Current through Register No. 13, March 27, 2025
(a) The applicant shall produce an estimate
of the delineation of a study area and describe it in the minor designation
request in accordance with
Env-Ws
387.09.
(b) For a withdrawal that is not for bottled
water or a community water system, the study area may be estimated as a circle,
centered on the wellhead, with a 4000-foot radius.
(c) For a withdrawal that is for bottled
water or a community water system, the applicant shall delineate an estimate of
the study area.
(d) The study area
estimate in (c) above, shall:
(1) Be based on
the hydrologic conceptual model developed for approval of the source under
Env-Ws 379 for community water systems or Env-Ws 389 for bottled water sources,
whichever is appropriate, based on existing information, including but not
limited to:
b. Historic water level data;
c. Department records for existing water
users and resources including testing and production reports;
e. National resource conservation service
maps; and
f. United States
geological survey geologic, bedrock lineament, and stratified-drift aquifer
maps;
(2) Delineate the
extent of the study area by:
a. Assuming a
conceptual hydrologic model condition of 180 days of continuous pumping at
maximum volumes without recharge from rainfall or snowmelt; and
b. Including the following items:
1. The maximum extent of the cone of
depression created by the withdrawal;
2. The maximum extent of the recharge area
for the withdrawal; and
3. The
downgradient area of the withdrawal;
(3) Identify the sources of information used
and interpreted in order to develop the study area estimate; and
(4) Refine the estimate based on results from
withdrawal testing performed in accordance with
Env-Ws
387.13.
(e) The downgradient area of the withdrawal
described in (d) above, shall include:
(1)
The area where water taken by the withdrawal would flow if the withdrawal did
not operate;
(2) The area that will
provide water to the downgradient area when the withdrawal is operating;
and
(3) The point where the amount
to be withdrawn is negligible when compared to the amount of water crossing the
boundary using one of the following methods:
a. An existing or new delineation of a
watershed large enough so that the size of the entire study area for the
withdrawal is at least 10 times the size of the recharge area for the
withdrawal;
b. An existing or new
delineation of a watershed where the amount of water crossing the downgradient
boundary, that is, leaving the study under current conditions, is at least 10
times the amount to be withdrawn; or
c. An alternative method of estimating a
study area, provided it relies on conservative assumptions, is demonstrated as
appropriate for the site by testing results and is clearly explained and
justified.
(f) The estimate of the study area described
in paragraph (c)-(e) above, and each of its components shall be presented on a
map as described below:
(1) The map is at a
scale of 1:24000 or 1:25000;
(2)
The base map information wholly depicts the data included on a United States
geologic survey topographic map or a department geographical information system
map; and
(3) The map figure
includes a map title, date, scale, and north arrow.
#7490, eff 5-12-01; ss by #9459, INTERIM, eff 5-12-09,
EXPIRES: 11-9-09
