31_00_00.00_51_para_2.5_rev.pdf

FY 19 Road Survey and Design of Humphreys Drive Arlington National Cemetery specifically for warning and identification of buried utility lines.

Provide tape on rolls, 3 inches minimum width, color coded as specified below for the intended utility with warning and identification imprinted in bold black letters continuously over the entire tape length. Warning and identification to read, "CAUTION, BURIED (intended service) LINE BELOW" or similar wording. Provide permanent color and printing, unaffected by moisture or soil.

Warning Tape Color Codes

Red Electric

Yellow Gas, Oil; Dangerous Materials

Orange Telephone and Other Communications

Blue Water Systems

Green Sewer Systems

White Steam Systems

Gray Compressed Air

2.4.1 Warning Tape for Metallic Piping

Provide acid and alkali-resistant polyethylene plastic tape conforming to the width, color, and printing requirements specified above, with a minimum thickness of 0.003 inch and a minimum strength of 1500 psi lengthwise, and 1250 psi crosswise, with a maximum 350 percent elongation.

2.4.2 Detectable Warning Tape for Non-Metallic Piping

Provide polyethylene plastic tape conforming to the width, color, and printing requirements specified above, with a minimum thickness of 0.004 inch, and a minimum strength of 1500 psi lengthwise and 1250 psi crosswise. Manufacture tape with integral wires, foil backing, or other means of enabling detection by a metal detector when tape is buried up to 3 feet deep. Encase metallic element of the tape in a protective jacket or provide with other means of corrosion protection.

2.5 DETECTION WIRE FOR NON-METALLIC PIPING

Insulate a single strand, solid copper detection wire with a minimum of 12

AWG.

2.5 DETECTION/TRACE WIRE

All trace wire shall have HDPE insulation intended for direct bury, color coated per APWA standard for the specific utility being marked.

Trace Wire:

- Open Trench - Trace wire shall be #12 AWG Copper Clad Steel, High strength with minimum 450 lb. break load, with minimum 30 mil HDPE insulation thickness.

SECTION 31 00 00.00 51 Page 10

- Directional Drilling/Boring - Trace wire shall be #12 AWG Copper Clad Steel, Extra High Strength with minimum 1,150 lb. break load, with minimum 30 mil HDPE insulation thickness.

- Trace Wire - Pipe Bursting/Slip Lining - Trace wire shall be 7 x 7 Stranded Copper Clad Steel, Extreme Strength with 4,700 lb. break load, with minimum 50 mil HDPE insulation thickness.

Connectors:

- All mainline trace wires shall be interconnected in intersections, at mainline tees and mainline crosses. At tees, the three wires shall be joined using a single 3-way lockable connector. At crosses, the four wires shall be joined using a 4-way connector. Use of two 3-way connectors with a short jumper wire between them is an acceptable alternative.

- Direct busy wire connectors shall include 3-way lockable connectors and mainline to lateral lug connectors specifically manufactured for use in underground trace wire installation. Connectors shall be dielectric silicon filled to seal out moisture and corrosion, and shall be installed in a manner so as to prevent any uninsulated wire exposure.

- Nonlocking friction fit, twist on or taped connectors are prohibited.

Termination/Access:

- All trace wire termination points shall utilize an approved trace wire access box (above ground access box or grade level/in-ground access box as applicable), specifically manufactured for this purpose.

- All grade level/in-ground access boxes shall be appropriately identified with "sewer" or "water" cast into the cap and be color coded.

- A minimum of 2 ft. of excess/slack wire is required in all trace wire access boxes after meeting final elevation.

- All trace wire access boxes shall include a manually interruptible conductive/connective link between the terminal(s) for the trace wire connection and the terminal for the grounding anode wire connection.

- Grounding anode wire shall be connected to the identified (or bottom) terminal on all access boxes.

- Service laterals on publish property - Trace wire shall terminate at an approved grade level/in-ground trace wire access box, located at the edge of the road right-of-way, and out of the roadway.

- Long-runs, in excess of 500 linear feet without service laterals or hydrants - Trace wire access shall be provided utilizing an approved grade level/in-ground trace wire access box, located at the edge of the road right-of-way, and out of the roadway. The grade level/in-ground trace wire access box shall be delineated using a minimum 48" polyethylene marker post, color coded per APWA standard for the specific utility being marked.

Grounding:

SECTION 31 00 00.00 51 Page 11

- Trace wire shall be properly grounded at all dead ends/stubs.

