EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 ....
Transcript of EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 ....
![Page 1: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/1.jpg)
EPA’s Draft Aluminum Criteria
Published: July 28, 2017
Comments Due: Sept. 20, 2017
![Page 2: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/2.jpg)
1988 Aluminum Criteria
• Acute criteria = 750 ug/L (1 hour exposure) • Chronic criteria = 87 ug/L (4 day exposure) • Not adopted as a water quality objective
– Not in Santa Ana Basin Plan – Not in California Toxics Rule or National Toxics Rule – Sometimes used as narrative translator (ex. 303d)
• Many known problems with the 1988 criteria
![Page 3: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/3.jpg)
2017 Draft Aluminum Criteria
• Variable criteria, adjusted for: – pH – Hardness – Dissolved Organic Carbon (DOC)
• EPA provides spreadsheet tool to calculate Total Recoverable Aluminum concentration
• Not binding until the state approves the criteria as a water quality standard.
![Page 4: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/4.jpg)
Comparison: New vs. Old
U.S. EPA. Fact Sheet: Draft Aquatic Life Ambient Water Quality Criteria for Aluminum in Freshwaters. July, 2017
![Page 5: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/5.jpg)
Alum Application Program
• Alum (aluminum sulfate) is 9% aluminum
• 40 mg/L of Alum = 3,600 ug/L of aluminum (40 mg/L (ppm) = 40,000 ug/L (ppb)
• Binds with phosphorus to form aluminum phosphate (inert and insoluble)
• Site-specific testing demonstrated that alum was not toxic in Canyon Lake water
![Page 6: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/6.jpg)
Estimated Criteria for Canyon Lake EPA Spreadsheet Tool* ACUTE (CMC) CHRONIC (CCC)
Constrained Input Values pH=8.2, Hardness=150, DOC=5.0
4,400 ug/L 2,300 ug/L
Unconstrained Input Values pH=8.2, Hardness=300, DOC=20.0
8,000 ug/L 2,800 ug/L
Table K-7 & Table K-8 Values (draft) Ph=8.0, Hardness=300, DOC=5.0
4,700 ug/L 2,000 ug/L
EPA advises discretion in applying spreadsheet tool when site-specific input values are outside the range of values used to develop the model equation.
*EPA Aluminum Criteria Calculator V.1.0.xlsx
![Page 7: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/7.jpg)
Focus of Comment Letter • Develop separate warm & cold water criteria.
• Expand model domain to include higher hardness values (>150 mg/L) common to arid west waters.
• Expand model domain to include higher DOC values (>5 mg/L) common in warm water lakes.
• Affirm ability to use the Water Effects Ratio (WER) procedure to develop site-specific aluminum criteria.
• Special consideration/exception for Alum applications; at a minimum, only the acute criteria should be applied to applications made in accordance with label.
![Page 8: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/8.jpg)
Lake Elsinore and Canyon Lake TMDL Water Quality Monitoring Update – 2016-17 Summary
August 15, 2017
![Page 9: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/9.jpg)
Lake Elsinore and Canyon Lake TMDL Water Quality Monitoring Update – 2016-17 Summary
Watershed Monitoring
![Page 10: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/10.jpg)
Summary of 2016-2017 Watershed Monitoring and Nutrient Loads
Number and Location Description
Annual Flow
(Mgal)
Annual Event Mean Storm Concentration (mg/L) Estimated Annual Load (kg)
Total Nitrogen
Total Phosphorus
Total Nitrogen
Total Phosphorus
Site 3 - Salt Creek at Murrieta Road 1,596 2.07 0.62 12,366 4,026
Site 4 - San Jacinto River at Goetz 2,802 2.03 1.23 21,651 14,403
Site 6 - San Jacinto River at Ramona Expressway 0 - - - -
Site 30 - Canyon Lake Spillway 4,850 1.85 0.36 33,759 6,637
Site 1 - San Jacinto River at Cranston Guard Station 6,194 Not Measured Not Measured Not Measured Not Measured
![Page 11: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/11.jpg)
Summary of 2016-2017 Monthly Flow
Mean Monthly Flow (cfs) Site 3 - Salt Creek
Site 4 - San Jacinto River
Site 6 - San Jacinto River at
Ramona Expressway
Site 30 - Canyon Lake
Spillway
Site 1 - San Jacinto River at Cranston
Guard Station
