PERMFILE64267

• Permit No: C1981024
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 6 SEDIMENT POND REMOVAL INFORMATION
• Media Type: D
• Archive: No

individual Curve Numbers and k factors
for the soil types in the watershed by the
proportion of the watershed occupied by
each type.
For the post-mining analysis, soil parame-
ter (Curve Numbers, k factors, and type
distributions) were determined. Weighted
factors were determined as descnbed
above. These weighted factors were used
because all the soil types were assumed to
be mixed during replacement.
Ground cover data from the 1991 vegeta-
tion survey were used to determine the
post-mining CP factor, Table 2. A statisti-
cal analysis was performed on the refer-
ence areas for season variation between a
wet and normal precipitation yeaz. No
• statistical differences were found be-
tween the
•
Mahodr
two seasonal periods, therefor no adjust-
ments were required for the comparison.
During a review of the premising vegeta-
tion survey, it was determined that ground
liter was not included in this survey. For
this sediment analysis, the ground liter
form the 1991 reference area was added
to the premising vegetation cover data.
Therefor this analysis includes vegetation,
mulch, rock and soil for both pre and
post-mining conditions.
The sedimentology portion of the analysis
can be run using one of three sedimento-
logy evaluation routines. Kaiser elected to
use the Revised Universal Soil Loss Equa-
tion (RUBLE). Selection of the RUBLE
was based on the variety of slopes present
on the site.
6
:. . a ep~ .._....