HYDRO28372

• Permit No: C1980007
• IBM Index Class Name: Hydrology
• Doc Date: 4/19/2004
• Doc Name: Exhibit 7 NPDES Permit
• From: Colorado Health Department of Public Health & Environment
• To: Mountain Coal Company
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PARTI
Page No. 7
Permit No.: CO-0038776
5. Acute WET Testing - Outfalls 004, 011, 012, 013. 016, and 017 (continued)
An permittee that is requved to conduct a PTI/TIE investigation shall do so in conformance with procedures identified in the
following documents, or as subsequently updated: 1) Methods for A uatic Toxici Identification Evaluations Phase I Toxici
Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 2) Metho or Aquatic Toxicity I entification Eva uahons, P ase
I Toxicity Identification Procedures, EPA/600/3-88/035 Feb. 1989.
Within 90 days of the determination of the toxicant or no later than 210 days afrer demonstration of toxicity, whichever is
sooner, a control program is to be developed and received by the Division. The program shall set down a method and procedure .
for elimination of the toxicity to acceptable levels.
e. Reouest For Relief
The permittee may request relief from further investigation and testing where the toxicant has not been determined and the
Diviston has detemilned sortable treatment does not appeaz possible. In requesting such relief, the pernrittee shall submit
material sufficient to establish the following:
i. It has complied with temis and conditions of the pemri[.compliance schedule for the PTUTIE investigation and other
appropriate conditions as may have been required by the Division;
ii. Duringg the period of the toxicity incident it has been incompliance with all other permit conditions, including, in the case of
a POTW, pretreatment requirements;
iii: During the period of the toxicity incident it has properly maintained and operated all facilities and systems of treatment and
control; and
iv. ~ Despite the circumstances described in paragraphs i. and iii. above, the source and/or cause of toxicity could not be located
or resolved.
If deemed appropriate by the Division, the pemrit or the compliance schedule maybe modified to revise the ongoing monitoring
and toxicity mveshgatron requirements to avoid an un roductive expenditure of the petmittee's resources, provided that the
underlying obligation to elmvnate any continuing exceedpance of the toxicity limit shall remain.
f. Spontaneous Disappearance
If toxicity spontaneously disapppeazs at any time afrer a test failure, the pertnittee shall notify the Division in writing within 14
days of a demonstration of disappeazance of the toxicity. The Division ma re uire the permittee to develop and submit
additional mformafion, which may include, but is not limited to, the results of additional testing. If no pattern of toxtcrry rs
identified or recurring toxicity rs not rdenhf-ied, the toxicity incident response is considered closed and normal WET testing shall
resume.
g. Toxicity Reopener
This permit may be reopened and modified (following proper administrative procedures) to include new compliance dates,
additional or modified numerical permit limitations, a new or different compliance schedule, a change in the whole effluent
toxicity testing protocol, or any other conditions related to the control of toxicants if one or more of the following events occur:
i. Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation.
ii. The PTUTIE results indicate that [he toxicant(s) represent pollutant(s) that maybe controlled with specific numerical liailts,
and the Division agrees that the numerical controls aze the most appropriate course of action.
iii. The PTI/TIE reveals other unique conditions or chazacteristics which, in the opinion of the Division, justify the
incorporation of unanticipated special conditions in the permit.
B. MONITORING REQUIREMENTS
1. Freouency and Sample Type
In order to obtain an indication of [he probable compliance or noncompliance with the effluent limitations specified in Part LA.1, the
permittee shall monitor all effluent parameters at the following frequencies. Such monitoring will begin immediately and last for the
life of the ppermit unless otherwise noted. The results of such monitoring shall be reported on the Drschazge Monitonng Report form
(See Part LE.).
a. Outfalls 004 and 016
~ ~4 ~ -
~' , cent Parameter-;~..,,~ ~ ~ <r;... _ ._
`,. *~';`'~' a `'Fie, en .+..: ,, ..~ yin
'""~"~.~? r.:, 5~ •• lead e~-' '~.
low, MGD Once er week Instantaneous or Continuous
oral Sus ended Solids TSS , m 1 Once er month ~ Grab
oral Iron, u 1 Once er month Grab
ettleable Solids, m]/1 Once er month Grab
oral Residual Chlorine, m /1 Outfall 004 Onl Once er week Grab
H, s.u. minimum-maximum Once er week In-situ
Revised 4q 9/2004