Ultrathin Cold Milling: Edge milling shall consist of using a cold milling machine at least six (6) foot in width. All areas that are edge milled shall transition from 5/8” to 0” in the 6 feet. This will include milling along the outside curb line, medians, and drive entrances. The area for edge milling will be calculated for payment based on a 6-foot-wide pass even if the milling machine’s cut is wider than 6 feet. The drive entrances shall transition from 5/8” to 0” in 50’ on either side of the entrance. Transition milling will take place at the beginning and end of the project limits and abutting bridges and intersections. The transition milling shall transition from 5/8” to 0” in the 50 feet. Side Street Approach Milling will require the complete milling of the side street approach in the rare case where the approach pavement type is the same as the arterial street being paved but different than the pavement type of the majority of the side street. All work for milling will be subsidiary with the bid item “Cold Milling”. Estimated milling quantities per location are listed on Attachment C. All millings from this project will need to be salvaged to either the West Maintenance Facility, 5801 W. 3 rd St. N, or Northeast Maintenance Facility, 2901 E 33rd St. N. Delivery is incidental to the cost of milling and is not paid as a bid item. Application Rate: The target application rate of the ultrathin bonded overlay shall be 65 lbs/sy. Longitudinal Construction Joints. All longitudinal paving joints shall conform to existing lane widths. No longitudinal paving joints will be allowed in the wheel paths of traffic lanes. Any specialized instances or deviations will require prior approval from the Engineer. Manhole Adjustments. All manhole adjustments will be marked in the field prior to overlay by the contractor. The number and type of manholes per street location is listed on attachment D. For all adjustment using the existing ring and lid, the contractor has the option of using the American Highway Products manhole riser ring to bring the lid up to grade. If the adjustment is made after the overlay, asphalt repairs shall then be made around the manhole (2” min) to match grade. Milling may be necessary to obtain the full 2”. With new ring and lid adjustments, concrete base shall be poured within 2” of new surface with new asphalt placed for final surface. All cost for concrete, asphalt, ring and lid, or any other materials needed for these adjustments shall be subsidiary to the ring and lid adjustment bid items. For all adjustments, the contractor shall make pavement repairs 5’ (feet) square around the manhole. Water Valve Adjustments: All Water Valve locations will be marked in the field prior to overlay by the contractor. The number of water valves for each street section is listed on attachment D. The intent is to use the existing box and lid; the contractor will install an adjustment riser prior to paving to bring the lid up to final pavement elevation. The risers come in a 1” and 1 ½” thickness. The contractor will use the appropriate riser such that the final elevation of the valve lid is at or less than 1” below final pavement elevation. All Water Valves whether adjusted or not shall be exposed and accessible after the placement of the overlay. Street Repair Prep: Work on this project consists of partial depth asphalt repair, curb and gutterrepair, and concrete base repair as directed by the Engineer. The cost shall include all the necessary work to complete the repairs such as pavement removal and compaction of sub-grade. Tentative locations are shown in Attachment C. All the asphalt used on this project shall be BM-2 (PG 64-22 max 35% RAP) for Base Course and BM-2 (PG 64-22 max 15% RAP) for Surface Course. Minimum Patch Repair Sizes: For all concrete work, excluding curb and gutter, the minimum patch size shall be 36 square feet in size (6 ft x 6 ft). For partial depth asphalt repairs, the minimum patch size shall be 18” x 24” in size. Asphalt Repairs:Work consists of milling 2” to 4” of asphalt pavement thickness and replacing with 2” to 4” asphalt surface coarse. Depth of cut will be determined by the project inspector. Asphalt rep shall be compacted to 95% density. The asphalt repair shall be paid in tons of asphalt. Asphalt repairs must have areas filled within 96 hours of the milling operations on all arterial locations. This includes work for partial and thermal crack repairs. For any areas that are not filled with asphalt within 96 hours after milling, the contractor will be charged liquidated damages of $500 per day per location until asphalt is placed. All asphalt repairs shall be compacted per the standard specifications and shall be compacted to 95% density. Any repairs that settle more than one-quarter of an inch or are one-quarter of an inch above the existing pavement surface after placement, the contractor will be required to mill 1” and replace with new asphalt to a level even with adjacent pavement surface. On all repairs, the final surface shall not deviate more than onequarter of an inch from a straight edge in ten feet in length. All work for these corrections will be at the contractor’s expense. Concrete Base Repairs in composite locations includes the removal of asphalt surface course and removal and replacement of the concrete base as directed by the Engineer. The bid item “8” Reinf. Concr. Base Repair” consist of the removal and replacement of the concrete base. All asphalt surface that is placed over the concrete base will be paid for by the ton with the bid item “Asphalt Repair (BM-2) (PG64-22)”. The final asphalt surface shall be 2” in depth and flush with adjacent pavement surfaces. All cost for removal of the asphalt surface shall be subsidiary to other bid items. All concrete pavement shall be reinforced with 6 X 12, W4 X W4 welded wire mesh. Material for sealing joints in the new pavement shall be Crafco Road Saver #221 or pre-approved equal. No. 4 rebars 2'0" long on 30" centers with a minimum of 2 bars in any patch side shall be drilled and epoxied into existing concrete. The Epoxy shall be Simpson SET High Strength or equivalent. Hammering rebars into concrete is not allowed. The cost of all the necessary work to complete the repair work, such as full depth saw cut, removal and replacement, is subsidiary to that particular repair bid items. All base repairs and concrete pavement repairs, regardless of location, require full-depth saw cuts. All saw cutting will be considered subsidiary to the other bid items.