July 0.00 0.00 - 3.10 0.05 August 0.00 0.00 - 2.89 0.03
September 0.00 0.00 - 0.16 0.01 October 0.17 0.00 - 0.15 0.02
November 3.67 3.01 - 0.67 0.05 December 23.51 32.95 - 25.80 14.41 January 43.55 90.61 - 176.06 72.75 February 9.01 14.48 - 25.04 125.53
March 0.73 0.31 - 6.39 86.86 April 0.00 0.00 - 1.03 15.60 May 0.00 0.00 - 2.98 5.71 June 0.00 0.00 - 0.27 0.84
Mean Annual Flow (cfs) 6.98 12.26 - 20.56 27.77
![Page 12: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/12.jpg)
Summary of 2016-2017 Rainfall
Monthly Rainfall (inches)
Lake Elsinore Perris CDF Pigeon
Pass Hemet / San
Jacinto Winchester
Jul 0.00 0.00 0.00 0.00 0.00 Aug 0.00 0.00 0.00 0.00 0.00 Sep 0.08 0.08 0.00 0.16 0.12 Oct 0.24 0.35 0.78 0.34 0.28 Nov 0.98 0.90 1.35 1.09 1.03 Dec 3.60 3.21 3.94 3.20 3.17 Jan 6.68 6.04 6.78 6.23 4.86 Feb 3.02 2.06 2.61 2.86 2.31 Mar 0.03 0.02 0.16 0.21 0.06 Apr 0.02 0.00 0.02 0.00 0.00 May 0.27 0.06 0.26 0.25 0.08 Jun 0.00 0.00 0.00 0.00 0.02
Annual Rainfall (Inches) 14.92 12.72 15.90 14.34 11.93
![Page 13: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/13.jpg)
7/1/16
8/1/16
9/1/16
10/1/
16
11/1/
16
12/1/
161/1
/172/1
/173/1
/174/1
/175/1
/176/1
/17
0
200
400
600
800
1000
1200
1400
Dis
char
ge (c
fs)
Flow (cfs)
Site 3 - Salt Creek at Murrieta RoadUSGS 11070465
2016-2017 Annual Hydrograph
![Page 14: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/14.jpg)
7/1/16
8/1/16
9/1/16
10/1/
16
11/1/
16
12/1/
161/1
/172/1
/173/1
/174/1
/175/1
/176/1
/17
0
200
400
600
800
1000
1200
1400
1600
1800
Dis
char
ge (c
fs)
Flow (cfs)
Site 4 - San Jacinto River at Goetz RoadUSGS 11070365
2016-2017 Annual Hydrograph
![Page 15: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/15.jpg)
7/1/16
8/1/16
9/1/16
10/1/
16
11/1/
16
12/1/
161/1
/172/1
/173/1
/174/1
/175/1
/176/1
/17
0
500
1000
1500
2000
2500
3000
3500
4000
Dis
char
ge (c
fs)
Flow (cfs)
Site 30 - Canyon Lake Spillway USGS 11070500
2016-2017 Annual Hydrograph
![Page 16: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/16.jpg)
2016-2017 Annual Hydrograph
7/1/16
8/1/16
9/1/16
10/1/
16
11/1/
16
12/1/
161/1
/172/1
/173/1
/174/1
/175/1
/176/1
/17
1376
1377
1378
1379
1380
1381
1382
1383
1384
Can
yon
Lake
Lev
el (f
t.)
Water LevelSpillway
Canyon Lake at Railroad Canyon Dam Spillway
![Page 17: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/17.jpg)
7/1/16
8/1/16
9/1/16
10/1/
16
11/1/
16
12/1/
161/1
/172/1
/173/1
/174/1
/175/1
/176/1
/17
0
200
400
600
800
1000
1200
Dis
char
ge (c
fs)
Flow (cfs)
Site 1 - San Jacinto River at Cranston Guard Station USGS 11069500
2016-2017 Annual Hydrograph
![Page 18: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/18.jpg)
12/15
/16 20
:00
12/16
/16 04
:00
12/16
/16 12
:00
12/16
/16 20
:00
12/17
/16 04
:00
12/17
/16 12
:00
12/17
/16 20
:00
12/18
/16 04
:00
12/18
/16 12
:00
12/18
/16 20
:00
12/19
/16 04
:00
0
10
20
30
40
50
60
70
80
90
100
Dis
char
ge (c
fs)
Flow (cfs)Composite Sample
Site 3 - Salt Creek at Murrieta RoadUSGS 11070465
12/16
/16 00
:00
12/16
/16 08
:00
12/16
/16 16
:00
12/17
/16 00
:00
12/17
/16 08
:00
12/17
/16 16
:00
12/18
/16 00
:00
12/18
/16 08
:00
12/18
/16 16
:00
0
10
20
30
40
50
60
Dis
char
ge (c
fs)
Flow (cfs)Composite Sample
Site 4 - San Jacinto River at Goetz RoadUSGS 11070365
Wet Event #1 December 16-18, 2016
Rainfall: 0.43 to 0.78 inches
Sites: Salt Creek and San Jacinto
![Page 19: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/19.jpg)
1/19/1
7 00:0
0
1/19/1
7 08:0
0
1/19/1
7 16:0
0
1/20/1
7 00:0
0
1/20/1
7 08:0
0
1/20/1
7 16:0
0
1/21/1
7 00:0
0
1/21/1
7 08:0
0
1/21/1
7 16:0
0
1/22/1
7 00:0
0
1/22/1
7 08:0
0
0
200
400
600
800
1000
1200
1400
Dis
char
ge (c
fs)
Flow (cfs)Composite Sample
Site 4 - San Jacinto River at Goetz RoadUSGS 11070365
1/18/1
7 20:0
0
1/19/1
7 04:0
0
1/19/1
7 12:0
0
1/19/1
7 20:0
0
1/20/1
7 04:0
0
1/20/1
7 12:0
0
1/20/1
7 20:0
0
1/21/1
7 04:0
0
1/21/1
7 12:0
0
1/21/1
7 20:0
0
1/22/1
7 04:0
0
0
50
100
150
200
250
300
350
400
450
500
Dis
char
ge (c
fs)
Flow (cfs)Composite Sample
Site 3 - Salt Creek at Murrieta RoadUSGS 11070465
1/19/1
7 00:0
0
1/19/1
7 08:0
0
1/19/1
7 16:0
0
1/20/1
7 00:0
0
1/20/1
7 08:0
0
1/20/1
7 16:0
0
1/21/1
7 00:0
0
1/21/1
7 08:0
0
1/21/1
7 16:0
0
1/22/1
