Agenda - Council - 06/27/2017 - Laserfiche WebLink

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SPECIAL PROVISIONS - SP20I6 BOOK Last Revision by CO Special Provisions: 2/08/17 Created August 20, 2015 Page 21 SP 0202-101 correcting the deficient facilities with no compensation paid for the corrective work. To ensure that the pedestrian facilities are constructed in compliance with PROWAG, the Contractor shall follow the following three steps: (1) The Contractor shall use the appropriate ramp, sidewalk, and driveway details, in the Plan and identify the removal limits for the sidewalk and curb and gutter. If Contractor determines the removal limits are not adequate to meet PROWAG, the Contractor shall stop work immediately and consult the Engineer to determine the best solution. Once the Engineer and the Contractor reach agreement on how to proceed, the Contractor may finish the removals. (2) Curb Ramps at Quadrants: Prior to pouring curb ramps at quadrants the Contractor must verify the zero height curb, and curb transitions will be located as shown in the Plans and will provide an adequate detectable edge as shown on standard plan sheet no. 5-297.250 (sheet 4 of 5). Verify curb tapers are constructed at correct heights so that positive boulevard slopes and drainage is maintained away from landings and sidewalks, to newly constructed curb and gutter sections. Check to ensure all top back of curb elevations will allow for matching into all required (sidewalk landing areas, doorways, steps, bus stops, and outwalks). The Contractor shall also verify the proposed curb flow lines will provide positive drainage as well as maintain existing drainage patterns including existing gutter inflows/outflows. The curb and gutter shall be constructed as detailed in the Plan with a defined flow line and no vertical discontinuities. For required flow line corrections including curb line raises and curb ramp cross slope "tabling" see Standard Plans (Sheet 6 of 6). Curb shall be poured at 3% inflow around the radius or at a minimum distance of 10 feet from any zero height curb section when machine place. The Contractor shall consult with the Engineer to determine a resolution if any of these conditions cannot be met. Once the Engineer and the Contractor reach agreement on how to proceed, the Contractor may proceed with pouring the curb and gutter. (3) Roadway sections with Pedestrian Facilities: Prior to pouring curb and gutter at roadway section the contractor must verify proposed curb and gutter heights will work with existing roadway and shoulder slopes. The contractor shall also check to ensure all top back of curb elevations will allow for adequate boulevard slopes and PAR slopes and widths while and maintaining all match points required at (sidewalk landing areas, doorways, steps, bus stops, and outwalks). The contractor shall check all driveway locations and widths and follow driveway details and plans for all driveway layout including curb heights, and curb tapers. Driveway curbs sections and aprons shall be constructed to minimize any changes in the sidewalk widths and elevation to avoid the "roller coaster" affect. The Contractor shall consult with the Engineer to determine a resolution if any of these conditions cannot be met. Once the Engineer and the Contractor reach agreement on how to proceed, the Contractor may proceed with pouring the curb and gutter. (4) After the curb has been correctly poured, and the Contractor has set the sidewalk forms. The Contractor shall verify prior to placing the concrete curb ramps/sidewalks that positive drainage is maintained within pubic R/W, as well as maintaining existing off R/W drainage, and that all the requirements in S-21.1(B) will be achieved. In addition, the longitudinal slopes shown in the Construction Plans and the Standard Plans shall be utilized unless these conditions cannot be met. The starting point for setting the forms on the controlling ramp leg should be the following: Steep (S) = 7% Flat (F) = 4% Landing = 1.5% Sidewalk Cross Slope = 1.5%