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

EX. 4" SP. MAIN

FOLLOWING SLOPE

OF ROOF

EX. SWING JOINT

EX. 4" SP. MAIN

FOLLOWING SLOPE

OF ROOF

SP SP SP SP

SP SP SP SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP

SP SP

3"

3" 3"3"

EX. SPRINKLER SYSTEM

TO REMAIN ACTIVE

DESIGN WORK AREA

AS LIGHT HAZARD

SP

CUT IN NEW 3" SP. INTO EX. BRANCH LINE

COORDINATE SYSTEM SHUTDOWN w/BUILDING

RUN SPRINKLER DRAIN

TO EXTERIOR OF BLDG

NEW SPRINKLER CONTROL

VALVE FOR SECOND FLR.

T

F

WITH TAMPER & FLOW SWITCH

OWNER. ONCE CUT IN IS COMPLETE

EXISTING SPRINKLER SYSTEM

SHALL BE REACTIVATED & OPERATIONAL

TYP. SEMI-RECESSED PENDENT

SPRINKLER HEAD IN ACT CEILING

3"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"1

-1

/4

"

1-1

/4

"1

-1

/4

"

1-1

/4

"1

-1

/4

"

1-1

/4

"1

-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"1

-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"1

-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

1-1

/4

"

SP

1-1

/4

"1

-1

/4

"

IT RM

223

TOILET

220

TOILET

221

OFFICE

219

OFFICE

217

LOCKER RM

2

215

KITCHENETTE

214

OFFICE

212

STAIR 1

ST1

OFFICE

211

STORAGE

210

CORR

203

CORR

202

OFFICE

209

OFFICE

208

OFFICE

207

OFFICE

206

OFFICE

205

OFFICE

204

CORR

201

COPIER

222

ETR

CPT

VCT

CPT

CPT

STAIR 2

ST2

ETR

ETR

LOCKER RM

1

213

OFFICE

216

LOCKER

RM 3

218

OFFICE

209A

DISHARGE DRAIN

AT 18" ABV. FIN. GRADE

1

City of Cam

bridge

Mooney St. O

ffice Plan

Consultants

Registrations

Number Revision Date

24 Roland Street, Ste. 301Charlestown, MA 02129T: 617.776.6545F: 617.776.6678www.hktarchitects.com

Drawing number

Drawing set

Job number

Date

Checked byDrawn by

Draw

ing

Title

21941

GGD CMG

SEPT 10, 2020

GARCIA GALUSKA DESOUSA

1 Addendum 1 10-02-2020

FL

OO

R P

LA

N - F

IR

E P

RO

TE

CT

IO

N

FP0.1

GENERAL NOTES

THE WORK HEREIN REQUIRED INCLUDES A HYDRAULICALLY DESIGNED SPRINKLER SYSTEM AS SPECIFIED

IN THE DOCUMENTS AND AS APPROVED BY THE ARCHITECT.

THE FIRE PROTECTION DRAWINGS ARE DIAGRAMMATIC AND ARE TO BE USED FOR THE PURPOSE OF

ESTABLISHING GENERAL LOCATIONS OF PIPING RUNS, SIZES OF PIPING, AND QUANTITIES OF FIXTURES

AND EQUIPMENT TO BE FURNISHED HEREIN. REFER TO ARCHITECTURAL DRAWINGS FOR DIMENSIONS

FOR EXACT LOCATIONS OF ALL SPRINKLER HEADS, AND EQUIPMENT, INCLUDING MOUNTING HEIGHTS. IN

THE EVENT OF CONFLICT OR IF DIMENSIONS ARE NOT SHOWN, OBTAIN FIELD DIRECTIVE FROM THE

ARCHITECT AS TO THE LOCATIONS OF ALL VISIBLE EQUIPMENT.

ALL PIPING SHOWN ON THESE PLANS OR THOSE TO BE DESIGNED HEREIN SHALL BE RUN CONCEALED

ABOVE SUSPENDED CEILINGS, IN CHASES, OR IN PARTITIONS UNLESS SPECIFICALLY NOTED OTHERWISE.

ALL SPRINKLER HEADS IN CEILING TILES SHALL BE LOCATED IN THE EXACT CENTER OF TILE UNLESS

SPECIFICALLY APPROVED OTHERWISE BY THE ARCHITECT.

REFER TO ARCHITECTURAL REFLECTED CEILING PLANS FOR CEILING HEIGHTS AND CEILING MATERIALS

AND LAYOUTS. IN THE EVENT OF CONFLICT OR IF DIMENSIONS ARE NOT SHOWN, OBTAIN FIELD

DIRECTIVE FROM THE ARCHITECT AS TO THE LOCATIONS OF ALL VISIBLE EQUIPMENT.

ATTENTION IS CALLED TO THE REQUIREMENT FOR THE PREPARATION OF COORDINATION DRAWINGS. IN

ADDITION TO THE PREPARATION OF SHOP DRAWINGS ALSO PREPARE COORDINATION DRAWINGS AS

OUTLINED IN THE SPECIFICATION. THE APPROVAL OF THE SHOP DRAWINGS INCLUDING DIMENSIONS

SHOWN THEREIN DOES NOT RELIEVE THE CONTRACTOR.