7 00:0
0
1/22/1
7 08:0
0
0
200
400
600
800
1000
1200
1400
Dis
char
ge (c
fs)
Flow (cfs)Composite Sample
Site 30 - Canyon Lake SpillwayUSGS 11070500
Wet Event #2 January 19-22, 2017
Rainfall: 1.32 to 2.0 inches
Sites: Salt Creek, San Jacinto, and Canyon Lake
![Page 20: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/20.jpg)
2/17/1
7 00:0
0
2/17/1
7 08:0
0
2/17/1
7 16:0
0
2/18/1
7 00:0
0
2/18/1
7 08:0
0
2/18/1
7 16:0
0
2/19/1
7 00:0
0
2/19/1
7 08:0
0
2/19/1
7 16:0
0
2/20/1
7 00:0
0
2/20/1
7 08:0
0
2/20/1
7 16:0
0
0
100
200
300
400
500
Dis
char
ge (c
fs)
Flow (cfs)Composite Sample
Site 30 - Canyon Lake SpillwayUSGS 11070500
2/17/1
7 00:0
0
2/17/1
7 08:0
0
2/17/1
7 16:0
0
2/18/1
7 00:0
0
2/18/1
7 08:0
0
2/18/1
7 16:0
0
2/19/1
7 00:0
0
2/19/1
7 08:0
0
2/19/1
7 16:0
0
2/20/1
7 00:0
0
2/20/1
7 08:0
0
2/20/1
7 16:0
0
0
25
50
75
100
125
150
175
Dis
char
ge (c
fs)
Flow (cfs)Composite Sample
Site 3 - Salt Creek at Murrieta RoadUSGS 11070465
2/17/1
7 00:0
0
2/17/1
7 08:0
0
2/17/1
7 16:0
0
2/18/1
7 00:0
0
2/18/1
7 08:0
0
2/18/1
7 16:0
0
2/19/1
7 00:0
0
2/19/1
7 08:0
0
2/19/1
7 16:0
0
2/20/1
7 00:0
0
2/20/1
7 08:0
0
2/20/1
7 16:0
0
0
100
200
300
400
500
600
Dis
char
ge (c
fs)
Flow (cfs)Composite Sample
Site 4 - San Jacinto River at Goetz RoadUSGS 11070365
Wet Event #3 February 17-20, 2017
Rainfall: 0.97 to 1.66 inches
Sites: Salt Creek, San Jacinto, and Canyon Lake
![Page 21: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/21.jpg)
Summary of 2008-2017 Nutrient Concentrations
Monitoring Year Site 3 - Salt Creek Site 4 - San Jacinto
River Site 30 - Canyon Lake
Spillway TN (mg/L) TP (mg/L) TN (mg/L) TP (mg/L) TN (mg/L) TP (mg/L)
2008-2009* 3.0/3.1 0.8/1.3 1.4/3.1 0.7/1.5 NS NS
2009-2010* 1.5/1.9 0.6/1.0 1.6/3.2 0.5/1.2 0.7/1.3 0.6/0.8
2010-2011* 1.5/2.2 0.4/0.5 1.4/2.2 0.7/1.9 0.9/1.5 0.5/0.9
2011-2012 1.9 0.3 2.2 0.5 NS NS
2012-2013 1.9 0.3 2.1 0.5 NS NS
2013-2014 2.7 0.9 1.8 0.6 NS NS
2014-2015 2.2 0.5 1.8 0.4 NS NS
2015-2016 2.5 0.5 2.4 1.4 NS NS
2016-2017 2.1 0.6 2.0 1.2 1.9 0.4 *Values shown for nutrient concentrations are minimum/maximum NS-Not sampled
![Page 22: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/22.jpg)
Summary of 2008-2017 Nutrient Loads
Monitoring Year
Site 3 - Salt Creek Site 4 - San Jacinto River Site 30 - Canyon Lake Spillway
Flow (Mgal) TN (kg) TP (kg) Flow (Mgal) TN (kg) TP (kg) Flow (Mgal) TN (kg) TP (kg)
2008-2009* 529 6,085/6,125 1,541/2,642 1,042 5,323/12,145 2,682/5,954 NA NS NS
2009-2010* 1,282 7,474/9,180 2,960/4,804 2,681 14,716/32,680 4,668/12,382 62 167/294 137/188
2010-2011* 1,946 5,112/7,484 1,370/1,704 3,269 7,690/12,124 4,041/10,664 1,302 2,035/3,556 1,029/2,102
2011-2012 249 1,843 238 277 2,338 542 133 NS NS
2012-2013 147 1,025 180 424 3,341 822 114 NS NS
2013-2014 411 4,268 1,409 484 3,252 1,178 148 NS NS
2014-2015 511 4,661 1,257 570 3,932 1,041 196 NS NS
2015-2016 515 5,647 1,447 872 7,926 4,624 476 NS NS
2016-2017 1,596 12,366 4,026 2,802 21,651 14,403 4,850 33,759 6,637 *Values shown for nutrient loads are minimum/maximum NS-Not Sampled NA-Not Available
![Page 23: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/23.jpg)
Lake Elsinore and Canyon Lake TMDL Water Quality Monitoring Update – 2016-17 Summary
In-Lake Monitoring
![Page 24: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/24.jpg)
17
Station Locations – Lake Elsinore
![Page 25: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/25.jpg)
18
Station Locations – Canyon Lake
![Page 26: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/26.jpg)
19
Total Nitrogen – Lake Elsinore 2016-2017
![Page 27: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/27.jpg)
20
Total Nitrogen – Lake Elsinore Historic Data
![Page 28: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/28.jpg)
21
Total Phosphorus – Lake Elsinore 2016-2017
![Page 29: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/29.jpg)
22
Total Phosphorus – Lake Elsinore Historic Data
![Page 30: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/30.jpg)
23
Total Dissolved Solids– Lake Elsinore 2016-2017
Ju ly 2
0 1 6
A u g u s t 20 1 6
S e p tem
b e r 20 1 6
Oc to
b e r 20 1 6
D e c emb e r 2
0 1 6
F e b rua ry
20 1 7
A p r il 2
