**NATURAL RESOURCES CONSERVATION SERVICE**

**Idaho**

**CONSTRUCTION SPECIFICATIONS**

**FOR**

**WASTE STORAGE STRUCTURE**

**(REINFORCED CONCRETE)**

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(Owner/Operator)

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(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 U.S. Department of Labor, Occupational
Safety and Health Administration (OSHA) regulations.

EXCAVATION

The foundation area will be excavated to the lines and grades shown on
the drawings or as staked in the field. Any over-excavation will be
backfilled with select material and compacted to the density of the
surrounding material.

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 shall be at least 4000 pounds per square
inch (psi) at 28 days. The mix design shall be in accordance with ASTM C
94 and this specification. The concrete shall be proportioned to include
not less than six (6) sacks cement per cubic yard of concrete, except
fly ash may be used as substitution for not greater than 15 percent of
the Portland cement. Ready-mix concrete suppliers can precertify their
concrete mix. When a precertified mix is used, the mix number will be
shown on the concrete delivery ticket. Non certified ready-mix suppliers
shall furnish mix design and concrete cylinder test break data for
engineer approval prior to placement.

Cement shall be low alkali Type II or IIA Portland cement.

Fly ash shall conform to requirements of ASTM C 618, as applicable.

Coarse aggregate shall be a maximum size of 1-1/2 inches per
designations in ASTM C 33.

Air entrainment conforming to the requirements of ASTM C 260 shall be
used. The air content shall be 5 to 7 percent.

Forms 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 deformed bars shall meet the requirements of ASTM A
615 and welded wire reinforcement shall meet the requirements of ASTM A
185. All reinforcement shall 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
the placement of concrete. The minimum splice length for deformed bars
is 30 bar diameters, and for welded wire mesh the larger of six (6)
inches or two (2) mesh spacings.

Polypropylene fibrillated fiber concrete reinforcement shall be 100
percent virgin polypropylene fibers containing no reprocessed olefin
materials. Material shall meet requirements of ASTM C 1116, Type 111,
4.1.3 and ASTM C 1116 (Ref. ASTM C 1018) Performance Level 1, I5
outlined in Section 21, Note 17, with an average minimum Residual
Strength of 50 psi, of four (4) beams from a single batch. The
individual fibers shall have a graded length of no less than 3/4 to
1-1/2 inches. Where a rough concrete finish will be used, fiber lengths
of 1 to 1-1/2 inches are preferred. When specified for use, fibers shall
be added to the concrete mix at a minimum rate of 1-1/2 pounds per cubic
yard of concrete. The fibers shall be blended into the concrete mix
according to the manufacturer's specifications. The concrete supplier
shall furnish a copy of the manufacturer's technical data to verify
compliance with these requirements.

Snap ties shall be equipped with cones, she-bolts or other devices that
permit their removal to a depth of at least 1-inch without injury to the
concrete.

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 shall be
accomplished by means of internal type mechanical vibrators, rodding,
spading or hand tamping. Concrete slump shall be in the range of three
(3) inches, plus or minus one (1) inch, unless cylinder test break data
is submitted showing that compressive strength can be achieved with the
higher slump.

Construction joints 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.

Expansion and contraction joints shall be located as specified on the
drawings. When specified, waterstops shall be placed in each expansion
contraction joint. The waterstop shall be non-metallic. Installation
shall be in accordance with specific manufacturer's specifications.
Waterstops shall be anchored to prevent displacement during placement of
concrete.

Finishing. After the concrete has been consolidated, the unformed
surfaces shall be given a wood float or waffle type 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. Concrete shall be prevented from drying for a
curing period of at least seven (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
compound shall be applied as soon as practicable after the concrete is
finished. The sealing compound shall meet or exceed the requirements of
ASTM C 309. All surfaces shall be kept moist until the compound is
applied.

Concreting in Cold Weather. 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 use of accelerators or antifreeze compounds will not be
allowed]{.underline}.

BACKFILL

Backfill materials shall be free from rocks, stones, sod, brush, roots
or other perishable or unsuitable material. Cobbles and rock fragments
having a maximum dimension of more than three (3) inches shall not be
used within one (1) foot of the structure. To the extent they are
suitable, excavated materials will be used to complete necessary
backfills.

The moisture content of fill material shall be maintained within the
limits required to prevent the adherence of the fill material to the
treads and tracks of equipment and ensure the crushing and blending of
the soil clods. Generally, when soil material is squeezed in the hand it
will retain a ball shape, but there will not be free water on the
surface. Supplemental water, when required, shall be applied to get
water uniformly dispersed throughout the fill material.

Fill placed around structures will be brought up at approximately
uniform height on all sides of the structure. Hand directed tamper
compacted fills shall be placed in layers not exceeding four (4) inch
thickness prior to being compacted. The backfill material shall be
compacted to a density equal to that of the adjacent ground. Heavy
compaction equipment shall not be operated within two (2) feet of any
structure. Hand directed tampers or compactors shall be used on areas
not accessible to heavy compaction equipment and within two (2) feet of
any structure. The passage of heavy equipment will not be allowed over
any type of conduit until the compacted backfill has been placed a
minimum of two (2) feet over the top of the pipe. The layer thickness
for equipment compacted fills shall not exceed eight (8) inches prior to
compaction.

Compaction of backfill adjacent to structures shall not be for at least
ten (10) days following the placement of the concrete.

CONDUITS

##### Conduits shall be new pipe of the type, class and size as shown on the drawings. Any damage to protective coatings shall be repaired prior to backfilling. Repairs shall be in accordance with manufacturer's recommendations. Conduits shall be firmly and uniformly bedded throughout its length and shall be installed to the lines and grades shown on the drawings and/or staked in the field.

DRAIN FILL

When gravel bedding under the floor and/or sidewall drainage is shown on
the drawings, the fill material shall conform to the requirements of
ASTM C 33.

METAL

Metal used for gratings, screens, frames for openings, etc. shall be
"merchant" or "commercial" quality unless otherwise noted. All steel
members shall be painted with two (2) coats of synthetic primer paint
and one (1) coat of aluminum paint or equivalent protective coatings.

CLEAN UP

The site shall be cleared of all unused materials, forms etc. needed for
the construction. Waste earth material shall be smoothed and seeded.

ADDITIONAL SPECIFICATIONS