623.01 Description. This work consists of furnishing the accurate horizontal and vertical
locations for the construction of the Work shown in the contract documents. Acceptable methods include, placing, and maintaining construction layout stakes, real time layout utilizing survey equipment (GPS, Total Station, Level) and automated machine control and guidance. This work also includes verification, placement, protection, and any necessary restoration of project control monuments, monument assemblies, reference monuments, rig ht-of-way monuments, property line/boundary monuments and other survey monuments. Use Geodetic and/or Primary Project Control monuments as the basis for all construction layout staking and verification, placement, protection, and restoration of survey monuments. Ensure that all work encompassing the verification, placement, protection, and restoration of survey monuments is performed under the supervision of a Registered Surveyor and certify that the accuracy of all measurements meets Ohio Administrative Code Section 4733-37 and the ODOT Survey and Mapping Specifications. Ensure all construction layout is performed under the supervision of either a Registered Surveyor or a Registered Engineer.
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 Concrete 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.Geodetic/Primary Project Control Monument. A monument which is constructed by ODOT or its Design consultant and is positioned in compliance with the ODOT Survey and Mapping Specifications.
B.Survey Monuments. Includes primary project control monuments (including azimuth marks and temporary benchmarks), monument assemblies, centerline monuments, centerline reference monuments, Right-of-Way monuments, property line/boundary monuments and local, state or federal geodetic control monuments.
C.Monument Assembly . A monument typically within paved areas, that consists of a steel rod housed inside a monument assembly with a cast frame and cover according to SCD RM-1.1 that is used to define a geometric position of a point on the centerline of Right-of-Way or a point of common report such as a section corner, lot corner, or VMS corner.
D.Centerline Monument. A monument typically outside of paved areas that consists of a steel rod and aluminum cap encased in concrete according to SCD RM-1.1 where the surveyed position defines a geometric point on the centerline of Right-of-Way.
E.Centerline Reference Monument. A monument outside of paved areas that consists of a steel rod and aluminum cap encased in concrete according to SCD RM -1.1, where the surveyed position references a geometric point on the centerline of Right-of-Way with a known bearing/station and offset distance.
F.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 property or easement rights. 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.
G.Azimuth Mark. A project control monument set for use as a “backsight” point.
H.Temporary Benchmark . A monument with an elevation transferred from a primary project control monument used for construction layout purposes only.
623.04 Survey Monument Verification. Verify the position of survey monuments shown in the
Contract Documents including the project control and those shown in the right-of-way plans and locate any additional survey monuments if discovered within the right -of-way in the project work area . Generate a report detailing the surveyed location of all monuments. Use standard acceptable surveying measurement techniques suitable to meet the requirements of Ohio Administrative Code Section 4733- 37, “Standards for Boundary Surveys”. Survey monument verification is required on all projects where survey monuments are specified in the Contract Documents including pavement resurfacing, reconstruction and repair projects where monument assemblies will be adjusted or reconstructed to grade. Use the Department’s standardized verification report template. The “ Survey Monument Verification Report” template can be downloaded from the following website: www.dot.state.oh.us/divisions/constructionmgt/admin/pages/default.aspx.
A.Preconstruction Survey Monument Verification. Preconstruction Survey Monument Verification is performed to identify any discrepancies or changes to the usability of the project control monuments specified in the Contract Documents and to identify all required survey monuments within the right-of-way in the project work area that could be damaged or destroyed by construction activities. If additional survey monuments are discovered within the right-of-way in the project work area and are not shown in the Contract Documents, locate, protect, reference, and preserve them in the same manner as survey monuments in the Contract Documents. Include the additional survey monuments in the Survey Monument Verification Report. Perform this work before beginning earthwork, resurfacing, or construction activities. Have a Registered Surveyor prepare a Survey Monument Verification Report detailing the point number, surveyed coordinates, station, offset, a description of each survey monument found and the calculated differences in the Northing, Easting and Elevation from the plan location. Descriptions should include the size, material, c ondition, depth and any cap stamping or markings. Any differences between plan and observed coordinates exceeding 0.10 feet will be highlighted for remediation as approved by the District Survey Operation Manager and detail remedial actions for each necess ary monument in the Survey Monument Verification Report . Have the Registered Surveyor sign, seal, and date the Survey Monument Verification Report and submit it to the Engineer and the District Survey Operations Manager. Unless required by the District Survey Operations Manager , Preconstruction Survey Monument Verification is not required for projects without project control monuments and when the anticipated work only requires adjustment or reconstructing monument assemblies to grade without direct changes to the monument within the assembly.