0 1 7
J u n e 20 1 7
1 5 0 0
2 0 0 0
2 5 0 0
3 0 0 0
3 5 0 0
4 0 0 0
4 5 0 0
TD
S (
mg
/L)
B a s in P la n O b je c tiv e
![Page 31: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/31.jpg)
24
Total Dissolved Solids– Lake Elsinore Historic Data
15 /Ju l/2
0 0 3
2 3 /Fe b /2
0 0 4
0 4 /Oc t/2
0 0 4
1 7 /Ma y /2
0 0 5
2 0 /Ja n /2
0 0 6
2 9 /Au g /2
0 0 6
2 7 /Ap r /2
0 0 7
1 6 /Ja n /2
0 0 8
1 8 /Se p /2
0 0 8
1 7 /Ju l/2
0 0 9
1 6 /Ap r /2
0 1 0
2 2 /Fe b /2
0 1 1
2 7 /Ja n /2
0 1 20
5 0 0
1 0 0 0
1 5 0 0
2 0 0 0
2 5 0 0
3 0 0 0
3 5 0 0
4 0 0 0
2 7 /Oc t/2
0 1 5
8 /Fe b /2
0 1 6
2 3 /Ju n /2
0 1 6
1 8 /Au g /2
0 1 6
5 /Oc t/2
0 1 6
2 /Fe b /2
0 1 7
2 /Ju n /2
0 1 7
D a te
To
tal
Dis
so
lve
d S
oli
ds
(m
g/L
)
N o d a ta a v a i la b le f r o m J u n e 2 0 1 2 - J u ly 2 0 1 5
B a s in P la n O b je c t iv e
![Page 32: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/32.jpg)
25
Total Nitrogen – Canyon Lake 2016-2017
![Page 33: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/33.jpg)
26
Total Nitrogen – Canyon Lake Historic Data
![Page 34: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/34.jpg)
27
Total Phosphorus – Canyon Lake 2016-2017
![Page 35: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/35.jpg)
28
Total Phosphorus – Canyon Lake Historic Data
0 .0
0 .5
1 .0
1 .5
2 .0
2 .5
0 1 /Oc t/2
0 1 3
1 8 /Fe b /2
0 1 4
2 3 /Ju l/2
0 1 4
1 1 /De c /2
0 1 4
3 1 /Ju l/2
0 1 5
2 3 /Ju n /2
0 1 6
2 /Fe b /2
0 1 7
D a te
To
tal
Ph
os
ph
oru
s (
mg
/L)
1 5 /May /2
001
07 /Aug /2
001
22 /Jan /2
002
22 /May /2
003
21 /Oc t/2
003
17 /Aug /2
007
14 /No v /2
0 07
13 /Ma r/2
0 08
30 /May /2
008
07 /Jan /2
009
21 /Aug /2
009
30 /No v /2
0 09
29 /Ma r/2
0 10
28 /Jun /2
010
10 /Sep /2
0 10
28 /Ma r/2
0 11
29 /Ju l/2
011
M a in B a s in (A v e ra g e o f C L 0 7 & C L 0 8 )
E a s t B a s in (A v e ra g e o f C L 0 9 & C L 1 0 )
28 /Ma r/2
0 05
28 /Sep /2
0 11
28 /Feb /2
0 12
18 /Jun /2
012
T M D L T a rg e t
N o d a ta a v a i la b le f r o m M a y 2 0 0 5 - J u ly 2 0 0 7 ; J u n e 2 0 1 2 -S e p t 2 0 1 3
T M D L t a r g e t o f 0 .1 m g /L is a n n u a l a v e r a g e t o b e a t t a in e d b y 2 0 2 0
![Page 36: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/36.jpg)
29
Satellite Imagery – Chlorophyll July 2016
Lake Elsinore Canyon Lake
**Data gaps in eastern arm due to high cirrus clouds
![Page 37: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/37.jpg)
30
Satellite Imagery – Chlorophyll August 2016
Lake Elsinore Canyon Lake
**Data gaps due to large floating cyanobacterial slicks
![Page 38: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/38.jpg)
31
Satellite Imagery – Chlorophyll September 2016
Lake Elsinore Canyon Lake
**Data gaps due to large floating cyanobacterial slicks
![Page 39: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/39.jpg)
32
Satellite Imagery – Chlorophyll October 2016
Lake Elsinore Canyon Lake
**Data gaps in eastern arm due to high cirrus clouds
![Page 40: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/40.jpg)
33
Satellite Imagery – Chlorophyll December 2016
Lake Elsinore Canyon Lake
**Data gaps due to large floating cyanobacterial slicks
![Page 41: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/41.jpg)
34
Satellite Imagery – Chlorophyll February 2017
Lake Elsinore Canyon Lake
**High chlorophyll-a readings in Canyon Lake due to turbidity interference
![Page 42: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/42.jpg)
35
Satellite Imagery – Turbidity after January Storms
Canyon Lake
![Page 43: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/43.jpg)
36
Satellite Imagery – Chlorophyll April 2017
Lake Elsinore Canyon Lake
![Page 44: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/44.jpg)
37
Satellite Imagery – Chlorophyll June 2017
Lake Elsinore Canyon Lake
![Page 45: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/45.jpg)
38
Lake Elsinore Chlorophyll – 2016-2017
![Page 46: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/46.jpg)
39
Lake Elsinore Chlorophyll – Integrated Historic Data
![Page 47: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/47.jpg)
40
Canyon Lake Chlorophyll – 2016-2017
