Or. Admin. Code § 690-217-0025 - Pump Test Specifications for Wells Other than Flowing Artesian Wells
The pump tests for wells other than flowing artesian wells shall be conducted such that the following minimum specifications are met:
(1) The well shall be idle for a
period of at least sixteen hours prior to the pump test.
(2) The static water level in the well shall
be measured within the hour prior to the test at least three times no less than
twenty minutes apart.
(3) The
pumping phase of the test shall be at least four hours.
(4) The pump discharge shall be controlled as
much as possible to maintain a constant rate during the test and shall be as
close as reasonably possible to the anticipated pumping rate during normal use
of the well. Discharge shall be recorded at the beginning of the test and once
every hour thereafter.
(5) Water
level measurements during the first ten minutes of pumping shall be timed no
more than two minutes apart. Water level measurements from ten to thirty
minutes of pumping shall be timed no more than five minutes apart. After 30
minutes of pumping, drawdown measurements shall be taken no more than 15
minutes apart for the duration of the test.
(6) After pumping stops, water level
measurements shall be taken for four hours or until the well reaches 90 percent
recovery from the maximum drawdown, whichever occurs first. Recovery water
level measurements shall be taken on the same schedule as described in section
(5) of this rule for drawdown measurements.
Notes
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