PERMFILE44465

• Permit No: M1980244
• IBM Index Class Name: Permit File
• Doc Date: 8/15/2002
• Doc Name: Draft NPDES Permit
• From: CDPHE
• To: DMG
• Media Type: D
• Archive: No

Table 11:
Summary of the Calculated Assimilative Capacities
Assimilative Ca aci effective Janua 20 2003 in Parentheses
Pazameter Chronic Assimilative Acute Assimilative Chronic Acute Assimilative
Capacity Capacity Assimilative Capacity in Arequa
in Cripple Creek Cripple Creek Capacity in Gulch(ugq)
(ugA) (ugA) Arequa Gulch
(u )
i, Dis (ugtl) 156 1302 168.04 1512.89
Zn, Dis (ug/1) (---) I (---)1 800 (600) 3,500
Note 1: For [he pollutants of concern where there is no available assimilative capacity, the discharge must be limited to the standard.
Cu(chp] 4.9 ug/l, Mn(chp2013 ugll, Mn(acN3CvW, Zn(chr] 94.6 ug/1, and Zn(acr196.2 up,A.
V. Antidegradation Review
As set out in The Basic Standards mtd Methodologies of Surface Water, Section 31.8(2)(6), an antidegradation
analysis is required except in cases where the receiving water is designated as "Use Protected." Note that "Use
Protected" waters are waters "that the Commission has determined do not warrant the special protection provided
by the outstanding waters designation or the antidegradationreuiew process" as set out in Section 31.8(2)(6). The
antidegradation section of the regulation became effective in December 2000, and therefore antidegradation
considerations aze applicable to this WQA development.
According to the Classifcatiau and Numeric Standards forArkansas River Basin, stream segments COARUA21
and COARUA22a aze Use Protected. Because the receiving waters aze designated as Use Protected, no
antidegradation review is necessary in accordance with the regulations. Thus, for purposes of this WQA,
antidegradation review requirements have been met for the Cripple Creek and Victor Gold, Arequa Gulch
dischazge permit's issuance process.
VI. References
Colorado Total Maximum Daily Load and Wasteload Allocation Guidance, CDPHE, WQCD, November 1991.
Classifications and Numeric Standards for Arkansas River Basin, Regulation No. 32, CDPHE, WQCC, Effective
April 24, 2002.
The Basic Standards and Methodologies for Surface Water, Regulation 31, CDPHE, Effective October 30, 2001.
Appendix A Page 13 of 13