![Page 48: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/48.jpg)
41
Canyon Lake Chlorophyll – Integrated Historic Data
![Page 49: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/49.jpg)
Lake Elsinore and Canyon Lake TMDL Water Quality Monitoring Update – 2016-17 Summary
Dissolved Oxygen
Monitoring
![Page 50: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/50.jpg)
43
Lake Elsinore Dissolved Oxygen – LE02 Water Column Mean vs. 1m from Bottom 2016-2017
![Page 51: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/51.jpg)
44
Lake Elsinore Dissolved Oxygen – LE02 Water Column Mean Historic Data
13 /Ap r /2
0 0 6
2 9 /Au g /2
0 0 6
1 4 /Fe b /2
0 0 7
2 0 /Ju l/2
0 0 7
1 6 /Ja n /2
0 0 8
0 9 /Ju l/2
0 0 8
3 0 /Ja n /2
0 0 9
0 4 /De c /2
0 0 9
3 0 /Ju n /2
0 1 0
2 5 /Ja n /2
0 1 1
2 5 /Au g /2
0 1 1
3 1 /Ma y /2
0 1 20
5
1 0
1 5
3 1 /Ju l/2
0 1 5
0 6 /De c /2
0 1 5
2 0 /Ap r /2
0 1 6
2 5 /Ju l/2
0 1 6
1 9 /Se p t/2
0 1 6
8 /De c /2
0 1 6
7 /Ap r /2
0 1 7
D a te
Dis
so
lve
d O
xy
ge
n (
mg
/L) L E E 2
T M D L T a rg e t
N o d a ta a v a i la b le f r o m J u n e 2 0 1 2 - J u ly 2 0 1 5
T M D L t a r g e t o f 5 m g /L is d e p t h a v e r a g e t o b e a t t a in e d b y 2 0 1 5
L a k e E ls in o re D is s o lv e d O x y g e n - D e p th A v e ra g e
![Page 52: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/52.jpg)
45
Lake Elsinore Dissolved Oxygen – LE02 1m from Bottom Historic Data
13 /Ap r /2
0 0 6
2 9 /Au g /2
0 0 6
1 4 /Fe b /2
0 0 7
2 0 /Ju l/2
0 0 7
1 6 /Ja n /2
0 0 8
0 9 /Ju l/2
0 0 8
3 0 /Ja n /2
0 0 9
0 4 /De c /2
0 0 9
3 0 /Ju n /2
0 1 0
2 5 /Ja n /2
0 1 1
2 5 /Au g /2
0 1 1
3 1 /Ma y /2
0 1 20
5
1 0
1 5
3 1 /Ju l/2
0 1 5
0 6 /De c /2
0 1 5
2 0 /Ap r /2
0 1 6
2 5 /Ju l/2
0 1 6
1 9 /Se p t/2
0 1 6
8 /De c /2
0 1 6
7 /Ap r /2
0 1 7
D a te
Dis
so
lve
d O
xy
ge
n (
mg
/L) L E E 2
T M D L T a rg e t
N o d a ta a v a i la b le f r o m J u n e 2 0 1 2 - J u ly 2 0 1 5
T M D L t a r g e t o f 5 m g /L is 1 m o f f la k e b o t to m t o b e a t t a in e d b y 2 0 2 0
L a k e E ls in o re D is s o lv e d O x y g e n - 1 m fro m B o tto m
![Page 53: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/53.jpg)
46
Canyon Lake Dissolved Oxygen – Main Basin Epilimnion vs. Hypolimnion 2016-2017
No stratification in December-February Not sampled in July 2016
Mean of Sites CL07 & CL08
![Page 54: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/54.jpg)
47
Canyon Lake Dissolved Oxygen – East Basin Epilimnion vs. Hypolimnion 2016-2017
No stratification in Sept (CL10) & Dec/Feb (both) Not sampled in July 2016
Mean of Sites CL09 & CL10
![Page 55: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/55.jpg)
48
Dissolved Oxygen – Diurnal Variability
S u r f a c e 1 2 3 4 50
2
4
6
8
1 0
1 2
1 4
D e p t h ( m )
Dis
so
lve
d O
xy
ge
n (
mg
/L)
A MP MA v e r a g e
D O O b j e c t i v e
S u r f a c e 1 2 3 4 50
2
4
6
8
1 0
1 2
1 4
D e p t h ( m )D
iss
olv
ed
Ox
yg
en
(m
g/L
)
A MP MA v e r a g e
D O O b j e c t i v e
L a k e E l s i n o r e D i s s o l v e d O x y g e n P r o f i l e - L E 0 2
D e c e m b e r 2 0 1 5 J u n e 2 0 1 6
![Page 56: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/56.jpg)
49
Lake Elsinore Dissolved Oxygen – Morning vs. Afternoon TMDL Compliance July 2015 to June 2017
Site TMDL DO Target Time of Measurement # of Events
# Events in Compliance
Percent of Events in
Compliance
LE01
2015 Water Column Mean
Morning 14 9 64%
Afternoon 13 10 77%
2020 1m from Bottom Morning 14 6 43%
Afternoon 13 5 38%
LE02
2015 Water Column Mean
Morning 14 7 50%
Afternoon 13 9 69%
2020 1m from Bottom Morning 14 7 50%
Afternoon 13 5 38%
LE03
2015 Water Column Mean
Morning 14 9 64%
Afternoon 14 10 71%
2020 1m from Bottom Morning 14 7 50%
Afternoon 14 7 50%
![Page 57: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/57.jpg)
50
Lake Elsinore Dissolved Oxygen – Morning vs. Afternoon TMDL Compliance by Season July 2015 to June 2017
Plotting mean difference in Morning vs. Afternoon DO values * = Statistically Significant Morning vs. Afternoon Note: Positive values represent periods when DO increased from morning to afternoon, negative values indicate a decrease in DO from morning to afternoon