SPECIFIC ATTENTION IS DIRECTED TO THE REQUIREMENTS OF STATE BUILDING CODE AND NFPA 241

REGARDING THE MAINTENANCE OF FIRE PROTECTION SYSTEMS. MAINTAIN THE SYSTEMS AS REQUIRED

BY THESE STANDARDS AS A MINIMUM.

REFER TO NFPA 13 TABLE 8.3.2.5(a) FOR TEMPERATURE RATING OF SPRINKLERS BASED ON DISTANCE

FROM HEAT SOURCES SUCH AS HEATING DUCTS, DIFFUSERS AND UNIT HEATERS.

1.

2.

3.

4.

5.

6.

7.

8.

UL/FM HANGER ASSEMBLY

FROM STRUCTURE

HANGER ROD SUPPORTED

PIPE

EXTEND HANGER ROD

ADJUSTABLE SWIVEL RING

TIGHT TO PIPE

ALTERNATE: USE UL/FM

SURGE SUPPRESSOR CLIPS

NOTE: TO BE USED AT ALL END-OF-LINE BRANCH

HANGERS THROUGHOUT PROJECT

TYPICAL END-OF-LINE BRANCH

PIPE HANGER DETAIL

N.T.S.

1

LEGEND

NOTE: NOT ALL SYMBOLS LISTED ARE APPLICABLE TO THIS PROJECT.

HEAT, VENT & AIR CONDITIONER. CONTRACTOR

DOUBLE CHECK VALVE ASSEMBLY

PRE-ACTION

SPRINKLER FLOOR CONTROL VALVE ASSEMBLY

EXP

SCVA

FDVC

FHC

FDV

LPD

HVAC

DCVA

EC

PA

GC

@C

AP

AFF

PC

F&I

EXPOSED

FIRE HOSE CABINET

FIRE DEPT. VALVE CABINET

FIRE DEPARTMENT VALVE

NO AUTOMATIC SPRINKLERS

LOW POINT DRAIN

EXPOSED AT CEILING

FURNISH AND INSTALL

ABOVE FINISHED FLOOR

GENERAL CONTRACTOR

PLUMBING CONTRACTOR

ELECTRICAL CONTRACTOR

ACCESS PANEL

FIRE DEPARTMENT CONNECTION (STORZ)

EXPOSED UPRIGHT SPRINKLER HEAD

WMG

AC

TYP.

PIV

ABD

VIV

FS

FDC

CV

SCV

PG

DP,DN

UP

CONCEALED ABOVE CEILING

SUPERVISED CONTROL VALVE

VALVE ON VERTICAL

WATER MOTOR GONG

AUTOMATIC BALL DRIP

POST INDICATOR VALVE

TYPICAL

CHECK VALVE

FLOW SWITCH

PRESSURE GAGE

PIPE RISE OR UP

TEE LOOKING DOWN

PIPE DROP OR DOWN

CAP ON END OF PIPE

STRAINER

UNION

ABBREV

SYMBOL

SP

F

SP

F

PENDANT SPRINKLER HEAD

SIDEWALL SPRINKLER HEAD

DESCRIPTION

SPRINKLER LINE (WET)

FIRE MAIN UNDERGROUND

FIRE PROTECTION CONTRACTORFPC

SDSD SPRINKLER DRAIN

PRESSURE RELIEF VALVE

ITS

REMOTE INSPECTORS TEST STATION

ITC INSPECTORS TEST CONNECTION

SLOPED PIPE

MAIN WET ALARM CHECK VALVEMACV

F F FIRE MAIN ABOVEGROUND

TAMPER (SUPERVISORY) SWITCH

TS

FLOW SWITCH

FS

T

F

18"

MIN

.

FINISH GRADE

FINISH FLOOR

PIPE HANGER SUPPORTED

EXTERIOR WALL

WATER TIGHT

SLEEVE

1" GALVANIZED

PIPE THRU WALL

W/ 45° ELBOW &

BUG SCREEN

SPRINKLER DRAIN

PIPING SCHEMATIC

N.T.S.

FURNISH & INSTALL 2' X 3'

CONCRETE SPLASH PAD

3

FIRE PROTECTION CONTRACTOR IS TO

PROTECT ALL SURFACES DURING

TESTING, ETC. ALL DAMAGE TO

EXISTING FINISHES IS TO BE

REPAIRED AT NO ADDITIONAL COST

TO OWNER.

NOTE:

FP0.1

FP0.1

GWB GYPSUM WALL BOARD

IDENTIFICATION SIGN

INSPECTOR'S TEST STATION PIPING SCHEMATIC

U.L. LISTED COMBINATION

UNION

2" DRAIN RISER BY FIRE PROTECTION CONTR.

