Page 56 - California Stormwater Workshop Handouts

Industrial General Permit Order

D. Facilities Subject to Federal Storm Water Effluent Limitation Guidelines
(ELGs)

1. In addition to the other requirements in this General Permit, Dischargers
with facilities subject to storm water ELGs in Subchapter N shall:

a. Collect and analyze samples from QSEs for each regulated pollutant
specified in the appropriate category in Subchapter N as specified in
Section XI.B;

b. For Dischargers with facilities subject to 40 Code of Federal Regulations
parts 41917 and 44318, estimate or calculate the volume of industrial
storm water discharges from each drainage area subject to the ELGs
and the mass of each regulated pollutant as defined in parts 419 and
443; and,

c. Ensure that the volume/mass estimates or calculations required in
subsection b are completed by a California licensed professional
engineer.

2. Dischargers subject to Subchapter N shall submit the information in Section
XI.D.1.a through c in their Annual Report.

3. Dischargers with facilities subject to storm water ELGs in Subchapter N are
ineligible for the Representative Sampling Reduction in Section XI.C.4.

XII. EXCEEDANCE RESPONSE ACTIONS (ERAs)

A. NALs and NAL Exceedances

The Discharger shall perform sampling, analysis and reporting in accordance
with the requirements of this General Permit and shall compare the results to
the two types of NAL values in Table 2 to determine whether either type of NAL
has been exceeded for each applicable parameter. The two types of potential
NAL exceedances are as follows:

1. Annual NAL exceedance: The Discharger shall determine the average
concentration for each parameter using the results of all the sampling and
analytical results for the entire facility for the reporting year (i.e., all "effluent"
data). The Discharger shall compare the average concentration for each
parameter to the corresponding annual NAL values in Table 2. For
Dischargers using composite sampling or flow-weighted measurements in
accordance with standard practices, the average concentrations shall be
calculated in accordance with the U.S. EPA’s NPDES Storm Water

17 Part 419 - Petroleum refining point source category
18 Part 443 - Effluent limitations guidelines for existing sources and standards of performance and pretreatment
standards for new sources for the paving and roofing materials (tars and asphalt) point source category

Order 2014-0057-DWQ 48