(A) Trenching.
(1) Whenever culverts, sewers, manholes, valve chambers, catch basin connections, water mains, gas pipe, or electric conduits, or house connections thereto, or any type of subsurface facilities are exposed in excavating, the permittee shall, at his or her own expense, protect them from damage.
(2) In all cases where an opening is to be located under or near any railroad track, or in any way jeopardizes the safe operation of railroad equipment or any subsurface facility, the permittee shall notify the owner or operator thereof sufficiently in advance of the date on which opening is to be made. The entire cost of supporting and maintaining tracks or other facility and the entire cost of services necessary for safe operation of railroad equipment, shall be borne by the permittee. No obstructions of any nature shall be placed on tracks.
(3) The permittee shall use all necessary precautions to protect persons or property from injury or damage. Barricades and sufficient warning lights shall be placed along the opening. Flagpersons shall be provided by the permittee if considered necessary by the Chief of Police.
(4) The length, width, and location of the trench, also the manner in which the work is done, shall be acceptable to the Village Engineer. Every precaution shall be taken to safeguard the work, and to inconvenience the public as little as possible.
(5) The permittee shall carefully remove the paving and base course materials and store them in piles separated from the excavated earth. Excavated material shall be placed so as not to obstruct gutters or drains and in such manner as will cause minimum inconvenience to the public. If necessary, temporary covers for gutters shall be installed to ensure adequate drainage. In special cases, it may be necessary to haul part or all of the excavated material from the street.
(6) Openings shall be properly sheeted and braced where necessary, to prevent caving, slipping, or cracking of sides. Sheeting and bracing, used to support the sides of the opening, shall be carefully removed as the backfilling of the trench progresses, but if considered by the Village Engineer necessary for the protection of the banks, the sheeting and bracing shall be cut off two feet below the surface of the subgrade and left in place. If pavement along the sides of the opening is or becomes undermined and unsupported, the permittee shall, at his or her own cost and expense, break down and remove such undermined pavement and the foundation thereof, and shall also remove all loose earth and replace with earth properly compacted in the manner provided under division (B) below.
(B) Backfilling.
(1) Unless the Village Engineer elects alternate methods A or B in divisions (B)(5) and (B)(6) below, backfill shall be made with material excavated from the trench, except under no condition will soil with an excessive amount of clay, frozen lumps, or other unstable substances be used as backfill. Alternate method A will be required at all important intersections and certain other special locations, as for example, where insufficient clearances exist between structures, preventing proper and expeditious compaction of the backfill.
(2) After the pipe or conduit has been placed, approved backfill material, free from rock, shall be placed in four-inch layers thoroughly tamped by mechanical means to a plane at least six inches above the top of the structure. Backfill above the level of six inches above the top of the structure shall be deposited uniformly and brought up gradually in layers not exceeding five feet in thickness. Each layer of backfill shall be compacted by the use of water jets at least one and one-quarter inch inside diameter and of sufficient length to extend to the bottom of the backfill layer. The jet shall be operated with a water pressure of at least 40 pounds per square inch and in such a manner as to permeate the backfill thoroughly.
(3) Flooding may be used instead of jetting, in which case each layer shall be compacted by thorough flooding with water. During flooding, the water shall be allowed to flow slowly to the trench from high points and shall be worked down to the full depth of the backfill later by bars. All bars shall be long enough to extend entirely through the layer being filled. They shall be forced down through the loose backfill material and as withdrawn, the water allowed to flow down and around the bar. Sufficient hose shall be provided in order to apply water to the trench at intervals not to exceed 100 feet.
(4) When alternate backfill methods A or B in divisions (B)(5) and (B)(6) below are used, the permittee may elect to make immediate permanent restoration and will not be required to make temporary restoration as specified in § 153.07.
(5) In alternate backfill method A, the backfill above six inches above the top of the structure shall consist of a well-graded bank run gravel with the top size not exceeding three inches in its largest dimension, and containing not over 20% silt. The bank run gravel shall be brought to a plane parallel to and uniform 24 inches below the finished pavement and thoroughly compacted by flooding with water. During flooding, water shall be allowed to flow slowly into the trench from high points. Sufficient hose shall be provided in order to apply water to the trench at intervals not to exceed 100 feet.
(6) In alternate backfill method B, the backfill above six inches above the top of the structure shall consist of the original excavated earth backfill in horizontal layers not exceeding six inches in depth before compaction. Each layer shall be thoroughly compacted by approved power tamping equipment and methods. In single isolated cuts, hand tamping may be substituted for power tamping but backfill materials shall be placed in horizontal layers not exceeding four inches in depth before compaction and each layer thoroughly compacted.
(C) Tunneling.
(1) Tunneling is often necessary where pipe or conduit passes under curb, or underground facilities. The permittee shall not do any tunneling except by permission of the Village Engineer. Where tunneling has been resorted to, the permittee shall bed the pipe or conduit as specified under division (B) above. The remainder of the space from top of this fill to the roof of the tunnel shall be completely filled with l:4:8 concrete of suitable consistency, thoroughly tamped to fill the entire space, and to afford a rigid support for the tunnel roof for its entire area. The complete backfilling of a tunnel shall be performed under the supervision of a Village Inspector. The permittee shall notify the Col. Donald L. Shanks Municipal Building not less than 24 hours in advance of the date that such backfilling is to start.
(2) In the installation of small service pipes, it is suggested that the pipe be jacked through or that a hole of sufficient size be bored. In such cases, charge for inspection and issuance of permit only will be made for that portion of street over services so installed.
(2000 Code, § 153.06) (Ord. O-23-81, passed 10-26-1981)