All Items of work in this Contract shall be governed by the "Commonwealth of Massachusetts, Highway Department (MassDOT) Standard Specifications for Highway and Bridges", dated 2024, including the latest supplements and addenda thereto. Work items are referenced with Item Numbers and Item Descriptions similar to those currently in use by the MassDOT Highway Division. The Methods of Measurement and Bases of Payment for Work Items shall be as called for under the appropriate sections of the MassDOT Standard Specifications The following items reflect special conditions particular to this project. As such, they amend and/or supplement the provisions governing the Item, as described in the Standard Specifications. ITEM 151. GRAVEL BORROW CUBIC YARD Work under this Item shall conform to the relevant provisions of Subsection 150 of the Standard Specifications and the following: GENERAL This work shall consist of furnishing and placing gravel borrow for the subbase material in areas of fulldepth pavement patching, sidewalk, pedestrian curb ramps, and driveways as directed by the City. Material shall be supplied by the Contractor where necessary to replace unsuitable material encountered during all aspects of construction. Gravel borrow used to replace unsuitable material shall be paid for only as requested and directed by the City prior to installation. Gravel borrow shall conform to Material Specifications M1.03.0 (Type b). Gravel borrow shall be placed with a maximum lift thickness of 6 inches. Where required, trenches shall be backfilled with approved granular materials and properly compacted to a minimum density of 95 percent of the maximum density as determined by ASTM D1557 (Modified Proctor). All other gravel areas shall be compacted to a minimum density of 95 percent of the maximum density. Any settlements or other defective work and materials shall be promptly repaired or replaced at the Contractor’s expense. The density of the compacted fill shall be determined by the ASTM D6938 Nuclear Method or latest ASTM standard. ITEM 701. CEMENT CONCRETE SIDEWALK CUBIC YARD The work under these Items shall conform to the relevant provisions of Section 700 of the Standard Specifications and the following: CITY OF METHUEN- CEMENT SLAB 9 GENERAL The work under these Items shall include the furnishing and installing of cement concrete sidewalks, driveway aprons, and pedestrian curb ramps at the locations directed by the City. Any reconstruction of private cement concrete walkways shall be paid for under Item 701. All work shall conform to the latest MassDOT Construction Standard Details, with the information contained in the Wheelchair Ramp Standard details E107.1.0 to E107.9.0, and the latest ADA and AAB regulations. The Contractor is hereby notified that they are ultimately responsible for constructing all project elements in strict compliance with the current AAB/ADA rules, regulations, and standards. The AAB Rules and Regulations specify maximum slopes and minimum dimensions required for construction acceptance. There is no tolerance allowed for slopes greater than the maximum slope or dimensions less than the minimum dimensions. All cement concrete sidewalks and pedestrian curb ramps shall be constructed with four (4) inches of cement concrete over eight (8) inches of gravel borrow. All cement concrete sidewalks at driveways shall be constructed with six (6) inches of cement concrete over eight (8) inches of gravel borrow. All cement concrete driveways and cement concrete pedestrian curb ramps shall include 3.0 lbs. /cubic yard of fiber reinforcement, Tuf-Strand Max Ten Macro-Synthetic Fibers or approved equal. All pedestrian curb ramp joints and transition sections, which define grade changes, shall be formed, staked and checked prior to placing cement concrete. All grade changes are to be made at joints. The Contractor is responsible for ensuring that all pedestrian curb ramps are designed to conform to AAB/ADA regulations and are approved by the City. All wheelchair ramps shall have detectable warning panels permanently embedded into the concrete at the bottom of the ramp. Detectable warning panels shall be installed as shown on the Plans and as detailed in MassDOT Construction Standards detail E 107.6.5, dated October 2017. The panel shall conform to ADA requirements, and color shall be brick red to match City standard. Sidewalks and Driveway Aprons shall be constructed in accordance with requirements of the latest Standard Specifications. Expansion fillersshall also be used at pours against buildings, walls, or other hard objects. The Contractor shall submit job mix formulas to the City for approval prior to commencing the work. In general, the concrete shall have the 4,000-psi minimum compressive strength at 28 days for Type II cement, a normal weight of 145 pounds cubic feet (pcf) nominal dry density, and 6.5% ± 1.5% air entrainment. The concrete slump shall not exceed 5 inches. Delivery slips shall be furnished to the field representative prior to commencing the work, field representative may at any time stop or restrict concrete placing if the mix appears to not meet specifications or appropriate slips are not provided
