1986-12-31_REPORT - C1981008 ‎(3)‎

• Permit No: C1981008
• IBM Index Class Name: Report
• Doc Date: 12/31/1986
• Doc Name: 1986 Annual Hydrology Report ‎(Part 1 of 8)‎
• Annual Report Year: 1986
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

embankment slopes. The principal spillway outlet has been a
sharp-crested 90' V-notch weir. The redesign of the principal
spillway will utilize a drop inlet spillway with a 6-inch barrel
diameter and a 12-inch riser diameter. In order to continue
monitoring flow continuously out of the pond as required by the
approved monitoring program (Appendix A) , an appropriately sized
H-flume with a continuous recorder will be installed immediately
below the principal spillway outlet as soon as possible, weather
permitting, after the pond reconstruction work has been completed,
which has been projected to be in the early spring of 1987.
4. Site SW-N2
Site SW-N2 is located below mining on the lower reach of the
West Return Ditch immediately above its confluence with Tuttle
Drawn as shown on Exhibit 1. This site was monitored for flow and
quality three times in 1980; the monitoring data are presented in
Appendix B. Monitoring at this site was abandoned in the fall of
1980 because upstream monitoring at NPDES 001 and downstream
monitoring at SW-N3 precluded the need for this site. Consequently
the data presented are extremely limited and no further discussion
is hereby provided.
5. Springs
As shown on Exhibit 1, three springs, the Highwall Spring and
Spoils Springs #1 and #2 are monitored at the Nucla Nine. As
earlier discussed, a semiannual spoils spring survey of reclaimed
areas has been implemented as of this September (1986) . In the
course of this survey, the PCC field hydrologist responsible for
the Nucla Mine discovered a second spoil spring proximate to Spoils
Spring #1. This spring, identified as Spoils Spring #2, will be
monitored according to the same program that Spoils Spring #1 is
monitored (see Section III. A. ) .
The Highwall Spring is located on the north face of the east
end of the mining pit which was left when PCC ceased mining in
the fall of 1983 as shown on Exhibit 1. Flow and quality data
have routinely been collected from this site since June of 1983;
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