Ov Over ervi view o of a Prop opos osed ed Eutrophication S - - PowerPoint PPT Presentation

Ov Over ervi view o

• f a Prop
• pos
• sed

ed Eutrophication S n Standar ard f for Ohio’s Large R Rivers

Eutrophication in Visual Context

165 μg/l

GMR when chlorophyll > 100 ug/l GMR when chlorophyll < 50 ug/l

Ohio Chlorophyll Levels in Context

Sestonic Chlorophyll ug/l Oligotrophic Eutrophic Mesotrophic 25th 50th 75th max 4.9 17 35 170 Van Nieuwenhuyse & Jones 1996 (all data) 25th 50th 75th max 13 34 69 337 Ohio (all data) 25th 50th 75th max 15 42 85 328 Thames Basin Maximums*

a 21 sampling stations sampled weekly over three years

Daily Water Column Chlorophyll in the GMR

36400 36500 36600 36700 36800 36900 37000 50 100 150

CHL ug/l USGS Data From 8/25/1999 to 4/15/2001 Near Bolton Well Field

Sep 99 Aug 00 Apr 01

Daily Oxygen Range and Chlorophyll

USGS Well Field Study

10 20 50 100 5 10 15 Sestonic Chlorophyll ug/l 24 h D.O. Range

2 5 10 20 50 100 200 5 10 15 20 Sestonic Chlorophyll ug/l 5-day BOD mg/l

5-day Biological Oxygen Demand and Chlorophyll

pre-construction grant levels elevated levels

Biological Indicators and Eutrophication

Rivers with legacy problems Rivers w/o legacy problems

3.5 4.0 4.5 5.0 30 35 40 45 50 55 Log10 Chla Fish IBI 3.8 4.2 4.6 5.0 30 35 40 45 50 55 Log10 TSS Fish IBI 3.0 3.2 3.4 3.6 3.8 4.0 10 20 30 40 Log10 BOD5 EPT 5 10 15 10 20 30 40 50 24 h D.O. Range Sensitives

Eutrophication S tandard - Box Model

Acceptable Enriched or Over Enriched Over Enriched Indicator Chronic Condition Acute Condition Sestonic Chlorophyll <30 ug/l as seasonal average Magnitude 30 < 100 ug/l seasonal average with biological impairment; Frequency > 30 < 100 ug/l as seasonal average in two of three years Magnitude > 100 ug/l anytime with biological impairment; Frequency > 100 ug/l multiple observations at base flow BOD5 <2.5 mg/l as seasonal average Magnitude > 2.5 < 6 mg/l seasonal average with biological impairment Frequency > 2.5 < 6 mg/l as seasonal average in two of three years Magnitude > 6 mg/l anytime with biological impairment and seasonal average chlorophyll > 30 ug/l Frequency > 6 mg/l two or more times during the base flow period 24-Hour D.O. Range <6.5 mg/l >7 mg/l – 9.0 mg/l (default to chlorophyll, BOD5 and biological indicators) Magnitude and Frequency ≥9.0 mg/l anytime with biological impairment TKN NA NA ≥0.75 mg/l May substitute for BOD5 TSS ~20 mg/l; general screening level for inspection of data sets lacking chlorophyll observations.

Phosphorus Target

1 2 3 4 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Log10 TP ug/l Log10 Chlorophyll ug/l

TSS, Flow and Chlorophyll

22.158 34.608 54.131 110.190 275.0 TSS 40360 40365 40370 40375 40380 40385 40390 1000 2000 3000 4000 6000 jDate Flow CFS 40360 40365 40370 40375 40380 40385 40390 1000 2000 3000 4000 6000 jDate Flow CFS

Flow TSS

GMR at Miamisburg; July 2010

Flow, TSS and Chlorophyll

500 2000 5000 20000 1 5 20 100 500 Flow CFS TSS mg/l 5.0 5.5 6.0 6.5 7.0 7.5 3.5 4.5 5.5 Log10 Iron Log10 TSS 2 5 10 20 50 200 2 5 20 100 500 Chlorophyll ug/l TSS mg/l 2 5 10 50 200 Chlorophyll ug/l Under Over

TSS|Fe

Distributions of Water Quality Parameters

Binned by Whether TSS is Under or Over Predicted

1 2 5 10 20 50 BOD5 mg/l Under Over

TSS|Fe

0.2 0.5 1.0 2.0 TKN mg/l Under Over

TSS|Fe

0.2 0.5 1.0 2.0 5.0 NOx mg/l Under Over

TSS|Fe

0.05 0.20 0.50 2.00 TP mg/l Under Over

TSS|Fe

Phosphorus Target

5 20 100 500 500 N:P TP ug/l <5 5-32 >32 0.05 0.20 1.00 5.00 N:P NOx ug/l <5 5-32 >32 50 150 250 350 N:P Chlorophyll ug/l <5 5-32 >32

• 1.5
• 0.5 0.0

0.5 1.0 N:P TSS as Chlorophyl <5 5-32 >32

52 759 357 52 759 357 12 115 12 52 759 357

S ummary of Findings and Considerations

• Evidence of over-enrichment is compelling
• Eutrophication benchmarks are defensible
• amenable to a box model
• TP target ~ 130 ug/l
• seasonal average; summer base-flow conditions

Going Forward

• 1. Peer-review publication
• 2. Share technical document and begin

dialogue with EPA Immediate & Near-Term

• 3. Start ESO
• 4. Add aspects of implementation to

technical document Medium-Term

• 5. Conclude ESO
• 6. Produce rule package

Long-Term