HYDRO27746

• Permit No: M1977410
• IBM Index Class Name: Hydrology
• Doc Name: REFERENCES
• Media Type: D
• Archive: No

COLORADO DEPARTMENT OF~ALTH, Water Quality Control Die ion
Permit Number CO-0032751 Page 3 .
APPENDIX B1
Cros• Mine Discharge Nonitorinq Aeport Data: Discharge Point 001
Avq/Max Avg Avq Avg Avq Avq Avq Min/Hex
Month Flow TSS Cd Cu Pb Hq Zn pH
onm:(MGD) ~/1 me/1 me/1 me/1 ~} ~. e.u.

4/90 37 (.053/.072) 11 0.0025 0.006 0.054 80.0002 0.20 7.41/7.75
5/90 82;(0.118) 6 0.0030 0.004 0.021 0.0003 0.22 6.95/7.73
6/90 80;(0.115) XS 0.006 80.03 f A0.005 80.0002 0.3 6.95/7.65
7/90 No Sample Taken (No Dis charge following 7-2-90) 7.25/7.25
8/90 No Discharge
9/90 33;(0.076) RS 0.005 0.006 0.01 80.0002 0.4 7.3 /7.86
10/90 32;(0.045) RS 0.002 80.005 80.005 80.0002 0.1 7.3 /7.86
11/90 (0.039) RS 0.0021 80.005 80.005 80.0002 0.15 7.25/8.2
1/91 (0.028) RS 0.0037 80.005 0.008 80.0002 0.22 7.4 /8.38
2/91 (0.027) RS 0.0069 0.005 80.005 80.0002 0.22 7.35/8.12
Previous Permit Limits: 30-day average on top row; daily maximum on bottom row
NA 20 0.0004 0.005 0.004 0.00005 0.05 6.5 /9.0
NA 30 0.0008 0.010 0.008 0.00010 0.10 6.5 /9.0
R = Les^ than Avg = Average Hex = Maximum NA = Not applicable
• = During January 1990, the discharge flow indicated occurred for only 3
days; for the other days in January, no discharge occurred. During February
1990, a flow of 152 qpm occurred for 19 days, and 22 qpm occurred for 7 days.
/ Excluded from mean calculation determination
Nost of the reported oil and grease concentrations were usually ae "none" (not
visible) or 'ND" (less than 1 mq/1) for both average and maximum values during
the above period.
Mean value far 1/87 through 7/90 (when discharging):
42.7 2.75 0.0050 0.011 0.022 0.000094 0.36 6.3/ 8.9
Flow TSS Cd Cu Pb Hq Zn pH, .range
Mean value for 1/87 through 12/87 (when discharging prior to new tr~aatment
system being installed):
18.3 3.25 0.0051 0.013 0.018 0.00002 0.42 6.8/ 8.9
(range)
Mean value for 1/88 through 7/90 (when discharging after new treatm~ant system
was installed):
48.5 2.6 0.0050 0.011 0.024 0.00012 0.34 6.8/ 8.9
(range)
Most of the average repotted values (for metals and TSS) in Appendi:c B1 were
also the daily maximum reported value, except for certain months (2•-88, 5-88,
and 6-88) when two samples were reported for cadmium (0.0049, 0.0040; 0.0094,
0.0040; 0.005, 0.009 mq/1), lead (0.039, 0.020; 0.012, 0.04 mq/1), :and zinc
(0.32, 0.40; 0.53, 0.34; 0.31, 0.30 mq/1). The earlier reported va:LUes for
the metals may have been for either as total or total recoverable, I~ut later
reports were ae total recoverable for Cd, Cu, Pb, and Zn.