MIL-HDBK-1005/16
2.2.2.1
Stormwater NPDES Permit. In accordance with 40 CFR
122.26, stormwater associated with industrial activities is
managed under a separate stormwater NPDES program. FOTWs that
treat more than 1 million gallons per day (mgd) (4 million liters
per day [ML/d]) are included in the stormwater NPDES permitting
program as a categorical industrial facility. Although
stormwater could be included in the operating permit listed
above, most facilities obtain a general stormwater NPDES permit.
This permit is maintained separately from the other permit and
would require special reporting or applications. Construction of
wastewater treatment plants over 5 acres in area will require a
stormwater construction permit.
2.2.2.2
Residual Solids Permit. FOTW residual solids
management has received special attention under the Code of
Federal Regulations (CFR) 40 Part 503. Solids management will
typically be addressed as part of the FOTW operating permit.
However, even if there is no discharge to state or Federal waters
and, consequently, no discharge permit, a separate permit for the
solids may still be required.
2.2.3
Permit Renewal. NPDES permits are valid for up to
5 years. Permit renewal applications must be submitted 180 days
(about 6 months) before the expiration date. Ideally,
preparation for the application begins about 1 year before the
permit application is due. Preparation involves assessing plant
performance and improvement needs and conducting the necessary
planning and design required to keep the facility in compliance.
Document this review in a Capacity Analysis Report and an
Operation and Maintenance Report, as described below. These
reports are typically prepared by licensed engineering staff.
Each of these reports may take a couple of months to develop and
may lead to additional work, so a 1-year lead time is not
excessive.
If the permit renewal is due and the assessments are
not complete, the FOTW must still apply 180 days before the
deadline. Failure to apply in a timely manner is a permit
violation. Changes to the permit can be applied for at any time
during the permit duration. There may be an additional fee for
each permit modification application. Combining requests for
changes with the permit renewal application is often convenient.
If the existing permit is being violated regularly, the FOTW may
need to conduct the facilities planning assessments described in
par. 2.5 and act before permit expiration.
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