Stormwater Pollution Prevention Plan - Phoenix Sky Harbor ...

Non-mining MSGP 2010 General Permit
4.1.3 Exceptions to Routine Facility Inspections
Inactive and Unstaffed Sites: The requirement to conduct routine facility inspections on a
quarterly basis does not apply to a facility that is inactive and unstaffed, provided that no
industrial materials or activities are exposed to stormwater. Such a facility is only required to
conduct an annual comprehensive facility inspection in accordance with the requirements of Part
4.3. To invoke this exception, the permittee shall do the following:
Maintain a statement in the SWPPP pursuant to 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.
If circumstances change and industrial materials or activities become exposed to
stormwater or the facility becomes active and/or staffed, this exception no longer applies
and the permittee shall immediately resume quarterly inspections.
If, during the period of coverage under this permit, the facility becomes qualified for the
inactive and unstaffed exception, and there are no industrial materials or activities
exposed to stormwater, then the permittee shall include the same signed and certified
statement as above and retain it pursuant to Part 5.4.
For permittees with inactive and unstaffed facilities that are unable to meet the “no industrial
materials or activities exposed to stormwater” standard, the frequency of inspections is reduced
to one routine inspection and one CFI each calendar year. These two inspections shall be
conducted in the opposing wet seasons and at least three months apart. The SWPPP shall
include documentation that the facility is unable to meet this standard and the results of the
inspections. Compliance with any additional sector-specific conditions in Part 8 is still required.
4.2 Visual Assessment of Stormwater Discharges
The permittee shall perform two visual assessments during the summer wet season and two
visual assessments during the winter wet season when the facility is discharging.
Wet seasons, for the purposes of visual assessments, are defined as follows:
Summer wet season: June 1 – October 31
Winter wet season: November 1 – May 31
The term ‘wet season’ applies statewide and includes areas of the state where freezing
conditions exist that prevent runoff from occurring for extended periods. In areas where freezing
conditions exist, the four visual assessments may be distributed during seasons when
precipitation runoff occurs.
Visual assessment monitoring requirements in this permit begin immediately after authorization to
discharge is received by the permittee unless authorization is received 90 calendar days or more
after a wet season has begun, in which case visual assessment monitoring shall commence with
the start of the next wet season.
4.2.1 Visual Assessment Procedures
Visual assessment samples are not required to be collected consistent with 40 CFR Part 136
procedures.
The visual assessment shall be made:
Of a sample in a clean, clear glass, or plastic container, and examined in a well-lit area;
On samples collected within the first 30 minutes of an actual discharge from a storm event. If
it is not possible to collect the sample within the first 30 minutes of discharge, the sample
must be collected as soon as practicable after the first 30 minutes and the permittee shall
document why it was not possible to take samples within the first 30 minutes. In the case of
Stormwater Discharges Associated with Industrial Activity 15