625Construction Surveying

Construction Surveying Description

625.01This work consists of the construction surveying, calculating, and staking necessary for

the construction of all elements of the project. The work shall be done under the supervision of a Professional Land Surveyor (PLS) or Professional Engineer (PE) who is experienced and competent in road and bridge construction surveying and licensed in the State of Colorado. Locating, preserving, referencing, installing and restoring land monuments such as Primary Control monuments from which the right of way or any land boundary will be calculated, described or monumented, Public Land Survey System (PLSS) monuments, General Land Office (GLO) monuments, Bureau of Land Management (BLM) monuments, Mineral Survey (MS) monuments, Right-of-way (ROW) monuments, property boundary monuments, easement monuments, and other monuments that are required by law or regulation to be established by a PLS, and the determination of any land boundary, shall be done per Section 629, under the supervision of a Professional Land Surveyor (PLS) who is experienced and competent in Right of Way and boundary surveying and licensed in the State of Colorado.

The PLS shall be available to review work, resolve problems, and make decisions in a timely manner.

Unless specified otherwise in the Contract, all survey procedures shall be in conformance with the CDOT Survey Manual. If the Revision of Section 102 Project Plans and Other Data states 3D modeling data is available, the Contractor may choose to perform 3D Engineered Construction Surveying (3DECS). 3DECS is the use of global positioning and or robotic instruments to guide construction equipment operations by comparing 3D model information in real time. For 3DECS, either the construction equipment is fed modeling information and makes automatic adjustments (machine control), or the equipment operator is fed the information and makes physical adjustments. Adobe Sign software shall be used for electronic seals by the Contractor’s Engineer, a Professional Engineer, or a Professional Land Surveyor. Electronic signatures and seals shall comply with the requirements of the Architects, Professional Engineers, and Professional Land Surveyors Rules and Regulations, 4 CCR 730-1.

Materials and Equipment

625.02The Contractor shall furnish all personnel, survey equipment, safety equipment,

materials, and traffic control necessary to perform the required construction surveying and staking. All surveying equipment, including: Total stations, LiDAR scanners, levels, rods, tapes, tripods, tribrachs, and Global Positioning System (GPS) receivers and equipment, shall be checked and calibrated per the CDOT Survey Manual, Chapter 6, Section 6.1.10, and documented in the survey records before the start of work and every six months thereafter.

625.03 Electronic Distance Measuring Instruments (EDMI) and total stations shall be checked and calibrated on a National Oceanic and Atmospheric Administration/ National Geodetic Survey (NOAA / NGS) calibrated baseline per the CDOT Survey Manual, Chapter 2, Section 2.1 and 2.2, and documented in the survey records before the start of work and every six months thereafter.

GPS receivers and equipment shall be checked and calibrated on a NOAA / NGS calibrated baseline per the CDOT Survey Manual Chapter 3 and documented in the survey records before the start of work and every six months thereafter.

Levels shall be checked and calibrated per the CDOT Survey Manual, Chapters 5 and 6, and documented in the survey records before the start of any level circuit.

If any survey equipment is found to be functioning outside the manufacturer’s specified tolerance, certification from an approved repair facility showing that the instruments have been repaired, properly adjusted, or both if necessary shall be included in the survey records and submitted to the Engineer before being used.

Traffic control shall be per Section 630.

Construction Requirements

625.03General. The Department will establish Primary horizontal and vertical control for

the project. All available information defining the extent of that control is provided on the plans per the CDOT Survey Manual Chapter 6 or is available from the Engineer. A Presurvey Conference – Construction Survey shall be held per the CDOT Survey Manual Chapter 6, before performing any surveying work under this section. The Engineer, Region Survey Coordinator (or designee), Contractor’s Superintendent, Contractor’s Surveyor (PLS) and Party Chief shall attend. A Presurvey Conference – Construction Survey Form shall be included per the CDOT Survey Manual Chapter 6. A surveying work schedule shall be submitted to the Engineer for review before the conference.

625.04Contractor Surveying. The Contractor shall perform all construction surveying and

staking necessary for construction of the project. Construction surveying and staking shall be based on the Primary Horizontal and Vertical Control established by the Department. Bid items that require stakes to be set by the Contractor’s Surveyor are shown on the Surveyor Tabulation Sheet of the plans and shall be per the CDOT Survey Manual Chapter 6. If the Contractor uses 3D Engineered Surveying the following shall apply:

the Department.

centerline or Engineer approved offset line (i.e., POT, POC, PCC, PC, PT, TS, ST, SC, CS per the Survey Manual) and angle points, all of which shall be established from primary control monuments and their assigned coordinates as shown on the plans.

centerline control points as shown on the plans in order to provide a method of machine control equipment checks, inspection, and field verification.

625.04

feet on curves or as specified on the survey tabulation sheet. All project centerline control points as shown on the plans shall be staked.

3DECS system and verify on writing to CDOT that the accuracy of the system complies with the contract requirements.

relocated utility lines as shown on the utility plans, including those installed or relocated by the Contractor or by others.

