Page 191 - California Stormwater Workshop Handouts

ATTACHMENT G

REQUIREMENTS FOR DISCHARGERS WHO HAVE BEEN GRANTED AN
OCEAN PLAN EXCEPTION FOR DISCHARGES TO ASBS

larger outfalls, whichever is greater, shall be sampled (flow weighted
composite samples) at least three times annually during wet weather (storm
event) and analyzed for all Ocean Plan Table A constituents, Table B
constituents (Table A and B constituents are provided at the end of this
Attachment) for marine aquatic life protection (except for toxicity, only chronic
toxicity for three species shall be required), DDT, PCBs, Ocean Plan PAHs,
OP pesticides, pyrethroids, nitrates, phosphates, and Ocean Plan indicator
bacteria. For parties discharging to ASBS in more than one Regional Water
Board region, at a minimum, one (the largest) such discharge shall be
sampled annually in each Region.

d. The Executive Director may reduce or suspend core monitoring once the
storm runoff is fully characterized. This determination may be made at any
point after the discharge is fully characterized, but is best made after the
monitoring results from the first permit cycle are assessed.

I. Ocean Receiving Water and Reference Area Monitoring Program

1. In addition to performing the Core Discharge Monitoring Program in Section H.
above, all ASBS Dischargers must perform ocean receiving water monitoring. In
order to fulfill the requirements for monitoring the physical, chemical, and
biological characteristics of the ocean receiving waters within their ASBS, ASBS
Dischargers may choose either (1) an individual monitoring program, or (2)
participation in a regional integrated monitoring program.

2. Individual Monitoring Program: The requirements listed below are for those
ASBS Dischargers who elect to perform an individual monitoring program to fulfill
the requirements for monitoring the physical, chemical, and biological
characteristics of the ocean receiving waters within the affected ASBS. In
addition to Core Discharge Monitoring, the following additional monitoring
requirements shall be met:

a. Three times annually, during wet weather (storm events), the receiving water
at the point of discharge from the outfalls described in Section H.3. above
shall be sampled and analyzed for Ocean Plan Table A constituents, Table B
constituents (Table A and B constituents are provided at the end if this
Attachment) for marine aquatic life, DDT, PCBs, Ocean Plan PAHs, OP
pesticides, pyrethroids, nitrates, phosphates, salinity, chronic toxicity (three
species), and Ocean Plan indicator bacteria.

The sample location for the ocean receiving water shall be in the surf zone at
the point of discharges; this must be at the same location where storm water
runoff is sampled. Receiving water shall be sampled prior to (pre-storm), and
during (or immediately after) the same storm (post-storm). Post-storm
sampling shall be during the same storm and at approximately the same time
as when the runoff is sampled. Reference water quality shall also be

Order 2014-0057-DWQ 10