Authority: IC 13-14-8; IC 13-15-1-2; IC 13-15-2; IC 13-18-3;
Affected: IC 13-12-3-1; IC 13-18-1
Monitoring requirements shall be as follows:
Each discharge outfall identified in
section 5(4) of this rule, or representative discharge outfall identified in
section 5(5) of this rule, composed entirely of storm water and allowable
nonstorm water run-off, shall be monitored as follows:
|| Sample Type
| Oil and grease
| CBOD5 (Carbonaceous biochemical
| COD (Chemical oxygen demand)
| TSS (Total suspended solids)
| TKN (Total Kjeldahl nitrogen)
| Total phosphorous
| Nitrate plus nitrite nitrogen
Each discharge outfall subject to subdivision (1) shall be monitored for any
pollutant attributable to a facility's industrial activity that is reasonably
expected to be present in the discharge, as well as for any other pollutant
that has the potential to be present in a storm water discharge as requested by
(3) Within one
(1) year of the original or renewal NOI letter submittal and prior to
implementation of the SWP3, a permittee regulated under this rule shall sample
and analyze the discharge from the outfall identified in the approved NOI
letter. The monitoring data taken from this first year event shall be used by
the permittee as an aid in developing and implementing the SWP3. Subsequent
annual sampling data shall be used to verify the effectiveness of the SWP3 and
will aid the permittee with revising the SWP3 and implementation of additional
BMPs, as necessary.
commissioner may require a permittee to sample additional storm events beyond
the required five (5) annual events upon finding reasonable cause. The
commissioner shall notify the facility in writing that additional sampling is
(5) A grab sample must be
collected during the first thirty (30) minutes of discharge at the storm water
outfalls identified in the NOI letter or as soon thereafter as
(6) The pH measurement
must be taken at the time the grab sample is collected and by using a pH meter
that has been properly calibrated according to manufacturer's specifications
and provides results displayed in numeric units. A color comparison analysis
for pH is not acceptable.
shall be a minimum of three (3) months between reported sampling
(8) Samples must be taken
at a point representative of the discharge but prior to entry into surface
waters of the state or a municipal separate storm sewer conveyance unless an
alternative location has been granted by the commissioner. For discharges that
flow through on-site detention basins, samples shall be taken at a point
representative of the discharge from the basin.
(9) All samples must be collected from a
discharge resulting from a measurable storm event at least seventy-two (72)
hours from the previous measurable storm event. Documentation of weather
conditions that prevent sampling as described in this subsection must be
provided to the commissioner.
(11) Run-off events
resulting from snow or ice melt should not be sampled and shall not be used to
meet the minimum annual monitoring requirements.
Reporting requirements shall be as
(1) All samples must be reported as a
value of concentration or loading.
For each measurement or sample taken
under this rule, the permittee shall record and submit the following
information to the commissioner:
exact place, date, and time of the start of the discharge, the duration of the
storm event sampled, a measurement of the rainfall in inches, and time of
(B) The duration between
the storm event sampled and the end of the previous measurable storm
(C) The individual who
performed the sampling or measurements.
(D) The dates the analyses were
(E) The individual who
performed the analyses.
analytical techniques or methods used.
(G) The results of all required analyses and
(H) A complete copy
of the laboratory report, including chain-of-custody.
(3) All records and information resulting
from the monitoring activities required under this rule, including all records
of analyses performed and calibration and maintenance of instrumentation, must
be retained for a minimum of either one (1) year following the date on an NOT
letter, three (3) years following the expiration of the facility's permit, or
longer if requested by the commissioner. As applicable, the records for
calibration and maintenance of instrumentation can be maintained at an off-site
laboratory but must be available to the commissioner upon request. All
calibration and maintenance records for on-site instruments, such as pH meters,
used by a facility for compliance with this rule must be documented and either
contained in, or have the on-site record keeping location referenced in, the
(4) A permittee regulated
under this rule shall submit sampling data results to the commissioner at the
address specified in section 8.5 of this rule within thirty (30) days after
laboratory analyses have been completed.
(5) A permittee regulated under this rule
that has a discharge that enters a regulated municipal separate storm sewer
conveyance shall also submit a copy of the sampling data results to the
operator of the regulated municipal system conveyance upon request.
(6) If a permittee regulated under this rule
monitors a pollutant more frequently than required under this rule, using
analytical methods referenced in subsection (a)(10), the results of such
monitoring must be reported as additional information in the annual report.
Such increased frequency must also be indicated in the