PERMFILE106134

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: NPDES PERMIT
• Section_Exhibit Name: TAB 15 APPENDIX 15-4 PART 2
• Media Type: D
• Archive: Yes

• PART I
Page lj of 19
Permit No. CO-0000221
B. MONITORING REQUIREMENTS
6. Phase II TRE
A plan for a Phase II TRE shall be submitted (date of receipt) to the Division by
the permittee within 60 days of the submission (date of receipt) of the Phase I
TRE Report. The Phase II TRE, as submitted to or revised by the Divie ion, shall
be incorporated into the permit as a modified compliance schedule.
The Phase II TRE plan shall include the scope, methods, procedures, reporting
requirements, and schedules. A Phase II TRE may follow either of two directions,
as appropriate: toxicant treatability studies, or toxicant/source identification
and control studies. Toxicant treatability studies are designed to assess the
feasibility of eliminating WET via addition or modification of treatment processes
at the wastewater treatment facility.
~~ Toxicant/source identification and control efforts are designed to identify
toxicants, identify the sources of toxicants, and control whole effluent toxicity
. by eliminating the introduction of toxicants into the wastewater treatment
facility. Toxicity identification studies performed by the permittee shall be in
general accordance with accepted methods for Toxicity Identification Procedures
• and Toxicity Confirmation Procedures. The Fhase II TRE permit conditions may be
amended, if so requested and justified by the permittee.
The Phase II TRE report shall indicate the results of the Phase II TAE study. If
the Phase II TRE results in the identification of the toxicants, the sources of
toxicants or treatment for elimination of the toxicant, the permittee shall submit
for Division aoproval a control program to control wET within 60 days of
subrtiission (date of receipt) of~the Phase II TRE Report, and shall proceed to
implement such plan within 7 days following receipt of written approval from the
Division.
If toxicity disappears during the Phase II TRE, the permittee shall submit written
notification to that effect to the Division. The Division may require the~~
permittee to conduct accelerated testing to demonstrate the continued absence of
toxicity. If, after completing any Division directed accelerated testing, no
acute toxicity is found to exist, the permittee shall resume normal quarterly
testing.
9. Control Program
If required pursuant to Part I.B, of this permit, the permittee shall develop a
control program to eliminate WET, thcough the identification and elimination of
any toxicants or toxicant sources responsible for WET, or through the
identification and implementation of toxicant treatability processes. The control
program, along with any cost/benefit analysis to determine whether the costs of
construction bear a reasonable relationship to the resulting benefits, shall be
submitted within the specified time frames. Such cost benefit analysis shall be
used in accordance with Section 25-8-503(8) and (9), C.R.S. The control program,
as submitted to oc revised by the Division, may be incorporated into the permit.