(A) Traffic maintenance.
(1) The permit holder shall maintain traffic through the project at all times in conformance with KTC Item 112. The permit holder shall adequately mark, through the use of barrels, flashing lights, portable gates, and/or other devices approved by the Public Works Director, or a designee, the limits of the project area and those areas of the site which are temporarily closed to traffic
(2) During the course of the normal working day, the permit holder shall insure the safety of the public by providing a sufficient number of flaggers to assist the traffic flow through the work area. If, at the completion of the normal working day, any trench for utility construction has not been completely backfilled and restored, a temporary cover properly secured, such as a metal plate or another approved device, shall be placed over the portion of the trench remaining open. Improperly secured temporary covers requiring emergency service by the city shall be billed directly to the permit holder.
(3) The permit holder shall notify the residents and businesses at least 48 hours in advance of when their driveways will be blocked during construction, or their property will otherwise adversely be affected, except during emergency repair work. If business property is affected, an alternate access must be provided if blockage exceeds one hour, except during emergency repair work. Length of residential driveway closures or blockages shall be kept to a minimum.
(B) Restricted working hours. Unless a cut must be made in an emergency situation, city streets have restricted working hours from 7:00 a.m. until 6:00 p.m., Monday through Friday; and 7:00 a.m. until 3:00 p.m., Saturdays. Such work shall not be conducted on Sundays. Prior approval from the Public Works Director is required for any deviation.
(C) Tunneling.
(1) All streets are to be bored or tunneled unless otherwise approved by the Public Works Director.
(2) Tunneling is often necessary where pipe or conduit passes under curb, the street, or other underground facilities. The permit holder shall not do any tunneling except by permission of the Public Works Director. Where the permit holder has resorted to tunneling, he or she shall bed the pipe or conduit as specified below under division (E) of this section, "Backfilling and Restoration." The remainder of the space from the top of this fill to the roof of the tunnel shall be completely filled with 1:4:8 concrete of suitable consistency, throughly tamped to fill the entire space, and to afford a rigid support for the tunnel roof for its entire area. The complete backfilling of the tunnel shall be performed to pass the approval of the Public Works Director.
(3) 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 the permit will only be made for that portion of the street over which the services are installed.
(D) Trenching (including utility repairs).
(1) Whenever culverts, sewers, manholes, valve chambers, catch basinconnections, water mains, gas pipe, electric conduits, or house connections thereto, or any type of subsurface facilities are exposed in excavating, the permit holder shall, at his or her own expense, protect them from damage.
(2) The length, width, and location of the trench or street cut, also the manner in which the work is done, shall be under the direction of the Public Works Director, or a designee. Every precaution shall be taken to safeguard the work and to minimize inconvenience to the public.
(3) The permit holder shall carefully saw cut and remove the paving and base course materials and store them in piles separated from the excavated earth. Excavated materials 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 insure adequate drainage. In special cases, it may be necessary to remove part or all of the excavated material from the street.
(4) 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 the Public Works Director considers it 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 permit holder shall, at his or her own cost and expense, break down and remove the undermined pavement and the foundation thereof and shall also remove loose earth and replace it with earth properly compacted or low strength mortar backfill in the manner provided below under division (E) of this section, "Backfilling and Restoration."
(E) Backfilling and restoration.
(1) Backfill and restoration of pavement and sod areas shall conform to the following specifications:
(a) Low-strength mortar backfill material.
1. Description. This work shall consist of the placement of a flowable mixture of portland cement, fly ash, and sand for backfilling conduits under public roadways.
a. Cement 801.01.
b. Fly Ash shall meet ASTM C-618.
c. Fine aggregate shall be natural sand or sand manufactured from stone, gravel, or air-cooled slag. The gradation of the sand shall meet the requirements of 804. The sand shall be fine enough to stay in suspension in the mixture to the extent required for proper flow. The Public Works Director reserves the right to reject the sand if a flowable mixture cannot be produced.
d. Water used for mortar backfill shall be free from oil, acid, strong alkalines, or vegetable matter.
