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  § 30-23. Excavation and backfill standards  


Latest version.
  • (a) Generally.

    (1) All underground facilities installed under graveled or paved streets must be encased in a manner approved by the city inspector to facilitate future removal and must be covered with a minimum of 36 inches of backfill.

    (2) Upon restoration, excavation sites should be capable of sustaining vehicular traffic.

    (3) An excavation site should be restored so that its surface is at least comparable to its original surface, if not improved. The restored surface shall be inspected by the city building official.

    (b) Type A excavations.

    (1) Type A excavations shall be backfilled with select material from the excavation site or with material compatible to the surrounding soil. Soil used for backfill shall be compacted to not less than 90 percent density by means of tamping, rolling, jetting, or flooding. Placement of backfill shall be in layers or lifts appropriate to the depth, width, manner of compaction, and soil type. Excess material not suitable for backfill shall be removed from the site by the permit holder and disposed of at a site that is not detrimental to the city and/or the Sherwood Shores Trust Subdivision.

    (2) Excavation of a park or of open ground shall require:

    a. A minimum of one foot of top soil, to be mounded so as to provide for future settling; and

    b. The replacement of sod.

    (c) Type B excavations. Type B excavations shall be backfilled with select material from the excavation site to within 18 inches of the surface. Soil used for backfill shall be compacted to 95 percent density by means of tamping or rolling. The top 18 inches shall be material meeting the specifications for flexible base and shall be placed and compacted in not less than two layers.

    (d) Type C excavations. Type C excavations shall be backfilled with caliche, gravel, or crushed stone compacted to a 95 percent density by means of mechanical tamping. The backfill material shall meet the specifications for flexible base and be placed and compacted in six-inch layers to the level of the street surface, and the cut opened to traffic. In not less than one week nor more than one month, material at the top of the trench shall be removed and concrete or asphaltic concrete placed to the thickness of existing pavement or two inches, whichever is the greater. The finished surface shall be smooth and true without depressions or mounds, and shall be compacted before opening to traffic.

(Ord. No. 246, § 5, 1-14-1991)