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 necessary 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 centerline 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 other 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

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.      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

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 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.

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 standard 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 preserve 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 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.

Have a Registered Surveyor prepare a report and drawing with 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.

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 Engineer 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 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 Staking.  Furnish construction layout staking 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 below.  Replace staking as directed by the Engineer.

Table 623.09-1
Maximum Spacing of Construction Layout Stakes

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 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 that 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 quantities for replacement of Primary Project Control Monuments, Monument Assemblies, Reference Monuments, and Right-of-Way Monuments expected to be destroyed that are within the project construction work limits are included in the Contract Documents.  Estimated quantities for new monuments are also included in the Contract Documents.

Primary project control monuments, monument assemblies, reference monuments, Right-of-Way monuments, and boundary monuments on or outside the project construction work 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 Construction Layout Stakes and Surveying includes payment for Right-of-Way staking and verifying the location of existing survey monuments. The Department will consider the cost for 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

623             Each                                Reference Monument

623             Each                                Right-of-Way Monument