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All pavement costs, openings and excavations shall be backfilled, surfaced and restored according to this chapter and as provided in Title 13, Chapter 10 of this code. Final surfacing shall be made within 30 days from the date the street cut permit is issued. Failure to complete surfacing within the 30-day period shall deem the street cut permit null and void. The performance bond or security will also become due at this time. Public Works shall then take steps necessary to complete the unfinished work. The original permittee may also complete the work upon obtaining a new permit and performance bond. In the case of street cut permits issued after October 15, the permittee shall completely restore the paved surface by November 15 without exception. Failure to do so will also result in the permit becoming null and void. The performance bond will become due on November 15, and Public Works shall take the necessary steps to complete the work. Backfilling under paved streets shall be in accordance with the specifications in §§ 8-1-25 and 8-1-34 of this chapter.
(Ord. 20(1981) § 1; Ord. 8(1991) § 5; Ord. 7(2006) § 21)
(A) Backfill gradation requirements. Material shall be granular, consisting essentially of sand, gravel, rock, slag, disintegrated granite or a combination of such materials. It shall be a well graded mixture containing sufficient soil mortar, crusher dust or other binding materials which, when placed and compacted, will result in a firm, stable foundation. Material composed of uniformly sized particles or which contains pockets of excessively fine or excessively coarse material will not be acceptable. The backfill material shall meet the following gradation:
Sieve Designation | Percent By Weight Passing |
2.5 inch | 100 |
2 inch | 95—100 |
No. 40 | 30—60 |
No. 20 | 5—15 |
(B) Liquid and plasticity standards.
(1) All material passing the No. 40 sieve shall have a liquid limit of not over 35 and a plasticity index of not over six. Test for a liquid limit and plasticity index shall be in accordance with AASHTO designations T-89 and T-91 respectively.
(2) Six inches of Colorado Department of Highway’s class 6 aggregate base course will be required on top of the subgrade material. The class 6 ABC shall meet the following gradation:
Sieve Designation | Percent By Weight Passing |
1 inch | 100 |
3/4 inch | 95—100 |
1/2 inch | 20—55 |
3/8 inch | 0—15 |
No. 4 | 0—5 |
(Ord. 7(1971) § 5(A)(1)(a); Ord. 8(1991) § 6)
(A) Strict rules for compaction; penalty. The bottom 12 inches and the top 18 inches of the subgrade backfill shall be the same type of backfill material specified in § 8-1-25 of this chapter. The excavated material may be used for the remainder of the backfill, provided that no materials greater than six inches in diameter shall be used for backfill. The material shall be deposited in layers not exceeding 12 inches in thickness prior to compacting. Each layer shall be compacted with suitable mechanical tamping equipment. It shall be compacted sufficiently to obtain a field density which is at least 95% of theoretical density as determined by AASHTO method T-147. The permittee shall be required to obtain geotechnical test inspections by a certified technician and reports reviewed by a professional engineer. Public Works shall require all permittees to contact Public Works 24 hours in advance of commencement of backfill operations to allow the Department time to arrange for additional inspection. Failure to obtain proper inspections or contact the Department will result in forfeiture of the street cut bond monies. The cost of compaction tests will be paid by the town. The costs of retests will be paid by the permittee. Compaction methods not authorized herein must be approved by Public Works prior to their use by the permittee.
(B) Longitudinal cuts; special methods. All longitudinal cuts that are located four feet or more into the paved area and exceeding 15 feet in length shall be patched and the entire street overlaid with asphaltic concrete a minimum of one and one-half inches thick. This requirement shall not be applicable to cuts for the installation of structures that extend four feet or more into the paved area, unless otherwise required by Public Works.
(Ord. 20(1981) § 1; Ord. 8(1991) § 7; Ord. 7(2006) § 22)
The bottom six inches and the top 12 inches of subgrade backfill shall be the same type of backfill material specified in § 8-1-25 of this chapter. Six inches of class 6 ABC as specified in § 8-1-25 of this chapter will be required on top of the subgrade material. The excavated material may be used for the remainder of the backfill, provided that no materials greater than 18 inches in diameter shall be used for backfill.
(Ord. 7(1971) § 5(A)(2)(a); Ord. 8(1991) § 8)
The backfill material shall be deposited in layers not exceeding 18 inches in thickness prior to compacting. Each layer shall be compacted with suitable mechanical tamping equipment. It shall be compacted sufficiently to obtain a field density which is at least 90% of theoretical density as determined by AASHTO method T-99. Field density shall be determined by AASHTO method T-147. In no event shall water jetting be allowed for compaction of backfill material.
(Ord. 20(1981) § 1; Ord. 8(1991) § 9)
(A) Relaxed standards. Excavations in unpaved public places not used as vehicular ways may be backfilled with suitable material and shall be compacted in lifts not to exceed 18 inches in depth to sufficiently obtain a field density which is at least 85% of theoretical density as determined by AASHTO method T-99. Field density shall be determined by AASHTO method T-147. The top six inches shall be a topsoil material meeting the following specification:
Topsoil: Natural, friable, fertile soil characteristic of productive soil in the vicinity, reasonably free of stones, clay lumps, roots and other foreign matter.
(B) Landscaping restored. All vegetated areas shall be returned to their original condition. This includes grasses, sod, shrubs, trees, flowers and any irrigation system disturbed during the excavation process per Public Works’ standard landscaping restoration specifications. The lines and grades of the completed grading shall meet the original lines and grades prior to commencement of work.
(Ord. 7(1971) § 5(A)(3); Ord. 43(1978) § 1; Ord. 8(1991) § 10; Ord. 7(2006) § 23)
The cut and restoration of asphaltic concrete or oil-and-chip surface shall be made in the following manner.
(A) Cut. The initial pavement cut shall be made a minimum of one foot wider than the trench on all sides of the trench, a minimum of three feet wide, and the cut in the paving shall be made with a power circular saw or other method as specifically approved in writing by Public Works.
(B) Restoration.
(1) The asphaltic concrete or oil-and-chip surface shall be of grade S, S(x) or equivalent hot bituminous pavement (HBP). The asphalt cement shall be PG 58-28. The minimum depth of asphalt concrete pavement placed over the six inches of class 6 ABC shall be as follows or match the depth of the existing surface surrounding the excavation, whichever is greater:
Bike paths | 3 inches |
Local streets (public/private) | 3 inches |
Collector streets | 5 inches |
Arterial streets | 6 inches |
(2) The minimum lift shall not be less than one and one-half inches thick and the maximum lift shall be two and one-half inches.
(3) The new surface shall meet the lines, grades, quality and appearance of the existing surface surrounding the excavation, and be sealed with a chemical as approved by Public Works.
(Ord. 7(1971) § 5(A)(4); Ord. 43(1978) § 2; Ord. 8(1991) § 11; Ord. 7(2006) § 24)
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