Page 53 - California Stormwater Workshop Handouts

Industrial General Permit Order

activities, BMPs, and physical characteristics (grade, surface materials,
etc.) of the drainage area for each location to be sampled are
substantially similar to one another. To qualify for the Representative
Sampling Reduction, the Discharger shall provide a Representative
Sampling Reduction justification in the Monitoring Implementation Plan
section of the SWPPP.

b. The Representative Sampling Reduction justification shall include:

i. Identification and description of each drainage area and
corresponding discharge location(s);

ii. A description of the industrial activities that occur throughout the
drainage area;

iii. A description of the BMPs implemented in the drainage area;

iv. A description of the physical characteristics of the drainage area;

v. A rationale that demonstrates that the industrial activities and
physical characteristics of the drainage area(s) are substantially
similar; and,

vi. An identification of the discharge location(s) selected for
representative sampling, and rationale demonstrating that the
selected location(s) to be sampled are representative of the
discharge from the entire drainage area.

c. A Discharger that satisfies the conditions of subsection 4.b.i through v
above shall submit and certify via SMARTS the revisions to the
Monitoring Implementation Plan that includes the Representative
Sampling Reduction justification.

d. Upon submittal of the Representative Sampling Reduction justification,
the Discharger may reduce the number of locations to be sampled in
accordance with the Representative Sampling Reduction justification.
The Regional Water Board may reject the Representative Sampling
Reduction justification and/or request additional supporting
documentation. In such instances, the Discharger is ineligible for the
Representative Sampling Reduction until the Regional Water Board
approves the Representative Sampling Reduction justification.

5. Qualified Combined Samples

a. The Discharger may authorize an analytical laboratory to combine
samples of equal volume from as many as four (4) discharge locations if
the industrial activities, BMPs, and physical characteristics (grade,
surface materials, etc.) within each of the drainage areas are
substantially similar to one another.

Order 2014-0057-DWQ 45