B.Post Construction Survey Monument Verification. Post Construction Survey Monument Verification is performed to ensure that all required survey monuments as specified in the Contract Documents, and additional monuments found during the Preconstruction Survey Monument Verification, are preserved, set, reset, and/or adjusted to grade. Perform this work after completion of final grading and/or resurfacing and construction activities. Have a Registered Surveyor prepare a Survey Monument Verification Report detailing the point number, surveyed coordinates, station, offset, and a description of each survey monument. Include the size, material, condition, depth any cap stamping or markings, and calculate the differences in the Northing, Easting and Elevation f rom the plan location. Differences exceeding 0.10 feet will be highlighted for remediation as approved by the District Survey Operation Manager and detail remedial actions for each necessary monument in the Survey Monument Verification Report. Have the Registered Surveyor sign, seal and date the Survey Monument Verification Report and submit it to the Engineer and the District Survey Operations Manager. Post Construction Survey Monument Verification is required for standard resurfacing projects for all monument assemblies adjusted or reconstructed to grade. Primary Project Control Monuments do not require post construction verification unless specified by the Contract Documents or requested directly by the Engineer
623.05 Placement, Protection and Restoration of Survey Monuments . Construct or replace
all required survey monuments specified in the Contract Documents. Do not disturb survey monuments, cornerstones, or boundary monuments during construction unless specified in the Contract Documents. Restore survey monuments damaged or destroyed by construction activities, unless directed otherwise by the Engineer. Restore damaged survey monuments at locations specified in the Contract Documents or in their original location if the monument was not included in the Contract Documents. For a survey monument that cannot be installed in the location shown on the plans, notify the Engineer who will contact the District Survey Operations Manager to provide direction. Report monuments placed in locations other than in the specified locations in the Post Construction Survey Monument Verification Report . Do not place a monument in an alternate location without the prior approval of the District Survey Operations Manager . Refer to the Department’s Real Estate Manual, Appendix K, for guidance on how to proceed with setting monuments in alternate locations.
623.06 Geodetic/Primary Project Control . Geodetic/Primary Project Control governs all
positioning for Department projects. Use project control information provided on the plans for all project related survey operations.
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 distinctly 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 Layout. Construction Layout will be performed in a manner to allow the
contractor to properly construct the improvements on, below and above the ground at locations as defined by the contract documents and to allow for proper verification of said locations by th e Department. All layout work will be relative to the Geodetic/Primary Project Control monuments. Applicable methods include, but are not limited to the following:
A.Furnish construction layout hubs, nails and stakes as required to construct the project per the Contract Documents.
B.Automated machine control and guidance utilizing alignments and models defined by the project plans included in the Contract Documents.
C.Real time layout by GPS, Total Station or Leveling Device per the Contract Documents and relative to the Geodetic/Primary Project Control monuments. Submit a copy of the construction layout notes and raw data files to the Engineer upon request. The construction layout notes must contain enough information for the Engineer 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 acceptance 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 tha t meets the requirements of the Department’s Survey and Mapping Specifications. Provide equipment, software, and all three -dimensional models needed to verify layout, perform check sections, and document pay items. Train the Engineer on how to use the provided equipment and software and provide technical assistance during the duration of the Work. Upon completion of the Work, the electronic equipment, computer and software will remain the property of the Contractor. If using GNSS methods to construct the project and a pay item for providing electronic instrumentation is not specified, provide the Engineer with the three-dimensional models in electronic format when requested. Provide the models at no additional expense to the Department.
623.10 Method of Measurement . Estimated unit quantities for constructing new monuments,
adjusting or reconstructing monuments to grade, and replacement of Survey Monuments expected to be destroyed are included in the Contract Documents. The Contractor will be compensated on a unit basis for additional survey monuments found, located, and reconstructed or replaced within the right - of-way in the project work area but not shown on the plans. Survey Monuments on or outside of the Construction Limits are the Contractor ’s responsibility to protect and restore as required. The Department will not pay for restoration of these items.
623.11 Basis of Payment . Payment for lump sum Construction Layout Stakes and Surveying
includes payment for Construction Layout, Right of Way staking, and Placement, Protection and Restoration of Survey Monuments . Payment for lump sum items Pre/Post Construction Survey Monument Verification and Report includes payment for all surveying necessary to locate, verify and report survey monuments in Survey Monument Verification. The Department will consider the cost of locating new survey monuments to be included in the unit price bid for the survey monument. The Department will pay for accepted quantities at the contract prices as follows: Item Unit Description 623 Lump Sum Construction Layout Stakes and Surveying 623 Lump Sum Providing Electronic Instrumentation 623 Each Primary Project Control Monument, Type A 623 Each Primary Project Control Monument, Type B 623 Each Monument Assembly, Type C 623 Each Monument Assembly, Type D 623 Each Monument Assembly, Adjusted to Grade 623 Each Monument Assembly, Reconstructed to Grade 623 Each Monument Assembly Removed and Reset 623 Each Reference Monument, Type A 623 Each Right of Way Monument, Type B 623 Lump Sum Preconstruction Survey Monument Verification and Report 623 Lump Sum Post Construction Survey Monument Verification and Report
Referenced in this section
Sections that cite this one
Get an email when 623 changes
Ohio revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Construction and Material Specifications, 2023 (rev. 7/17/2026) Edition. Pages 533–538 of 892. View official source ↗