UNITED STATES DEPARTMENT OF AGRICULTURE

NATURAL RESOURCES CONSERVATION SERVICE

OREGON

[CONSTRUCTION SPECIFICATION]{.underline}

[CS-60 WELL]{.underline}

60.1 [SCOPE]{.underline}

> The work shall consist of furnishing and installing materials to
> construct and test a water supply well.

60.2 [DRILLER'S LOG]{.underline}

> A well log shall be maintained to accurately record the location of
> the top and bottom of each stratum, the fluids encountered, the
> encasement and the completion record for each well. A copy of the log
> shall be submitted to the OREGON State Department of Environmental
> Quality.

60.3 [MATERIALS]{.underline}

> Steel pipe, copper, reinforced plastic mortar, fiberglass or plastic
> may be used for well casings in drilled wells. Steel pipe casing shall
> be used for driven wells. The well casing pipe shall be marked
> according to the applicable ASTM specification for the material used.
>
> a\. [Plastic Pipe Casing]{.underline} - Plastic casing shall be
> acrylonitrile-butadiene-styrene (ABS), polyvinyl chloride (PVC), or
> styrene-rubber (SR) and shall conform to
>
> ASTM Specification F-480.
>
> Plastic well casing shall be no larger than 12 inches nominal
> diameter, or smaller than 2 inches nominal diameter.
>
> Where water is to be used for human consumption the requirements of
> the National Sanitation Foundation (NSF) shall be met. Plastic pipe
> will be suitably marked.
>
> Polyvinyl chloride (PVC) pipe will be schedule 40, 80, or 120 and
> shall meet ASTM Specification D-1785.
>
> Threaded or solvent-welded couplings for plastic pipe shall have a
> strength equal to or greater than the pipe to which they are attached.
>
> b\. [Fiberglass]{.underline} - Fiberglass well casing shall meet the
> requirements of ASTM Specification
>
> D-2996. The joints shall meet ASTM Specification F-480. The modulus of
> elasticity shall be certified.
>
> c\. [Concrete]{.underline} - Concrete well casings shall be reinforced
> and shall meet or exceed the
>
> requirements of ASTM Specification C-76 Class II for reinforced
> concrete culvert pipe.
>
> d\. [Reinforced Plastic Mortar]{.underline} - Reinforced plastic
> mortar, RPM, well casings shall equal or exceed the requirements of
> ASTM Specification D-3517.
>
> e\. [Steel Casing]{.underline} - Steel casing used in driven wells
> shall be provided with a drive shoe of
>
> approved type where necessary. Casing shall have welded or threaded
> joints.
>
> Welding of steel casings shall be done in accordance with the
> standards of the American Welding Society. Sufficient passes of
> continuous weld shall be applied so that the finished surface at the
> area of fusion is built up to the surface of the adjoining pipe.

60.4 [WELL SCREENS OR INTAKE SECTIONS]{.underline}

> All wells finished in unconsolidated aquifers (sand, gravel, etc.)
> shall be equipped with manufactured screen sections, well points, or
> field perforated sections. The screen or slotted casing section shall
> be protected with a device immediately above the intake section, if
> necessary, to prevent well stabilizer materials from entering the
> intake section. Where practical, the top elevation of the intake
> section should be below the lowest drawdown.

60.5 [GRAVEL PACK]{.underline}

> Artificial filters (gravel pack) are specified around the well intake
> when conditions exist that will allow sand to enter the well. The need
> and gradation of the filter will be specified based on an analysis of
> the water bearing sands, and approved by the technician. The filter
> material shall extend a minimum of 10 feet above the top of the
> perforated or screened section and shall extend through the length of
> the water bearing formation.

60.6 [ALIGNMENT]{.underline}

> Drilled vertical wells shall be round, plumb, and aligned to permit
> satisfactory installation and operation of a pump.

60.7 [DEVELOPING]{.underline}

> The well shall be developed until it stops producing detrimental
> quantities of solid particles when the continuous discharge rate is
> approximately 20 percent greater than the anticipated normal
> production rate.

60.8 [WORKMANSHIP]{.underline}

> The well casing pipe, couplings, and screens shall be homogeneous
> throughout and shall be free of visible cracks, holes, foreign
> materials, or other injurious defects. The well casing pipe,
> couplings, and screens shall be as uniform in color, density, and
> other physical properties as is commercially possible.

9.  [ITEMS OF WORK AND CONSTRUCTION DETAILS FOR THIS
    PROJECT]{.underline}