Technical Exhibit C - Construction Surveying and Staking.pdf

Headquarters III Corps, Fort Hood Directorate of Public Works (DPW)

Technical Exhibit “C”

AD213050P

CLARKE ROAD -C RECONSTRUCTION

COCONSTRUCTION SURVEYING

AND STAKING

March 4, 2021

Solicitation No. W91151-21-B-00020002

Directorate of Public Works Engineering Division

US Army, III Corps 4612 Engineer Dr.

Fort Hood, TX 76544

Technical Exhibit - C AD213050P-North Clarke Road C Reconstruction 04MAR2021

SECTION 02 21 13

CONSTRUCTION SURVEYING AND STAKING

12/20

PART 1 GENERAL

1.1 REFERENCES

FEDERAL ACQUISITION REGULATION

52.236-17 Layout of Work

1.2 DESCRIPTION

This work consists of performing surveying, staking, calculating, and recording data for the control of construction work.

The Contractor shall lay out its work from Government established base lines and bench marks indicated on the drawings, and shall be responsible for all measurements in connection with the layout. With prior Government approval only, the contractor may establish base lines and benchmarks where existing Government assets are unavailable.

The Contractor shall furnish, at its own expense, all stakes, templates, platforms, equipment, tools, materials, and labor required to lay out and maintain any part of the work.

The Contractor shall be responsible for executing the work to the lines and grades that may be established or indicated by the Contracting Officer. The Contractor shall also be responsible for maintaining and preserving all stakes and other marks established by the Contracting Officer until authorized to remove them. Under no circumstances will GPS records be substituted for physical stakes along the project.

If such marks are disturbed during construction, or become illegible or destroyed by the Contractor through its negligence before their removal is authorized, the Contracting Officer may replace them and deduct the expense of the replacement from any amounts due or to become due to the Contractor.

1.3 QUALIFICATIONS

Provide technically qualified survey crews experienced in roadway or highway construction survey and staking, with oversight by a registered Professional Land Surveyor (RPLS). Provide personnel capable of performing in a timely and accurate manner.

1.4 SUBMITTALS

Submit the following prior to the start of work:

Include the following when Automated Machine Guidance (AMG) methods are used:

(a) Personnel qualifications.

(1) The name, authority, relevant experience, and qualifications of the survey personnel responsible for the layout of work.

(2) The name, authority, relevant experience, and qualifications of the person with overall responsibility for the AMG system, when used.

(3) The names, authority, and relevant experience of personnel directly responsible for operating the AMG equipment, when used.

(b) Contractor quality control plan.

Comply with Section 01 45 01 and describe procedures for checking, mechanical calibration, and maintenance of both survey and construction equipment. Include the frequency and types of checks performed.

Include a price breakdown by individual tasks when construction survey and staking is paid by the lump sum for use in making progress payments and price adjustments.

(c) Technology statement. A written statement that includes:

(1) The manufacturer, model, and software version of the AMG equipment, when used; and

(2) Certification that the final 3D data is compatible with the AMG equipment. Certification may be submitted in a written letter from an

RPLS.

PART 2 EXECUTION

2.1 GENERAL

Conform to the following:

(a) Personnel.

Provide a crew supervisor on the project whenever surveying and staking is in progress.

(b) Equipment.

Furnish survey instruments and supporting equipment capable of achieving the specified tolerances.

Construction equipment controlled with a Global Positioning System (GPS) and Robotic Total Station (RTS) machine guidance system may be used in the construction of subgrade, subbase, and base aggregate courses, or other construction operations when approved.

(c) Material.

Furnish acceptable tools and supplies of the type and quality suitable for roadway and highway survey work. Furnish stakes and hubs of sufficient length to provide a solid set in the ground, with sufficient surface area above ground, for necessary legible and durable markings.

Include staking activities in the construction schedule required under Section 01 32 01. Include the dates and sequence of each staking activity.

Unless otherwise directed, the Government will set horizontal control points, vertical control points, and will provide data for use in establishing control for completion of each element of the work.

