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ArIZONA SPECIFICATIONS FOR DAMAGE PREVENTION
Arizona Department of Transportation
ADOT Standard Specifications for Road and Bridge Construction, 2008
104.15 (A) Providing Magnetic Detection for Underground Facilities, General
All new underground utility facilities, including service connections, placed within ADOT Right-of Way by the contractor must be magnetically detectable with standard locating instruments, such as a Metrotech Model 810 or approved equal. The contractor shall place continuous detectable tracer wire with all those underground utility facilities that lack a continuous and integral metallic component capable of detection by standard locating instruments.
Tracer wire will not be required for power cables and wires, telephonic or electronic communications, or for landscape irrigation lines smaller than two inches in diameter. For Salt River Project Water Users Association (S.R.V.W.U.A.) irrigation facilities, no tracer wire will be required if Salt River Project provides their own tracer system.
Tracer wire will be required for non-metallic pipe such as High Density Polyethylene (HDPE) and Vitrified Clay Pipe (VCP); and for Polyvinyl Chloride pipe (PVC) two inches in diameter and larger. Tracer wire will be required where the metallic component is encased within the pipe, such as reinforced concrete pipe (RCP) and (RGRCP), and Steel Cylinder Concrete Pipe.
Tracer wire will also be required for non-metallic cable, service connections, and other utility lines; fiber optic lines; empty duct banks SECTION 104 57 and duct banks containing a utility that is not magnetically detectable, either before or after backfilling; and other facilities as determined by the Engineer. Cast iron and ductile iron pipes may be non-conductive because of site specific soil conditions or construction configuration; as a consequence all new installations of cast iron and ductile iron pipes shall also be made detectable with tracer wire. For all other underground facilities, should the magnetic characteristics be unknown, the contractor shall perform sufficient tests with standard locating instruments to determine whether tracer wire will be necessary, and provide the results to the Engineer. Such tests shall be performed prior to construction. The contractor shall also provide access points, as specified below, for all facilities that will receive tracer wire.
104.15 (B) Providing Magnetic Detection for Underground Facilities, Materials
(B) Materials: Tracer wire shall be a minimum 12 American Wire Gauge (AWG) solid copper. Tracer wire shall be coated with a minimum 30 mil polyethylene jacket designed specifically for buried use. Tracer wire shall conform to the specifications of the NEC, UL, and other applicable industry standards. Splices as required to promote continuity shall utilize sealed water tight connections.
New access boxes shall be concrete pull boxes in accordance with Subsection 732-2.03 (Number 5 Pull Box, Traffic Standard T.S. 1-1), except that the cover shall be marked with the name of the utility or type of facility.
104.15 (C) Providing Magnetic Detection for Underground Facilities, Construction Requirements
The contractor shall install tracer wire along the top of the entire length of the underground facilities. The tracer wire shall be attached to the facility at minimum intervals of not more than 20 feet, and shall be secured in such a manner that the wire remains firmly attached throughout the construction period.
Tracer wire shall be made accessible along the facility through appropriate pull boxes or other means as approved by the Engineer. New or existing junction boxes or pull boxes included in the construction of conduit or other transmission facilities shall be utilized as access structures wherever possible. For sanitary and storm sewer pipe, tracer wire shall be constructed into the manhole at the pipe entry point, secured to the inside wall along the full length, and be accessible from above upon removal of the manhole cover. For water lines requiring tracer wire, the contractor shall provide access to the wire within the valve boxes. The contractor shall provide and install new access boxes for all tracer wire which cannot be terminated in a new or existing junction or pull box, or new manhole or valve box.
Pull boxes shall be installed flush with the finished grade.
Tracer wire shall be securely attached to the facility at each access point and extended vertically to the access box. The tracer wire shall be terminated with a minimum of 12 inches of slack above the bottom of the pull box.
Tracer wire installed for each segment of underground utility shall be terminated at each access point within the pull box, junction box, manhole, or valve box. The contractor shall make no connections or splices of tracer wire across access points.
New pull boxes installed exclusively for tracer wire shall be placed directly above the utility line in easily reachable areas. For facilities that cross ADOT right-of-way, tracer wire shall be made accessible at the right-of-way line at approved access points.
For facilities placed longitudinally in ADOT right-of-way, access points shall be located between the right-of-way line and the outside edge of the shoulder or grader ditch, or back of sidewalk or curb and gutter as applicable. Access boxes installed exclusively for tracer wire shall be provided at intervals no greater than 2,000 feet or, as a minimum, at the point each line crosses ADOT right of way. If the utility line is placed outside the preferred location of the access box as described above, the box shall be located in the preferred location and tracer wire shall be installed in a suitable conduit and brought up to the pull box.
For jacking and boring, tracer wire shall be placed inside the jacked sleeve and attached to the utility facility
Empty conduits and duct banks shall have a tracer wire attached to the outside of the facility.
When sanitary sewer force mains are installed in ADOT right-of-way, tracer wire access shall be accomplished by attaching the wire to the outside of wet wells and terminating the wire in pull boxes (Number 5, Traffic Standard T.S. 1-1) placed adjacent to the wet well.
104.15 (D) Providing Magnetic Detection for Underground Facilities, Testing
The contractor shall test all installed tracer wire, and all those facilities determined to be magnetically detectable without tracer wire, with standard locating instruments to verify conductivity, both before and after backfilling, and provide the results to the Engineer. The contractor shall install new tracer wire for those newly installed utilities that fail to be detectable, at no additional cost to the Department. Tracer wires that fail to test properly shall also be replaced at no additional cost to the Department.
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