2013-03-04_REPORT - C1980004

• Permit No: C1980004
• IBM Index Class Name: REPORT
• Doc Date: 3/4/2013
• Doc Name: 2012 Annual Hydrology Report
• From: J.E. Stover & Associates, Inc
• To: DRMS
• Annual Report Year: 2012
• Permit Index Doc Type: Hydrology Report
• Email Name: MPB
• Email Name: SB1
• Media Type: D
• Archive: No

PHC East Salt Creek Fourth Quarter 2012
Total Dissolved Solids
Flow gpm
Flow cfs
TDS
SW -1 East Salt Creek
1,481
3.3
1,817
Mine Discharge
82.5
0.18
2,430
Combined Flow
1,563
3.48
1,865
PHC East Salt Creek
Total Dissolved Solids
SW -1 Upstream
SW -8 Downstream
Change
4 Quarter 2012
1766
2088
+322
2012 AHR
McClane & Munger Canyon Mines
Page 5
the mine being idle, the sampling required for the first through fourth quarters in
2012 were based on an approved short list of parameters for temporary
cessation. The results from the samples collected from East Salt Creek above
and below the mine site are generally the same for all parameters.
The McClane Canyon Mine discharged to East Salt Creek during August and
September 2012. The August testing was the quarterly required WET test and
an accelerated test, since an accelerated test needed to be performed from the
failing WET test back in March of 2011. The water quality of the discharge met
discharge permit requirements, and both WET tests passed. No pattern of
toxicity was found since two consecutive WET tests passed.
Table 6 contains analyses of mine water discharged into East Salt Creek in the
fourth quarter (August). The mine water had a TDS value of 2,430 mg /I. The
TDS value for East Salt Creek at SW -1 was 1,817 mg /I during the fourth quarter
of 2012. The following tables show there was potentially only minor degradation
(0.3% increase in TDS) during the fourth quarter. The mine did not discharge
during the 4 quarter 2011 or the 2 or 3� quarters of 2012.
The quality of the water at the upstream (SW -1) monitoring point was better than
the downstream (SW -8) monitoring point during the fourth quarter of 2012 when
the mine discharge could have had a minor impact on the upstream quality. It is
difficult to predict what causes the TDS in East Salt Creek to increase or
decrease as the results are not consistent during the water year. Based on the
aforementioned results, it is unlikely the mine discharge had a negative impact
on the quality of East Salt Creek. Total dissolved solids (TDS) in the above
tables are laboratory values in mg /I.
Groundwater
Table 5 shows the results of groundwater sampling during the water year. Table
5a was created in 2011 for GW -10 to be used to gather a year of baseline data,