Data relating to horizontal and vertical alignment, theoretical slope stake catch points, and other design data may be furnished. If furnished, reformatting and additional calculations may be required for the convenient use of the Government-furnished data. Provide immediate notification of apparent errors in the initial staking or in the Government-furnished data.

Record survey and measurement field data in an approved format. Submit as-staked data and corrections made to the Government-furnished survey data. Submit survey and measurement data at least weekly. Field data and supporting documentation become the property of the Government upon completion of the work.

Discuss and coordinate the following with the COR before surveying or staking:

(1) Surveying and staking methods;

(2) Stake marking;

(3) Grade control for courses of material;

(4) Referencing;

(5) Structure control;

(6) Field staking data;

(7) Localization of the GPS systems to the Government-established control points; and

(8) Other procedures and controls necessary for the work.

Do not start work until the project staking has been approved. Work started prior to staking approval may be rejected and will result in a delay due to the Contractor.

Preserve initial reference and control points. Notify the COR of missing control points or stakes at least 10 days before beginning construction. Unless otherwise directed, the Government will reestablish control points missing before the beginning of construction.

Acceptance of the construction staking does not relieve the Contractor of responsibility for correcting errors discovered during the work and for bearing additional costs associated with the error.

Maintain legibility of stake markings for the duration of the project or until notified in writing the stakes are no longer needed. Replace stakes if necessary to ensure markings are maintained.

Remove and dispose of flagging, paint, lath, stakes, and other staking material after the project is complete.

PART 3: METHODS AND TOLERANCES

3.1 SURVEY AND STAKING REQUIREMENTS

Perform survey, staking, recording of data, and calculations as necessary to construct the project from the initial layout to final completion. Survey and set stakes to the tolerances shown in Table 1. Reset stakes, refine 3D data, or both as many times as necessary to construct the work.

(a) Control points.

Relocate initial horizontal and vertical control points in conflict with construction to areas that will not be disturbed by construction operations. Furnish the coordinates, elevations, and supporting documentation for the relocated points before the initial points are disturbed. Set durable monuments for survey control that uniquely identify the points.

Furnish the GPS localization results at least 7 days before beginning construction layout survey work. The COR may order the GPS localization calibration and associated 3D model to be broken into two or more zones to maintain the localized relationship between control points and original ground.

(b) Centerline establishment.

Establish or reestablish centerline at roadway design cross-section locations and as necessary to construct the work. Reestablish the centerline when construction survey and staking work does not meet the tolerances.

(c) Original ground topographic verification.

Use an approved method to regenerate cross-section data in areas where theoretical and actual ground elevations do not meet a tolerance of plus or minus 0.5 feet (150 millimeters). Retake cross-section to verify existing ground topography to mapping. Submit cross-section or 3D data in electronic and printed format for approval. Reduce cross-sections to horizontal and vertical distances from centerline.

Retake cross-section 10 feet (3 meters) beyond catch points to verify existing ground topography.

(d) Slope and references stakes. Perform the following:

(1) Conventional survey methods.

Verify and set slope stakes on both sides of centerline at the theoretical catch point. If the theoretical catch point is not within a tolerance of 0.5 feet (150 millimeters), perform original ground topographic verification according to Subsection 3.1(c). Set the slope stake at the actual intersection of the design roadway slope with the natural ground-line. Set reference stakes outside the clearing limits.

Include reference points and slope-stake information on the reference stakes.

Establish slope stakes in the field as the actual point of intersection of the design roadway slope with the natural ground-line when theoretical catch point information is not available.

(2) AMG method.

After clearing operations are completed, set centerline reference stakes and hubs on both sides of centerline at 100-foot (30-meter) intervals at the clearing limit locations. Where clearing limits are greater than 10 feet (3 meters) vertically, 25 feet (8 meters) horizontally, or both from subgrade hinge point; provide an additional reference stake and hub as approved by the COR. Label each centerline reference stake with station, hub elevation, and offset from centerline.

Construct a 1000-foot (300-meter) long test section using AMG on the project at an approved location before beginning grading operations.

Select a test location with superelevation and curve widening transitions if applicable. Notify the COR 10 days before beginning the test section.