- Grounding of trace wire shall be achieved by use of a drive-in magnesium grounding anode rod with a minimum of 20 ft. of #14 red HDPE insulated copper clad steel wire connected to anode (minimum 0.5 lb.) specifically manufactured for this purpose, and buried at the same elevation as the utility.

- When grounding the trace wire at dead ends/stubs, the grounding anode shall be installed in a direction 180 degrees opposite of the trace wire, at the maximum possible distance.

- When ground the trace wire in areas where the trace wire is continuous and neither the mainline trace wire or the grounding anode wire will be terminated at/above grade, install grounding anode directly beneath and in-line with the trace wire. Do not coil excess wire from grounding anode. In this installation method, the grounding anode wire shall be trimmed to an appropriate length before connecting to trace wire with a mainline to lateral lug connector.

- Where the anode wire will be connected to a trace wire access box, a minimum of 2 ft. of excess/slab wire is required after meeting final elevation.

INSTALLATION

General:

- Trace wire installation shall be performed in such a manner that allows proper access for connection of line tracing equipment, proper locating of wire without loss or deterioration of low frequency (512Hz) signal for distances in excess of 1,000 linear feet, and without distortion of signal caused by multiple wires being installed in close proximity to one another.

- Trace wire systems shall be installed as a single continuous wire, except where using approved connectors. No looping or coiling of wire is allowed.

- Any damage occurring during installation of the trace wire shall be immediately repaired by removing the damaged wire, and installing a new section of wire with approved connectors. Taping and/or spray coating shall not be allowed.

- Trace wire shall be installed at the bottom half of the pipe and secured (taped/tied) at 5' intervals.

- Trace wire shall be properly grounded as specified.

- Trace wire on all service laterals/stubs shall terminate at an approved trace wire access box located directly above the utility, at the edge of the road right-of-way, but out of the roadway. (See Trace Wire Termination/Access).

- At all mainline dead-ends, trace wire shall go to ground using an approved connection to a drive-in magnesium grounding anode rod, buried at the same depth as the trace wire. (See Grounding).

- Mainline trace wire shall not be connected to existing conductive pipes. Treat as a mainline deadend, ground using an approved waterproof connection to a grounding anode buried at the same depth as the trace wire.

SECTION 31 00 00.00 51 Page 12

- All service lateral trace wires shall be a single wire, connected to the mainline trace wire using a mainline to lateral lug connector, installed without cutting/splicing the mainline trace wire.

- In occurrences where an existing trace wire is encountered on an existing utility that is being extended or tied into, the new trace wire and existing trace wire shall be connected using approved splice connectors, and shall be properly grounded at the splice location as specified.

Testing:

All new trace wire installation shall be located using typical low frequency (512 Hz) line tracing equipment, witnessed by the Contractor, Engineer and Facility Owner as applicable, prior to acceptance of ownership. This verification shall be performed upon completion of rough grading and again prior to final acceptance of the project. Continuity testing in lieu of actual line tracing shall not be accepted.

Prohibited Products and Methods The following products and methods shall not be allowed or acceptable.

- Uninsulated trace wire

- Trace wire insulations other than HDPE

- Trace wires not domestically manufactured

- Nonlocking, friction fit, twist on or taped connectors

- Brass or copper ground rods

- Wire connections utilizing taping or spray-on waterproofing

- Looped wire or continuous wire installations, that has multiple wires laid side-by-side or in close proximity to one another

- Trace wire wrapped around the corresponding utility

- Brass fittings with trace wire connection lugs

- Wire terminations with the roadway, i.e. in valve boxes, cleanouts, manholes, etc.

- Connecting trace wire to existing conductive utilities

2.6 MATERIAL FOR RIP-RAP AND STONE EDGE

2.6.1 Material for Rip-Rap

Provide sound, durable, and free from seams, cracks, and other structural defects. Stones shall weigh between 25 and 75 pounds each, except that approximately 10 percent may weigh 25 pounds or less and 10 percent may weigh 75 to 100 pounds. Larger stones shall meet requirements for VDOT Class A1 rip-rap in accordance with VDOT Road and Bridge Specification, 2016. Smaller stones shall be assorted natural colors of grey, white, green, red, and brown. Submit product data indicating stone size and color and proportions of each size and color.

2.6.2 Material for Stone Edge

Provide sound, durable, and free from seams, cracks, and other structural defects. Stones shall be mixed sizes. Small size: 6-8". Large size 12-14". Approximately 10 percent may be less than 6". Small size stones shall be assorted natural colors of grey, white, green, red, and brown.

Large size stones shall be grey or brown. Submit product data indicating stone size and color and proportions of each size and color.

SECTION 31 00 00.00 51 Page 13