Unreviewed Disposal Question Evaluation: Subsidence Study for Non-Crushable Containers in Slit Trenches (U) Page: 5 of 49
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2. If the amount of the waste area that contains non-crushable containers exceeds 10 percent for
two adjacent Slit Trench disposal units and requirement 1 above is not satisfied, then the
allowable non-crushable percent area can be increased from 10% to a maximum of 20%. If
the allowable non-crushable percent area is increased to more than 10%, then the maximum
allowable sum-of-fractions must be reduced by multiplying by 0.87 (1/1.15). This
requirement only applies to groundwater pathway time intervals that occur after placement of
the final cover (currently 125 years). The groundwater pathway time intervals are as follow:
a. GW1 - 0 to 12 years
b. GW2 - 12 to 100 years
c. GW3 - 100 to 1000 years.
Therefore, this requirement for current limits only applies to GW3.
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THONG, HANG. Unreviewed Disposal Question Evaluation: Subsidence Study for Non-Crushable Containers in Slit Trenches (U), report, March 15, 2005; South Carolina. (digital.library.unt.edu/ark:/67531/metadc782012/m1/5/: accessed May 26, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.