Demonstrate capability, knowledge, equipment, and experience to achieve work within tolerances. For roadway work, allow 14 days to evaluate the test section. Do not start full grading operations until the test section is approved.

Provide as-built cross-sections at random locations specified by the COR not to exceed 500-foot (150-meter) intervals. If as-built cross-sections do not meet the tolerances in Table 1; rework the section until the specified tolerances are achieved and provide additional cross-sections as directed by the COR, at no cost to the Government.

(e) Clearing and grubbing limits.

Set clearing and grubbing limits on both sides of centerline based on the actual slope-stake locations.

(f) Grade-finishing stakes.

(1) AMG method. Construct a 1000-foot (300-meter) long test section using AMG on the project at an approved location before beginning grading operations. Select a test location with superelevation and curve widening transitions, if applicable. Notify the COR 10 days before beginning the test section. Demonstrate the capability, knowledge, equipment, and experience to achieve work within tolerances. Allow 14 days to evaluate the test section. Do not start full grading operations until the test section is approved.

Verify the grade elevation and horizontal alignment of roadway grade-finishing operations. Use conventional survey methods at random locations specified by the COR, not to exceed 500-foot (150-meter) intervals. Submit 3D coordinates of grade-finishing quality control checks.

(2) Conventional survey methods. Set grade-finishing stakes for grade elevations and horizontal alignment, on centerline and on each shoulder at design roadway cross-section locations. Set stakes at the top of subgrade and the top of each aggregate course. Reset grade finishing stakes as many times as necessary to construct the subgrade and each aggregate course.

During turnout or pullout construction, set stakes on the centerline, on each normal shoulder, and on the shoulder of the turnout. In parking areas, set stakes at the center and along the edges of the parking area.

Set stakes in ditches to be paved.

When the centerline curve radius is less than or equal to 250 feet (75 meters), use a maximum longitudinal spacing between stakes of 25 feet (8 meters). When the centerline curve radius is greater than 250 feet (75 meters), use a maximum longitudinal spacing between stakes of 50 feet (15 meters). Use a maximum transverse spacing between stakes of 20 feet (6 meters). Use brushes or guard stakes at each stake.

(g) Culverts.

Verify and set culvert locations at the inlet, outlet, and inlet basin points according to the plans. Perform the following if culvert design does not fit field conditions:

(1) Survey and record the ground profile along the culvert centerline;

(2) Determine the slope catch points at the inlet and outlet;

(3) Set reference points and record information necessary to determine culvert length and end treatments;

(4) Plot to scale the profile along the culvert centerline. Show the natural ground, the flow line, the roadway section, and the culvert including end treatments and other appurtenances. Show elevations, grade, culvert length, and degree of elbow.

(a) For single skewed culverts, submit a plotted field-design cross-section normal to roadway centerline and at each end section. Plot the offset and elevation of natural ground at the end section and at proposed template break points between centerline and the end section.

Ensure the template design embankment slope is not exceeded;

(b) For multiple skewed culverts, submit a plotted field design cross-section normal to roadway centerline and at the end sections (left and right) nearest to the shoulder. Plot the offset and elevation of natural ground at the end section and at proposed template break points between centerline and the end section. Ensure the template design embankment slope is not exceeded;

(c) Submit the plotted field-design cross-section for approval of final culvert length and alignment. Plot at a clear and readable scale;

(d) Set inlet, outlet, and reference stakes when the field design has been approved. Stake inlet and outlet ditches to make sure the culvert and end treatments (such as drop inlets) are functional; and

(e) Adjust slope, reference, and clearing stakes as necessary to provide for culvert inlet treatments in cut slopes. Readjust slope, reference, and clearing stakes as necessary when culvert inlets are moved from their plan locations. Review slope adjustments with the CO and obtain approval.

(h) Bridges.

Set adequate horizontal and vertical control and reference points for bridge substructure and superstructure components. Establish and reference the bridge chord, bridge tangent, or control lines as specified on the bridge plans. Also establish and reference the centerline of each pier, bent, and abutment.

(i) Retaining walls and reinforced soil slopes.

