Section 2.2, Traffic Signal Heads, amend to include the following:
Signal heads shall be rigid mounted on mast arms, with the bottom of all signals at the same height. All traffic signal
ienses shall be 12” in diameter uniess otherwise noied on the plans.
Signal heads shall be made of aluminum and conform to Materials Section 2.2 of Section 616 of the NHDOT Standard
Specifications.
Section 2.4.1.2; revise in its entirety to read as follows:
2.4.1.2 Concrete foundation shall be concrete Class B meeting the requirements of Section 520. Reinforcing steel
shall meet the requirements of Section 544. The mast arm foundation can be either a spread footing or cored
pier footing as described in further detail in the geotechnical evaluation memo provided with these Contract
Documents.
Construction Requirements Add the
following subsections to Section 3.1 to read as follows:
3.1.3. No work shall be commenced by the Contractor until approval of the shop drawings and the manufacturer's
data has been received in writing from the Engineer. Approval of these drawings shall be general in character and
shall not relieve the Contractor from the responsibility of, or the necessity of, furnishing materials and workmanship
conforming to the plans and specifications.
3.1.4 The Contractor shall deliver to the Engineer a certificate of compliance with the manufacturer for all
materials purchased from the manufacturer.
3.1.5 The Contractor shall obtain an electrical permit from the City of Nashua and/or the NHDOT prior to
construction. The Contractor shall notify the City of Nashua and/or the NHDOT 15 days prior to start of work.
3.1.6 Any Electrical Contractor performing work on roadways or signals must be approved to do work from the
NHDOT.
3.1.7. The Contractor shall be responsible for signal operation and maintenance once alterations to the existing
signals, excavation or other work within 75 feet of the stop bar at any leg has begun. At this point in time the
Contractor shall notify the City with names and phone numbers of persons to be contacted in case of a malfunction.
The Contact person must be available 24 hours a day, seven days a week. The Contractor shall also keep a signal log
in the cabinet to track all maintenance work they complete on the signal system. This log shall be placed within a
plastic cover and shall at least include the description of the trouble call, corrective action taken, date, time, and
personnel who completed the work.
Add Section 3.17 to read as follows:
3.17.1 Each programmable local hardware component installed by the contractor (i.e. loop detector amplifier,
emergency vehicle preemption phase selector) shall be initially programmed by the Contractor based on information
contained on the plans. Note: Three bound sets of hard copy programming per device shall be supplied to the City of
Nashua by the CONTRACTOR.
3.17.2. The CONTRACTOR shall supply an 8%”x11” laminated copy of the traffic signal design plan and sequence and
timing chart to be left in the cabinet documentation envelope mounted on the inside of the cabinet door.
Construction Specifications.doc 8-7
