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Edgewater Creek Bridge Replacement November 2023 17 6. Establish roadbed and surfacing elevations by placing stakes at the top of 1 subgrade and at the top of each course of surfacing. Subgrade and surfacing 2 stakes shall be set at horizontal intervals not greater than 50 feet in tangent 3 sections, 25 feet in curve sections with a radius less than 300 feet, and at 10-4 foot intervals in intersection radii with a radius less than 10 feet. Transversely, 5 stakes shall be placed at all locations where the roadway slope changes and at 6 additional points such that the transverse spacing of stakes is not more than 12 7 feet. If GPS Machine Controls are used to provide grade control, then roadbed 8 and surfacing stakes may be omitted at the discretion of the Contractor. 9 10 7. Establish intermediate elevation benchmarks as needed to check work 11 throughout the project. 12 13 8. Provide references for paving pins at 25-foot intervals or provide simultaneous 14 surveying to establish location and elevation of paving pins as they are being 15 placed. 16 17 9. For all other types of construction included in this provision, (including but not 18 limited to channelization and pavement marking, illumination and signals, 19 guardrails and barriers, and signing) provide staking and layout as necessary to 20 adequately locate, construct, and check the specific construction activity. 21 22 10. Contractor shall determine if changes are needed to the profiles or roadway 23 sections shown in the Contract Plans in order to achieve proper smoothness 24 and drainage where matching into existing features, such as a smooth transition 25 from new pavement to existing pavement. The Contractor shall submit these 26 changes to the Engineer for review and approval 10 days prior to the beginning 27 of work. 28 29 The Contractor shall provide the Contracting Agency copies of any calculations and 30 staking data when requested by the Engineer. 31 32 The Contractor shall ensure a surveying accuracy within the following tolerances: 33 34 Vertical Horizontal 35 Slope stakes ±0.10 feet ±0.10 feet 36 Subgrade grade stakes set 37 0.04 feet below grade ±0.01 feet ±0.5 feet 38 (parallel to alignment) 39 ±0.1 feet 40 (normal to alignment) 41 42 Stationing on roadway N/A ±0.1 feet 43 Alignment on roadway N/A ±0.04 feet 44 Surfacing grade stakes ±0.01 feet ±0.5 feet 45 (parallel to alignment) 46 ±0.1 feet 47 (normal to alignment) 48 49