PERMFILE52017

• Permit No: C1981012A
• IBM Index Class Name: Permit File
• Doc Date: 11/16/2006
• Section_Exhibit Name: Section 2.05 Operation and Reclamation Plan
• Media Type: D
• Archive: Yes

• The two curves become essentially identical, again, after about 0.7 pore
volumes of effluent are produced. The data indicate that practically all
of the readily soluble materials were leached from the samples by the
time 1.5 pore volumes of effluent were produced.
The effluent from both tests was periodically sampled for chemical
analysis. The results for samples collected at the beginning, near the
midpoint, and near the end of the tests are shown in Table 31, Results
of Chemical Analysis.
The change in water quality in the river resulting from waters
passing through the backfilled channel is estimated from the mass balance
equation:
CdQd = CuQu + CbQb
where C is concentration, Q is discharge rate, and the subscripts d, u
and b refer to downstream, upstream and backfill, respectively. Because
the backfilled channel will not change the quantity of flow in the river,
the discharges upstream and downstream of the backfilled channel are
• equal. Therefore, the mass balance equation is rewritten as:
C-Cd-Cu=Qb/Qu
so that the change in concentration can be calculated directly.
Estimates of high, low and average discharge for the river have
been made in previous studies and will be used here for Qu. The
following two subsections present the estimations of Qb and Cb. In the
final subsection, equation 2 is used to compute the change in water
quality.
The elevation of the ground water in materials adjacent to the
river is approximately equal to the elevation of the water surface in the
stream. It is expected, therefore, that the lower portion of the
backfill placed in the channel will be wetted and that ground water will
flow through the wetted section in the direction of the axis of the old
channel. The area of the wetted section will change seasonally as
directed by the
•
(Revised OS/11i94)
2.05-69