Perform survey for construction projects under one of the
following four categories:
A.
Monument Preservation: preserving existing
monuments (section corners).
B.
Control Point Survey: preserving existing
control points and/or reestablishing missing control points for roadway
alignments.
C.
ROW Survey: locating existing or
proposed ROW lines for projects.
D.
Construction Location Survey:
surveying and staking work necessary for construction of the project that is
not covered under monument preservation, control point preservation or row
survey.
None.
A.
General.
1.
Ensure all survey work is completed by a Professional
Engineer licensed in the State of Iowa in responsible charge or a Professional
Land Surveyor licensed in the State of Iowa in responsible charge, according to
the provisions of Iowa Code 542B. Submit a resume to the Engineer identifying
the field survey personnel and their capabilities to perform the intended
requirements.
2.
If, in the opinion of the Engineer, the Contractor has
destroyed or disturbed any of the original survey stakes or benchmarks, the
cost of replacing will be charged to the Contractor. Bring design errors
discovered to the Engineer's attention for review prior to staking.
3. All survey work documentation becomes the property of the Contracting Authority. Assemble required documentation into a single electronic package upon completion of the project and furnish to the Engineer. The work of this specification will be considered complete when the following documentation is furnished to and accepted by the Engineer:
a. ASCII comma-delimited file of the coordinates formatted as: point number, northing, easting, elevation, and feature code (using the feature code list found in the Design Manual chapter 40B-1) with point description (a brief description of what was found or set). Identify coordinate system used.
b. Recorded copy(ies) of any filed Monument Preservation Certificate(s).
c. Recorded copy(ies) of any filed US Public Land Survey Corner Certificate(s).
d. Secondary control monument coordinates including traverse check.
e. Reference monument drawings.
f. Benchmark coordinates.
g. Required DTMs.
h. Bridge and box culvert staking diagrams.
i.
Final profile grades.
4.
For the purpose of subcontracting, these items will be
considered a specialty item.
B.
Monument Preservation.
1.
Ensure monument preservation work is completed by a
Professional Land Surveyor licensed in the State of Iowa in responsible charge,
according to the provisions of Iowa Code 542B.
2.
Preserve any existing survey monuments including right of
way monuments, lot/property corners, centerline control, and section corners
that are disturbed as a result of construction activities., This work shall be
completed as required by Iowa Code 355.11 and 355.6A.
3.
Survey monuments, ROW monuments, or section corners
located on the project that are not disturbed by construction activity do not
need to be preserved; however, they should be protected from damage during
construction.
4.
After construction, replace all disturbed survey
monumentation with a reasonably permanent material solidly embedded in the
pavement/ground. The surveyor shall affix a cap (or washer in the pavement) of
reasonably inert material bearing an embossed or stencil cut marking of the
Iowa registration number of the Land Surveyor completing the work. Other types
of monumentation could be used (such as a cut “X” in the pavement) with the
written consent of the contracting authority.
C.
Control Point Network.
1. Primary Control Points.
A primary control point is
a survey point the Contracting Authority establishes prior to project
commencement. The point will be established by placing a control point marker
in the ground.
2. Secondary Control Points.
A secondary control point is a survey point the Contractor establishes on grading or other projects specified in the plans and preserves on all other projects.
a. The Engineer will provide control point markers, similar to those the Department uses for GPS control.
b. Place secondary permanent horizontal control point markers, under the Engineer’s direction, at locations likely to survive project construction and at intervals not to exceed 2640 feet. Place the control point marker in the ground along the project corridor. Place at higher elevations along the corridor to provide a view of the immediate project topography and to provide for visible clear line of sight to the nearest secondary permanent control monument in either direction. Primary project markers may be substituted if appropriate.
c. Plant secondary control point markers 1 to 4 inches below existing ground. Drive a metal fence post within 1 foot of the control point to mark its location. When the control point is near the ROW line the marker shall be placed in the ROW.
d. Carefully determine project coordinates relative to the nearest primary project control markers using project coordinate values the Engineer has provided. Ensure the resulting error radius of the secondary control point marker does not exceed 0.10 feet ±2 ppm relative to the primary control.
e. Perform an independent traverse check between the secondary control point markers by observing distance and angular measurements or by use of GPS. Provide the Engineer with a diagram indicating horizontal ground distances to nearest 0.01 foot and angles to at least the nearest 10 seconds between each secondary control point marker. Ensure inverses between the coordinate pairs as determined in the previous paragraph do not exceed 0.10 feet of the direct measurements.
f.
Replace secondary control point markers disturbed during
construction activities using procedures outlined above, at no additional cost
to the Contracting Authority.
