_GENERAL DOCUMENTS - C1981017 ‎(229)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎ 1999 Correspondence
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

the failure. The side slopes of the failure were flattened with a shovel, and the area was
seeded.
The Facilities area, including the Huntsman Project Area were inspected for compliance
with our Stormwater permit which covers this area. Repairs to the silt fence at the base
of the Huntsman Project area were made. Otherwise, the area was in compliance with the
permit.
The Dutch Creek Diversion, constructed in the late fall of 1998 was observed. Although
the spring runoff had just begun, the Diversion channel was already beginning to adjust
to the increased flows. Some scouring was observed near where the Diversion
intersected the Dutch Creek Channel. Aggradation was observed to be occurring near the
first bend in the Diversion. Below this point, step pools had begun to form. No impact to
the north side of Coal Creek, opposite the confluence of the Diversion with Coal Creek
was observed.
Runoff peaked by late May, with no damage noted. The Dutch Creek Diversion
continued to scour at its upper end until the gradient of the upper one hundred feet or so
of the Diversion matched that of the original channel immediately above the Diversion.
The scoured material was deposited just below the first bend in the channel. This
deposition caused the inner channel to become braided between the first and second
bends, nearly causing the inner channel to overtop onto the margins of the outer channel.
It appeared, but it was not measured, that the receding waters caused the braiding to
slightly incise, maintaining the integrity of the inner channel.
Some thought was given to excavating the braided portion of the channel in the fall of
1999. Discussions with the designer indicated that the Diversion may clean itself of
excess materials as sufficient flow events occur. Therefore, no maintenance steps were
taken. However, the Diversion will be closely monitored. This monitoring will be
facilitated as permanent cross section survey points were established in July, 1999.
These points will be revisited and the Diversion cross section measured on a periodic
basis in order to record the dynamics of the system.
During the late spring and early summer, negotiations were completed which settled the
lawsuit filed in 1997 by Mid-Continent Resources. The settlement required Mid-
Continent to provide the reclamation funding which they had been withholding from the
Division. This was done by late June, 1999. The agreement also required the Division to
overlap the sediment ponds at the site with a Stormwater permit. All ponds, excepting
those which handle mine water discharges (016, specifically) are covered by our permit.
This permit was applied for in August, and was approved by Water Quality Control in
October. The permit specifically applies to reclamation construction activities, and is not
construed to be a point source discharge permit. Our Stormwater permit will allow Water
Quality Control Division to terminate the NPDES permit held by Mid-Continent for these
ponds. Having the NPDES permit eliminated from the ponds where we will perform
reclamation in 2000 eases our concerns of having any point source liability. Two ponds
were affected by our construction work in 1999; the 001 and 009 ponds.
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