![Page 58: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/58.jpg)
51
Canyon Lake Dissolved Oxygen – Morning vs. Afternoon TMDL Compliance July 2015 to June 2017
Site TMDL DO Target Time of Measurement # of Events
# Events in Compliance
Percent of Events in Compliance
CL07 2015 Epilimnion
Morning 11 10 91% Afternoon 9 9 100%
2020 Hypolimnion Morning 11 0 0%
Afternoon 9 0 0%
CL08 2015 Epilimnion
Morning 11 11 100% Afternoon 9 9 100%
2020 Hypolimnion Morning 11 1 9%
Afternoon 9 2 22%
CL09 2015 Epilimnion
Morning 11 11 100% Afternoon 9 9 100%
2020 Hypolimnion Morning 11 2 18%
Afternoon 9 1 11%
CL10 2015 Epilimnion
Morning 8 8 100% Afternoon 8 8 100%
2020 Hypolimnion Morning 7 3 43%
Afternoon 8 5 63%
Note: Only events shown are those when thermal stratification was present at the time of monitoring. No measurements were taken in the afternoon for October 2015 or September 2016 events.
![Page 59: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/59.jpg)
52
Canyon Lake Dissolved Oxygen – Morning vs. Afternoon TMDL Compliance by Season July 2015 to June 2017
Plotting mean difference in Morning vs. Afternoon DO values * = Statistically Significant Morning vs. Afternoon Note: Positive values represent periods when DO increased from morning to afternoon, negative values indicate a decrease in DO from morning to afternoon No difference in mean DO was observed between morning and afternoon in epilimnion or hypolimnion at Site CL07 during summer periods
![Page 60: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/60.jpg)
53
Lake Elsinore Dissolved Oxygen Do In-Lake Sondes Represent Lake-wide Conditions?
0 2 4 6 8 1 0 1 2 1 40
2
4
6
8
1 0
1 2
1 4
1 6
W a te r C o lu m n P ro f i le D O (m g /L )u s in g h a n d -h e ld m e te r s
In-L
ak
e S
on
de
DO
(m
g/L
) r 2 = 0 .9 4 3
G ra n d A v e n u e
0 2 4 6 8 1 0 1 2 1 40
2
4
6
8
1 0
1 2
W a te r C o lu m n P ro f i le D O (m g /L )u s in g h a n d -h e ld m e te r s
In-L
ak
e S
on
de
DO
(m
g/L
) r 2 = 0 .7 6 0
L a k e s h o r e
• Data points represent individual 1-m depth readings • Hand-held meter readings were taken immediately adjacent to in-lake sondes with
maximum 30-minute time difference
Hand-held Profiles vs. In-lake Sondes July 2015 to June 2017
![Page 61: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/61.jpg)
54
Lake Elsinore Dissolved Oxygen – July 2015 to June 2017 Do In-Lake Sondes Represent Lake-wide Conditions?
Hand-held meter and In-lake sonde in general agreement
Hand-held meter and In-lake sonde not in agreement
Grand Avenue Sonde
Data points represent water column means
![Page 62: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/62.jpg)
Lake Elsinore and Canyon Lake TMDL Water Quality Monitoring Update – 2016-17 Summary
Cyanobacterial Toxin
Monitoring
![Page 63: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/63.jpg)
56
Lake Elsinore Cyanotoxin Bloom Water Samples 2016-2017
7/27 /1
6
8 /1/1
6
8 /9/1
6
8 /18 /1
6
8 /29 /1
6
9 /19 /1
6
1 0 /5/1
6
1 2 /8/1
6
2 /2/1
7
4 /7/1
7
6 /2/1
7
7 /27 /1
70
1 0
2 0
3 0
4 0
5 0
1 0 0
2 0 0
3 0 0
5 0 0 0
1 0 0 0 0
1 5 0 0 0
S a m p lin g D a te
To
tal
Mic
roc
ys
tin
Co
nc
en
tra
tio
n (
ug
/L)
B o a t R a m p - S W
C e n te r L a k e - D IW
E lm G ro v e B e a c h - S W
C e n te r L a k e - S W
H u m a n H e a lth T h re sh o ld sC a u tio n = 0 .8 u g /LW a rn in g = 6 .0 u g /LD a n g e r = 2 0 u g /L
![Page 64: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/64.jpg)
57
Lake Elsinore Cyanotoxin Bloom Scum Samples 2016-2017
7 /27 /1
6
8 /1/1
6
8 /9/1
6
8 /18 /1
6
8 /29 /1
6
9 /19 /1
6
1 0 /5/1
6
1 2 /8/1
6
7 /27 /1
70
1 0 0
2 0 0
3 0 0
4 0 0
5 0 0
1 5 0 0 0
3 0 0 0 0
4 5 0 0 0
6 0 0 0 0
7 5 0 0 0
9 0 0 0 0
S a m p lin g D a te
To
tal
Mic
roc
ys
tin
Co
nc
en
tra
tio
n (
ug
/L)
B o a t R a m p - S c u mC e n te r L a k e - S c u m
H u m a n H e a lth T h re sh o ld sC a u tio n = 0 .8 u g /LW a rn in g = 6 .0 u g /LD a n g e r = 2 0 u g /L E ls in o re W e s t M a rin a - S c u m
![Page 65: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/65.jpg)
58
Satellite Imagery Cyanotoxin Indicator – July 2017
![Page 66: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/66.jpg)
59
Questions?
