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EPA’s DRAFT AMBIENT WATER QUALITY
CRITERIA RECOMMENDATIONS for LAKES
and RESERVOIRS
Back on the menu
Rex Hunt, PE – Plummer Associates
June 17, 2020
EPA’s New Criteria Document:
• Released May 2020; Comments due July 21,
2020
• Unclear how fast the EPA might move to finalize
new criteria
• Impact on Texas lake managers and Texas
wastewater dischargers remains to be seen
WATERLINE REPLACEMENT PROJECTS City of Oklahoma City | PLUMMER
• Stressor-response models instead of reference water bodies
• Using new standardized, high quality WQ data obtained since 2000
• Draft criteria models are “nonregulatory”*
*…..if a state uses its discretion to not adopt new or revised nutrient criteria based on these CWA Section
304(a) criteria models, then the state shall provide an explanation when it submits the results of its triennial
review.”
• Assessment Endpoints Applicable to Texas Lakes
EPA’s WQ CRITERIA DOCUMENT-HIGHLIGHTS
WATERLINE REPLACEMENT PROJECTS City of Oklahoma City | PLUMMER
• Draft chlorophyll-a criteria for all lakes/reservoirs
• Based on modeled relationship between zooplankton and phytoplankton
• Based on modeled microcystin relationship to chlorophyll-a
POTENTIAL CHLOROPHYLL-a CRITERIA
Chlorophyll-a Criteria for all lakes (3 Depth Classes)
<3.2 m (~10 ft) 3.2 – 7.2 m (~10 – 24 ft) >7.2 m (~24 ft)
41 to 48 ug/L 22 to 36 ug/L 13 to 16 ug/L
Chlorophyll-a Criteria for protection of Microcystin targets
For Recreation MC target = 8 ug/L For Drinking Water MC target = 0.3 ug/L
2-35 ug/L 0.1-2 ug/L
WATERLINE REPLACEMENT PROJECTS City of Oklahoma City | PLUMMER
POTENTIAL NUTRIENT CRITERIA
Figure 28. Illustrative Example of
Deriving TP Criteria
Chl-a=20 ug/L; TP=~35 to 45 ug/L
Chl-a=10 ug/L; TP=~15-22 ug/l
Figure 32. Illustrative Example of
Deriving TN Criteria
Chl-a=20 ug/L; TN=~250 to 500 ug/L
Chl-a=10 ug/L; TN=~100 to 400 ug/L
NOTE: These nutrient criteria would be in-lake
concentrations, not effluent limits for wastewater discharges.
WATERLINE REPLACEMENT PROJECTS City of Oklahoma City | PLUMMER
INITIAL TAKEAWAYS
1. Stressor-Response model approach is better than the reference water
body approach previously used; but are the models valid? Correlation
does not necessarily mean causation.
2. The wide geographic range of data used by EPA may need to be
adjusted to fit Texas conditions.
3. TCEQ should be able to use the data it wants to use.
4. The assessment end point for all lakes (rate of change of zooplankton
to phytoplankton) could be a problem if you intend to develop your
own database to justify criteria.
5. Cyanobacteria as a risk indicator of microcystin is not always reliable.
6. The leap from chlorophyll-a concentrations to nutrient criteria for
phosphorus and nitrogen is problematic.
WATERLINE REPLACEMENT PROJECTS City of Oklahoma City | PLUMMER
• Discuss with colleagues:
• Is the approach appropriate for protection of lakes?
• Are the nutrient criteria achievable in wastewater treatment?
• Discuss with TCEQ
• What will their response be to this proposal?
• Comment on the draft: Comments are due July 21 to EPA
WHAT SHOULD WE DO UNTIL THEN?

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  • 1. EPA’s DRAFT AMBIENT WATER QUALITY CRITERIA RECOMMENDATIONS for LAKES and RESERVOIRS Back on the menu Rex Hunt, PE – Plummer Associates June 17, 2020 EPA’s New Criteria Document: • Released May 2020; Comments due July 21, 2020 • Unclear how fast the EPA might move to finalize new criteria • Impact on Texas lake managers and Texas wastewater dischargers remains to be seen
  • 2. WATERLINE REPLACEMENT PROJECTS City of Oklahoma City | PLUMMER • Stressor-response models instead of reference water bodies • Using new standardized, high quality WQ data obtained since 2000 • Draft criteria models are “nonregulatory”* *…..if a state uses its discretion to not adopt new or revised nutrient criteria based on these CWA Section 304(a) criteria models, then the state shall provide an explanation when it submits the results of its triennial review.” • Assessment Endpoints Applicable to Texas Lakes EPA’s WQ CRITERIA DOCUMENT-HIGHLIGHTS
  • 3. WATERLINE REPLACEMENT PROJECTS City of Oklahoma City | PLUMMER • Draft chlorophyll-a criteria for all lakes/reservoirs • Based on modeled relationship between zooplankton and phytoplankton • Based on modeled microcystin relationship to chlorophyll-a POTENTIAL CHLOROPHYLL-a CRITERIA Chlorophyll-a Criteria for all lakes (3 Depth Classes) <3.2 m (~10 ft) 3.2 – 7.2 m (~10 – 24 ft) >7.2 m (~24 ft) 41 to 48 ug/L 22 to 36 ug/L 13 to 16 ug/L Chlorophyll-a Criteria for protection of Microcystin targets For Recreation MC target = 8 ug/L For Drinking Water MC target = 0.3 ug/L 2-35 ug/L 0.1-2 ug/L
  • 4. WATERLINE REPLACEMENT PROJECTS City of Oklahoma City | PLUMMER POTENTIAL NUTRIENT CRITERIA Figure 28. Illustrative Example of Deriving TP Criteria Chl-a=20 ug/L; TP=~35 to 45 ug/L Chl-a=10 ug/L; TP=~15-22 ug/l Figure 32. Illustrative Example of Deriving TN Criteria Chl-a=20 ug/L; TN=~250 to 500 ug/L Chl-a=10 ug/L; TN=~100 to 400 ug/L NOTE: These nutrient criteria would be in-lake concentrations, not effluent limits for wastewater discharges.
  • 5. WATERLINE REPLACEMENT PROJECTS City of Oklahoma City | PLUMMER INITIAL TAKEAWAYS 1. Stressor-Response model approach is better than the reference water body approach previously used; but are the models valid? Correlation does not necessarily mean causation. 2. The wide geographic range of data used by EPA may need to be adjusted to fit Texas conditions. 3. TCEQ should be able to use the data it wants to use. 4. The assessment end point for all lakes (rate of change of zooplankton to phytoplankton) could be a problem if you intend to develop your own database to justify criteria. 5. Cyanobacteria as a risk indicator of microcystin is not always reliable. 6. The leap from chlorophyll-a concentrations to nutrient criteria for phosphorus and nitrogen is problematic.
  • 6. WATERLINE REPLACEMENT PROJECTS City of Oklahoma City | PLUMMER • Discuss with colleagues: • Is the approach appropriate for protection of lakes? • Are the nutrient criteria achievable in wastewater treatment? • Discuss with TCEQ • What will their response be to this proposal? • Comment on the draft: Comments are due July 21 to EPA WHAT SHOULD WE DO UNTIL THEN?