628IMPACT ATTENUATORS

DESCRIPTION

628.20: General

Work under this subsection shall consist of furnishing, installing, and in the case of temporary, the removal of impact attenuators in close conformance with the specifications of the manufacturer, and in close conformance with the locations, lines, and gr ades shown on the plans and/or designated in the Special Provisions. MATERIALS

628.40: General

Materials shall meet the requirements specified in the following Subsections of Division III, Materials and as otherwise specified herein. Gravel Borrow ............................................................................................................................... M1.03.0 Cement Concrete .......................................................................................................................... M4.02.00 Impact Attenuators ..................................................................................................................... M9.18.0 Redirective Impact Attenuators ............................................................................................ M9.18.1 Non -Redirective Impact Attenuators .................................................................................. M9.18.2 Low -Maintenance Impact Attenuators ............................................................................... M9.18.3 Retroreflective Sheeting ........................................................................................................... M9.30.0 Impact attenuators shall be listed on the QTCE. The Contractor shall supply an impact attenuator that meets or exceeds the Test Level (TL) designated in the description of the bid item. The Contractor shall supply an impact attenuator for each location that can shield, at a minimum, the full width of the hazard but shall not exceed any maximum widths or lengths shown in the Plans or Special Provision. Impact attenuators on bridge decks or spanning bridge joints shall require no anchorage to the bridge deck unless approved by the Engineer. Transitions to rigid or semi -rigid barriers or connections to fixed objects such as bridge piers shall be supplied and installed by the Contractor and included in the unit price of the impact attenuator. The approach end shall include a Type 3 Object Marker conforming to the requirements of the MUTCD. The sheeting material shall meet the requirements of M9.30.0: Retroreflective Sheeting . The Contractor shall submit Shop Drawings for all materials a minimum of 60 days in advance of installation. Shop Drawings shall include a parts list, manufacturer’s instructions for installation, drawings, transition details and drawings (if needed), and all service, maintenance, and/or owner’s manuals. Any part of the system that varies from the exact make and model that was crash tested must be clearly identified in the Shop Drawings. The Contractor shall not proceed with installation prior to receipt of Shop Drawing approval. II.302 202 4 Edition 628.41: Permanent Impact attenuators classified as Permanent shall be installed by the Contractor and become property of the Department upon acceptance. Permanent impact attenuators shall be supplied with all new, unused parts. All materials and work associated with anchoring a Permanent Impact Attenuator, including the installation of a concrete slab if required by the manufacturer, shall be included in the bid price of the item.

628.42: Temporary

Impact attenuators classified as Temporary shall be installed by the Contractor and remain property of the Contractor during deployment and after removal. The Contractor shall be responsible for maintaining the attenuator in working condition throughout it s deployment and repairing and/or replacing damaged components or systems per Subsection 7.17: Traffic Accommodation . Temporary Impact Attenuators shall not require anchoring into a concrete foundation. Asphalt anchors, if required by the manufacturer, shall be supplied and installed by the Contractor and shall be included in the bid price of the item. The condition of Temporary Impact Attenuators shall meet the quality standards set forth in the Quality Standards for Work Zone Traffic Control Devices published by ATSSA. Failure to meet these minimum standards will require the Contractor to clean or replace any retroreflective sheeting at no additional cost. CONSTRUCTION METHODS

628.60: General

Excavation for attenuator foundations and anchorage, if required, shall be made to the required depth and to a width that will permit the installation and bracing of forms where necessary. All soft and unsuitable material shall be replaced with gravel borrow. The impact attenuator and any anchorage or transitions, if necessary, shall be installed in accordance with the manufacturer’s instructions. Any modification to the instructions or change in design due to field conditions must be approved by the Engineer.

628.61: Temporary Impact Attenuators

A Temporary Impact Attenuator shall be removed or removed and reset at the conclusion of the temporary traffic control plan setup and is no longer needed. The final removal shall be considered incidental to the cost of the item. Removing and Resetting Temporary Impact Attenuators shall consist of removing and then reinstalling a Temporary Impact Attenuator to a new location shown on the plans or as directed by the Engineer. Once a Temporary Impact Attenuator has been removed, the pavement surface shall be restored as needed. This work shall include filling any holes and the sweeping of any debris that may have II.303 202 4 Edition accumulated around it during deployment. This work shall be considered incidental to the cost of the item. A damaged Temporary Impact Attenuator shall be repaired or replaced within 24 hours. The damaged location shall be protected by a Truck Mounted Attenuator, or as directed by the Engineer, until the impact attenuator has been restored to working conditions. COMPENSATION

628.80: Method of Measurement

All impact attenuators will be measured as a single unit, each in place. Temporary Impact Attenuator Removed and Reset will be measured as a single unit, each, to completely remove and reinstall the attenuator to a new location.

628.81: Basis of Payment

All impact attenuators will be paid for at the contract unit price for each location, which includes full compensation for all labor, equipment, materials, foundation and/or anchorage, and all incidental work necessary to complete the work as specified. The final removal of a Temporary Impact Attenuator shall be considered incidental to the cost of the item. Temporary Impact Attenuator Removed and Reset will be paid for at the contract unit price for the entire remove and reset operation and will include full compensation for all labor, equipment, materials, anchorage, restoration, and all incidental work necessary to complete the work as specified. Adjusting a Temporary Impact Attenuator that has moved due to passing traffic or weather events and/or the movement of a Temporary Impact Attenuator to accommodate the Contractor is not considered Removing and Resetting and will not be paid for. Gravel Borrow required to replace unsuitable soils for any foundation and anchorage work will be paid for at the contract unit price under Item 151. Gravel Borrow. A Truck Mounted Attenuator, if required to protect a damaged Temporary Impact Attenuator, will be paid for at the contract unit price under Item 853.403 Truck Mounted Attenuator.

628.82: Payment Items

628.302 Permanent Impact Attenuator, Non -Redirective, TL -2 ................................ Each

3 Permanent Impact Attenuator, Non -Redirective, TL -3 ................................ Each

4 Temporary Impact Attenuator, Non -Redirective, TL -2................................ Each

5 Temporary Impact Attenuator, Non -Redirective, TL -3................................ Each

628.312 Permanent Impact Attenuator, Redirective, TL -2 .......................................... Each

3 Permanent Impact Attenuator, Redirective, TL -3 .......................................... Each

628.214 Temporary Impact Attenuator, Redirective, TL -2 .......................................... Each

5 Temporary Impact Attenuator, Redirective, TL -3 .......................................... Each

628.322 Permanent Impact Attenuator, Low -Maintenance, TL -2 ............................. Each

3 Permanent Impact Attenuator, Low -Maintenance, TL -3 ............................. Each

II.304 202 4 Edition SUB