PERMFILE115773

• Permit No: C1981018A
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Doc Name: Water Discharge Permit
• Section_Exhibit Name: Illustration 46
• Media Type: D
• Archive: Yes

PART I
Page viii
Permit No. CO-0038024
MONITORING REQUIREMENTS
2. R~fotting of Data (rnntinuedl
The first dunlirate signed copy of each discharge monitoring report (DMR) shall be submitted to the following agency:
U.S. Environmental Protection Agency
Water Management Division
NPDES Brooch SWM-C
999 18th Street, Suite 500
Denver, CO 80202-2466
The third sad fourth copies are far the permittee records. The Discharge Monitoring Repoli forms shall be filled out
accurately and completely in accordance with requiremeata of this permit and the imtructiom oa the forma. They shall
be signed by as authorised person as identified in Put I.D.
3. Acute WEI' Testing-Outfalls 004. 023. 024 and 026
(a) Testing and Reporting Reauiroments
Testa shall be done at the finqueacy listed in PaR I.B.1. Teat results shall be reported along with the Discharge
Monitoring Repoli (DMR) submitted for the reporting period during which rho sample was takes. t<.e., WET testing
rrsulta for the first calendar quarter ending March 31 shall be reported with the DMR due Apci128.) The results
shall be submitted on the Acute Toxicity Teet report form, available from the Division. Copies of these reports are
to be submitted to both the Division and EPA along with the DMR.
The permittx shall conduct each acute WET teat is genera! accordance with methods described is Methods for
• Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Oresniems, EPA/600/4-
90/027 or the most cunmt edition, except ae modified by the moat current Division guidance document entitled
Guidelines for Conducting Whole Effluent Toxicity Tests. The permittee shall conduct an acute 48-hour WBT test
using Daphnis Magm sp., and an acute 96-hour WET test using fathead minnows. Acute testa will 6e replacement
static testa of a single effluent grab sample.
(b) Failure of Test and Division Notification
M acute WEI test is failed whenever the LCp, which represents an ~:^~^« of the effluent conomtrstioa which is
lethal to 50% of the test org..~ in the time period prescribed by the test, is found to be less then or equal to
100% effluent. The permittee must provide written notification of the failure of a WET test to the Division, along
with a statement as to whether the Preliminary Toxicity Luideot ('PTI')/Toxicity Identification Evaluation ('TIE")
investigation or accelerated testing is being performed (see mxt section). Notification mtut be received by the
Division within 14 calendar days of the demonslratios of acute WET in the routine required test.
'Demonstratiaa• for the purposes of PaRa I.B.4tb),(c),(d) and (f) mean no later thaw the last day of the laboratory
test.
(c) Automatic Compliance Schedule Uoon Failuro of Test
If a routine acute WET test is failed, the following auWmatic compliance schedule shall apply. As part of this the
permittee shall either.
(i) Proceed to conduct the PTllITE investigation as described in PaR I.B.4.(d), or
(ii) conduct accelerated testing ming the single species found to be more sensitive.
• TF accelerated testing is being performed, the permittce shall provide written sotiTcatios of the rtsdfs within
14 calendar days oC completion of the "Patters of Toxiaty"/"No Toxidty" demomtratioa Testing will be at
lean once every two weeks for up to five tests until 1) two coasxutive tests fail or three of five tests fail, in which
case a pattern of toxicity has bees demoasuated or, 2) two consecutive testa pace or throe of five test pass, is
which case no pattero of toxicity has bees found.