HYDRO25963

• Permit No: M1980244
• IBM Index Class Name: Hydrology
• Doc Date: 3/12/1992
• Doc Name: AUTHORIZATION TO DISCHARGE UNDER THE COLO DISCHARGE PERMIT SYSTEM
• Media Type: D
• Archive: No

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Part I
Page lg of 19
Permit No. CO-0042562
B. MONITORING REQUIREMENTS
7. Phase I THE (continued)
If the Phase I THE identifies a probable toxicant and/or a probable
source of toxicity, the permittee shall submit written notification to
that effect to the Division as part of the report. Within 30 days of
submission (date of receipt) of the Phase I TRE, the permittee shall
submit (date of receipt) for the Division's approval a control grogram
to control WET, and shall proceed to implement such plan within 7 days
following receipt of written approval from the Division.
If the Phase I THE fails to identify a probable toxicant and/or a
probable source of toxicity, the permittee shall notify the Division of
its findings and proceed with the Phase II TRE.
If toxicity disappears during the Phase I 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.
8. Phase II THE
A plan for a Phase II THE 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 THE Report. The Phase II TRE, as submitted to
or revised by the Division, shall be incorporated into the permit as a
modified compliance schedule.
The Phase II THE plan shall include the scope, methods, procedures,
reporting requirements, and schedules. A Phase II THE 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 identlfication studies
performed by the permittee shall be in general accordance with accepted
methods for Toxicity Identification Procedures and Toxicity Confirmation
Procedures. The Phase II THE permit conditions may be amended, if so
requested and justified by the permittee.
The Phase II THE report shall indicate the results of the Phase II THE
study. If the Phase II THE results in the identification of the
toxicants, the sources of toxicants or treatment for elimination of the
toxicant, the permittee shall submit for Divisioa approval a control
program to control WET within 60 days of submission (date of receipt) of
the Phase II THE Report, and shall proceed to implement such plan within
7 days following receipt of written approval from the Division.