Survey and record profile measurements along the face of the proposed wall or reinforced soil slope at 5 feet (1.5 meters) and 10 feet (3 meters) in front of the wall or slope face. Take cross-sections every 25 feet (8 meters) along the length of the wall or reinforced soil slope and at major breaks in terrain within the limits designated by the CO. Measure and record points every 25 feet (8 meters) and at major breaks in terrain for each cross-section. Set additional references and control points to perform the work.

(j) Borrow and waste sites.

Perform field work necessary for initial layout and measurement of the borrow or waste site. Establish site limits and clearing limits. Measure both original and final ground conditions and submit cross-sections as directed by the CO.

(k) Permanent monuments and markers.

Perform survey and staking work necessary to establish permanent monuments and markers as described in Section 621 or reestablish monuments as described in Subsection 107.02.

(l) Miscellaneous survey and staking.

Survey and stake other work (such as guardrail, curb and gutter, turf establishment, utilities, and excavation limits for structures) to the proper location and required tolerances. Propose staking increments for approval by the COR when not specified.

Table 1 Construction Survey and Staking Tolerances (1)

Staking Phase Horizontal Vertical

Control points set from existing Government control points

±0.03 feet (±10 millimeters)

±0.01 feet × N

(±3 millimeters × N )(2)

Mapping, topography, and cross-section points

±0.16 feet (±50 millimeters)

±0.16 feet (±50 millimeters)

Centerline points (3) including (PC), (PT), (POT),(POC), and references

±0.06 feet (±20 millimeters)

±0.06 feet (±20 millimeters)

Slope-stake and slope-stake references (4) ±0.16 feet (±50 millimeters)

±0.16 feet ±50 millimeters)

Culverts, ditches, and minor drainage structures stakes

±0.16 feet (±50 millimeters)

±0.06 feet (±20 millimeters)

Retaining walls stakes ±0.06 feet (±20 millimeters)

±0.03 feet (±10 millimeters)

Curb and gutter stakes ±0.06 feet (±20 millimeters)

±0.03 feet (±10 millimeters)

Bridge substructures stakes ±0.03 feet (±10 millimeters)(5)

±0.03 feet (±10 millimeters)

Bridge superstructures stakes ±0.03 feet (±10 millimeters)(5)

±0.03 feet (±10 millimeters)

Clearing and grubbing limit stakes ±1.00 feet (±300 millimeters)

Roadway subgrade finish stakes (6) ±0.16 feet (±50 millimeters)

±0.03 feet (±10 millimeters)

Roadway finish grade stakes (6) ±0.16 feet (±50 millimeters)

±0.03 feet (±10 millimeters)

(1) At statistical 95 percent confidence level. Tolerances are relative to existing Government control points.

(2) N is the number of instrument setups.

(3) Centerline points: PC - point of curve, PT - point of tangent, POT - point on tangent, POC - point on curve.

(4) Take the cross-sections normal to the centerline ±1 degree.

(5) Bridge control is established as a local network and the tolerances are relative to that network.

(6) Includes paved ditches.

PART 4: Measurement, Acceptance and Payment

4.1 Measurement & Payment

Construction survey and staking will be evaluated based on visual inspection of the work for compliance with the contract and prevailing industry standards.

Survey notes will be evaluated based on visual inspection of the work for compliance with the contract and prevailing industry standards.

(a) Measurement

Measure the pay items listed in the bid schedule according to Subsection

1.4 (b) and the following as applicable:

When measuring grade finishing, measure one time for the subgrade and one time for each aggregate course.

When measuring miscellaneous survey and staking paid by the hour; do not measure time spent in making preparations, traveling to and from the project site, performing calculations, plotting cross-sections and other data, processing computer data, and other efforts necessary to successfully accomplish construction survey and staking.

Do not measure re-establishing missing control points or stakes after construction operations have begun.

(b) Payment

The accepted quantities will be paid at the contract price per unit of measurement for the pay items listed in price breakdown. Payment will be full compensation for the work prescribed in this section.

Payment for lump sum pay items will be prorated based on the progress of the work under this section, according to the price breakdown required in this specification”?