This term shall consist of all grading above or below subgrade elevations, of whatever nature, required to bring the street to the proper subgrade elevation, including necessary excavation for curb, gutter, sidewalk, construction of embankments, excavation and proper sloping of all cuts, and other work incidental thereto.
1.1 EXCAVATIONS: All excavations shall be made to approximate subgrade elevations and shall be true to grade. Material below subgrade elevation in cuts shall not be loosened by plowing or other methods during the progress of the work.
1.2 EXCAVATION BELOW SUBGRADE: Whenever excavation below subgrade elevation to remove spongy material, vegetable matter, or other material is ordered by the Planning Commission, or its duly authorized representative, the contractor shall remove same in a satisfactory manner acceptable to the Planning Commission, or its duly authorized representative, and shall replace it with satisfactory material in layers not to exceed six inches in thickness and shall thoroughly compact each layer before the next layer is placed.
1.3 CONSTRUCTION OF EMBANKMENTS: Top soil shall be removed to eliminate all vegetation from the area upon which embankment is to be constructed. Soil so removed may not be used in construction of embankment.
Embankment shall be constructed, of approved materials, to approximate subgrade elevation in layers not to exceed six inches in thickness and extending the full width of the embankment. Each layer shall be compacted to not less than 95% of the density determined from the "Test for Moisture- Density Relationship" (AASHO Designation T-99), unless otherwise directed by the Planning Commission, or its duly authorized representative, before the next layer is placed.
1.4 SUBGRADE PREPARATION: The subgrade shall be in a moist condition at the time the concrete is placed. It shall be thoroughly wetted a sufficient time in advance of the placing of the concrete to insure that there will be no puddles or pockets of mud when the concrete is placed. The subgrade, however, shall not be allowed to dry out before the concrete is placed.
The subgrade soils shall be of uniform material and density to provide for satisfactory pavement performance. Soft spots that show up during construction should be excavated and re-compacted with the same type of material as found in the adjacent subgrade. Uni form support cannot be obtained merely by dumping extra granular material on the soft spot. With a uniform subgrade, excessive shrink and swell of expansive soils shall be prevented by adequate moisture and density controls during compactions. The compaction of expansive soil to a density of not less than 95% of the density determined from the "Test for Moisture-Density Relationship" (AASHO Designation T-99) will effectively control shrinking and swelling during periods of dry weather, providing the subgrade is not allowed to dry before the pavement is constructed. Concurrent with compaction, the subgrade shall be shaped to plan elevation, grade, and cross section. Special care shall be taken in compacting the backfill of sewers, drainage facilities, and other permanent structures that may be in the paved area.
Immediately prior to placing the concrete, the subgrade shall be tested for conformity with the cross section shown on the plans by means of an approved template riding on the side forms. If necessary, material shall be removed or added, as required, to bring all portions of the subgrade to the correct elevation. It shall then be thoroughly compacted and again tested with the template. Concrete shall not be placed on any portion of the subgrade which has not been tested for correct elevation. The subgrade should also be cleared of any loose material which may have fallen upon it.
1.5 EQUIPMENT FOR COMPACTION OF EMBANKMENT AND SUBGRADE: Any compaction equipment capable of uniformly producing the required embankment and subgrade densities, without lamination of, or within, successive layers, will be permitted by the Planning Commission, or its duly authorized representative. All compaction equipment shall be in good condition and shall be operated efficiently to assure uniform compaction.
1.6 SUBGRADE FOR CURBS, GUTTERS, SIDEWALKS AND DRIVEWAYS: Subgrade areas to be occupied by curbs, gutters, sidewalks and driveways shall be excavated, backfilled, as required, and compacted to establish grade. This work shall be done with particular care in accordance with all requirements herein.
1.7 EXCESS EXCAVATION: Excavated material, that is not suitable for or required for the construction of embankments, or the backfilling of excavations from which unsuitable material has been removed, shall belong to and be disposed of by the contractor. The con tractor shall not deposit excess material on private property.
1.8 BORROW MATERIAL: If sufficient soil of approved quality is not available on the construction site for replacing unsuitable material excavated and removed, or for embankment construction, the contractor shall obtain and supply suitable borrow soil for such construction.
1.9 SUBBASE: Subbase may be required for streets that carry large numbers of heavy trucks. When subbases are required, they shall be constructed with same care used in the design and placing of the concrete pavement.
1.10 EQUIPMENT OPERATED ON THE STREETS: The contractor shall be permitted to operate only pneumatic-tired equipment over any paved street surfaces and shall be responsible for correction of any damage to street surfaces in any manner resulting from the contractor's operations.
1.11 PROTECTION OF UTILITY LINES: The contractor shall at all times take proper precautions for the protection of utility lines, the presence of which are known, or can be determined by the examination of appropriate maps of the utility companies and the city. The contractor shall be financially responsible for the repair of any damage to such service lines.
1.12 PROTECTION OF MISCELLANEOUS PUBLIC AND PRIVATE INSTALLATIONS: The contractor shall at all times take proper precautions for the protection of and replacement or restoration of driveway culverts, street intersections, culverts or aprons, mail boxes, driveway approaches, and all other public and private installations that may be encountered during construction. Written approval for complete replacement or restoration work may be required by the Planning Commission, or its duly authorized representative.
(Ord. 1971-2, passed 4-6-71)