BOSTON-A-1.pdf

July 27, 2026

Proposal No. 616454-134457

ADDENDUM NO. 1

To Prospective Bidders and Others on:

BOSTON

COOLING TOWER REPLACEMENTS AT HAYMARKET CENER

SUB-BIDS TO BE OPENED AND READ: JULY 27, 2026 @ 2:00 P.M.

GENERAL BIDS TO BE OPENED AND READ: AUGUST 5, 2026 @ 2:00 P.M.

Transmitting changes to the Contract Documents as follows:

RESPONSES TO BIDDERS’ QUESTIONS

6 pages

DOCUMENT 007150

Revised pages 230000- 15…..to be included in Future Addendum.

DRAWING REVISIONS

Revised Plan Sheet M-000 to be included in Future Addendum.

Please take note of the above and acknowledge Addendum No. 1 in your Proposal file before submitting your bid.

Massachusetts Department of Transportation Property Services

ADDENDUM NO. 1 JULY 27,2026

RESPONSES TO BIDDERS’ QUESTIONS

Questions from. J.C.Cannistraro LLC Dated July 21, 2026 @ 12:29 PMn and July 22,2026

Question 1.) Cooling Tower Springs. Are we quoting to replace the springs on the two cooling towers?

Response 1.). Yes, existing vibration isolators shall be replaced with new. The existing galvanized steel frame that is above the vibration isolators shall remain and be reused.

Keyed Note #2 on Drawing M000 shall be revised to read as follows:

"2. MOUNT COOLING TOWER ON THE EXISTING STEEL DUNNAGE WITH NEW

VIBRATION ISOLATION. CONTRACTOR TO COORDINATE SUPPORTING

EQUIPMENT IN ACCORDANCE WITH COOLING TOWER MANUFACTURER

REQUIREMENTS (TYP. 2)."

Document 007150 Specification Section 230000-2.13-E.2 shall be revised to read as follows:

"2. The tower shall be structurally capable of being supported at the four outer corners of the tower cell. Tower(s) shall be installed on new spring vibration isolators at each corner."

Please note that per Specification Section 230000-2.13-A. "If the contractor selects a different manufacturer, they will be responsible for providing any required structural modifications."

Question 2.) BMS Integration. Is BMS integration supposed to be included?

Response 2.). Yes, BMS integration shall be included per Specification Section 230000-2.22.

Question 3.) Pricing. Should the AHU and exhaust fan install total be lumped in with the cooling tower replacement total price or would you like them separated?

Response 3.) The AHU and Exhaust fan scope of work is not required to be separated for purposes of the General Bid.

Questions from. Enterprise Equipment Co., Inc. Dated July 23, 2026 @ 7:57 AM

Question 4.) Permits. Confirm that a State Building Permit and State Plumbing Permit will be required and that fees are not waived.

Response 4.) Confirmed

Question 5.) Confirm that temporary office trailer is not required for this project.

Response 5.) Assume not required. Contractors may use all areas of the 5th Floor Mechanical Room as

Office/meeting space. Egress shall be maintained to the two egress doors as shown on the Life Safety Plan on G002.

Question 6.) RiggingConfirm the intent is for both rigging operations (as one tower needs to remain online) to take place on Sundays.

Response 6.) This is a contractor’s means and methods decision. It appears that Sunday is preferable, but not required contingent on the following:

a. Official approval is received and coordinated with the City of Boston and the

MBTA. (Though MBTA is attached to building, MassDOT does not oversee any of their operations)

b. Does not disrupt RMV regular operations.

c. Keep in mind that the Outdoor Market run by the Haymarket Pushcart

Association uses Hanover Street Fridays & Saturdays.

Question 7.) Confirm that a MEC coordinator is not a requirement of this project, due to the small scope and nature of work.

Response 7.) MEC Coordinator is not required. HVAC Contractor is the Prime Contractor and shall be responsible for coordination of all trades on this project.

Question 8.) Will full commissioning be executed in phases or after the second tower is installed?

Response 8.) Commissioning should take place once the full system, including both new towers are operational.

Question 9.) Will water balancing be executed in phases or after the second tower is installed?

