Thomco Construction Inc. 6/14/2021

CITY OF EVERETT SPECIAL PROVISIONS paving, channelization, illumination, signing, bridges, and retaining walls, if such ' construction is included in this Project. Except for the survey control data to be furnished by the City, calculations, surveying, and measuring required for setting and maintaining the necessary lines and grades shall be the Contractor's responsibility. The Contractor ' shall provide the City with copies of such calculations and staking data when requested by the Engineer. Copies of the City provided survey control data are available for the Bidder's inspection at the office of the Project Engineer. ' Any staking requirements for the Project that do not fit field conditions will be reviewed and if necessary adjusted by the Engineer. Any necessary revisions to the staking information will be provided to the Contractor for use in completing the Work. ' Stakes, marks, and other reference points, including existing monumentation, set by the City shall be carefully preserved by the Contractor. The Contractor will be charged for the costs of replacing stakes, markers and monumentation that were not to be disturbed but were destroyed or damaged by the Contractor's operations. This charge will be ' deducted from monies due or to become due to the Contractor. To facilitate the establishment of these lines and elevations, the City will provide the Contractor with the following survey control: ' ROADWAY, SURFACING AND PAVING Establish elevation bench marks and center or base line alignment control points for the mainline, one time only. Provide right of way stakes where applicable. Provide rights-of-way, easements or right-of-entry. Provide the Contractor with technical advice if requested. ' Computed grades where needed. Provide horizontal and vertical curve data. ' One copy of transit notes showing reference to horizontal and vertical control points. OTHER STRUCTURES ' Centerline or offset coordinates to centerline of the structure. A sufficient number of bench marks for levels to enable the Contractor to set grades at reasonably short distances. ' Monuments and control points as shown on the Plans. The Contractor shall give the City three weeks notification to allow adequate time to provide the above data. ' The Contractor shall ensure a surveying accuracy within the following tolerances: 1. Slope stakes ±0.1 foot 2. Subgrade blue tops ±0.01 foot ' 3. Stationing ±0.01 foot 4. Alignment ±0.01 foot 5. Surfacing red & yellow tops ±0.01 foot ' 6. Superstructure elevations ±0.01 foot (from plan elevations) 7. Substructure ±0.02 foot (from plan elevations) The Contractor shall slope stake the roadway before any construction may proceed. ' Slope stakes shall be set at 50' maximum intervals on tangents and 25' on curves. Subgrade bluetops and surfacing red and yellow tops shall be set at 50' intervals in tangent sections, 25' intervals in curve sections, and 10' intervals in intersection radii. Water Main Replacement"V" Division 1 -GENERAL REQUIREMENTS April,2021 WO No-UP3730 SP-59