2017-05-11_PERMIT FILE - C1981012 ‎(18)‎

• Permit No: C1981012
• IBM Index Class Name: Permit File
• Doc Date: 5/11/2017
• Section_Exhibit Name: Exhibit 22 NPDES Permit
• Media Type: D
• Archive: No

In TRIM
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division
Fact Sheet- Page 17, Permit No. C00000906
Table VII -3 - Quantitative Reasonable Potential Analysis 001
Parameter
MEPC
30 -Day Average
WQBEL
(MAPC)
Permit
Limit
MEPC
Daily Max
WQBEL
(MAPC)
Permit
Limit
Antideg (2 Year Roll. Ave)
ADBAC Permit
MEPC (MAPC) Limit
As, TR (pg/1)
Beginning
01/01/2022
2.2
3-----------------
76
1.3
26
29
19
23
92
6.8
0.032
!
152
18
5.5
2894
0.016
7.2
+---- ------,
256
6.3
2.1
Yes
No
Yes
No
No
Yes
Yes
No
Yes
Yes
5.4
3
67.5
1_ .2
50
18
-- - ---
80
! 530 ; No
78 No
-
28 Yes
144 No
5251 No
29 Yes
- , --- - -- -
353 No
0.75 0.0048
0.5 1 81
0.27 12
0.27 - 22
- -- - -
7.5 2.3
0.2 0.91
_1.3 456
1.5 0.0024
4.5 ' 1.2
---------� -
5.5 51
20 0.9.8
Yes
No
No
No
Yes
No
No
Yes
Yes
- -
No
Yes
As, Dis (pg/l)'
Cr+3, TR (pg/l)Z
Cr+3, Dis (pg/l)Z
Cu, Dis (pg/1)
Pb, Dis (pg/ l)
Mn, Dis (pg/l)
Hg, Tot (pg/1)
Se, Dis (pg/l)
Zn, Dis (pg/l)
B, Tot (mg/1)
EC (dS/m)
'Dissolved arsenic data were not available; total arsenic data were used as a conservative estimate for dissolved arsenic, as total arsenic
concentrations include the dissolved form.
1 Trivalent chromium data were not available; total chromium was used as a conservative estimate, as total chromium concentrations include
trivalent chromium concentrations.
B. Parameter Evaluation
The following parameter evaluation applies to all outfalls covered by the renewal permit (i.e., both non-
stormwater and stormwater outfalls) that are subject to numeric effluent limitations. Those outfalls subject to the
federal ELG Subpart H (Outfalls 004, 011, and 012), are not included herein.
1. Technology Based Limitations
Total Suspended Solids (TSS) - The federal ELG (Subpart D and/or Subpart B) limitation for TSS is applied to
discharges from outfalls 001, 007, 008, and 010. According to Part 62.2(3) of the Regulations for Effluent
Limitations "If the Commission has not so promulgated effluent limitation guidelines for any particular industry,
but that industry is subject to effluent limitation guidelines promulgated by the United States Environmental
Protection Agency pursuant to the Federal Water Pollution Control Act of 1972, the effluent from these
industries shall be subject to the applicable EPA guidelines and shall not be subject to the effluent limitations
of Regulation 62.4." These limitations are the same as those contained in the previous permit for outfalls 001,
007 and 008, and are imposed upon the effective date of the permit. This is a new limit for outfall 010, but a
compliance schedule is not applicable to federal EI -Gs and therefore, the limit is effective immediately.
Total Iron - The federal ELG limitations for total iron are applied to discharges from outfalls 001, 007, 008 and
010. In cases where the WQBEL is the more stringent limit, the WQBEL will be applied in lieu of the 30 -day
average ELG. See discussion in the Water Quality Standards section for total iron below. This is a new limit for
outfall 010, but a compliance schedule is not applicable to federal El -Gs and therefore, the limit is effective
immediately.
Oil and Grease - The oil and grease limitations from the Regulations for Effluent Limitations (Regulation 62)
are applied to discharges from outfall 001.
2. Water Quality Standards
Where the division made a qualitative monitoring determination for outfalls 007, 008, and 010 for a specific
parameter, the associated monitoring frequencies were based on whether limits, or monitoring, were applied
to outfall 001. Where limits were applied to outfall 001, quarterly monitoring was required for outfalls 007,