The as-constructed survey shall be completed per the CDOT Survey Manual, Chapter 6, Section 6.14.

At no cost to the Department, the Contractor shall revert to traditional surveying and disband using 3DECS should the Engineer determine the existence of contractor quality or accuracy issues related to 3DECS. The Contractor shall check all Department established Primary horizontal and vertical control points per the CDOT Survey Manual Chapter 6, and verify and document in the survey records their horizontal accuracy tolerance per the CDOT Survey Manual Chapter 5, and their vertical accuracy tolerance per the CDOT Survey Manual Chapter 6, for a CDOT Class A, Primary Survey before using them for construction surveying control.

Permanent Water Quality As-Constructed Survey. The Contractor shall complete an as- constructed survey of each Permanent Water Quality (PWQ) control measure (CM). Surveys are conducted on all PWQ CM for two reasons:

• To provide initial location information for CDOT PWQ CM inventory, and • To provide necessary data for completion of the Pond Information Certification (PIC) for PWQ CM designed using the Water Quality Capture Volume (WQCV) Standard (Extended Detention Basin (EDB), Retention Pond, etc.)

The Contractor shall submit the as-constructed survey to the Project Engineer. The electronic as-constructed survey shall conform to the requirements of Section 625, use Terrain Modeling Survey System (TMOSS) codes, and shall include the following information:

• The Contractor's Professional Land Surveyor’s (PLS) digital terrain model with the electronically sealed field-collected information report. • The PWQ survey shall include all horizontal and vertical reference points for all PWQ features as determined by the Contractor’s surveyor. • The contours shall be shown at 1-foot intervals with major contours labeled at 5-foot increments. • The bottom of the EDB elevations along the toe of embankment slope and top and bottom of trickle channel elevations, to verify positive drainage throughout the basin with labels of features, elevation, and the WQCV elevation as shown on the plans.

625.05 • The top of wall or dam elevation on the survey to verify freeboard (distance between high- water mark and top of wall or dam elevation) along the EDB, and the top width of the embankment along the perimeter of the EDB. • A detail of each forebay located at the outfall of each incoming storm drain into the EDB, including plan dimensions with tops of walls, tops of slabs, pipe invert elevations, and pipe diameters. • The basin location related to property lines (measured distances), right-of-way lines, buildings, roads, access paths, and other easements. • The details of the outlet control structure, including labels of features and elevations, and notes indicating if the features are the same as the design plan, or the reason they are different in the as-constructed survey. • The details, including labels and elevations of all grates, racks, screens, and any other materials intended to prevent clogging of the outlet structure orifices by debris of any kind. Label all features and elevations on the as-constructed deliverable CADD 3D model and Survey report. • The access and maintenance easements per the ROW plans around the EDB, including the maximum slope of the access easement. • The submitted CADD 3D model shall include the following:  All control marks set per item 2, and other Project Controls as shown on the sealed Project Control diagram; ensure that contour lines are continuous, closed, unbroken polylines.  Grade spot elevations and break lines used to create the contours.  Elevations for all applicable items listed in 2-10 above.  Correct contours.  Initial /EDB volume calculation report sealed by the PLS of the data collection.  Geocoordinate system that conforms to project datum.  Survey information shall be compatible with the latest 3D digital modeling software.

Submit the as-constructed survey, including field survey data, survey report, and electronic model files as a complete package to the Engineer. Allow 10 days for CDOT review of the field survey data.

If the field survey data, survey report or electronic model files indicate the control measure was incorrectly constructed, the Contractor shall perform necessary corrective work to the PWQ CM to ensure compliance with design, at no cost to the project, as directed by the Engineer.

The Contractor shall clean all Permanent Water Quality Control Measures before the PWQ Survey, final walkthrough and final acceptance. Payment for the as-constructed survey of EDBs and associated items, including creating the electronic 3D CADD model and report, shall be included in Item 625 Construction Surveying.

625.05Staking. Acceptable staking placement intervals for the various construction survey

items are described in the CDOT Survey Manual Chapter 6. Staking placement intervals specified on the Survey Tabulation Sheet have precedence over those in the CDOT Survey Manual. Stationing shall be established in the field on centerline or an approved offset.

625.06Accuracy and Tolerances. Horizontal and vertical accuracy tolerances for

Secondary Control surveys and monuments, and for each construction item being staked shall be as specified in the Contract or in the CDOT Survey Manual Chapter 6. If a discrepancy should occur, the higher degree of accuracy or the more restrictive tolerance shall apply.

625.07

Horizontal accuracy tolerances for Primary Control surveys and monuments shall be as specified in the CDOT Survey Manual Chapter 5. Vertical accuracy tolerances for Primary Control surveys and monuments shall be as specified in the CDOT Survey Manual Chapters 5 and 6.

