Current through Register No. 13, March 27, 2025
(a) The applicant
shall propose a withdrawal testing program in the minor withdrawal designation
request in accordance with
Env-Ws
387.09.
(b) The testing program in (a), above shall:
(1) Demonstrate production of the maximum
withdrawal volumes requested;
(2)
Identify impacts from the withdrawal at the wellhead;
(3) Verify that the withdrawal will not
result in adverse impacts under 180-days of continuous operation at the maximum
volumes requested in the permit application; and
(4) Provide data to justify the use of any
alternative methods for the testing program, study area definition, or
predicting impacts from the withdrawal.
(c) The applicant shall conduct a withdrawal
testing program for a withdrawal associated with bottled water in accordance
with the pumping test program in Env-Ws 389.
(d) The applicant shall conduct a withdrawal
testing program for a withdrawal associated with community water supplies in
accordance with the pumping test program in Env-Ws 379.
(e) For other withdrawals, a withdrawal
testing program shall meet the criteria identified in paragraph (f) through (q)
below:
(f) The withdrawal test
shall be conducted as follows:
(1) Where the
applicant proposes to operate an existing withdrawal in addition to the new
withdrawal to meet the water needs demonstrated in the conservation management
plan and description of need under
Env-Ws
387.05:
a. The
existing withdrawal shall be operated during testing of the new withdrawal so
that test conditions directly reflect proposed operating conditions;
or
b. The applicant shall present
data demonstrating the source of water for the existing withdrawal is not
connected to the source for the new withdrawal;
(2) Withdrawals shall be operated
continuously at constant discharge rates that do not vary more than ±5%
after the first 6 hours of pumping;
(3) The testing production rate of the new
withdrawal shall produce at least the maximum volume that will be requested in
the minor withdrawal permit application;
(4) The discharge rate from the new
withdrawal and any existing withdrawals operating as part of the test in
accordance with paragraph (1)a, above, shall be:
a. Measured using a calibrated device capable
of providing measurements accurate to within 5% of the discharge rate;
and
b. Measured every 15 minutes
for the first 2 hours and at least once every hour thereafter;
(5) Discharge measurements from
the new withdrawal and any existing withdrawal shall:
a. Not be averaged over a period greater than
one minute; and
b. Include at least
2 readings collected and recorded for each measurement; and
(6) Pumped water shall be
discharged outside the contributing area of operating wells so there is no
effect resulting from the discharged water on the environmental response to the
pumping;
(g) During
testing, withdrawals shall operate continuously for at least 48
hours.
(h) Cessation of withdrawals
after 48 hours may occur under the following circumstances:
(1) The water level in the withdrawals has
fluctuated less than one inch in any 2 hours for a period of 12 hours;
or
(2) The theoretical 180-day
drawdown of the withdrawals:
a. Does not
exceed 90% of the total available drawdown at the time of the test or 5 feet,
whichever is greater; and
b. Is
derived using the following methodology:
1.
Water level data shall be plotted as a semi-logarithmic plot of drawdown versus
elapsed time, expressed in minutes elapsed since pumping began, presented on
the logarithmic axis; and
2. A
straight line shall be:
(i) Drawn through the
data on the semi-logarithmic plot with a slope based on the data points from
the end of the pumping period; and
(ii) Used to extrapolate the drawdown for a
time of 180 days which shall be the theoretical 180-day drawdown.
(i) Water levels in the new as well as any
existing withdrawals shall be measured as follows:
(1) Water level measurements and time shall
be recorded every 8 hours, at least 24 hours before pumping begins;
(2) Water level measurements shall be
recorded immediately before pumping begins and once pumping begins, every 5
minutes for the first hour, and at least once every hour thereafter;
(3) Water level measurements shall be made
using equipment capable of measuring to the nearest 0.01 foot for the water
levels anticipated during pumping; and
(4) Water levels in any 4 acre or smaller
surface water within 150 feet of the operating wells shall be measured using a
water level staff gauge and gauge readings shall be taken just before pumping
starts and once pumping begins, every 12 hours thereafter.
(j) The applicant shall request in writing,
permission to monitor the following as part of withdrawal testing for all other
water users located within 1000 feet of the proposed withdrawal:
(1) The operating schedule of their
withdrawal; and
(2) Water levels
associated with their withdrawal.
(k) On-site precipitation data shall be
collected for the period beginning one week preceding pumping through the
recovery period.
(l) On-site
weather condition observations shall be recorded at least twice daily during
pumping and recovery.
(m) When a
withdrawal test is proposed, the proposal shall include the following:
(1) The proposed testing production rate and
the rates of any other withdrawals that will be operated as part of the test in
accordance with paragraph (f), above;
(2) A description of the construction,
location, and monitoring schedule of groundwater monitoring points;
(3) A site sketch showing the discharge
locations;
(4) Text that explains
the technical rationale for the discharge location identified in (3),
above;
(5) A description of the
construction of surface water staff gauges and a site sketch showing the
location the gauges that are used to monitor the water level of surface water
during the withdrawal testing;
(6)
A description of the method and equipment that will be used to ensure constant
pumping rates are maintained;
(7) A
description of discharge measurement methods and schedules;
(8) The anticipated operating schedule for
nearby withdrawals identified in paragraph (j) above;
(9) The anticipated withdrawal test duration
and criteria for pump shut down; and
(10) The name, telephone number, and mailing
address of the person responsible for determining whether to cease
pumping.
(n) Any
alternative testing program shall meet or exceed the criteria of the withdrawal
test specified in this section;
(o)
When an alternate testing program is proposed, the proposal shall include:
(1) The information required for testing
proposal pursuant to this section; and
(2) Information demonstrating that the
program will meet or exceed the requirements for the standard withdrawal
test.
(p) When requested
by the applicant, additional testing may be performed to verify the minor
withdrawal designation.
(q) Upon
request by the applicant, the department shall propose a scope of work for
additional withdrawal testing when:
(1) The
proposed withdrawal testing is not likely to verify minor designation status;
and
(2) Additional testing may
verify minor withdrawal designation.
#7490, eff 5-12-01; ss by #9459, INTERIM, eff 5-12-09,
EXPIRED: 11-9-09
