placed at the top of the bentonite seal, to provide an additional barrier
to any downward migration of grout.
2.5
CEMENT AND BENTONITE GROUT
2.5.1
Cement Grout
Cement grout shall consist of Portland cement conforming to ASTM C 150,
Type I or II, sand and water. Cement grout shall be proportioned not to
exceed 2 parts, by weight, of sand to 1 part of cement with not more than
23 liters 6 gallons of water per 42.6 kg 94 lb bag of Portland cement, with
a mixture of such consistency that the well can be properly grouted. No
more than 5 percent by weight of bentonite powder may be added to reduce
shrinkage.
2.5.2
Bentonite Grout
High-solids bentonite grout shall be made from sodium bentonite powder
and/or granules. Water from an approved source shall be mixed with these
powders or granules to form a thick bentonite slurry. The slurry shall
consist of a mixture of bentonite and the manufacturer's recommended volume
of water to achieve an optimal seal. The slurry shall contain at least 20
percent solids by weight and have a density of 4.3 kg/L 9.4 lb/gallon of
water or greater.
2.6
PERMANENT PUMP
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NOTE: The pump and motor diameter should be at
least 25 mm (1 inch) smaller than the inside
diameter of the well screen or casing, whichever is
smaller, in order to allow it to be removed for
servicing after buildup of scale on the outside of
the pump and inside of the well screen and casing.
Pump components need to be compatible with the
contaminants of concern, when installed at an HTRW
site. A permanent pump should not be specified until
it is known how much the well will produce.
The
installation of the permanent pump may need to be in
a separate section, (refer to UFGS 11212A PUMPS:
WATER, VERTICAL TURBINE).
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Permanent pump shall be an approved [submersible] [jet] [or] [_____] type
with a capacity sufficient to deliver [_____] L/s gpm.
The pump shall be
connected to the pump controls by a three-wire drop line. Piping for the
well drop line shall be [polyethylene plastic pipe conforming to ASTM D 2239
][galvanized steel pipe conforming to ASTM A 53/A 53M]. The pump shall
operate on [208] [_____] volts, 60 Hz, [3] [single]-phase power, and the
motor shall be of sufficient size to operate the pump under the maximum
operating conditions without exceeding its rating. Pump shall be equipped
with necessary controls to provide for automatic operation of the pump.
The pump and motor unit shall be no larger than [_____] mm inches in
diameter at any point.
2.7
CONTAINERIZATION OF DEVELOPMENT WATER, AND DRILL CUTTINGS
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NOTE: If installing extraction, or injection wells
SECTION 02521
Page 20
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