(A) Where an underground utility is to be placed in an area which has a permanent type street or sidewalk surface, or upon which such a surface is to be constructed within a period of one year, the backfill above the utility or in case of sewers, above the top of the granular cradle, to the level of the bottom of the permanent type pavement shall be made. This material will be in all areas where utility trenches cross the pavement subgrade, except in areas which will be lime treated or areas where rock will be used to stabilize the subgrade. The backfill shall be IDOT CA-6 or CA-7 crushed stone. Boiler slag will not be permitted.
(B) As an alternate, the use of “flowable fill” will be permitted. This mix shall consist of a lean concrete mix with no less than 50 pounds of cement per cubic yard, 200 to 600 pounds of fly ash, 2,000 to 3,000 pounds of fine aggregate and 35 to 65 gallons of water. Minimum 28-day compressive strength shall not be less than 150 psi.
(C) In areas not now subject to vehicular traffic, nor in the opinion of the village’s consulting engineer likely to be within a period of one year, backfill may be made with selected excavation material which is free from clods and stones; provided, such trench backfill is adequately jetted from the bottom up completely filling the trench immediately after backfilling.
(Prior Code, § 150.046) (Ord. 96-006, passed 2-5-1996)