2013 Ammonia Criteria Update
Tom Wallace
Geosyntec Consultants
REGFORM Water Seminar
September 5-6, 2013
Columbia, Missouri
New vs. Old
Criteria magnitudes are expressed as total ammonia nitrogen (mg TAN/L) at pH = 7.8 and 26˚C. Criteria assume
O...
Acute Ammonia Criteria
 Lasmigona subviridis, Green Floater
 Epioblasma capsaeformis, Oyster mussel
 Villosa iris, Rain...
Chronic Ammonia Criteria
 Lampsilis spp., Wavy-rayed lamp mussel and
Fatmucker
 Villosa iris, Rainbow mussel, Oyster mus...
Potential Permit Limits
Small lagoon
Big River
Max dilution
ZID = 10 x DAF
Small stream
WWTF
Zero Dilution
Typical Ammonia Effluent
Flexibilities for States Applying EPA’s
Ammonia Criteria Recommendations
 Recalculation Procedure for Site-Specific
Crite...
Mussel Surveys
 Objective – Determine
presence or absence of
Order Unionoida
 Downstream extent subject
to ammonia impac...
Distribution of 29 Common Mussel Species
from Order Unionoida
Source: MDC (1999), Missouri’s Freshwater Mussels
When may permits be affected?
New plants and plants with
currently planned ammonia
removal requirements
Now
All existing p...
Summary Points
 The new ammonia criteria is out and it’s more stringent.
 With no dilution or mixing zones (end-of-pipe)...
Thank You!
For further information:
Tom Wallace
Geosyntec Consultants
1123 Wilkes Blvd., Suite 400
Columbia, Missouri 6520...
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2013 Ammonia Criteria Update by Tom Wallace, at REGFORM's 2013 Missouri Water Seminar, Sept. 5, 2013

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2013 Ammonia Criteria Update by Tom Wallace, at REGFORM's 2013 Missouri Water Seminar, Sept. 5, 2013

  1. 1. 2013 Ammonia Criteria Update Tom Wallace Geosyntec Consultants REGFORM Water Seminar September 5-6, 2013 Columbia, Missouri
  2. 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. 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. 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
  5. 5. Potential Permit Limits Small lagoon Big River Max dilution ZID = 10 x DAF Small stream WWTF Zero Dilution
  6. 6. Typical Ammonia Effluent
  7. 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. 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. 9. Distribution of 29 Common Mussel Species from Order Unionoida Source: MDC (1999), Missouri’s Freshwater Mussels
  10. 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. 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. 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

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