Beauheim 1987 - Waste Isolation Pilot Plant - U.S. Department of ...

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Figure 5-61 WIPP-l8/Culebra Slug-Test Plot
Figure 5-62 shows a semilog plot of the falling-head
slug-test data, along with the best-fit type curve. This
fit provides a transmissivity estimate of 0.60 ftz/day
(Table 5-3).
5.2.2.13 WIPP-21. To evaluate the transmissivity
of the Culebra at WIPP-21, a falling-head slug test
lasting approximately 120 hr was initiated on July 11,
1986. The fluid-pressure data from this test are
reported in Saulnier et al. (1987). About 99% of the
induced pressure differential was dissipated during
the test. Figure 5-63 shows a semilog plot of the
falling-head slug-test data, along with the best-fit type
curve. This fit provides a transmissivity estimate of
0.25 ftzlday Vable 5-3).
5.2.2.14 WIPP-22. The transmissivity of the
Culebra at WIPP-22 was also evaluated by
performing a falling-head slug test. The test was
initiated on June 19, 1986, and lasted approximately
75 hr. The fluid-pressure data from this test are
reported in Saulnier et at. (1987). About 98% of the
induced pressure differential was dissipated during
the test. Figure 5-64 shows a semilog plot of the
falling-head slug-test data, along with the best-fit type
curve. This fit provides a transmissivity estimate of
0.37 ftz/day (Table 5-3).
5.2.2.15 WIPP-30. Mercer (1983) reported the
transmissivity of the Culebra at WIPP-30 to be
0.3 ft2/day, based on a slug test performed by the
USGS in 1980 (Richey, 1987). Verification of this
value was considered warranted by two
observations. First, WIPP-30 lies in an area where no
halite is present beneath the Culebra in the unnamed
lower member. At every other location where the
Culebra has been tested and no halite is present in
the unnamed member, the Culebra is fractured and
has a transmissivity of at least 8 ft*/day (Mercer,
1983, and this report). Second, water-level
responses observed in WIPP-30 to pumping at WIPP-
13, 3.5 miles away, have led to an interpreted
apparent transmissivity of 28 ft2/day for the Culebra
between WIPPSO and WIPP-13 (Beauheim, 1987b).
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