Page 47 - California Stormwater Workshop Handouts

Industrial General Permit Order

4. The Discharger shall revise BMPs as necessary when the visual
observations indicate pollutant sources have not been adequately
addressed in the SWPPP.

B. Sampling and Analysis

1. A Qualifying Storm Event (QSE) is a precipitation event that:

a. Produces a discharge for at least one drainage area; and,

b. Is preceded by 48 hours with no discharge from any drainage area.

2. The Discharger shall collect and analyze storm water samples from two (2)
QSEs within the first half of each reporting year (July 1 to December 31),
and two (2) QSEs within the second half of each reporting year (January 1
to June 30).

3. Compliance Group Participants are only required to collect and analyze
storm water samples from one (1) QSE within the first half of each reporting
year (July 1 to December 31) and one (1) QSE within the second half of the
reporting year (January 1 to June 30).

4. Except as provided in Section XI.C.4 (Representative Sampling Reduction),
samples shall be collected from each drainage area at all discharge
locations. The samples must be:

a. Representative of storm water associated with industrial activities and
any commingled authorized NSWDs; or,

b. Associated with the discharge of contained storm water.

5. Samples from each discharge location shall be collected within four (4)
hours of:

a. The start of the discharge; or,

b. The start of facility operations if the QSE occurs within the previous
12-hour period (e.g., for storms with discharges that begin during the
night for facilities with day-time operating hours). Sample collection is
required during scheduled facility operating hours and when sampling
conditions are safe in accordance with Section XI.C.6.a.ii.

6. The Discharger shall analyze all collected samples for the following
parameters:

a. Total suspended solids (TSS) and oil and grease (O&G);

b. pH (see Section XI.C.2);

Order 2014-0057-DWQ 39