REP42616

• Permit No: C1981008
• IBM Index Class Name: Report
• Doc Date: 12/11/2001
• Doc Name: NUCLA NPDES PERMINT CO-0000213
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

COLORADO DEPARTMENT OF HEALTH, Water Quality Control Division
• Rationale - Page 2. Permit No. CO-0000213.
III. RECEIVING STREAM:
A. Identification, Classification and Standards
1. Identification: Discharge is to Tuttle Draw, which is tributary to
the San Miguel River, segment 5 of the San Miguel River Basin.
2. Classification: This stream segment is classified for the
following uses: Recreation, Class 2; Aquatic Life, Class 1 (Warm).
3. Numeric Standards: The standards which have been assigned in
accordance with the above classifications can be found in 3.5.0,
Classifications and Numeric Standards for the Gunnison and Lower
Dolores River Basin (5 CCR 1002-8).
B. Receiving Water Data
1. Stream Low Flow: The flows which can be used to calculate effluent
limitations are acute flows, those that occur for one day every
three years (lE3), or chronic, those that occur far thirty days
every three years (30E3). These flows have been determined by the
Water Quality Control Division and are as follows:
~ ~
For the San Miguel River above Tuttle Draw:
Acute (1-day, 3year flow) 2.5 cfs
Chronic (30-day, 3-year flow) 8.5 cfs
For Tuttle Draw:
Acute C1-day, 3-year flow) = zero
Chronic C30-day, 3year flow) zero
IV. FACILITY DESCRIPTION
A. Purpose of Amendment
By letter of October 16, 1989, the permittee has requested an
amendment to their permit. The amendment is to change the status of
discharge point 006 from active wining to post mining. The active
mining area located in the watershed above the 006 pond has been
backfilled and regraded. There will be ^o active mining-related
discharge from 006; any discharge shall consist solely of runoff.
Therefore, the permit limits snd monitoring requirements for 006 shall
be changed to [hose applicable to post~ining, as are currently
applied to discharge points 002, 003, 004 and 005.