Page 193 - California Stormwater Workshop Handouts

ATTACHMENT G

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

after the discharge and receiving water is fully characterized, but is best made
after the monitoring results from the first permit cycle are assessed.

3. Regional Integrated Monitoring Program: ASBS Dischargers may elect to
participate in a regional integrated monitoring program, in lieu of an individual
monitoring program, to fulfill the requirements for monitoring the physical,
chemical, and biological characteristics of the ocean receiving waters within their
ASBS. This regional approach shall characterize natural water quality, pre- and
post-storm, in ocean reference areas near the mouths of identified open space
watersheds and the effects of the discharges on natural water quality (physical,
chemical, and toxicity) in the ASBS receiving waters, and should include benthic
marine aquatic life and bioaccumulation components. The design of the ASBS
stratum of a regional integrated monitoring program may deviate from the
otherwise prescribed individual monitoring approach (in Section I.2.) if approved
by the State Water Board’s Division of Water Quality and the Regional Water
Boards.

a. Ocean reference areas shall be located at the drainages of flowing
watersheds with minimal development (in no instance more than 10%
development), and shall not be located in CWA Section 303(d) listed
waterbodies or have tributaries that are 303(d) listed. Reference areas shall
be free of wastewater discharges and anthropogenic non-storm water runoff.
A minimum of low threat storm runoff discharges (e.g. stream highway
overpasses and campgrounds) may be allowed on a case-by-case basis.
Reference areas shall be located in the same region as the ASBS receiving
water monitoring occurs. The reference areas for each Region are subject to
approval by the participants in the regional integrated monitoring program, the
State Water Board’s Division of Water Quality and the applicable Regional
Water Board(s). A minimum of three ocean reference water samples must be
collected from each station, each from a separate storm during the same
storm season that receiving water is sampled. A minimum of one reference
location shall be sampled for each ASBS receiving water site sampled per
responsible party. For parties discharging to ASBS in more than one
Regional Water Board region, at a minimum, one reference station and one
receiving water station shall be sampled in each region.

b. ASBS ocean receiving water must be sampled in the surf zone at the location
where the runoff makes contact with ocean water (i.e. at “point zero”). Ocean
receiving water stations must be representative of worst-case discharge
conditions (i.e. co-located at a large drain greater than 36 inches, or if drains
greater than 36 inches are not present in the ASBS then the largest drain
greater than18 inches.) Ocean receiving water stations are subject to
approval by the participants in the regional monitoring program and the State
Water Board’s Division of Water Quality and the applicable Regional Water
Board(s). A minimum of three ocean receiving water samples must be
collected during each storm season from each station, each from a separate

Order 2014-0057-DWQ 12