Stormwater Pollution Prevention Plan - Phoenix Sky Harbor ...

Non-mining MSGP 2010 General Permit
snowmelt, samples shall be taken during a period with a measurable discharge from the
facility (see also Part 6.1.2.3); and
On discharges that occur at least 72 hours (3 calendar days) from a previous discharge (see
also Part 6.1.2.2).
The permittee shall visually inspect the sample for the following water quality characteristics:
Color;
Odor;
Clarity;
Floating solids;
Settled solids;
Suspended solids;
Foam;
Oil sheen; and
Other obvious indicators of stormwater pollution.
4.2.2 Visual Assessment Documentation
The permittee shall document the results of the visual assessments and maintain this
documentation with the SWPPP as required in Part 5.4. The visual assessment findings need not be
submitted to ADEQ, unless specifically requested by the Department. At a minimum, the documentation
of the visual assessment shall include:
Sample location(s);
Sample collection date and time, and visual assessment date and time for each sample;
Personnel collecting the sample and performing visual assessment, and their signatures;
Nature of the discharge (i.e., runoff or snowmelt);
Results of observations of the stormwater discharge;
Probable sources of any observed stormwater contamination; and
If applicable, why it was not possible to take samples within the first 30 minutes.
4.2.3 Exceptions to Visual Assessments
Absence of Discharge: If no storm event results in a discharge from the facility or outfall(s) during
a wet season, the permittee is excused from visual assessment for the facility or outfall(s) for that
season provided the permittee documents in the monitoring records and retains with the SWPPP
why a sample could not be collected.
Adverse Conditions: Adverse conditions are those that are dangerous or create inaccessibility for
personnel, such as local flooding, high winds, or electrical storms, or situations that otherwise
make sampling unsafe.
When adverse conditions prevent the collection of either visual assessment sample in a given wet
season, the permittee shall document those conditions with the SWPPP and resume visual
assessment monitoring in the subsequent wet season.
Inactive and unstaffed sites: The requirement for a routine visual assessment does not apply at a
facility that is inactive and unstaffed, provided that no industrial materials or activities are exposed
to stormwater. To invoke this exception, the permittee shall do the following:
Maintain a statement in the SWPPP as required in Part 5.1.5.2 indicating that the facility
is inactive and unstaffed, and that there are no industrial materials or activities exposed
to precipitation, in accordance with the substantive requirements in 40 CFR
122.26(g)(4)(iii). The statement must be signed and certified in accordance with
Appendix B, Subsection 9.
Stormwater Discharges Associated with Industrial Activity 16