1-05.4	Conformity With and Deviations from Plans and Stakes 

Delete the fourth through seventh paragraph of this section and add the following new subsection:

(December 10, 2020  APWA GSP, Option 3)
1-05.4(1) Contracting Agency Provided Construction Staking

1-05.4(1)A  General
As used in this Section 1-05.4, the words, “stake,” “mark,” “marker,” or “monument” will be deemed to include any kind of survey marking, whether or not set by the Contracting Agency.

1-05.4(1)B  Control Stakes
The Engineer will supply construction stakes and marks establishing lines, slopes and grades in accordance with this Section of these Special Provisions. The Contractor shall assume full responsibility for detailed dimensions, elevations, and excavation slopes measured from these Engineer furnished stakes and marks.

A claim by the Contractor for extra compensation by reason of alterations or reconstruction work allegedly due to error in the Engineer’s line and grade will not be allowed unless the original control points set by the Engineer still exist, or unless the Contractor can provide other satisfactory substantiating evidence to prove the error was caused by incorrect Engineer furnished survey data. Three consecutive points set on line or grade shall be the minimum points used to determine any variation from a straight line or grade. Any such variation shall, upon discovery, be reported to the Engineer.

The Contractor shall provide a work site clear of equipment, stockpiles and obstructions which has been prepared and maintained to permit construction staking to proceed in a safe and orderly manner. The Engineer will stake a finite amount of work in a single day in accordance with Section 1-05.4(1)C of these Special Provisions.

Stakes that constitute reference points for all construction work will be conspicuously marked with an appropriate color of flagging tape. It will be the responsibility of the Contractor to inform its employees and subcontractors of the importance and necessity to preserve the stakes.

1-05.4(1)C Survey Requests
It shall be the Contractor’s responsibility to properly schedule survey work and coordinate staking requests with construction activities. The Engineer may be reasonably expected to stake any one of the following items, in the quantity shown, in a single day:

Roadway grading 		+/-1500 lineal feet of centerline
Storm or sanitary sewer 	Approximately 8-10 structures
Water main 			+/-1500 lineal feet of pipe
Curb and gutter 			+/-1300 lineal feet (one side only)
Base and top course		+/-1000 lineal feet of centerline
Slope staking 			+/-800-1200 lineal feet (top and toe)
Illumination/signalization 	Approximately 15-20 structures
$$1$$
$$2$$

Actual quantities may vary based on the complexity of the project, line of sight considerations, traffic interference, properly prepared work site, and other items that could affect production.

The Contractor shall be aware that length does not always translate directly into stationing. For example, a survey request for storm sewer pipe from Station 3+00 to 8+00 is 500 lineal feet in length. There may be 1000 lineal feet, or more, of storm sewer pipe, if the pipe is placed on both sides of the roadway and interconnected.

The Contractor shall provide staking requests at least three (3) working days before the Engineer needs to begin the staking operation.  If the work site is obstructed so that survey work cannot be done, a new survey request shall be submitted by the Contractor so that the survey work can be rescheduled once the site is properly prepared.  An additional 3 working days may be required to complete the rescheduled work.

The Contractor shall work to preserve stakes and marks set by the Engineer.  The Contracting Agency will deduct from payments due the Contractor all costs to replace such stakes, marks, carelessly or willfully damaged or destroyed by the Contractor’s operation.  A new survey request shall be submitted by the Contractor to replace the damaged or destroyed stakes.  An additional 3 working days may be required to complete the request.

If the removal of a control stake or monument is required by the construction operations of the Contractor or its subcontractors, and advance notice of at least three (3) working days is given to the Engineer, the Engineer will reference, remove, and later replace the stakes at no cost to the Contractor.

The Contractor is not entitled to an extension of time, as provided for in Section 1-08.8 as a result of any replacement of control stakes.

1-05.4(1)D Staking Services
The Contractor shall determine appropriate construction stake offset distances to prevent damage to stakes by its construction equipment.

The Engineer shall furnish to the Contractor, one time only, all principal lines, grades and measurements the Engineer deems necessary for completion of the work. These shall generally consist of one initial set of:

1.	Cut or fill stakes for establishing grade and embankments,
2.	Curb or gutter grade stakes,
3.	Centerline finish grade stakes for pavement sections wider than 25 feet as set forth in Section 1-05.5(5), subsection 2, and
4.	Offset points to establish line and grade for underground utilities such as water, sewers, storm drains, illumination and signalization.

No intermediate stakes shall be provided between curb grade and centerline stakes.

The Contractor shall provide enough safe areas to permit the Engineer to set those points and elevations that are the responsibility of the Contracting Agency and to perform random checks of the surveying performed by the Contractor.

