Section 5 12. Utility Trench Restoration (With Flowable Fill Option)

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Utility Trench Restoration

SECTION 5 SITE AND ROAD WORK

12. Utility Trench Restoration (with flowable fill option)

Second Cut: Existing pavement shall be saw cut along a neat straight line to the farthest point broken or disturbed asphalt.

Compacted Lime Rock base course twice in thickness of adjoining base or 12″ Minimum  compacted to a density of 98% (contractor must provide density test results prior to paving) modified proctor T180.

Clean back fill no rock greater than 2″ or course sand.  12″ lift mechanically hydraulically 90% compacted.

Clean course sand hydraulically compacted to 90 degree density modified proctor T180 or flowable fill as approved by City Engineer.

Where unstable soils are encountered, including peat, muck or other organic soils, elastic silt or clays bellows the water table, a foundation is required.  Foundation material shall be 6″ course sand.

Asphaltic concrete type S-III minimum 2 inch thick.  Apply tack coat to base and along existing asphalt edges.

Mill and resurface min. 1″ to a full lane or as directed by the Public Works Department prior to placing pavement, City Public Works inspection is required.

Stage #1: Place flowable fill midway up on both sides of the utility.  Allow to harden before placing stage #2.

Stage #2: Place flowable fill to be bottom of the existing base course.  Do not allow the utility being installed to float.  If a method is provided to prevent floatation from occurring, Stage #1 and #2 can be combined if approved by the Engineer.  If pipe is DIP place at least 6″ of compacted sand above pipe or rap with plastic.

Compacted lime rock base course to match thickness of adjoining base or 12″ min. compacted in 6″ thick lifts to a density of 98%.  9contractor must provide density test results prior to paving) modified proctor T180.

Asphaltic concrete: type S-III minimum 2 inches thick.  Apply tack-coat to base and along existing asphalt edges.

Mill and resurface min. 1″ to a full lane or as directed by the Public Works Department.  Prior to placing pavement, City Public Works inspection is required.

Second Cut:  Existing pavement shall be saw cut along a neat straight line to the farthest point of broken or disturbed asphalt.