Horizontal accuracy tolerances for Secondary Control surveys and monuments shall be as specified in the CDOT Survey Manual Chapter 6. Vertical accuracy tolerances for Secondary control surveys, monuments, and Secondary benchmarks shall be as specified in the CDOT Survey Manual Chapter 6. 3D Engineered surveying accuracy and tolerances shall be the same as the staking accuracy and tolerances stated in the CDOT Survey Manual.

625.07Responsibility and Inspection. Supervision and coordination of construction surveying

and staking is the Contractor’s responsibility. The Engineer may inspect the Contractor’s surveying; however, such inspection will not relieve the Contractor of any responsibility for accuracy or completeness of work. The Contractor shall check the work to verify the accuracy and include documentation of this check in the Survey Records. All Contractor surveying inaccuracies, errors, or omissions shall be corrected at the Contractor's expense. Engineer’s inspection or the Contractor’s corrections shall not entitle the Contractor to additional payment or contract time extension.

625.08Reset Monuments and Stakes. Primary and Secondary Control monuments,

benchmarks, and other significant stakes that are damaged, destroyed, or made inaccessible by the progress of construction shall be replaced, transferred or re-established at the Contractor's expense per the CDOT Survey Manual Chapter 6. A supplemental or amended Project Control Diagram shall be submitted to the Engineer and the Region Survey Coordinator for any replaced, transferred or re-established Primary Control monuments per the CDOT Survey Manual Chapter 6.

Locating, preserving, referencing, installing and restoring land monuments such as Primary Control monuments that the right of way or any land boundary will be calculated, described or monumented, PLSS monuments, GLO monuments, BLM monuments, MS monuments, ROW monuments, property boundary monuments, easement monuments, and other monuments that are required by law or regulation to be established by a PLS, shall be done per Section 629, under the supervision of a PLS who is experienced and competent in Right of Way and boundary surveying and licensed in the State of Colorado.

625.09Changes. All changes in lines and grades required by field conditions and all

discrepancies in grades, alignment, location or dimensions detected by the Contractor shall be immediately submitted to the Engineer in writing. No changes in given data or plans will be allowed unless approved by the Engineer in writing. All changes shall be documented in the survey records.

625.10Pay Quantities Measurements. The Engineer will perform all interim and final

measurements deemed necessary by the Department to determine contract pay quantities. The Contractor shall establish and maintain Primary and Secondary Control points and stationing as required for these measurements.

625.11

625.11Survey Records. Survey records shall be completed as the work is done. Field

survey notes for construction surveying and checking by the Contractor shall be recorded in survey records in conformance with the format given in the CDOT Survey Manual Chapter 6, Section 6.1.16. Survey fieldbooks shall be indexed per the Survey Manual Chapter 2.

The Contractor shall make all survey records generated available to the Engineer for inspection or reproduction at all times. The Contractor shall submit all survey records to the Engineer before final project acceptance. All survey records are considered property of the Department. The responsible PLS or PE identified in subsection 625.01 shall electronically seal all survey records.

The electronic format shall contain the information and format as required in the Survey Manual Chapter 2 and Chapter 6, including stakeout data and the raw data from the actual placement of stakes. The records shall be electronically sealed by the PLS in responsible charge identified in subsection 625.01.

Initial staking for major structures (overhead signs, concrete box culverts, bridges, and all other structures assigned a structure number) shall be done per the CDOT Survey Manual Chapter 6, from two independent setups. An independent check shall be made by the Contractor and shown in the survey records for all bridge structures.

Method of Measurement

625.12Construction surveying will not be measured but will be paid for on a lump sum

basis.

Basis of Payment

625.13Payment for construction surveying will be the contract lump sum bid and will be

full compensation for all surveying work necessary to complete the project as shown on the plans, to include all resetting of stakes, marks, monuments Secondary and Primary Control points, and preparing supplemental or amended Project Control Diagrams. Construction surveying required by plan force account or by additional work beyond the scope of the original Contract will be paid for at a negotiated rate not to exceed the rate established in Section 105. That rate shall also apply to reductions in construction surveying as impacted by reductions or deletions to the original contract work. Any survey work not performed to the contract requirements shall be subject to price reduction or rejection.

Partial payment for construction surveying, as determined by the Engineer, will be made as the work progresses. The Contractor shall submit a schedule of estimated contractor construction surveying time as required on the Survey Tabulation Sheet before the first partial payment is made. Copies of the Survey Records for all completed survey work shall be submitted to the Engineer before payment of the monthly estimate.

Before final payment is made, the Contractor’s responsible P.L.S. shall complete and electronically seal all survey records and the Project Control Diagram (supplemental or amended). Submit the survey records and the supplement or amended Project Control Diagram to the Engineer and the Region Survey Coordinator for review.

625.13

Payment will be made under:

Pay Item Pay Unit Construction Surveying Lump Sum

Traffic control for construction surveying will be measured and paid for per Section 630.

All costs associated with 3DECS surveying will not be measured and paid for separately but shall be included in the work.

625.13

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626.01