623.01 557 ITEM 623 CONSTRUCTION LAYOUT STAKES AND SURVEY MONUMENTS
623.01 Description
623.02 Materials
623.03 Definitions
623.04 Verification
623.05 Placement, Protection and Restoration of Survey Monuments
623.06 Primary Project Control
623.07 Right -of-Way Staking
623.08 Construction Layout Staking
623.09 Providing Electronic Instrumentation
623.10 Method of Measurement
623.11 Basis of Payment
623.01 Description . This work consists of furnishing, placing, and maintaining
construction layout stakes nec essary to perform the Work under the Contract. This work also includes verification, placement, protection, and necessary restoration of primary project control monuments, monument assemblies, reference monuments (which include centerline monuments and cen terline reference monuments), and Right -of-Way monuments. Ensure that all work associated with locating and setting reference monuments, Right -of-Way monuments, and steel rods in monument assemblies is performed by a Registered Surveyor. Ensure that all ot her surveying and layout work described below is supervised by a Registered Engineer or a Registered Surveyor.
623.02 Materials. Furnish materials conforming to:
Concrete, Class QC Misc or QC 1 ............................... 499 Cast frames and covers ............. 711.12, 711.13, or 711.14 Concret e sand (fine aggregate) ........................... 703.02.A Stainless steel bolts ................................ ................. 730.10 Steel rods ................................ ................................ 709.01 Pipe ................................ ........... 706.07, 706.09, or 707.45
623.03 Definitions
A.Survey Monuments. Includes primary project control monuments (including azimuth marks and temporary benchmarks), monument assemblies, centerline monuments, centerline reference monuments, and Right -of-Way monuments.
B.Primary Project Control Monument . A surveyed position that is established and constructed according to the Department’s Survey and Mapping Specifications . Primary project control monuments will have associated azimuth marks and may have associated temporary benchmarks.
C.Monument Assembly . A surveyed position typically set inside pavement that consists of a steel rod housed inside a monument assembly box with a cast frame and cover according to SCD RM-1.1.
D.Reference Monuments 623.04 558 1. Centerline Monument . A surveyed position outside of pavement that consists of a steel rod and aluminum cap encased in concrete according to SCD RM - 1.1 that defines the centerline.
2.Centerline Reference Monument . A surveyed position outside of pavement that consists of a steel rod and aluminum cap encased in concrete according to SCD RM -1.1, that defines the centerline based on a specific offset from that centerline.
E.Right -of-Way Monument . A property boundary monument set according to SCD RM -1.1 to comply with Ohio Administrative Code Section 4733 -37, “Standards for Boundary Surveys in the State of Ohio” and recited in the Right -of- Way deeds to convey the property or easement ri ghts. Right -of-Way monuments are set at property corners, property line intersections, points along the Right -of-Way and angle points on the Right -of-Way.
F.Azimuth Mark. A project control monument set at the end points of the project for use as a “backsight” point.
G.Temporary Benchmark. A vertical position transferred from a primary project control monument.
623.04 Verification . Verify the position of all survey monuments shown in the
Contract Documents prior to construction activities. Use stand ard acceptable surveying measurement techniques suitable to meet the requirements of Ohio Administrative Code Section 4733 -37, “Standards for Boundary Surveys”. Have a Registered Surveyor prepare a verification report with the coordinates, station, offset, and a description of each survey monument found before beginning earth moving, resurfacing, or paving activities. Include the size, material, condition, any cap stamping or markings, and note any differences from the plan locations of the survey monuments . Have the Registered Surveyor sign and seal the verification report and submit it to the Engineer and the District Survey Operations Manager. If additional survey monuments not shown in the Contract Documents are encountered, protect, reference, and prese rve them in the same manner as survey monuments that are shown in the Contract Documents. Include the additional survey monuments in the verification report.
623.05 Placement, Protection and Restoration of Survey Monuments . When
specified in the Contract Documents, locate, construct, and position primary project control monuments according to the Department’s Survey and Mapping Specifications . Construct all other survey monuments according to SCD RM -1.1. Do not disturb survey monuments, cornerstones, or bo undary monuments during construction unless specified in the Contract Documents. Restore survey monuments damaged or destroyed by construction activities, unless directed otherwise by the Engineer. Have a Registered Surveyor prepare a report and drawing wi th the coordinates, station, offset, and description of each survey monument that is constructed or restored. Have the Registered Surveyor sign and seal the verification report and submit it to the Engineer and the District Survey Operations Manager. 623.06 559 If the Department must repair, replace, or resurvey the location of any survey monuments, cornerstones, or boundary monuments that are damaged, destroyed, or made inaccessible by the Contractor or its employees, subcontractors, or their agents, then the Enginee r will deduct the costs incurred by the Department from the estimates to the Contractor.
623.06 Primary Project Control . Primary project control governs all
positioning for Department projects. Use project control information provided in the plans for all project related survey operations. Establish and construct primary project control monuments according to the Department’s Survey and Mapping Specifications .
623.07 Right -of-Way Staking . Stake Right -of-Way lines where work will be
performed before beginning the work. Stake Right -of-Way lines by placing tall stakes, properly identified and readily discernible, at points of change in width or direction of the Right -of-Way line and at points along the line so that at least two stakes can be seen distin ctly from any point on the line. The Engineer will not require the Contractor to set additional stakes to locate a utility line that is not included as a pay item in the contract, or to determine the property line between properties.
623.08 Construction L ayout Staking . Furnish and install construction layout
stakes as required to construct the project and along both sides of the centerline of construction, 3 feet (1 m) outside of the grading limits at maximum spacing intervals shown in the table bel ow. Replace stakes as directed by the Engineer. TABLE 623.09 -1 MAXIMUM SPACING OF C ONSTRUCTION LAYOUT S TAKES Length of project Spacing Length of project Spacing Less than 1/2 mile 200 feet Less than 1 km 50 m 1/2 mile to 1 mile 500 feet 1 km to 2 km 200 m Over 1 mile 1000 feet Over 2 km 500 m Before performing a portion of the Work, submit a copy of the construction layout notes for that portion to the Engineer. The construction layout notes must contain information sufficient for the Engine er to verify the construction layout. The Contractor is responsible for having the finished Work conform to the lines, grades, elevations and dimensions shown on the plans. Any inspection or checking of the Contractor’s layout by the Engineer and the accep tance of all or any part of it does not relieve the Contractor of that responsibility. The removal of construction layout stakes at the completion of the Work is a final cleanup item that is required as a condition of full payment for Item 624 Mobilization .
623.09 Providing Electronic Instrumentation . If specified as a pay item,
provide the Engineer with electronic instrumentation so that the Department can verify the construction layout, perform check sections, and document pay items. Provide a survey -grade, global navigation satellite system (GNSS) receiver and data collector. Provide equipment that meets the requirements of the Department’s Survey and Mapping Specifications .
Source: Ohio Construction and Material Specifications, 2019 Edition. Pages 0–0 of 928.