1.1 DESCRIPTION: This item shall consist of all grading above or below subgrade elevation, of whatever nature, required to bring the street to the proper subgrade elevation, including necessary excavation for curb, gutter, sidewalk and alley intersections, construction of embankments, excavation, and proper sloping of all cuts, and other work incidental thereto,
1.2 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 process of the work. No excavation shall be made below subgrade elevation except to remove a spongy material, vegetable matter, or other material as ordered or approved by the Planning Commission, or its duly authorized representative. In the event the contractor does excavate any other area below subgrade elevation, he shall replace the excavated material with satisfactory material and shall thoroughly compact same.
1.3 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 the same to the satisfaction of 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.
1.4 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 99% 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.
1.5 CONSTRUCTION OF SUBGRADE: Subgrade is defined as the six-inch layer of soil immediately below the plan subgrade elevation, grade, and cross section. After completion of excavation and/or embankment to approximate subgrade elevation, grade, and cross section, the subgrade shall, upon direction of the Planning Commission, or its duly authorized representative, be scarified to a depth of six inches, wetted or aerated if needed, and compacted to a density of not less than 95% of the density determined from the Test for Moisture-Density Relationship (AASHO Designation T-99). Concurrent with compaction, the subgrade shall be shaped to plan elevation, grade and cross section.
1.6 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 upon approval of 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.
1.7 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 established grade. This work shall be done with particular care in accordance with all requirements herein.
1.8 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 contractor shall not deposit excess material on private property.
1.9 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.
1.10 EQUIPMENT OPERATED ON 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 operation.
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)