203CLASS 1, CLASS 1A, AND CLASS 1C EXCAVATION

203.1DESCRIPTION—This work is excavation for roadways, roadway appurtenances, and structures. The

three classes of excavation include the following:

• Excavation as shown on the Standard Drawings, for roadways, shoulders, ditches, drainage structures, stream channels, grade separation structures, retaining walls, and wingwalls.

• Remove topsoil and topsoil mixture, as indicated or directed, and stockpile as specified in Section 801 before excavation operations.

• Excavation, as indicated or directed, for benches and for the removal of existing pavements not being rehabilitated.

• Excavation, as indicated or directed, for the removal of unsuitable material having a bottom width of 8 feet or more.

• Excavation, as indicated or directed, to allow for the placement of topsoil.

• Removal of unforeseen slides and rock ledges.

• Removal of stone fences, piles of dirt or stones, individual boulders, and any portions of structures above the natural ground, when in excess of 1/2 cubic yard volume.

subgrade having a bottom width of less than 8 feet, as indicated or directed. Includes draining the undercut, backfilling with AASHTO No. 1 aggregate, and placement of geotextiles as specified in Section 208.3(d).

subgrade having a bottom width of 8 feet or more, as indicated or directed. Includes draining the undercut, backfilling with AASHTO No. 1 aggregate, and placement of geotextiles as specified in Section 208.3(d).

203.3CONSTRUCTION—

wheel to neat lines as indicated or directed. Keep the excavation graded to drain , and seal with smooth - wheeled compaction equipment to prevent subgrade from becoming saturated. Seal the surface at the end of the workday to prevent conditions from deteriorating before work can proceed. Temporary drainage structures or channels may be required.

the excavation to the lines indicated, with the least disturbance to adjacent material, as specified in Section 207.

underlying base to a depth of 6 inches and recompact.

indicated to neat lines . Backfill with suitable material compacted as specified in Section 206.3(b) . If specified, use Type C or better, No. 2A or OGS as specified in Section 703.2.

cut, and remove existing pavement structure as indicated or directed.

satisfactory stability. Remove the material by a method that allows the revised slope lines to be neatly and acceptably trimmed to meet existing conditions. If a slide occurs, notify the Inspector-in-Charge immediately and cease operations in the slide area until directed to resume. Remove slide material and bench or flatten slopes, as directed, to obtain the planned width of roadway.

the slope lines indicated, without written authorization.

specified in Section 801, unless otherwise directed. Replace topsoil that is required on the project and wasted during excavation operations at no additional cost to the Department.

and shoring when no longer required, unless otherwise indicated or directed.

Pump or bail to remove water as necessary. Remove sheeting or bracing when no longer required, unless otherwise indicated or directed.

placement in embankment and for backfill. Replace suitable material (Section 206.2(a)2) that is required on the project and wasted during excavation operations at no additional cost to the Department.

areas obtained as specified in Section 105.14.

County Maintenance Facility or location approved by the Representative . If delivered to a Department Facility, notify and coordinate with the County Manager for delivery. Materials not claimed by the Department are the Contractor’s responsibility for disposal.

203.4MEASUREMENT AND PAYMENT—Cubic Yard

For the class of excavation indicated and as follows:

using the following methods:

project has been constructed as indicated and that the indicated quantities may only be used if the borrow section can be isolated.

Borrow Excavation that cannot be isolated, excavation will be measured. Measurement may also be requested, or the Representative may require measurement, if there is disagreement as to the accuracy of the indicated quantities. Cross-sectional measurements will be obtained by field survey or by photogrammetric methods. The original cross-sections will be used as the base cross -sections and the final cross-sections plotted thereon. Additional cross-sections may be interpolated at intermediate points, where necessary to determine the

quantities more accurately. The average end-area method, based on horizontal measurement, will be used to compute quantities. If the Representative or Contractor determines this method produces a considerable error, the Representative will use any other three-dimensional method that will keep the error to a minimum. Stone fences, piles of stone, and individual surface boulders, in excess of 1/2 cubic yard and not shown on the cross-sections, will be measured by a three-dimensional volume method. Measure the excavation by acceptable methods involving three -dimensional measurements where it is otherwise impractical to measure material by the cross -sectional method because of the erratic type or location of work.

Section 205.4(a) when widened excavation is used in place of borrow excavation, as shown on the Standard Drawings and accepted in writing. Excavating offsets for the convenience of drilling is incidental to the Class 1 Excavation.

completed as indicated. Cross -sections will be obtained, and the quantities computed, using the method specified in Section 203.4(a)2 when the excavation is satisfactory. These quantities will be used as the basis for current and final payments. Clearing and grubbing required to make such measurements is incidental to stream channel excavation.

template, when directed, as specified in Section 110.03.

When directed or indicated, s aw cutting will be paid by the Linear Foot. Removal of pavements to neat lines by a milling method will be incidental to the class of excavation and will not be considered a significant change in character as specified in Section 110.02(d).