Rev. 9-1-95

IMPACT ATTENUATOR TYPE MP

601-R-184

DESCRIPTION. This work shall consist of the fabrication, assembly, and installation of impact attenuator type MP, in accordance with the manufacturer's recommendations, these requirements, and as shown on the plans.

MATERIALS. The Contractor shall have the option of utilizing the gravel barrel array or the Combination Attenuating Terminal. The gravel barrel array shall be either the Fitch Inertial Barriers as manufactured by FIBCO, Inc. or the Energite System Inertial Barriers as manufactured by Energy Absorption Systems, Inc. The Combination Attenuating Terminal shall be as manufactured by the Syro Steel Company. The configuration of the selected alternate unit shall be as crash tested and approved in accordance with FHWA requirements. If the Combination Attenuating Terminal unit is used, it shall include the transition section. If the gravel barrel array is used, it shall include the concrete pad. The concrete shall be class A in accordance with 702. The size and orientation of the concrete pad shall be as shown on the plans. The gravel used in the barrels shall be uncrushed coarse aggregate size No. 12 in accordance with 904.02. The required weight of gravel for each barrel shall be as shown on the plans.

CONSTRUCTION REQUIREMENTS. Assembly and installation shall be supervised or performed at all times by an installer trained and certified by the unit's manufacturer, and shall be in accordance with the manufacturer's recommendations at the locations shown on the plans. The grading required for the installation of the impact attenuator type MP shall be as shown on the plans. A copy of the installer's certificate shall be presented to the Engineer prior to the start of work.

The Contractor shall provide the Department with original copies of all necessary current manufacturer's installation manuals and shop drawings prior to beginning installation work. Shop drawings shall be a minimum of 560 mm by 865 mm (22 in. by 34 in.) in size. These manuals and drawings shall remain the property of the Department.

In case of dispute regarding installation, the manufacturer shall provide a properly trained representative, directly employed by the manufacturer, to ensure that the installation is performed in accordance with the manufacturer's recommendations.

METHOD OF MEASUREMENT. This work will be measured by the number of units installed.

BASIS OF PAYMENT. This work will be paid for at the contract unit price per each for impact attenuator type MP, complete in place. The costs of all materials, grading, labor, equipment, and necessary incidentals shall be included in the cost of this work.