DISCHARGES. The permittee shall evaluate all outfalls for non-storm water
discharges into the storm drainage system beginning in the first year of permit
coverage. Evaluations shall take place during dry periods. The following are
additional requirements for evaluating non-storm water discharges:
(a) Any monitoring shall be representative of
non-storm water discharges from the facility.
One of the following monitoring
procedures shall be followed:
1. End of pipe
screening shall consist of visual observations made at least twice per year at
each outfall of the storm sewer collection system. Observations shall be made
at times when non-storm water discharges from the facility are considered most
likely to occur. Instances of dry weather flow, stains, sludges, color, odor or
other indications of a non-storm water discharge shall be recorded;
2. A detailed testing of the
storm sewer collection system may be performed. Testing methods include dye
testing, smoke testing or video camera observation. Should the permittee use
detailed testing as an alternative, the department shall require a re-test
after 5 years or a lesser period as deemed necessary by the
permitted facilities shall maintain the results of their non-storm water
evaluations on site. Facilities shall report the results of the initial
non-storm water evaluations to the department within the SWPPP summary form
required pursuant to s.
. Information reported shall include date
of testing, test method, outfall location, testing results and potential
significant sources of non-storm water discovered through testing.
Note: The department storm water pollution
prevention summary Form 3400-167 contains a table for recording the results of
the non-storm water discharge evaluations.
(d) Any permittee unable to evaluate outfalls
for non-storm water discharges shall sign a statement certifying that this
requirement could not be complied with, and include a copy of the statement in
the SWPPP. The statement shall be submitted to the department.
(e) If a permittee identifies an unauthorized
discharge of pollutants, the permittee shall immediately cease the discharge
and contact the department to determine if a permit is required under s.
(2) ANNUAL SITE
INSPECTIONS. Permittees under this subchapter shall perform and document the
results of an annual facility site compliance inspection. The inspection shall
be adequate to verify that the site drainage conditions and potential pollution
sources identified in the SWPPP remain accurate, and that the best management
practices prescribed in the SWPPP are being implemented, properly operated and
adequately maintained. Information reported shall include the inspection date,
inspection personnel, scope of the inspection, major observations and revisions
needed in the SWPPP.
VISUAL INSPECTION. Permittees under this subchapter shall perform and document
quarterly visual inspections of storm water discharge quality at each outfall.
Inspections shall be conducted within the first 30 minutes or as soon
thereafter as practical, but not to exceed 60 minutes, after runoff begins
discharging at the outfall. The inspections shall include any observations of
color, odor, turbidity, floating solids, foam, oil sheen or other obvious
indicators of storm water pollution. Information documented shall include: the
inspection date, inspection personnel, visual quality of the storm water
discharge and probable sources of any observed storm water
SAMPLING AND ANALYSIS. Unless an alternative monitoring plan is required as
part of the SWPPP, owners or operators of facilities covered under a tier 1
general permit issued under this subchapter or an individual WPDES permit
issued under s.
Stats., containing tier 1 general permit requirements, or individual storm
water discharge permits issued under s.
283.33(1) (a) and
, Stats., shall perform annual chemical
storm water sampling at each outfall for those residual pollutants listed in
the permittee's SWPPP as required by s.
. The following are specific requirements
for chemical storm water monitoring:
list of pollutants to be tested in the discharge at the outfall shall be
identified in the facility monitoring plan portion of the SWPPP.
(b) When a facility has more than one outfall
which have storm water discharges substantially similar based on consideration
of industrial activity, significant materials and management, one outfall may
be selected to represent the group of similar outfalls provided that this
strategy has been clearly stated in the facility monitoring plan and that the
representative outfall is clearly identified as such on the drainage base map.
No more than 5 outfalls with discharges representative of storm water
discharged from the facility need to be sampled.
(c) After review of the facility monitoring
plan portion of the SWPPP, the department shall add additional pollutants to
the monitoring list if it has cause to do so based on a reasonable probability
that the pollutants will be present in storm water discharges from the
facility. The department shall remove pollutants from the monitoring list if it
determines that continued monitoring for the pollutant serves no further
purpose. Chemical monitoring may be discontinued after submitting the second
round of chemical monitoring results to the department with the annual facility
site compliance inspection report unless the department directs the permittee
otherwise. The department shall require additional chemical sampling within a
tier 1 general permit for industrial facilities where chemical monitoring has
shown a reasonable potential that the storm water discharge from an individual
facility or a type of industry will exceed a water quality standard.
(d) Storm water samples shall be collected
during the period of March through November from rainfall events that produce
greater than 0.1 inch of rainfall and occur at least 72 hours after a previous
rainfall of 0.1 inch or greater.
Storm water samples shall be
representative of the "first flush" of storm water runoff at the outfall using
one of the following sampling methods:
Composite sample shall be collected during the first 30 minutes of runoff. At
least 3 separate samples shall be collected for compositing, and the collection
of samples shall be evenly spaced throughout the sampling period. Composite
samples are required for all pollutants except those for which analytic
techniques require grab samples.
A grab sample is required for all pollutants in storm water discharged from a
detention pond or other structure that has greater than a 24-hour holding time
for a representative storm. The grab sample shall be representative of the
storm water discharge at the pond outfall.
3. An alternative sampling collection time
specified by the department if the department determines it is necessary to
obtain a representation sample of storm water runoff from the site.
(f) Monitoring samples shall be
representative of the monitored discharge. Analytic testing shall be in
conformance with ch. NR 219, unless an alternate procedure is approved by the
department prior to the initiation of sampling.
For each storm water measurement or
sample taken, the permittee shall record and submit the following information
to the department in the annual facility site compliance inspection reports
described in s.
1. The date, exact place, method and time of
sampling or measurements.
individual who performed the sampling or measurements.
3. The date the analysis was
4. The name of the
certified laboratory which performed the analysis.
5. The analytical techniques or methods
6. The results of the
7. The estimated duration
of the rainfall event, in hours, and the estimated total amount of
precipitation falling during the rainfall event, in inches.
EXCEPTIONS. The department may waive specific monitoring requirements if one of
the following applies:
(a) An employee could
not reasonably be present at the facility at the time of the snowmelt or runoff
event, or those attempts to meet the monitoring requirement would endanger
employee safety or well being.
There were no snow melt or runoff events large enough to conduct a quarterly
visual inspection at an outfall.
(c) The facility is inactive or remote, such
as inactive mining operations where monitoring and inspection activities are
impractical or unnecessary. At a minimum, the department shall establish an
alternative requirement that the facilities make site inspections by a
qualified individual at least once in every 3-year period.
(d) The permittee can demonstrate to the
department's satisfaction that the sources of storm water contamination are
outside of the facility's property boundary and are not associated with the
facility's activities. The demonstration shall be presented in the SWPPP and
submitted to the department for evaluation.