NATURAL RESOURCES CONSERVATION SERVICE

**Idaho**

**CONSTRUCTION SPECIFICATIONS**

**FOR**

###### SPRING DEVELOPMENT

\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

(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
are considered as a part of this specification. Construction activities
shall be in accordance with applicable OSHA regulations.

INSTALLATION

Disturbance of the site shall be limited to that needed to complete the
installation. Sensitive areas that are flagged in the field or noted on
the drawings shall be avoided.

Excavation for pipe trenches, spring boxes and appurtenances shall be as
needed to install the appurtenant components as noted on the drawings.

Backfill shall be with materials shown on the drawings. Gravel and sand
filters when specified shall be installed as to avoid contamination with
other materials.

Backfill materials around and over pipelines and around spring boxes
shall be hand compacted to a depth of at least 2-feet over the top of
the pipe and within 2 feet of the structure.

On horizontal well installations the casing pipe shall be cemented in
with pressure placed grout along side the casing. The grout or cement
slurry shall have a water--cement ratio by volume of not more than 1:1.
After placement, grout shall be allowed to set for a minimum of 12 hours
before any further drilling is performed. The installation of the
plastic pipe in the drill hole shall be done in a manner to allow a
continuous pipe tube. Joints shall be glued.

PIPE MATERIALS

The collector conduit shall be of the size, material type as shown on
the drawings. Unless otherwise specified, pipe shall conform to one of
the following specifications:

-   Corrugated polyethylene drainage tubing ASTM F 405 or F 667, AASHTO
    M 252 or AASHTO 294

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-   Corrugated polyvinyl chloride tubing ASTM F 800

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-   Polyvinyl chloride corrugated sewer pipe ASTM F 949

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-   Polyvinyl chloride sewer pipe ASTM D 2729

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-   Polyvinyl chloride pipe ASTM D 3033 or D 3034

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-   Concrete pipe for irrigation and drainage ASTM C 118

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-   Reinforced concrete pipe ASTM C 76

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-   Corrugated metal pipe ASTM A 760, A 761 A 762, A 849, A 875, A 885,
    A 929, B 745, B 746 or B 790

The casing pipe for horizontal wells shall be standard weight,
galvanized steel pipe conforming to ASTM A 120. The liner pipe shall be
Schedule 80 PVC 2110 plastic pipe conforming to ASTM D 1785. The pipe
through the water bearing formation shall be either slotted or
perforated with a minimum of 2 square inches of opening area per linear
foot of pipe.

CONCRETE

Concrete work under these specifications shall be constructed to the
dimensions, lines, and grades as shown on the drawings. The subgrade for
concrete shall be prepared as shown on the drawings or as directed by
the technician.

[Concrete compressive strength]{.underline} shall be at least 4000 psi
at 28 days. The mix shall be in accordance with ASTM C 94 and this
specification. When requested by the Technician the supplier shall
furnish design mix and cylinder break test data.

[Cement]{.underline} shall be low alkali Type II Portland cement.

[Coarse aggregate]{.underline} shall be maximum size of 1-1/2 inches per
designations of ASTM C 33.

[Air entrainment]{.underline} conforming to the requirements of ASTM C
260, shall be used. The air content shall be 5 to 7 percent.

[Forms]{.underline} shall conform to the shapes, lines, and dimensions
as shown on the drawings. They shall be braced and/or tied together to
maintain position and shape and; be sufficiently tight to prevent
leakage of mortar. Forms shall be thoroughly oiled or wetted and cleaned
of debris prior to placement of concrete. [Forms shall not be removed
without the approval of the Technician]{.underline}.

[Reinforcing steel]{.underline} shall be deformed bars and be free from
rust, oil, grease, paint or other deleterious matter. Items to be
embedded in the concrete shall be positioned accurately and firmly
anchored to prevent displacement during placement of concrete.

[Placement]{.underline}. The concrete shall be deposited as closely as
possible to its final position and shall be worked into the corners and
angles of the forms and around all reinforcement and embedded items in a
manner to prevent segregation of aggregates or excessive laitance.
Consolidation of concrete may be accomplished by means of internal type
mechanical vibrators, rodding, spading, or hand tamping.

