Page 190 - California Stormwater Workshop Handouts

ATTACHMENT G

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

measured or calculated, using a method acceptable to and approved by the
Executive Director.

b. This will be reported annually for each precipitation season to the Executive
Director.

3. Runoff samples – storm events

a. For outfalls equal to or greater than 18 inches (0.46m) in diameter or width:
1) samples of storm water runoff shall be collected during the same storm as
receiving water samples and analyzed for oil and grease, total suspended
solids, and, if within the range of the southern sea otter, indicator bacteria or
some other measure of fecal contamination; and 2) samples of storm water
runoff shall be collected and analyzed for critical life stage chronic toxicity
(one invertebrate or algal species) at least once during each storm season
when receiving water is sampled in the ASBS.

b. For outfalls equal to or greater than 36 inches (0.91m) in diameter or width:

1) samples of storm water runoff shall be collected during the same storm as
receiving water samples and analyzed for oil and grease, total suspended
solids, and, if within the range of the southern sea otter, indicator bacteria
or some other measure of fecal contamination; and

2) samples of storm water runoff shall be further collected during the same
storm as receiving water samples and analyzed for Ocean Plan Table B
metals (provided at the end of this Attachment) for protection of marine
life, Ocean Plan polynuclear aromatic hydrocarbons (PAHs), current use
pesticides (pyrethroids and OP pesticides), and nutrients (ammonia,
nitrate and phosphates); and

3) samples of storm water runoff shall be collected and analyzed for critical
life stage chronic toxicity (one invertebrate or algal species) at least once
during each storm season when receiving water is sampled in the ASBS.

4) if an ASBS Discharger has no outfall greater than 36 inches, then storm
water runoff from the applicant’s largest outfall shall be further collected
during the same storm as receiving water samples and analyzed for
Ocean Plan Table B metals (provided at the end of this Attachment) for
protection of marine life, Ocean Plan polynuclear aromatic hydrocarbons
(PAHs), current use pesticides (pyrethroids and OP pesticides), and
nutrients (ammonia, nitrate and phosphates).

c. For an applicant not participating in a regional integrated monitoring program
[see below in Section I.3.] in addition to the sampling requirements in Section
H.3.a. and b. above, a minimum of the two largest outfalls or 20 percent of the

Order 2014-0057-DWQ 9