**Construction Specification 724---Drainfill**

**1. Scope**

The work consists of furnishing, placing, and compacting drainfill
required in the construction of structure drainage systems.

**2. Material**

Drainfill materials shall conform to the requirements of Section 801,
Coarse Aggregate, and/or Section 802, Fine Aggregate, of the latest
edition of the Alabama Department of Transportation Standard
Specifications for Highway Construction. The gradation shall be as
indicated in section 8.

**3. Base preparation**

Foundation surface and trenches shall be clean and free of organic
matter, loose soil, foreign substance, and standing water when the
drainfill is placed. Earth surfaces upon or against which drainfill will
be placed shall not be scarified.

**4. Placement**

Drainfill shall not be placed until the subgrade has been inspected and
approved by the engineer. Drainfill shall not be placed over or around
pipe or drain tile until the installation of the pipe or tile has been
inspected and approved.

Drainfill shall be placed uniformly in layers not to exceed 12 inches
thick before compaction. When compaction is accomplished by manually
controlled equipment, the layers shall not exceed 8 inches thick. The
material shall be placed to avoid segregation of particle sizes and to
ensure the continuity and integrity of all zones. No foreign material
shall be allowed to become intermixed with or otherwise contaminate the
drainfill.

Traffic shall not be permitted to cross over drains at random. Equipment
cross-overs shall be maintained, and the number and location of such
crossovers shall be established and approved before the beginning of
drainfill placement. Each crossover shall be cleaned of all
contaminating material and shall be inspected and approved by the
engineer before the placement of additional drainfill material.

Any damage to the foundation surface or the trench sides or bottom
occurring during placement of drainfill shall be repaired before
drainfill placement is continued.

The upper surface of drainfill constructed concurrently with adjacent
zones of earthfill shall be maintained at a minimum elevation of 1 foot
above the upper surface of adjacent earthfill.

Drainfill over and/or around pipe or drain tile shall be placed to avoid
any displacement in line or grade of the pipe or tile.

**5. Compaction**

Fine aggregate drainfill shall be compacted by flooding the drainfill
material with clean water or by use of vibratory plate tampers or other
methods approved by the Engineer. Compaction of coarse aggregate will
not be required unless otherwise specified in Section 8.

**6. Testing**

The engineer shall be granted access to perform such tests as are
required to verify that the drainfill materials and the drainfill in
place meets the requirements of the specifications. These tests are not
intended to provide the contractor with information needed to assure
that the materials and workmanship meet the specification requirements.
These verification tests will not relieve the contractor of the
responsibility of performing required tests for that purpose.

**7. Measurement and payment**

***Method 1---***For items of work for which specific unit prices are
established in the contract, the volume of drainfill within the neat
lines shown on the drawings are measured and computed to the nearest
cubic yard. Where the engineer directs placement of drainfill outside
the neat lines to replace unsuitable foundation material, the volume of
such drainfill is included. The volume included is only to the extent
that the unsuitable condition is not a result of the contractor\'s
improper construction operation in the determination of the engineer.

Payment for drainfill is made at the contract unit price for each type
of drainfill, complete in place. Except as otherwise specified in
section 9 of this specification, such payment will constitute full
compensation for all labor, equipment, material, and all other items
necessary and incidental to the performance of the work.

***Method 2---***For items of work for which specific unit prices are
established in the contract, the quantity of drainfill placed within the
specified limits is computed to the nearest 0.1 ton by actual weight.
Where the engineer directs placement of drainfill outside the neat lines
to replace unsuitable foundation material, the weight of such drainfill
is included. The weight included is only to the extent that the
unsuitable condition is not a result of the contractor\'s improper
construction operation in the determination of the engineer.

Payment for drainfill is made at the contract unit price for each type
of drainfill, complete in place. Except as otherwise specified in
section 9 of this specification, such payment will constitute full
compensation for all labor, equipment, material, and all other items
necessary and incidental to the performance of the work.

Compensation for any item of work described in the contract, but not
included in the bid schedule is included in the payment for the item of
work to which it is made subsidiary. Such items and the items to which
they are made subsidiary are identified in section 9 of this
specification.

**8. Items of work and construction details**

Items of work to be performed in conformance with this specification and
the construction details therefore are:

[Bid Item 16, Drainfill]{.underline}

(1) This item shall consist of furnishing and installing the drainfill
    as shown on the drawings.

(2) Drainfill shall be size No. 57 as specified in Section 801 in the
    latest edition of the [\"Standard Specifications for Highway
    Construction\" by the
    ADOT](http://www.dot.state.al.us/internetdocs/pdfs/bureaus/construction/spec_2002/2002_aldot_spec_book.pdf).

(3) Measurement and payment shall be by Method .