shall be a total open area not less than [_____] square millimeters inches
per linear meter foot of [_____] mm inch diameter relief well. The slots
or groups of slots shall be distributed in a uniform pattern around the
periphery of the pipe and shall be oriented with the length of the slot
[parallel to,] [normal to,] [or] [diagonal with] the axis of the pipe.
Drilled or punched openings shall be [_____] mm inch in diameter and shall
provide a total open area not less than [_____] square millimeters inches
per linear meter foot of [_____] mm inch diameter well screen. The pattern
of the openings shall be uniformly spaced around the periphery of the pipe.
2.1.4
Stainless Steel Well Screen
The well screen and fittings shall be fabricated entirely from stainless
steel conforming to ASTM A 312/A 312M, Type 304, 304-L, 316 or 316-L. The
well screen shall be of stainless steel with a keystone wire-wrapped
continuous slot strainer equivalent to [_____] [that manufactured by
[Howard Smith Screen Company, Houston, TX, telephone (713) 869-5771]
[Johnson Screens, St. Paul, MN 55164, telephone (612) 636-3900]]. [The
well screen, pipe, and fittings shall have a minimum collapse strength of
[_____].] [The screen, pipe, and fittings shall have a clear inside
diameter of [_____].]
2.1.4.1
Couplings
Couplings for the stainless steel well screen shall consist of the same
material as the well screen and shall be threaded, flanged, and/or fitted
with a welding ring. The couplings shall conform in design to the
couplings recommended by the manufacturer of the well screen.
2.1.4.2
Perforations
The [_____] mm inch diameter well screen shall have a number [_____] slot,
[0.0_____] mm inch open slot. There shall be a total opening of not less
than [_____] square millimeters inches per meter foot of [_____] mm inch
diameter well screen.
2.1.5
Tailpipe for Well Screen
The tailpipe for each well screen shall be made of the same material and at
least the same minimum thickness as the riser pipe and shall include a
bottom plug. Tailpipes shall be a minimum of [1] [_____] m [3] [_____]
feet in length and fastened to the bottom of the screen in an approved
manner.
2.2
RISER PIPE
The relief well riser pipe material and method of manufacture shall conform
to the requirements specified in paragraph WELL SCREEN, except that the
screen perforations or opening shall be omitted. The relief well riser
pipe diameter and discharge details shall be as shown. Couplings to the
well screen and between riser pipe sections shall be as specified in
paragraph COUPLING.
2.3
FILTER PACK
Material for the filter pack around the riser pipes and screens shall be a
[washed gravel] [washed sand] [dry processed sand] composed of hard, tough,
and durable particles free from adherent coating. The filter pack shall
not be crushed stone. The filter pack material shall contain no
SECTION 02525A
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