2002-05-13_PERMIT FILE - C1981018 ‎(2)‎

• Permit No: C1981018
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Doc Name: Please Refer to Illustration 46 for Water Discharge Permit
• Section_Exhibit Name: Illustration 13
• Media Type: D
• Archive: No

Part I
Page 13 of 19
Permit No. CO-0038024
B. MONITORING REQUIREMENTS
2. Frequency and Sample Tvpe - Acute WET Testing (004, 023 and 024)
The monitoring frequency for acute WET tests shall be quarterly,
commencing with the first full calendar quarter following the permit
effective date. Quarterly teat results shall be reported along with
the Discharge Monitoring Report (DMR) submitted for the end of the
reporting. calenaar quarter (i.e., WET testing results for the calendar
quarter ending March 31 shall be reported with the DMR due April 28,
with the remaining WET testing reports submitted with DMRs due each
July 28, October 28 and January 28). The results shall be submitted
on the Acute Toxicity Test report form, available from the Division.
Copies of these reports are to be submitted to both the Division and
EPA.
The permittee shall conduct each acute WET test in general accordance
with methods described in the Division guidance document entitled
Guidelines for Conducting Whale Effluent Ta;.icity Tests. The
permittee shall conduct an acute -hour WET test using Ceriodaphnia
sp., and an acute 96-hour WET teat using fathead minnows. Acute testa
will be re pia cement static tests of a single effluent grab sample.
3. Accelerated Testing
If an individual toxicity test shows tonicity at concentrations less
than or equal to the Instream Waste Concentration (IWC) of 100X or if
SOZ species mortality is any dilution is detected in any acute WET
test conducted in accordance with this permit, the permittee shall
notify the Division verbally within 24 hours and in writing within 5
days of becoming aware of the. tonicity. Within 7 nays of becoming
aware of the tonicity, the permittee shall then begin accelerated
testing of the discharge with whichever species has proven (through
the first instance of tonicity) to be the most sensitive. The
permittee will continue such testing with one species, once every week
until directed by the Division to do otherwise, but in no case for
more than five representative tests.
4. Preliminary Tonicity Investigation
If directed by the Division, the permittee shall perform a preliminary
tonicity investigation. The permittee will have 15 working daps from
the date of Division notification to complete a preliminary toxicity
investigation and submit the results to the Division, in writing. The
preliminary tonicity investigation may include, but is not limited
to: additional chemical and biological monitoring, examination of
pretreatment program records, examination of discharge monitoring
reports, evaluation of treatment processes and chemica'_ use,
inspection of material storage and transfer areas to determine if a
spill may have occurred, and similar procedures.
Revised 5/2/89 Amended
Doc 1003M rfc=~*;.e

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