Page 98 - California Stormwater Workshop Handouts

Industrial General Permit Fact Sheet

5. General Permit Coverage for Small Municipal Separate Storm Sewer Systems
(MS4s)

Section 1068 of the Intermodal Surface Transportation Efficiency Act of 1991
exempted municipal agencies serving populations of less than 100,000 from Phase I
permit requirements other than sanitary landfills, power plants, and airports facilities.
U.S. EPA’s Phase II regulations eliminated the above exemption as of
March 10, 2003. All facilities in Attachment A of this General Permit that are
operated by a small municipal agency are subject to NPDES storm water permitting
requirements and this General Permit.

6. Changes to General Permit Coverage

Dischargers who no longer operate a facility required to be covered under this
General Permit (either NOI or NEC coverage) are required to electronically certify
and submit via SMARTS a Notice of Termination (NOT). An NOT is required when
there is a change in ownership of the industrial activities subject to permitting or
when industrial activities subject to permitting are permanently discontinued by the
Discharger at the site. When terminating NOI coverage, Dischargers may only
submit an NOT once all exposure of industrial materials and equipment have been
eliminated. Dischargers may not submit NOTs for temporary or seasonal facility
closures. The General Permit requires Dischargers to implement appropriate BMPs
to reduce or prevent pollutants in storm water discharges during the temporary
facility closure.

This General Permit allows Dischargers to change General Permit coverage, as
appropriate, from NOI coverage to NEC coverage or from NEC coverage to NOI
coverage.

B. Discharge Prohibitions

This General Permit covers industrial storm water discharges and authorized NSWDs
from industrial facilities and prohibits any discharge of materials other than storm water
and authorized NSWDs (Section III and Section IV of this General Permit). It is a
violation of this General Permit to discharge hazardous substances in storm water in
excess of the reportable quantities established in 40 Code of Federal Regulations
sections 117.3 and 302.4.

The State Water Board is authorized, under Water Code section 13377, to issue
NPDES permits which apply and ensure compliance with all applicable provisions of the
CWA, and any more stringent limitations necessary to implement water quality control
plans, protect beneficial uses, and prevent nuisance.

C. Non-Storm Water Discharges (NSWDs)

Unauthorized NSWDs can be generated from various pollutant sources. Depending
upon their quantity and location where generated, unauthorized NSWDs can discharge
to the storm drain system during dry weather as well as during a storm event
(comingled with storm water discharge). These NSWDs can consist of, but are not
limited to; (1) waters generated by the rinsing or washing of vehicles, equipment,

Order 2014-0057-DWQ 14