Page 20 - California Stormwater Workshop Handouts

Industrial General Permit Order

BMPs being implemented to ensure they are adequate to achieve compliance
with this General Permit.

65. U.S. EPA regulations at Subchapter N establish ELGs for storm water
discharges from facilities in 11 industrial categories. Dischargers subject to
these ELGs are required to comply with the applicable requirements.

66. Exceedances of the NALs that are attributable solely to pollutants originating
from non-industrial pollutant sources (such as run-on from adjacent facilities,
non-industrial portions of the Discharger’s property, or aerial deposition) are
not a violation of this General Permit because the NALs are designed to
provide feedback on industrial sources of pollutants. Dischargers may submit
a Non-Industrial Source Pollutant Demonstration as part of their Level 2 ERA
Technical Report to demonstrate that the presence of a pollutant causing an
NAL exceedance is attributable solely to pollutants originating from non-
industrial pollutant sources.

67. A Discharger who has designed, installed, and implemented BMPs to reduce
or prevent pollutants in industrial storm water discharges in compliance with
this General Permit may submit an Industrial Activity BMPs Demonstration, as
part of their Level 2 ERA Technical Report.

68. This General Permit establishes design storm standards for all treatment
control BMPs. These design standards are directly based on the standards in
State Water Board Order 2000-0011 regarding Standard Urban Storm Water
Mitigation Plans (SUSMPs). These design standards are generally expected
to be consistent with BAT/BCT, to be protective of water quality, and to be
effective for most pollutants. The standards are intended to eliminate the
need for most Dischargers to further treat/control industrial storm water
discharges that are unlikely to contain pollutant loadings that exceed the
NALs set forth in this General Permit.

N. Compliance Groups

69. Compliance Groups are groups of Dischargers (Compliance Group
Participants) that share common types of pollutant sources and industrial
activity characteristics. Compliance Groups provide an opportunity for the
Compliance Group Participants to combine resources and develop
consolidated Level 1 ERA Reports for Level 1 NAL exceedances and
appropriate BMPs for implementation in response to Level 2 status ERA
requirements that are representative of the entire Compliance Group.
Compliance Groups also provide the Water Boards and the public with
valuable information as to how industrial storm water discharges are affected
by non-industrial background pollutant sources (including natural background)
and geographic locations. When developing the next reissuance of this
General Permit, the State Water Board expects to have a better
understanding of the feasibility and benefits of sector-specific and watershed-
based permitting alternatives, which may include technology- or water quality-
based numeric effluent limitations. The effluent data, BMP performance data

Order 2014-0057-DWQ 12