THROUGH EXTERIOR WALL AS DETAILED ON THE

COMBINATION F/SP. STANDPIPE

UL/FM INDICATING TYPE CONTROL VALVE

PRESSURE GAUGE WITH COCK

TO SPRINKLER SYSTEM

WATERFLOW SWITCH

5

3

4

1

2

9

8

6

7

7

9

1

2

4

3

UL/FM CHECK VALVE10

10

5

6

1" DRAIN LINE

TEST DRAIN, AUX. DRAIN,

8

AND SIGHT GLASS

11

11 3/4" RELIEF VALVE PROVIDE

ON ASSEMBLIES WITH PRESSURE

REDUCING & CHECK VALVES

ASSEMBLY (SCVA) DETAIL

N.T.S.

FP0.1

2

SPRINKLER CONTROL VALVE DETAIL

9. THE FIRE PROTECTION CONTRACTOR SHALL COORDINATE WITH THE OWNER AND THE OWNER'S

REPRESENTATIVE ALL NECESSARY INTERRUPTIONS OF SERVICE TO THE TENANTS. CONTRACTOR SHALL

SCHEDULE AND PERFORM THE WORK SO AS TO MINIMIZE DISRUPTIONS TO THE OCCUPANTS. ANY WORK

NECESSARY THAT IN THE OPINION OF THE OWNER IS DEEMED TO BE DISRUPTIVE TO THE TENANTS

SHALL BE PERFORMED DURING NON BUSINESS HOURS.

10. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ALL TEMPORARY SPRINKLER INSTALLATION

REQUIREMENTS NECESSARY TO ACCOMMODATE THE PHASING OF THE WORK DURING THE CONSTRUCTION

PERIOD. HE SHALL BE FURTHER RESPONSIBLE FOR ANY AND ALL REQUIRED FIRE DEPARTMENT DETAILS

DEEMED NECESSARY TO COMPLETE THE WORK.

11. THE SPRINKLER CONTRACTOR SHALL BE RESPONSIBLE FOR PLACING THE SPRINKLER SYSTEM BACK

ON LINE AND OPERATIONAL AT THE END OF EACH WORKING DAY.

FROM EXISTING BLDG STRUCTURE

FIRE PROTECTION CRITERIA

1. THE PURPOSE OF THE FIRE PROTECTION DRAWINGS AND SPECIFICATIONS IS TO ESTABLISH THE

CRITERIA FOR DESIGN, MATERIALS, AND LOCATIONS OF THE COMPLETE SPRINKLER SYSTEM. THE FIRE

PROTECTION SUB-CONTRACTOR IS RESPONSIBLE FOR THE FINAL DESIGN OF THE SPRINKLER SYSTEM

AND SAID DESIGN AND INSTALLATION SHALL INCLUDE ALL COMPONENTS TO PROVIDE FOR THE

COMPLETE SYSTEM WITHOUT ANY ADDITIONAL EXPENSE TO THE OWNER. THE SUB-CONTRACTOR

SHALL VERIFY THAT THE NUMBER OF HEADS SHOWN ON HIS WORKING PLANS AND HYDRAULIC

CALCULATIONS ARE ADEQUATE TO PROTECT ALL AREAS OF THE BUILDING AND SHALL INCLUDE ANY

COST FOR ADDITIONAL SPRINKLER HEADS AND PIPING NOT SHOWN ON THESE DRAWINGS IN HIS

CONTRACT PRICE.

2. THE WORK AREA IS TO BE 100% SPRINKLERED INCLUDING ALL CLOSETS AND ELECTRIC ROOMS.

3. THE BUILDING IS GENERALLY STEEL CONSTRUCTION. THE BUILDING IS PROTECTED WITH AN

AUTOMATIC SPRINKLER SYSTEM. CONTRACTOR SHALL CONNECT TO EXISTING SYSTEM AND INSTALL

NEW PENDENT SPRINKLER IN THE RENOVATED CEILINGS. THE WORK AREA SHALL BE PROTECTED

THROUGHOUT WITH A WET TYPE SPRINKLER SYSTEM AND THE HEADS LOCATED WHERE SHOWN.

4. PROVIDE COMPLETE HYDRAULIC CALCULATIONS AND DISTRIBUTION SYSTEM DESIGN UTILIZING THE

DESIGN CRITERIA ESTABLISHED ON THE CONTRACT DOCUMENTS. SYSTEM DESIGN SHALL BE BASED ON

FLOW TEST PERFORMED BY THIS CONTRACTOR.

5. REQUIRED DESIGN FLOWS:

A. DESIGN HAZARDS = LIGHT HAZARD

B. REQUIRED DESIGN DENSITIES = 0.10 GPM OVER 1,500 S.F.

6. SPRINKLER SPACING (MAX.) = 225 S.F.

7. FOLLOW THE HEAD LAYOUTS SHOWN ON THE DRAWINGS IN FINISHED AREAS. ALL SPRINKLER HEADS

SHALL BE LOCATED CENTER ON THE CEILING TILE AND SWING JOINTS IF REQUIRED MAY BE USED TO

MEET THIS REQUIREMENT.

8. HYDRAULIC CALCULATIONS FOR THE SYSTEM SHALL INCLUDE A 10 PSI CUSHION AND SHALL LIMIT

WATER FLOW VELOCITY TO A MAXIMUM OF 20 FT./SEC.