Preparation of Subgrade. The Contractor shall remove loam and topsoil, loose vegetable matter, stumps, large roots, etc., from areas upon which embankments will be built or material will be placed for grading. The subgrade shall be shaped as indicated on the drawings and shall be so prepared by forking, furrowing, or plowing that the first layer of the new material placed thereon will be well bonded to it. Placing and Compacting Embankment Material. After the subgrade has been prepared as hereinbefore specified, the material shall be placed thereon and built up in successive layers until it has reached the required elevation. Layers shall not exceed 12 inches in thickness before compaction. In embankments at structures, the layers shall have a slight downward slope away from the structure; in other embankments the layers shall have a slight downward slope away from the center. In general, the finer and less previous materials shall be placed against the structures or in the center, and the coarser and more pervious materials, upon the outer parts of embankments. Each layer of material shall be compacted by the use of approved rollers or other approved means so as to secure a dense, stable, and thoroughly compacted mass. At such points as cannot be reached by mobile mechanical equipment, the materials shall be thoroughly compacted by the use of suitable power-driven tampers. Previously placed or new materials shall be moistened by sprinkling, if required, to ensure proper bond and compaction. No compacting shall be done when the material is too wet, from either rain or too great an application of water, to compact it properly; at such times the work shall be suspended until the previously placed and new materials have dried out sufficiently to permit proper compaction, or such other precautions shall be taken as may be necessary to obtain proper compaction. The portion of embankment constructed below proposed structures shall be compacted to 95 percent. The top two feet of an embankment below a pavement base shall be compacted to 95 percent. All other embankments shall be compacted to 90 percent.
Preparation of Subgrade. This work shall consist of constructing the sub-grade such that the finished line and grade will conform to the line and grade as shown on the plan or as directed by City staff. The subgrade will be compacted to a degree such that no noticeable deflection is apparent. Removal of unsuitable material and replacement with suitable material is the responsibility of the Contractor. The City staff will verify line, grade, and compaction prior to placement of any materials. Contractor will not proceed with placement of materials without authorization by City staff. CONCRETE SIDEWALK The Contractor shall construct 4” and/or 6” depth Portland Cement Concrete sidewalks as stated in the plans, in accordance with the typical section. Where space does not allow for a two-foot setback or where immovable objects restrict the width or location of the sidewalk, the contractor shall seek approval by the City prior to making adjustments in regard to the sidewalk width and/or location. Curb cut ramps shall be located at all intersections and driveways in accordance with GDOT and ADA requirements. In addition, ADA compliant detectable warning surfaces shall be used at the toe of the ramps. Curb cut ramps and detectable warning surfaces are incidental to the cost for the Portland cement concrete sidewalks. The detectable warning surfaces shall be the yellow fiberglass insert type and shall be at a minimum 2’ x 4’ in size. The detectable warning surfaces shall be considered incidental and no separate payment will be made. Also, the proposed sidewalk shall tie to the existing driveways in accordance with GDOT and ADA requirements. ADA ramps will be paid for at the contract unit price per SDY for sidewalk. This work shall consist of supplying, transporting, forming, placing, finishing, and curing Portland Cement Concrete as sidewalks at locations specified in this ITB. Concrete shall conform to the minimum requirements for Class “B” as specified by GDOT. Concrete shall be placed only when the air temperature is 40 degrees Fahrenheit and rising. Concrete will be protected from freezing for the first 24 hours. Appropriate levels of care will be employed by contractor to restrict public access to uncured concrete. Concrete will be broom finished, edged, and jointed. Concrete sidewalk construction will be performed in accordance with current GDOT specifications.
Preparation of Subgrade. This work shall consist of constructing the sub-grade such that the finished line and grade will conform to the line and grade as shown on the plan or as directed by City staff. The subgrade will be compacted to a degree such that no noticeable deflection is apparent. Removal of unsuitable material and replacement with suitable material is the responsibility of the Contractor. The City staff will verify line, grade, and compaction prior to placement of any materials. Contractor will not proceed with placement of materials without authorization by City staff.
Preparation of Subgrade. (i) Width of subgrade: This subgrade should be prepared to the required formation (see Clause 1170AR.1.b). It should be sufficiently wide to extend to the rear face of proposed edge restraints and abut existing structures.
Preparation of Subgrade. A. Subgrade of areas to be paved shall be re-compacted as required to bring top 8 inches of material immediately below aggregate base course to a compaction at optimum moisture of at least 95 percent of maximum density, as determined by ASTM D 1557. Subgrade compaction shall extend for a distance of at least 12 inches beyond pavement edge.
Preparation of Subgrade. The ground to be occupied by sidewalks, curbs and gutters shall be excavated or filled according to the elevations on the approved drawings to allow for the laying of gravel and concrete to the sections shown on the City of Woodstock standard drawings “Details of Sidewalks, Curbs and Gutters” attached to this specification. Irrespective of the amount of excavation or fill required, all topsoil and other soft material shall be stripped to its full depth from the areas to be occupied by sidewalks, curbs and/or gutters. The subgrade shall be thoroughly compacted by tamping and/or rolling to 95% of maximum density at optimum moisture as determined by the current
