Page 192 - California Stormwater Workshop Handouts

ATTACHMENT G

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

sampled three times annually and analyzed for the same constituents pre-
storm and post-storm, during the same storm seasons when receiving water
is sampled. Reference stations will be determined by the State Water
Board’s Division of Water Quality and the applicable Regional Water
Board(s).

b. Sediment sampling shall occur at least three times during every five (5) year
period. The subtidal sediment (sand or finer, if present) at the discharge shall
be sampled and analyzed for Ocean Plan Table B constituents (provided at
the end of this Attachment) for marine aquatic life, DDT, PCBs, PAHs,
pyrethroids, and OP pesticides. For sediment toxicity testing, only an acute
toxicity test using the amphipod Eohaustorius estuarius must be performed.

c. A quantitative survey of intertidal benthic marine life shall be performed at the
discharge and at a reference site. The survey shall be performed at least
once every five (5) year period. The survey design is subject to approval by
the Regional Water Board and the State Water Board’s Division of Water
Quality. The results of the survey shall be completed and submitted to the
State Water Board and Regional Water Board at least six months prior to the
end of the permit cycle.

d. Once during each five (5) year period, a bioaccumulation study shall be
conducted to determine the concentrations of metals and synthetic organic
pollutants at representative discharge sites and at representative reference
sites. The study design is subject to approval by the Regional Water Board
and the State Water Board’s Division of Water Quality. The bioaccumulation
study may include California mussels (Mytilus californianus) and/or sand
crabs (Emerita analoga or Blepharipoda occidentalis). Based on the study
results, the Regional Water Board and the State Water Board’s Division of
Water Quality, may adjust the study design in subsequent permits, or add or
modify additional test organisms (such as shore crabs or fish), or modify the
study design appropriate for the area and best available sensitive measures
of contaminant exposure.

e. Marine Debris: Representative quantitative observations for trash by type and
source shall be performed along the coast of the ASBS within the influence of
the ASBS Discharger’s outfalls. The design, including locations and
frequency, of the marine debris observations is subject to approval by the
Regional Water Board and State Water Board’s Division of Water Quality.

f. The monitoring requirements of the Individual Monitoring Program in this
Section are minimum requirements. After a minimum of one (1) year of
continuous water quality monitoring of the discharges and ocean receiving
waters, the Executive Director of the State Water Board may require
additional monitoring, or adjust, reduce or suspend receiving water and
reference station monitoring. This determination may be made at any point

Order 2014-0057-DWQ 11