3. Alignments.
Obtain the Engineer’s
approval for the method of determining alignments and elevations and the method
of preserving control points. This approval does not act to relieve the
Contractor of the responsibility for the correctness of the survey work. Do not
use plan cross-sections for vertical or horizontal control.
4. Benchmarks.
a. Establish permanent vertical control benchmarks at all bridges and reinforced concrete box culverts within the project. Use an Iowa DOT brass plug on bridge barrier rail or headwall of reinforced concrete box culvert to indicate the benchmark. If the Engineer approves, a sawn “X” on bridge barrier rail or headwall of reinforced concrete box culvert may be used.
b. Transfer all benchmark elevations from construction plan benchmarks to the permanent benchmarks using the three-wire method or by trigonometric leveling. Use temporary benchmarks of reasonable stability to preserve the plan benchmarks.
c.
Ensure benchmark level loops do not exceed an error of
0.05 feet times the square root of the loop’s length in miles. Distribute the
error equally along the loop on all intermediate traverse/benchmark points.
D.
ROW Survey.
1.
On projects with new proposed ROW, Temporary Easement, or
where existing ROW is to be reestablished.
2. All permanent monumentation will need to be placed in the ground. On projects with new ROW, monumentation is not to be placed until all ROW has been purchased.
a. A comma delineated ASCII point coordinate list will be provided by the contracting authority. The coordinate basis will be defined and provided by the Contracting Authority. The file format will be as follows:
· Point Number,
· Northing,
· Easting,
· Elevation,
· Feature Code and
· Description of what was found or set. (if applicable)
b. A 5/8 inch by 40 inch steel re-rod with an Iowa DOT aluminum cap or an equivalent land surveyors cap that includes their PLS number will be set as the right of way monumentation.
c. A green steel post with a “ROW” sign will be set within the new right of way, no more than a foot away from the right of way point. (Materials will be provided by the contracting authority.)
d. A check shot will be taken on the set monumentation to acquire a set of coordinates that will have the same coordinate basis as what was provided in number one as well as have the file format as follows:
· Point Number,
· Northing,
· Easting,
· Elevation,
· Feature Code, and
· Description of what was set.
e. A feature code of “ROW” will be used.
f. The ASCII point list, of the checked points, will be provided to the contracting authority.
g.
Submit required documentation per Article 2526.03, A, 3.
E.
Construction Location Survey.
1.
Furnish all survey necessary for construction of the
project before work begins in the area. Comply with Iowa Code requirements
under the direct supervision of an Iowa licensed land surveyor. Do not apply
the provisions of Article 1105.14 to this work, except to preserve the
original stakes set by the Engineer. Refer to Article
1105.15 for requirements when AMG is utilized. Construction
location survey includes qualified personnel, equipment, and supplies required
for, but not limited to, the following items:
2. Grading.
a. General.
· Survey right-of-way line between permanent right-of-way corners at 100 foot intervals, or less if needed, including borrows, temporary easements, and right of entry. Mark these points by placement of a metal pin or wood hub, flat, and lath at the same location as the slope stakes. Clearly mark the flat with the station number, distance from centerline, and elevation (cut or fill) to subgrade.
·
Take existing and final elevations of all borrows.
Provide existing and final digital terrain model (DTM) in LandXML format,
suitable for use by the Engineer to calculate excavation quantities.
· Set bridge berm slope stakes to establish all transitions, including the face of the berm. Set finish grade stakes (blue tops) on all roadway shoulder lines and roadway centerlines to project down the face of the bridge berm at the top, face of berm bench, and toe.
· When Class 12 excavation is an item, provide existing and final DTM in LandXML format for use by the Engineer to calculate the excavation quantities.
· Use a lath to locate on each side of roadway at the right-of-way line, agricultural drain tile shown in the contract documents. Clearly mark lath to show station location, distance from centerline, tile size and type, and flowline elevation.
· Establish benchmarks in the adjacent area before installing settlement plates in accordance with Article 2526.03, C, 4. Locate and determine elevations of settlement plates daily during construction and weekly during delays and following the completion of embankment construction, unless approved otherwise by the Engineer. Submit elevations to the Engineer on Settlement Plate Data Form (available at the Bureau of Construction and Materials website).
· Check tie-ins with existing roadways for correctness of alignment prior to construction staking.
b. Areas Constructed Without AMG.
· Set slope stakes at 100 foot intervals, or less if needed, for embankment and excavation work including roadway, channel changes, and borrow areas. Interpolations may be necessary to match cross-sections. Set stakes at toe of foreslope or top of backslope, or both. Mark slope stakes with a flat and lath. Clearly mark flat with station location, distance, slope, and cut or fill information.
