NATURAL RESOURCES CONSERVATION SERVICE

**Idaho**

**CONSTRUCTION SPECIFICATIONS**

**FOR**

### PIPELINE

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(Owner/Operator) (Project Title)

GENERAL

Installation shall be in accordance with an approved design and plan.
Details of construction shown on the drawings, but not included herein,
shall be considered as part of these specifications. Construction
activities shall be in accordance with Department of Labor, Occupational
Safety and Health Administration (OSHA) regulations. This construction
specification pertains to buried installations.

MATERIALS

Pipe shall be of the type, size and pressure rating shown on the
drawings and shall meet the requirements of the appropriate material
specifications.

Steel pipe and fittings shall be galvanized and meet the requirements of
AWWA Specification C-200.

Plastic pipe shall comply with ASTM Specifications:

-   D 1527 or D 2282 for AcrylonitrileButadiene-Styrene (ABS).

-   D 2104, D 2239, D 2447, D 2737 or D 3035 for Polyethlene (PE).

-   D 1785, D 2241, D 2672 or D 2740 for Polyvinyl Chloride (PVC).

-   D 2513 for Thermoplastic Gas Pressure Pipe.

-   D3350 and D 2837 for PE3408 HDPE Pipe.

The pressure rating of fittings shall meet or exceed the strength
requirements of the pipe. All fittings shall be of a material that is
recommended for use with the type of pipe that is specified. As
appropriate, plastic pressure pipe fittings shall conform to ASTM
Specifications: D 2464, D 2466, D 2467, D 2468, D 2609, D 2683, D 3139
and/or D 3261.

Solvents for solvent-welded plastic pipe joints shall conform to one of
the following ASTM specifications as appropriate: D 2235, D 2564, or D
2855. Rubber joints for pipe joints shall conform to ASTM F 477,
Elastomeric Seals (Gaskets) for Joining Plastic Pipe.

Pipelines to convey water that may be used for human consumption shall
meet the requirements of the Idaho Department of Health and Welfare for
material and installation, and plastic pipe shall be marked with NSF
approval.

INSTALLATION

The pipe trench shall be excavated at the required location and depth as
shown on the drawings and/or staked in the field. The bottom of the
trench shall be reasonably smooth so that pipe will be properly
supported.

Trenches for pipelines shall be free of rocks and other sharp edged
materials. Plastic pipe shall be placed in a \"snake\" like position.
Semi-rigid pipe may require expansion joint couplers.

Plastic pipelines may be placed by \"plow-in\" equipment where soils are
suitable and rocks and boulders will not be detrimental to the pipe.

Pipelines shall be placed so they are protected against hazards imposed
by traffic, farm operations, freezing temperatures or soil cracking.

Pipelines shall have a minimum cover of 18 inches. Other means of
protection must be provided where the depth required for protection is
impractical due to shallow soils over rock or for other reasons, i.e.,
mounding of backfill. Pipelines designated for winter use shall be
buried the greater of (1) a minimum of three (3) feet, (2) below the
depth of the anticipated frost line or (3) minimum depth shown on the
drawings or specified in the ADDITIONAL SPECIFICATIONS.

To minimize thermal stresses, installation should be planned to avoid
exposing pipe to high temperatures prior to backfilling.

METAL PROTECTION

Whenever steel tees, ells or risers are used, they shall be adequately
protected from corrosion by wrapping with plastic tape, galvanizing or
other approved corrosion preventatives. Clamps and steel fittings may
either be stainless steel or steel properly protected from corrosion.

APPURTENANCES

Pipeline appurtenances shall be of the type, size, pressure class and
material as shown on the drawings.

TESTING

Before backfilling, the pipe shall be filled with water and at design
working head or a minimum-testing head of ten (10) feet, whichever is
greater. All leaks shall be repaired and test repeated before
backfilling begins.

Plowed in pipelines shall be pressure tested at the working pressure for
two (2) hours. The allowable leakage shall not be greater than one (1)
gallon per diameter inch per mile. Should the test exceed this rate, the
defect shall be repaired until retests show that the leakage is within
the allowable limits.

BACKFILLING

All backfilling shall be completed before the pipeline is placed into
service.

The initial backfill within three (3) inches of the pipe shall be of
selected materials, free from debris, rocks or other sharp edged
material that could damage the pipe. The completed trench backfill shall
be mounded for settlement. Backfill of plastic pipe should be done after
the pipe reaches the same temperature as the water or soil. This can be
done by filling with water or by leaving the trench open overnight prior
to starting the backfill operations. Deformation or displacement of the
pipe must not occur during backfilling.

EROSION CONTROL

Disturbed areas shall be treated as listed in ADDITIONAL SPECIFICATIONS
to prevent erosion and re-establish protective cover.

ADDITIONAL SPECIFICATIONS