3.7
TESTS
3.7.1
Pump Test
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NOTE: A six-hour continuous test is ordinarily
adequate to determine that a well is performing
properly. It is recommended that the specified
draw-down (or discharge) during a routine test be
approximately 1.5 times the estimated head (or
discharge) for which the system is designed. In
addition to the routine tests, the wells may be
pumped for longer periods and at various draw-downs
or discharges to secure, or to check, design data.
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Upon completion but before acceptance, each well shall be subjected to a
pump test of which a sand test will form a part. The Contractor shall
provide a [deep well turbine] pump, capable of producing the specified
drawdowns over periods of time sufficient to satisfactorily perform the
pump test specified herein. The intake shall be set 3 m 10 feet below the
maximum expected drawdown in the well. The amount of sand should be
measured after each test. The pump shall be complete with either gasoline,
diesel, or electric motor of adequate size. In case an electric motor is
used, the Contractor shall provide, without additional cost to the
Government, the electric power and the necessary wiring. The Contractor
shall provide an open tube or other approved means for accurately
determining the water level in the well. The Contractor shall furnish and
install an orifice meter of approved design or other approved equipment for
the purpose of measuring the discharge from the well during the pumping
test. The Contractor shall furnish, install, or construct the necessary
pipe discharge line, troughs, or ditches necessary to dispose of the
pumping test discharge a sufficient distance from the work area to prevent
damage. The tests will be conducted under the direction of the Contracting
Officer and may be made as soon as each well is completed [and adjacent
Government installed piezometer tubes are operational]. Test data will be
recorded by Government personnel. The Contractor shall test each well by
pumping continuously for a minimum of [6] [_____] hours. Prior to starting
the pump test all material shall be removed from the bottom of the well.
The pumping shall be at a rate [of [_____] L/s gpm][sufficient to produce
approximately [_____] m feet of draw-down]. If the test is interrupted,
other than by order of the Contracting Officer, prior to the completion of
the specified period of continuous operation, the test shall be re-run. In
addition to the required pumping test, the Contracting Officer may direct
the Contractor to perform additional pump tests. Such additional testing
shall conform in general to the requirements specified herein except that
the duration of the tests and the approximate draw-down will be determined
by the Contracting Officer. In the event that sand or other material
collects in the well as a result of the pump test, accurate measurements
shall be taken as to the quantity of material in the well and all such
material shall be removed by the Contractor. Upon completion of the pump
test, the Contractor shall remove all equipment, discharge lines,
electrical lines, lumber, and debris, and shall backfill any excavated
areas with impervious material.
3.7.2
Sand Test
As part of each Pump Test or at the end of each intermittent pumping a
SECTION 02525A
Page 23
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