![Page 67: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/67.jpg)
60
Back Up Slides
![Page 68: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/68.jpg)
61
Cyanotoxin Concentrations– Lake Elsinore 2016-2017
Analytes Microcystin Concentration (ug/L)
July 27 Aug 1 Aug 9 Aug 18 Aug 29 Sept 19 Oct 5 Dec 8 Feb 2 Apr 7 Jun 2 La Laguna Boat Ramp
- Scum 26500 19450 382 26000 23425 6600 201
La Laguna Boat Ramp - Surface Water 5.36 11.6 77.5 5950 27.5 19.4 2.35 4.19
Center Lake - Depth Integrated Water 5.3 8.9 7.2 30.6 13.5 20 1.4
Center Lake - Scum 93500 3110 70 114 Center Lake - Surface
Water 161 10.6 15.3 1.59 3.87 1.2
Elm Grove Beach - Surface Water 326 163 172 10900 35 56 2.79 2.7
California CyanoHAB Trigger Levels for Human Health (ug/L)
Toxin Caution – Action Trigger Warning – Tier 1 Danger – Tier 2
Microcystin 0.8 6.0 20
![Page 69: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/69.jpg)
August 16, 2017 Lake Elsinore/Canyon Lake Task Force Meeting
Revision of the Lake Elsinore & Canyon Lake Nutrient TMDL
CDM Smith Team & Risk
Sciences
Implementation Framework
![Page 70: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/70.jpg)
Presentation Outline
• Review of completed draft TMDL elements • Consideration of concentration based allocations • Implementation framework • Supplemental project options • Schedule
![Page 71: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/71.jpg)
Completed Draft TMDL Elements
![Page 72: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/72.jpg)
TMDL Elements
• Draft chapters 1-6 submitted to Task Force
• Remaining elements for TMDL include implementation and monitoring
![Page 73: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/73.jpg)
Allocations
![Page 74: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/74.jpg)
Allocations
• 2004 TMDL – 10 year average mass
• Draft TMDL revision – Hydrology representative of reference watershed (zero
imperviousness) • Concentration-based approach to TMDL revision
– Demonstrate with lake models that natural mass based allocation is not best water quality
– Allows for managed lake condition – prevent future Lake Elsinore desiccation
![Page 75: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/75.jpg)
Concentration-Based Allocations
• Allows current runoff volumes at reference concentrations • Encourages delivery of more water volume to lakes
– Recycled water and stormwater runoff • Water quality benefit of higher lake levels, flushing, dilution
of TDS • Linkage analysis to compare
in lake response for mass and concentration based allocations
• Which allocation approach yields highest attainable use (HAU)
Preliminary results from Anderson, 2016.