Roadway and Utility Surveys
The County will furnish the following stakes and reference marks:

•	Clearing Limits - One set of clearing limit stakes will be set at approximately 50-foot stations or as needed.
•	Rough Grading - One set of rough grade stakes will be set along the construction centerline of streets at 50-foot stations as required. (If superelevations require intermediate stakes along vertical curves, the County will provide staking at closer intervals.) One set of primary cut and fill stakes will be set for site work. One set of secondary final grade cut and fill stakes will be set where deemed applicable as determined by the Engineer.
•	Storm Sewers - Two cut or fill stakes for each inlet, catch basin or manhole will be set at appropriate offsets to the center of the structure. After installation and backfill, inverts will be checked for correctness.
•	Sanitary Sewers - Two cut or fill stakes for each manhole or cleanout location will be set at appropriate offsets to the center of the structure. After installation and backfill, inverts will be checked for correctness.
•	Water Main - One set of line stakes will be furnished for water mains at 50-foot stations. Additionally, two reference stakes for each valve, hydrant, tee and angle point location will be set concurrently with these line stakes.
•	Staking for Embankments - Catch points and one-line stake will be set in those cases where the vertical difference in elevation from the construction centerline to the toe or top of a cut or fill slope exceeds 3 feet. In all other areas, stakes shall be set at an appropriate offset to the street centerline to allow for the preservation of said offsets through the rough grading phase. In both cases the stakes shall be clearly marked with appropriate information necessary to complete the rough grading phase.
•	Curb and Gutters - One set of curb and gutter stakes shall be set at an appropriate offset at 25-foot intervals, beginning and end points of curves and curb returns, wheelchair ramps, driveways, and sufficient mid-curve points to establish proper alignment.
•	Base and Top Course - One set of final construction centerline grade hubs will be set for each course, at not less than 50-foot stations. No intermediate stakes shall be provided unless superelevations require them. In those circumstances, one grade hub left and right of construction centerline at the transition stations will be set at an appropriate offset to centerline not less than 25-foot stations.
•	Adjacent or Adjoining Wetlands - One set of stakes delineating adjacent wetland perimeters will be set at 25 to 50-foot stations as required.
•	Illumination and Traffic Signals System - One set of stakes for luminaires  and traffic signal pole foundations will be set as required. One set of stakes for vaults, junction boxes, and conduits will be set, only if curb and gutter is not in place at the time of the survey request. If curb and gutter is in place, staking for vaults, junction boxes, and conduits will be provided at an additional expense to the Contractor.

When deemed appropriate by the Engineer, cut sheets will be supplied for curb, storm, sanitary sewer and water lines. Cuts or fills may be marked on the surveyed points but should not be relied on as accurate until a completed cut sheet is supplied.

The Contractor is responsible for staking all other items deemed necessary to construct the project per the Plans and Specifications.  All costs associated with Contractor staking shall be incidental to the Work and be included in the Contract unit prices.

Structure Survey
The Engineer is responsible for setting all alignment stakes, slope stakes, and grades necessary for the construction of bridges, noise walls, and retaining walls.  The Contractor shall maintain stakes set for construction and maintain the necessary lines and grades.

The survey work by the Engineer will include but not be limited to the following:

•	Establish, by placing hubs and/or marked stakes, the location with offsets of foundation shafts and piles.
•	Establish offsets to footing centerline of bearing for structure excavation.
•	Establish offsets to footing centerline of bearing for footing forms.
•	Establish wing wall, retaining wall, and noise wall horizontal alignment.
•	Establish retaining wall top of wall profile grade.
•	Establish elevation benchmarks for all substructure formwork.
•	Check elevations at top of footing concrete line inside footing formwork immediately prior to concrete placement.
•	Check column location and pier centerline of bearing at top of footing immediately prior to concrete placement.
•	Establish location and plumbness of column forms and monitor column plumbness during concrete placement.
•	Establish pier cap and crossbeam top and bottom elevations and centerline of bearing.
•	Check pier cap and crossbeam top and bottom elevations and centerline of bearing prior to and during concrete placement.
•	Establish grout pad locations and elevations.
•	Establish structure bearing locations and elevations, including locations of anchor bolt assemblies.
•	Establish box girder bottom slab grades and locations.
•	Establish girder and/or web wall profiles and locations.
•	Establish diaphragm locations and centerline of bearing.
•	Establish roadway slab alignment, grades and provide dimensions from top of girder to top of roadway slab.  Set elevations for deck paving machine rails.
•	Establish traffic barrier and curb profile.
•	Profile all girders prior to the placement of any deadload or construction live load that may affect the girder's profile.

1-05.4(1)E  Monuments
The Contractor shall work to preserve the existing monumentation as provided in RCW 58.09.130 and WAC 332-120. The Contractor shall notify the Engineer immediately if it becomes apparent that a survey marker will be disturbed due to construction. The Contractor shall allow ample time for the Engineer to acquire adequate information so that the monument may be replaced in its original position after construction.