2. Mortar mix proportioning.
a. The initial trial mixture shall consist of the following quantities of materials per cubic yard:
Material | Class LSM-O |
Cement | 50 lbs. |
Fly ash | 250 lbs. |
Sand | 2910 lbs. |
Water (target) | 500 lbs. |
b. Adjustments of the proportions may be made by the Public Works Director, provided the total absolute volume of the materials is maintained.
3. Mix adjustment.
a. The supplier shall make one or more cubic-yard trial batches at different water contents to insure a flowable mortar. Mixture is too dry when cracks develop in the mortar as it flows into place.
b. To expedite settlement of the mortar, it will be necessary for bleed water to appear on the surface immediately after the mortar is struck off. A delay in bleeding indicates there are too many fines in the mixture, so the fly ash quantity shall be reduced in increments of 50 pounds until the mixture is bleeding freely. Approximately 60 pounds of sand shall be added to replace each 50-pound increment of fly ash to maintain the original yield.
4. Mixing mortar. The mortar shall be delivered to the site of the work and discharge shall be complete within 2.5 hours.
5. Placing mortar.
a. Flowable mortar shall be discharged from the mixer by any reasonable means into the space to be filled. The fill material shall be brought up uniformly to the fill line shown on the plans or as directed by the Public Works Director. Placing of material over low-strength mortar backfill may commence as soon as the surface water is gone or as directed.
b. Before placing the flowable mortar as backfill for a storm sewer conduit, the permit holder shall secure the conduit to prevent it from floating during placement of the flowable mortar. The permit holder's proposed method of backfill placement and proposed method of holding the conduit at the plan grade and flowline elevations should be established prior to construction.
(b) Excavation material for compacted backfill. Any material from excavation of trenches which is desired to be used for backfill above pipes and which is to be compacted shall be clean and shall be of such composition that the material can be compacted to 95% relative density with near optimum water content.
(c) Seeding and protection. All grass areas disturbed by construction shall be restored by seeding and mulching as per KTC Item 212.03.
(d) Full-depth pavement sawing. All existing pavement to be removed shall be sawed full depth at the limits of removal, using a diamond saw blade to provide a uniform edge and prevent damage to the pavement that is to remain in place. All pavement sawing should be performed at right angles whenever possible.
(e) Item 403-sealing edges.
1. All edges of the asphalt concrete surface course constructed pursuant to the permit shall be sealed with asphalt cement meeting the same specifications as used in Item 403. Sealing edges shall be done neatly and without more than 1/2 inch of the sealant being visible on the surface.
2. Any extra sealant applied to visible surfaces shall be carefully and thoroughly removed by the permit holder.
(f) Responsibility for dust, mud, dirt, debris, and appearance. The permit holdershall do everything possible to minimize dust mud, dirt, and debris and to keep the appearance of the area surrounding the street opening in good order. The permit holder shall use calcium chloride or equal to keep dust to a minimum. After the close of each working day, the permit holder shall see that the area surrounding the work area is swept up and as clean as possible. At no time will it be permissible to leave piles of excavated materials or dirt or mud in the street and sidewalk. If necessary, the area should be washed with water. The permit holder shall do whatever the Public Works Director deems necessary to clean up the area. In the event the permit holder fails to comply with the provisions set forth herein, the city may take the necessary steps to clean the area consistent with the requirements herein. The permit holder shall be responsible for the costs of such work by the city, and the city may either invoice the permit holder for such work or deduct the appropriate amount from the permit holder's guaranty being held by the city.
(g) Typical detail sections. The typical detail sections (numbers one through six) attached to Ord. 2005-02, passed 3-21-05, and adopted herein by reference as if set forth fully in this section shall be utilized for all restoration work based upon the existing conditions and improvements.
(h) Applicable laws. In no event shall the provisions and requirements set forth in §§ 93.25 through 93.30 replace or be substituted for any applicable laws or rules or regulations applicable to the work performed by any permit holder, including any OSHA requirements. Any permit holder shall be bound and otherwise abide by all such applicable laws, rules, and regulations.
(Ord. 2005-02, passed 3-21-05) Penalty, see § 93.99