![Page 76: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/76.jpg)
Concentration-Based Allocations
• Increased volume with watershed development
Lake Segment Average Reference Volume (AFY)
Average Current Volume (AFY) Ratio
Canyon Lake (Main Lake) 3,997 5,802 1.452
Canyon Lake (East Bay) 1,797 2,546 1.417
Lake Elsinore 6,903 9,087 1.316
![Page 77: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/77.jpg)
Concentration-Based Allocations
• Reference concentration from Cranston Guard Station data
• Comparable to grab samples from other mostly undeveloped sites in SJR watershed
![Page 78: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/78.jpg)
Concentration-Based Allocations
• Reference concentration versus reference mass based allocations
• Allowable TP as kg/yr
Lake Segment Reference Volume, Reference TP Concentration
Current Volume, Reference TP Concentration
Canyon Lake (Main Lake) 1,528 2,219
Canyon Lake (East Bay) 687 974
Lake Elsinore 2,640 3,475
![Page 79: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/79.jpg)
Concentration-Based Allocations
• Reference concentration versus reference mass based allocations
• Allowable TN as kg/yr
Lake Segment Reference Volume, Reference TN Concentration
Current Volume, Reference TN Concentration
Canyon Lake (Main Lake) 4,684 6,800
Canyon Lake (East Bay) 2,106 2,984
Lake Elsinore 8,090 10,650
![Page 80: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/80.jpg)
Concentration-Based Allocations
• Multi-decadal hydrologic average needed to represent Lake Elsinore inflows
• Concentration-based allocation would remove hydrology from allowable mass calculation
![Page 81: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/81.jpg)
Implementation Framework
![Page 82: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/82.jpg)
Implementation Framework
• Load reduction required = current minus allowable • Allowable is increment attributable to anthropogenic
influence – Hydrology – Nutrient concentrations
• Quantify reduction credits from ongoing implementation of existing controls
• Supplemental projects needed if existing controls do not provide required load reduction
![Page 83: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/83.jpg)
Nutrient Load Reduction Credits
• Demonstration of Load Reductions from source control, structural, and in-lake nutrient controls
![Page 84: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/84.jpg)
Existing controls
• Summary of nutrient reduction credits to each lake segment with ongoing implementation of existing controls
• Table based on 2015 deployment data
Controls TP (kg/yr) TN (kg/yr)
CL – East Bay
CL – Main Lake
Lake Elsinore
CL – East Bay
CL – Main Lake
Lake Elsinore
Source Control (street sweeping, CB cleaning) 163 414 488 543 1380 2661
Structural (WQMPs) 63 263 236 105 689 515
Agriculture CWAD (projected deployments) 166 289 1 357 639 3
In-Lake (Alum, LEAMS) 419 858 7,000 0 0 44,000
Total 811 1,824 7,725 1,005 2,708 47,179
![Page 85: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/85.jpg)
Conformance Assessment
![Page 86: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/86.jpg)
• Supplemental projects needed if existing controls do not provide required load reduction
Conformance assessment for 2015 Deployments
![Page 87: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/87.jpg)
Conformance assessment for 2015 Deployments
• Canyon Lake – East Bay • Further load reductions may not be required if response
targets achieved
Canyon Lake – East Bay TP (kg/yr) TN (kg/yr)
Mass-based Concentration-based Mass-based Concentration-based
Current External Load without BMPs 1,858 7,763
Allowable Load 687 974 2,106 2,984
Load Reduction Required 1,171 884 5,657 4,779
Load Reductions Achieved (2015) 811 1,005
Unmet Load Reductions 360 70 4,652 3,774
![Page 88: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/88.jpg)
Conformance assessment for 2015 Deployments
• Canyon Lake - Main Lake • Further load reductions may not be required if response
targets achieved
Canyon Lake – Main Lake TP (kg/yr) TN (kg/yr)
Mass-based Concentration-based Mass-based Concentration-based
Current External Load without BMPs 3,621 16,959
Allowable Load 1,528 2,219 4,684 6,800
Load Reduction Required 2,093 1,402 12,275 10,159
Load Reductions Achieved (2015) 1,824 2,708
Unmet Load Reductions 269 -422 9,567 7,451
![Page 89: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/89.jpg)
Conformance assessment for 2015 Deployments
• Lake Elsinore quantitative conformance assessment is still being developed
• Internal load accounts for majority of nutrients in water column
• Reducing external loads to reference levels requires much less credits than estimated to be achieved from ongoing in-lake controls
![Page 90: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/90.jpg)
Supplemental Project Concepts
![Page 91: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/91.jpg)
Alternatives Analysis
• Numerous prior broad scale alternatives analysis – CDM, 2013. CNRP and AgNMP – Risk Sciences, 2007. In-Lake Nutrient Reduction Plans – CH2MHILL, 2004. Lake Elsinore Nutrient Removal Study – Tetra Tech, 2004. San Jacinto Nutrient Management Plan – Horne, 2002. Restoration of Canyon Lake and Benefits to Lake Elsinore – Black and Veatch, 1994. Lake Elsinore Water Quality Management Plan
• TMDL revision summarize findings of prior analyses and characterize options
• Different controls for Canyon Lake and Lake Elsinore • Numerous project specific studies
– Alum, aeration, HOS, recycled water, dredging, levee, fishery management, well augmentation, etc.
![Page 92: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/92.jpg)
Water Quality Strategies
• General categories – Nutrient reduction – Algae control – Oxygenation – Hydrologic Flushing
• Projects use one or more water quality strategies • Quantification of benefits with lake models
![Page 93: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/93.jpg)
EVMWD Effluent Polishing
• Reduce EVMWD effluent to 0.1 mg/L with additional chemical addition
• Currently permit for ~0.5 mg/L for 6000 AFY • Achieving ~0.35 mg/L • Increment below reference level is credit in concentration
based approach • Increase P reduction by ~1500 kg/yr
![Page 94: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/94.jpg)
Alum in Lake Elsinore
• Already done for recycled water • Via surface spreading or with inflows • Ideally to be applied when pH is low • Grand Lake St Mary’s – Ohio largest inland lake
– Alum treatment over entire 12,680 acre lake surface – ~50 percent reduction in TP lakewide
• Treatment in San Jacinto River
![Page 95: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/95.jpg)
Back Bay Wetlands
• Prior study involved routing of wet weather inflow through Back Bay wetland area
• Recirculation alternative to have continuous treatment of Lake Elsinore
![Page 96: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/96.jpg)
Alum Treatment of Canyon Lake Inflows
• Continuous alum treatment of lake inflows • More efficient flocculation with lower pH • Eliminates timing decisions of winter/spring surface spreading • Treated runoff may overflow to Lake Elsinore • Prior concept level design
• 5,000 gallon storage tank w/secondary spill containment • 15 gpm dual feed flow paced pumps w/telemetry • 1,000 ft 2” PVC feed pipe w/ anchors • Submerged downward emitter(s) w/screening • Order of magnitude capital cost - $100,000/station • