Page 52 - California Stormwater Workshop Handouts

Industrial General Permit Order

C. Methods and Exceptions

1. The Discharger shall comply with the monitoring methods in this General
Permit and Attachment H.

2. pH Methods

a. Dischargers that are not subject to Subchapter N ELGs mandating pH
analysis related to acidic or alkaline sources and have never entered
Level 1 status for pH, are eligible to screen for pH using wide range
litmus pH paper or other equivalent pH test kits. The pH screen shall be
performed as soon as practicable, but no later than 15 minutes after the
sample is collected.

b. Dischargers subject to Subchapter N ELGs shall either analyze samples
for pH using methods in accordance with 40 Code of Federal
Regulations 136 for testing storm water or use a calibrated portable
instrument for pH.

c. Dischargers that enter Level 1 status (see Section XII.C) for pH shall, in
the subsequent reporting years, analyze for pH using methods in
accordance with 40 Code of Federal Regulations 136 or use a calibrated
portable instrument for pH.

d. Dischargers using a calibrated portable instrument for pH shall ensure
that all field measurements are conducted in accordance with the
accompanying manufacturer’s instructions.

3. Alternative Discharge Locations

a. The Discharger is required to identify, when practicable, alternative
discharge locations for any discharge locations identified in accordance
with Section XI.B.4 if the facility’s discharge locations are:

i. Affected by storm water run-on from surrounding areas that cannot
be controlled; and/or,

ii. Difficult to observe or sample (e.g. submerged discharge outlets,
dangerous discharge location accessibility).

b. The Discharger shall submit and certify via SMARTS any alternative
discharge location or revisions to the alternative discharge locations in
the Monitoring Implementation Plan.

4. Representative Sampling Reduction

a. The Discharger may reduce the number of locations to be sampled in
each drainage area (e.g., roofs with multiple downspouts,
loading/unloading areas with multiple storm drains) if the industrial

Order 2014-0057-DWQ 44