Chapter 12.20
ROAD CONSTRUCTION STANDARDS
Sections:
12.20.010 General specifications.
12.20.040 Handling of explosives.
12.20.050 Cooperation with utilities.
12.20.060 Temporary traffic control.
12.20.070 Clearing and grubbing.
12.20.090 Subgrade construction.
12.20.100 Surfacing requirements.
12.20.110 Permanent traffic control.
12.20.010 General specifications.
Unless otherwise detailed in this chapter, all roadway excavation, fill construction, subgrade preparation, installation of drainage facilities, aggregate base, surfacing, prime coats and paving will be done in accordance with the current edition of the Oregon State Highway Division Standard Specification for Highway Construction, hereinafter referred to as the “general specifications”). Whenever these specifications refer to the state, they shall be taken to mean the county, the appropriate county address, and likewise, references to the commission shall be taken to mean the Jefferson County board of county commissioners, references to the engineer shall be taken to mean the Jefferson County public works director, and references to contractor shall be taken to mean the owner and/or developer. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.020 Testing.
All testing shall conform to methods described in AASHTO Materials, Part II, Tests, current edition. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.030 Inspection.
The department of public works shall be notified two working days in advance of the time for sub-grade inspection, two working days in advance of the time for base inspection and two working days in advance of the time for paving inspection. Each stage of construction must be inspected and approved prior to the commencement of the next stage of construction. The final inspection shall be requested seven working days in advance. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.040 Handling of explosives.
In the handling of explosives, the contractor must comply with federal, state and local laws, and the county will in no way be responsible for any non-compliance therewith or for damages to property or injury to persons resulting from accidental or premature explosions. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.050 Cooperation with utilities.
The contractor shall, at least twenty-four (24) hours in advance of performing any work in the immediate vicinity of utility lines, contact the utilities to request the location and marking of buried utility facilities. The county is covered by the Central Oregon Utility Coordinating Council, which has been set up on a one-call system for notifying all owners of work being performed in the vicinity of their facilities. The developer/contractor shall acquire all required federal, state and local permits prior to beginning construction, and shall provide approved copies to the Jefferson County public works department. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.060 Temporary traffic control.
A. Temporary protective and directional measures for traffic control shall be in conformance with the Federal Highway Administration current Manual on Uniform Traffic Control Devices.
B. The contractor shall be required to allow one-way traffic through the project during working hours. One-way traffic operation will not be permitted until such time as the Contractor has labor, equipment and materials on the project necessary to proceed without delaying the work. Once one-way traffic is established, the contractor shall perform the construction work in a continuous and efficient manner.
C. If work is to be conducted in a location which could impact the operation of public services such as schools, police or fire the contractor shall contact such agency(s) and coordinate activities in such a manner as to minimize conflict.
D. The contractor/developer shall have a person on the job site during work hours and on-call at all other times, who shall have the responsibility to maintain all directional and warning devices in proper position. The county public works department shall be provided with the name and telephone number of such person. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.070 Clearing and grubbing.
All work shall be performed in accordance with Section 320 of the general specifications supplemented and/or modified as follows:
The right-of-way shall be cleared of all fixed objects. However, in developments where traffic safety would not create a hazard, the right-of-way shall be cleared a minimum of forty (40) feet or four feet beyond the edge of the shoulder or curb line of the finished road. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.080 Dust control.
A. The work shall consist of the furnishing and applying of water for the alleviation or prevention of dust nuisance in accordance with Section 340 of the general specifications.
B. Responsibility for dust abatement shall be the contractor/developer’s.
C. Watering beyond the requirements of the general specifications will be done when so ordered by the public works director.
D. The contractor/developer shall be responsible for the water source. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.090 Subgrade construction.
All work shall be performed in accordance with Part 300 of the general specification, supplemented and/or modified as follows:
A. Excavated materials not required for filling/backfilling or materials which are deemed not suitable (by the public works director) for filling and backfilling, within the limits of the project, will be classed as excess materials and shall become the property of the contractor at the point of excavation and shall be disposed of by the contractor at a location and in a manner satisfactory to the public works director. In the event rock is encountered in excavation, the rock will be excavated to a depth not less than six inches below subgrade, and then backfilled with suitable free draining material.
B. Material shall be considered unsuitable for fill, subgrade, shoulders and other uses if it contains organic matter, soft spongy earth or other material of such nature that compaction to the specified density is unobtainable.
C. No material having a maximum dimension of three inches or more shall be considered suitable for fill material in the top one foot of subgrade, including the fill side slopes.
D. Compaction shall be a minimum of ninety-five (95) percent of the relative maximum density within the top two feet of the subgrade prism, ninety (90) percent of the relative maximum density below the top two feet. Relative maximum density shall be determined by ASSHTO modified proctor. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.100 Surfacing requirements.
A. Aggregate Base.
1. Crushed aggregate meeting the requirements of Section 00641 of the general specifications shall be used.
2. All work shall be performed in accordance with Section 00641 of the general specifications.
B. Asphalt Prime Coat. For all roadway sections using an asphalt penetration macadam, an asphalt prime coat will be applied to the aggregate base in accordance with Section 00730 of the general specifications. The oil will be CRS-2 as specified in Section 00730 of the general specifications. The application rate of the oil shall be .60 gallons per square yard. Aggregate shall be applied over the prime coat and shall be a minimum of one inch thick.
C. Asphalt Penetration Macadam. When an oil mat is placed, it shall be applied in accordance with Section 00730 of the general specifications. It shall be equal to or greater than a type 0-11 penetration macadam as shown in ODOT standard drawing 1833.
D. Asphaltic Concrete Pavement. Where asphaltic concrete pavement is required, it shall be placed in accordance with Section 00749 of the ODOT general specifications. The asphalt cement shall be AR-2000. The class of asphaltic concrete shall be Class C. A mix design shall be submitted for approval at least one week prior to paving.
E. Tack Coat. When a tack coat is required by the public works director, the tack coat shall be applied in conformance with Section 00700 of the general specifications.
F. Portland Cement Concrete Pavement. When Portland cement concrete pavement is used, it shall be designed and constructed in accordance with the publications of the Portland Cement Association. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.110 Permanent traffic control.
Signing and striping shall be in accordance with MUTCD and ODOT standards and shall be procured and installed at the expense of the developer in accordance with a signing and striping plan submitted and approved by the public works director prior to beginning installation. (Ord. O-110-02 § 3 Exh. C (part), 2002)
12.20.120 Final cleanup.
A. Final cleanup shall consist of grading the shoulders and dressing of the earthwork side slopes.
B. Any material pulled on to the pavement is to be broomed off. The roadway side slopes are to be raked to remove all equipment tracts and berms.
C. It shall be the responsibility of the developer/contractor to repair any existing roads damaged during construction to the satisfaction of the public works director. (Ord. O-110-02 § 3 Exh. C (part), 2002)