Stober, Trent, HDR Inc., 2015 Missouri Lake Nutrient Criteria, at Missouri Water Seminar, Sept. 4-5,...
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2015 Missouri Lake Nutrient Criteria TRENT STOBER 2014 Water Seminar
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Some history of the numeric nutrient criteria that were rejected by US EPA and analysis of new criteria that will be proposed.
Transcript of Stober, Trent, HDR Inc., 2015 Missouri Lake Nutrient Criteria, at Missouri Water Seminar, Sept. 4-5,...
2015 Missouri Lake Nutrient Criteria
TRENT STOBER
2014 Water Seminar
2009 Missouri Lake Nutrient Criteria
• Regional Criteria
– Regression Based
• Site-Specific Criteria
– 27 High Quality Reservoirs
– Existing Condition
• Tributary Arm Criteria
– Lake of the Ozarks
– Table Rock Lake
2009 Regional Lake Nutrient Criteria
Total Nitrogen Criteria – 20 x TP Chlorophyll Criteria
Plains Chl:TP = 0.44 Ozark Border and Ozark Highland
Chl:TP = 0.42
Total Phosphorus Criteria
2015 Lake Nutrient Criteria - Beneficial Uses
• Drinking Water Supply
– Taste & Odor
– Algal Toxins
• Whole Body Contact Recreation
– Transparency
• Aquatic Life Protection
– Sport Fish Yields
Whole Body Contact Recreation Approach
• Differs by Ecoregion
• Transparency (Secchi Depth)
• Change Point Analysis
• Algae-Nutrient Relationships
Whole Body Contact Recreation Approach
WQCWQCWQC
Whole Body Contact Recreation Approach
Whole Body Contact Recreation Approach
Montana Algal Target
Scientific and Technical Basis for Montana’s Numeric Nutrient Criteria
Microcystin in Missouri ReservoirsGraham and Jones 2009
Drinking Water Supply Protection ApproachAlgal Toxins
Microcystin Conc. (ug/L)
Total Phosphorus (ug/L)
Total Nitrogen
(ug/L)
Chlorophyll (ug/L)
Secchi Depth (m)
ND 32 646 11 1.2
0.1-1 47 891 26 0.9
> 1 76 1170 46 0.7
Proposed DWS 20 450 10 1.2
Microcystin in Missouri ReservoirsGraham and Jones 2009
Drinking Water Supply ProtectionAlgal Toxins
Aquatic Life Protection Approach
Lake EcoregionChl-a (µg/L)
Secchi depth (m)
Plains 30 0.6
Ozark Border 22 0.7
Ozark Highlands
15 0.9
Proposed Lake Nutrient Criteria
Table L: General Ecoregional nutrient criteria Lake Ecoregion
Lake Class TP (µg/L)
TN (µg/L)
Chl-a (µg/L)
Minimum Secchi Depth
(m)
Alternative Criteria
TP (µg/L)
TN (µg/L)
Plains L1 20 450 10.0 1.2 30 650 L2 20 550 12.0 1.2 40 900
L3 (WBC-A) 30 600 17.0 1.2 50 850 L3 (WBC-B) 50 800 30.0 0.6 90 1,200
Ozark Border
L1 20 450 10.0 1.5 30 650 L3 (WBC-A) 20 500 9.0 1.5 35 700 L3 (WBC-B) 40 650 22.0 0.7 80 1,050
Ozark Highlands
L1 & L2 10 300 6.0 2.0 20 450 L3 (WBC-A) 10 300 6.0 2.0 20 450 L3 (WBC-B) 30 600 15.0 0.9 40 800
Potential Impacts of Proposed Lake Nutrient Criteria
• Potential Impairments
• > 80% Reservoirs
• Most Major Reservoirs
– Lake of the Ozarks, Truman, Pomme de Terre, Stockton, Taneycomo, Wappapello
– Mark Twain, Smithville• Numerous TMDLs
• Permit Impacts
Issues for Further Discussion
• Use of Transparency to Set Criteria
• Change Point Analysis Approach
• Drinking Water Supply Approach
• Site-Specific Criteria Development
• Allowable Exceedance Frequency
• Implementation Approaches
Incremental Cost of Nutrient Removal
Algal Production Potential v. Greenhouse Gas Production
0
2,500
5,000
7,500
10,000
12,500
0
5,000
10,000
15,000
20,000
25,000
Level 1 (No N/P Rem)
Level 2 Level 3 Level 4 Level 5
GH
G E
mis
sio
ns
(CO
2 eq
mt
ton
s/yr
)
Alg
ae P
rod
uct
ion
per
Tre
atm
ent
Lev
el (
lb a
lgae
/d)
Algae Production GHG Emissions
The Fun is Just Beginning
Stream Nutrient Criteria Zone
Total Nitrogen (ug/L)
Total Phosphorus (ug/L)
I 900 75II 700 35III 500 31IV 430 10V 500 75
2010 Draft Missouri Stream and River Nutrient Criteria
