HYDRO24194

• Permit No: M1980244
• IBM Index Class Name: Hydrology
• Doc Name: AMENDMENT 1 RATIONALE CRIPPLE CREEK & VICTOR GOLD MINING CO A JOINT VENTURE BETWEEN PIKES PEAK MININ
• Media Type: D
• Archive: No

COLORADO DEPARTMENT'OF~HEALTH, Water Quality Control ~ is•
Rationale - Page 9. Permit No. CO-0024562.
1. Water Quality Standard Based Effluent Limitations: Amass balance
equation was used to determine the effluent concentrations for
those parameters whose limitations are based on the water quality
standards (except in the case of pH, where the limits are set
directly from stream standards). The mass balance equation is:
M3Q3 - M1Q1
M2 =
Q2
Where: R1 = Upstream low flow from Part III.B.1
Q2 = Effluent flow from Part II.F
Q3 = Combined downstream flow (Q1 + Q2)
Ml = Upstream background pollutant concentration
M2 = Unknown; effluent pollutant concentration
Mg = Water Quality Standard
A summary of the mass balance calculations is shown and discussed
in Table VI.2.
The values for Ql, Q2 and Q3 are the same in all of the
calculations f or water quality limited parameter s and are:
No Mining Activity Mining Activity
Ql 6.8 cfs 4.39 MGD) Q1 6.8 cfs 4.39 MGD)
Q2 4.0 cfs (2.58 MGD) Q2 6.0 cfs (3.76 MGD)
Q3 :10.8 cfs (6.97 MGD) Q3 :12.8 cfs (8.15 MGD)
Values for M1 and M3 vary depending on the applicable water
quality standard (M3) and the background stream quality data
(Ml). The metals limitations listed in the following table,
except Mercury, are based on the equations found in 3.1.0, The
Basic Standards and Methodologies for Surface Water, Table III.
These equations are dependent on the hardness of the receiving
stream. The hardness assumed for the stream is 220. These water
quality standards are also shown in Table VI-2 along with the
calculated effluent limitations (M2) for a facility design flow
of 4 cfs. The upstream data was obtained from Fourmile Creek and
covers the period from April, 1990 to November, 1990. The actual
calculations are in the permit file and are available upon request.