· Set grade check stakes at 100 foot intervals for bottoms of subgrade treatments. Set stakes on centerline for two-lane roads and in median for four-lane roads. Mark grade check stakes with a lath. Clearly mark lath with station location and cut or fill information.
· Set finish grade stakes (blue tops) at 100 foot intervals, or less if needed. Set blue tops at each shoulder line and each point where there is a change in cross slope. Mark blue tops with a wood hub and stake chaser or similar type tassel.
c. Areas Constructed with AMG.
· Establish elevation of secondary control points using differential leveling from project benchmarks, forming closed loops. Provide a copy of new control point information to Engineer prior to construction work. Contractor is responsible for errors resulting from their efforts. Correct deficiencies to the satisfaction of the Engineer at no additional cost to Contracting Authority.
· Set hubs at top of finished subgrade at hinge points on cross section at 1000 foot intervals on mainline and at least two cross sections on side roads and ramps. Establish these hubs, using means other than the machine guidance surface (such as plan typicals and cross sections, for use by Engineer to check accuracy of construction.
·
Provide grade stakes at critical transition points such
as, but not limited to, PC’s, PT’s, super elevation transition points, and
other critical points required for construction of drainage and roadway
structures.
3. Bridges.
a. Provide surveying and staking as appropriate to control the geometry of the work. Mark centerline of the approach roadway, centerline of the substructure units, and other points as necessary to establish the location, elevation and alignment of the structure.
b. Mark locations and elevations with metal pin or tack in a wood hub, flat, and lath. Clearly mark flat with the pier/abutment station location, design number, and offset distance from centerline of the approach roadway.
c. When a test pile, test shaft, or demonstration shaft is specified in the contract documents, mark the location with a wood hub.
d. Establish a minimum of three temporary benchmarks.
e. Perform an independent check of the above stakes. Independent check shall be performed using independent crew, calculations, equipment and/or methodology as necessary to validate the accuracy of the surveyed lines and stakes, without reuse of calculations, equipment setup, or data acquisition from the original survey.
f. Submit a staking diagram, accompanied by results of the original and independent check, to the Engineer prior to starting structure construction. The information shall be submitted in electronic (PDF) format and shall include:
· Dimensioned, graphical depiction of surveyed lines and stakes.
· Raw data and calculations from the original and check survey. Identify date/time, crew, equipment, datum and coordinate system, and primary controls used.
g. When the construction work and associated construction survey will be completed in separate phases, submit an updated staking diagram and independent check of new or relocated stakes, prior to each phase of work.
· Location, orientation, and elevation of each separate spread footing, pile footing, pile cap, and/or drilled shaft. Submit to the Engineer as excavated and/or as formed, prior to concrete placement within the respective substructure element.
· Elevation of substructure beam seats, as built. Submit to the Engineer prior to installation of bearings and superstructure elements.
· Top of beam elevations, as erected. Locations for determining top of beam elevations shall be in accordance with the design plans. Tabulate top of beam elevations in Excel spreadsheet format and provide comparison against intended/allowed plan geometry. Identify needs for deck grade adjustments, if discrepancies arise. Submit proposed final deck grades to the Engineer for acceptance
i.
For bridges on Primary and Interstate routes, the
required beam seat elevations and top of beam elevations shall be tabulated and
submitted to the Engineer on the bridge e-File spreadsheet provided with the
contract documents.
4. Reinforced Concrete Box Culverts.
a. Provide surveying and staking as necessary to establish the location, elevation and alignment of the structure and flow line.
b. Mark locations and elevations with metal pin or tack in a wood hub, flat, and lath. Clearly mark flat with the station location, design number, cut/fill elevation and offset distance from centerline of the approach roadway and back of parapet.
c. Perform an independent check of the above stakes. Independent check shall be performed using independent crew, calculations, equipment and/or methodology as necessary to validate the accuracy of the surveyed lines and stakes, without reuse of calculations, equipment setup, or data acquisition from the original survey.
d. Submit a staking diagram, accompanied by results of the original and independent check, to the Engineer prior to starting structure construction. The information shall be submitted in electronic (PDF) format and shall include:
· Dimensioned, graphical depiction of surveyed lines and stakes.
· Raw data and calculations from the original and check survey. Identify date/time, crew, equipment, coordinate system, and primary controls used.
e. When the construction work and associated construction survey will be completed in separate phases, submit an updated staking diagram and independent check of new or relocated stakes, prior to each phase of work.
f.
Report to the Engineer questionable flow lines and
alignments that do not match existing drainage.
5. Pipe Culverts.
a. Mark locations and elevations with metal pin or a wood hub, flat, and lath. Clearly mark the flat with the station location, cut/fill elevation, and offset distance to both ends or centerline of pipe.
b.
Report to the Engineer questionable flow lines and
alignments that do not match existing drainage.