[Construction joints]{.underline} shall be provided as shown in the
plans or as approved by the engineer. Joints shall be thoroughly cleaned
and laitance removed before a new pour is made. Each joint shall be
wetted immediately before the placing of new concrete.

[Finishing]{.underline}. After the concrete has been consolidated, the
unformed surfaces shall be given a wood float finish. Immediately after
form removal, formed surfaces shall be cleaned of all defective concrete
and effectively repaired. Snap ties shall be removed and the holes
mortared.

[Protection and Curing]{.underline}. Concrete shall be prevented from
drying for a curing period of at least 7 days after it is placed.
Exposed surfaces shall be kept continuously moist for the entire period.
For formed surfaces, the protection may be accomplished by leaving the
forms in place and keeping them wet for the entire curing period.
Moisture shall be maintained by sprinkling, flooding, or fog spraying or
by covering with continuously moistened canvas, cloth mats, straw,
earth, or other approved material. In lieu of water curing, the concrete
shall be cured by spraying with an approved sealing compound. The
sealing compounds shall be applied as soon as practicable after the
concrete finishing is completed. All surfaces shall be kept moist until
the compound is applied.

[Concreting in Cold Weather]{.underline}. Before any concrete is placed,
all ice, snow and frost shall be completely removed from all surfaces to
be in contact with the new concrete and the temperature of these
surfaces shall be raised to as close as may be practical to the
temperature of the new concrete that is to be placed thereon. No
concrete shall be placed on a frozen subgrade or on one that contains
frozen materials. Concrete shall not be mixed or placed when daily
minimum atmospheric temperature is less than 40 degrees F., unless
facilities are provided to ensure the adequate protection of the
concrete. Temperature of the concrete at the time of placing shall not
be less than 50 degrees F. nor more than 90 degrees F. The temperature
of all aggregates and mixing water shall be not more than 100 degrees F.
when introduced into the mixer. The use of accelerators or antifreeze
compounds will not be allowed.

##### 

##### FILTER MATERIALS

Sand-gravel filters shall be clean, hard material which does not
decompose in air or water. Unless otherwise specified materials shall be

1-1/2 inch maximum size with 90 percent by weight passing a ¾ inch sieve
and with less than 10 percent passing a #60 sieve (0.25 mm).

Geotextile fabric materials shall be of the weight, type and opening
size as shown on the drawings or the ADDITIONAL SPECIFICATIONS.

LUMBER

All lumber used shall be redwood, red cedar or be treated with a cold
soak or pressure wood preservative meeting the requirements of ASTM D
1760 for underground burial.

FENCING

[Posts]{.underline} may be galvanized steel or wood. Steel posts should
be a minimum of 6.5 feet long and wood posts a minimum of 7.5 feet long.
All wood materials except Orange Osage, Western Red Cedar, Juniper and
Black Locust that have contact with the soil shall be treated with an
EPA-registered wood preservative. Wood posts shall be treated from the
butt end of the post to a distance of at least 30 inches for line posts
and 36 inches for all corner, gate and brace posts.[^1]

Minimum top diameter for wood posts is 4 inches. All posts shall be
firmly set into the ground, braced at all corners and turns, and spaced
as shown on the drawings, but not to exceed 20 feet.

[Wire]{.underline}. Barbed wire shall be a minimum of two strands of
12-1/2 gage, galvanized wire. Woven wire shall be galvanized, aluminum
or plastic coated. Top and bottom wires shall be a minimum of 11-gage
aid intermediate line and stay wires shall be a minimum of 14-1/2 gage.

[Hardware]{.underline}. Wire ties, clamps, staples, and related fence
hardware shall have equivalent coating to the fencing being installed.

[Pole or timber fence]{.underline} equivalent to standard barbed wire
fence in usefulness and durability may be used as an alternate when
authorized by the responsible technician.

SEEDING

Seed the disturbed areas unless suitable vegetation already exists.
Seedbed preparation, seed mixture, fertilizer, mulch, and application
rates shall be in accordance with the attached ADDITIONAL SPECIFICATION
for "Seeding".

CLEAN-UP

Waste earth material shall be smoothed and seeded.

ADDITIONAL SPECIFICATIONS:

[^1]: ^1^The preceding two sentences were inserted by the State
    Conservation Engineer in 2005 to reflect new information on wood
    preservation treatments.