HYDRO23029

• Permit No: C1981041
• IBM Index Class Name: Hydrology
• Doc Date: 5/9/1994
• Doc Name: RATIONALE FOR PUBLIC NOTICE PN CO-0027146
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PART I
Page if of 19
Permit No. CO-0027146
B. MONITORING REQUIREMENTS
3.. Reporting of Data (continued)
The first on ig pal copy of each discharge monitoring report (DMR) shall be submitted
to the Division at the following address:
Colorado Department of Health
WQCD-PE-B2
4300 Cherry Creek Drive South
Denver, Colorado 80222
The first duplicate signed copy of each report form shall be submitted to the following
agency:
U.S. Environmental Protection Agency
Water Management Division
NPDES Branch 8WM-C
999 18th Street, Suite 500
Denver, CO 80202-2466
4. Acute WET Testine - Outfalls 001. 002. 004 and 015
(a) Testing and Reporting Repulrements
Tests shall be done at the frequency listed in Part I.B.l. Test results shall
be reported along with the Discharge Monitoring Report (DMR) submitted for the
reporting period during which the sample was taken. (i.e., WET testing results
for the first calendar quarter ending March 31 shall be reported with the DMR due
April 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 along with the DMR.
The permittee shall conduct each acute WET test in general accordance with
methods described in Methods for MeasurinE the Acute Toxicity of Effluents and
Receiving Waters to Freshwater and Marine Organisms, EPA/600/4-90/027 or the most
current edition, except as modified by the most current Division guidance
document entitled Guidelines for Conducting Whole Effluent Toxicity Tests. The
permittee shall conduct an acute 48-hour WET test using Ceriodaphnia sp., and an
acute 96-hour WET test using fathead minnows. Acute tests will be replacement
static tests of a single effluent grab sample.
(b) Failure of Test and Division Notification
An acute WET test is failed whenever the LCSO, which represents an estimate of
the effluent concentration which is lethal to SOX of the test organisms in the
time period prescribed by the test, is found to be less than or equal to 100X
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 Incident ("PTI")/Toxicity Identification Evaluation ("TIE")
investigation or accelerated testing is being performed (see next section).
Amendment No. 1 Issued Effective