6. Sanitary and Storm Sewers.
Mark locations and
elevations with metal pin or tack in a wood hub, flat, and lath. Clearly mark
the flat with the station location, pipe number, cut/fill elevation, and offset
distance to centerline of pipe.
7. Water Mains.
Mark locations and
elevations with metal pin or tack in a wood hub, flat, and lath. Clearly mark
the flat with the station location, pipe number, cut/fill elevation, and offset
distance to centerline of pipe.
8. Intakes and Utility Accesses.
Mark locations and
elevations with metal pin or tack in a wood hub, flat, and lath. Clearly mark
the flat with the station location, intake or utility access number, cut/fill
elevation (including bottom of well and form grade), and offset distance to the
Station Location.
9. Pavements (PCC & HMA).
a. General.
1) On PCC, PCC overlays, and HMA projects, when a proposed design profile grade is included in the contract documents.
a) Obtain elevations of adjacent pavement and bridges at centerline, edge of pavement, and other locations necessary to characterize existing profile and cross slope. Obtain elevations at maximum 10 foot intervals for a minimum of 100 feet
b) Adjust proposed design profile grade and cross slope to provide a smooth transition, free of bumps and dips, from the new pavement to the existing pavement or bridge. Submit final profile to the Engineer for approval before paving begins.
2) For full depth PCC and HMA pavements, when a proposed design profile grade is not included in the contract documents:
a) Obtain elevations of the existing pavement and bridges at 100 foot intervals on straight and level sections and 50 foot intervals on horizontal and vertical curves.
b) Using these elevations, design a profile grade and cross slopes to provide a smooth transition, free of bumps and dips, from the new pavement to the existing pavement or bridge. Design a smooth profile grade line to provide the required pavement or shoulder thickness as detailed in the contract documents. Submit final profile to the Engineer for approval before paving begins.
3) For PCC overlays, when a proposed design profile grade is not included in the contract documents:
a) Obtain elevations of existing pavement at centerline and both pavement edges for bonded overlays and projects including mainline stress relief course and/or pavement scarification.
b) Obtain elevations of existing pavement at centerline, quarter points, and both pavement edges for unbonded overlays and whitetopping projects when a stress relief course and/or pavement scarification are not included.
c) Obtain elevations at maximum 50 foot intervals on straight and level sections and at maximum 25 foot intervals on horizontal and vertical curves.
d) Using these elevations, design a profile grade and cross slopes to provide a smooth transition, free of bumps and dips, from the new pavement to the existing pavement or bridge. Design a smooth profile grade line to provide the required pavement or shoulder thickness as detailed in the contract documents. Submit final profile to the Engineer for approval before paving begins.
b. Areas Constructed Without AMG.
Mark locations and elevations with metal pin or tack in wood hub (only tack one side), flat, and lath. Mark elevations on both sides of pavement at 50 foot intervals on straight and level sections and 25 foot intervals on horizontal and vertical curves. Clearly mark flat with station location, cut or fill information, and offset distance to edge of pavement. Include pavement cross slope information in superelevated curves.
c. Areas Constructed With AMG.
·
Mark with lath at A, A’, B, C, C’, and D
points along superelevated curve transitions and at station equation locations.
Additional paving hubs will not be required for mainline pavement.
10. Structural Walls.
a. Survey requirements for structural walls shall apply to the following work types:
· Mechanically Stabilized Earth (MSE) Walls.
· Cast in Place (CIP) Retaining Walls.
· Soil Nail Walls.
· Tie Back Walls.
· Noise Walls.
· Modular Block Retaining Walls.
· Segmental Retaining Walls.
b. Provide surveying and staking as necessary to establish the location, elevation and alignment of the structure.
c.
Mark locations and elevations with a metal pin or a wood
hub, flat, and lath. Clearly mark the flat with the station location, cut/fill
elevation, and offset distance to face of wall.
F.
Check tie-ins with existing roadways for correctness of
alignment prior to construction staking.
None. Lump sum items.
A. Payment for the following items will be paid for at the lump sum contract price:
· Construction Survey, Monument Preservation.
· Construction Survey, Control Point Survey.
· Construction Survey, Right of Way.
·
Construction Survey, Location Survey.
B.
Payment is full compensation for the survey work required
for the project as let, including any interpolations that may be necessary
between cross-section and field staking.
C.
Delivery of all documents electronic and other will be
required before final payment in made.
D.
Payment for revisions after the letting will be paid for
according to Article 1109.03, B.
E.
Verifying form work slopes according to Article
2511.03, B, 1, b, shall be incidental to Construction Survey and will not
be paid for separately.
F. Recorded copies of monument preservation and/or corner certificates will need to be provided to the Engineer before full payment is made.