Response 9.) Water balancing should take place once the full system, including both towers are operational..

Question 10.) Is pre-demolition water balancing a requirement for this project?

Response 10.) Pre-demolition water balancing is not required. .

Question 11) The new drain lines are no-hub cast iron. Please confirm insulation thickness and jacket requirements.

Response11.) Drain lines shall be insulated with 2" thick fiberglass insulation with an all service jacket and vapor barrier..

Question 12.) Will heat tracing be required on the drain line replacement? If so, please indicate scope and sequence.

Response 12.) Existing heat tracing on the drain lines shall be removed and reinstalled. New heat tracing is not required..

Question 13.) Will heat tracing be required on the existing/new condenser water and equalizer piping? If so, please indicate scope and sequence.

Response 13.) Heat tracing is not required..

Question 14.) Much of the pipe is existing to remain. Is all existing exposed insulation to be removed and replaced? Or just new insulation on new pipe?

Response 14.) All new piping and any existing pipe insulation that gets disturbed as part of the project shall be have new insulation..

Question 15.) Confirm that new insulation shall be aluminum jacket with PVC fittings to match existing conditions.

Response 15.) All new pipe insulation located outside of the building shall be provided with aluminum pipe jacket.

Question 16.) Confirm that the “Intake Duct Installation Detail” on M000 also applies to the Exhaust Duct with relation to the existing louver.

Response 16.) Confirmed. Detail applies to the exhaust duct and louver.

Question 17.) Confirm that existing hangers/supports can be reused at tower locations, if feasible.

Response 17.) New hangers shall be provided for all new piping. Existing hangers can be reused for existing piping..

Question 18.) Confirm, for bidding purposes, that the concrete surrounding the existing roof drains will not need to be chipped out in order to replace the drains.

Response 18.) We anticipate some chipping of the existing concrete topping slab will need to occur to physically remove the existing drains. For bidding purposes, assume the following for repair around each floor drain:

a. Two square feet of concrete topping repair at 4" thickness.

b. #3 dowel bar @ 12" o.c. set in epoxy with 3" embedment, typ.

c. New epoxy coating with 6" lap over existing coating, typ..

Question 19.) Confirm that epoxy floor painting replacement (below cooling towers) is not in the scope of work.

Response 19.) Confirmed. Existing epoxy floor coating shall remain. .

Question 20.) Does the new equalizer pipe require flex connectors at each tower connection?

Response 20.) Flexible connections shall be provided for the equalizer piping at each tower connection.

Question 21.) Confirm the intent is to replace the existing control valves with similar in-kind butterfly style.

Response 21.) New control valves shall be as noted in the specifications. Butterfly valves are acceptable.

Question 22.) At the pre-bid walk, there was discussion about replacing the vibration springs with new (x4 per tower). Please confirm.

Response 22.) Refer to response to Question #1.

Question 23.) Confirm that the new cement plaster shall be painted to match existing conditions.

Response 23) Confirmed per 1/A101. .

Question 24.) Are the new cement ceiling access panels to be fire-rated and keyed?

Response 24.) Yes, new access panels shall be fire-rated and keyed.

Refer to Code Summary on G002 under Fire Resistance Rating Requirements for hourly rating of floor ceiling assembly. .

Question 25.) Are temporary toilet facilities required for this project?

Response25.) No, there will be one bathroom in the garage offered for use..

Question 26.) Per the details, there appear to be existing 1” taps with isolation valves for the new AHU- 1 piping. Please confirm. If valves do not exist, can the 3” be locally isolated and drained in order for taps to be installed?

Response26.) There are two ball valves on the two existing taps..

Question 27.) Confirm that water treatment is limited to flushing new pipe and that the owner’s existing water treatment service contractor will provide chemicals and analysis/monitoring as required.

Response27.) Water treatment is limited flushing and treating the new piping and new towers. This contractor is responsible for providing a water analysis and required chemicals for this portion of the system only. Contractor to coordinate with the building's water treatment contractor to ensure chemicals are compatible.

Question 28.) Confirm that a passivation process is not required due to the stainless-steel construction of the towers.

Response28.) Passivation process is not required unless it is a requirement of the tower manufacturer..