So einfach geht modernes Roaming fuer Notes und Nomad.pdf
2013 Ammonia Criteria Update by Tom Wallace, at REGFORM's 2013 Missouri Water Seminar, Sept. 5, 2013
1. 2013 Ammonia Criteria Update
Tom Wallace
Geosyntec Consultants
REGFORM Water Seminar
September 5-6, 2013
Columbia, Missouri
2. New vs. Old
Criteria magnitudes are expressed as total ammonia nitrogen (mg TAN/L) at pH = 7.8 and 26˚C. Criteria assume
Oncorhynchus spp. absent, early life stages (ELS) present, and Unionid mussels present.
3. Acute Ammonia Criteria
Lasmigona subviridis, Green Floater
Epioblasma capsaeformis, Oyster mussel
Villosa iris, Rainbow mussel
Lampsilis sp., River mussels
Normalized to pH 7.0 and 20˚C
4. Chronic Ammonia Criteria
Lampsilis spp., Wavy-rayed lamp mussel and
Fatmucker
Villosa iris, Rainbow mussel, Oyster mussel
Lepomis spp., Bluegill and Green sunfish
Musculium transversum, Long fingernailclam
Normalized to pH 7.0 and 20˚C
7. Flexibilities for States Applying EPA’s
Ammonia Criteria Recommendations
Recalculation Procedure for Site-Specific
Criteria Derivation
Site-specific pH and
Temperature?
Variances
Revisions to
Designated Uses
Dilution Allowances
Compliance
Schedules
8. Mussel Surveys
Objective – Determine
presence or absence of
Order Unionoida
Downstream extent subject
to ammonia impacts
Site-specific criteria
development:
Recalculation Procedure, or
Mussel absent criteria
(Appendix N)
Subject to EPA review
9. Distribution of 29 Common Mussel Species
from Order Unionoida
Source: MDC (1999), Missouri’s Freshwater Mussels
10. When may permits be affected?
New plants and plants with
currently planned ammonia
removal requirements
Now
All existing plants with
ammonia limits
Following adoption by Missouri
and as permits are re-issued.
Existing Plants with
Monitoring Only
Depending on the effluent data
11. Summary Points
The new ammonia criteria is out and it’s more stringent.
With no dilution or mixing zones (end-of-pipe), the likely average
monthly limits will be:
Summer: 0.6 mg/L….down from 1.4 mg/L
Winter: 2.2 mg/L…..down from 2.9 mg/L
Wastewater plants may struggle to consistently meet effluent limits
based on the new criteria.
There are flexibilities to conduct site-specific studies that may
potentially support higher effluent limits.
Timing will hinge on the current need to add ammonia removal,
Missouri’s adoption of the criteria, and permitting cycles.
12. Thank You!
For further information:
Tom Wallace
Geosyntec Consultants
1123 Wilkes Blvd., Suite 400
Columbia, Missouri 65201
Phone: 573.443.4100
Email: twallace@geosyntec.com