PERMFILE115349

• Permit No: C1981020A
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Section_Exhibit Name: Volume 6 SECTION 1.0 TO SECTION 2.0
• Media Type: D
• Archive: Yes

2-26
• This channel will then be permanently relocated towards the
north side of the valley as detailed in Section 2.2.6. The
existing channel will be smoothed and graded to form a "V"
section sloping toward the sediment pond.
The foundation of the refuse pile will then be made imperme-
able through the use of a man-made liner or through compaction
and addition of bentonite. Test borings in the refuse area
show that the soils are generally an ML type soil which is
relatively impermeable. Data given in the U.S. Department
of the Interior technical publication Design of Small Dams
gives an average permeability for this soil group of 0.59+
0.23-6 centimeters per second. It is therefore anticipated
that these soils can be compacted to provide a layer whose
permeability is lower than 1 x 10-6 centimeters per second.
Further studies will be conducted upon a representative num-
• ber of samples to confirm permeability of compacted soils
and will be submitted to CMLR one year prior to construction
of the refuse disposal area. If these studies indicate,
Salt Creek will take measures to insure that permeability
will be less than 1 x 10-6 centimeters per second, such as
the addition of bentonite.
As indicated on Plate 7 of Appendix Bs, consolidation of
soils in the foundation of the refuse area could have a
detrimental effect on the impermeable membrane. If dif-
ferential settling of the foundation occurs, the membrane
could be sheared. Salt Creek will initiate studies to
determine the effects of settlement upon the impermeable
liner. Data will be submitted to CMLR one year prior to
construction of the refuse area indicating the magnitude
of settlement and possible shear zones so that the founda-
tion and membrane can be designed to eliminate the possi- .
• bility of refuse leachate coming in contact with the ground-
water.
1/17/83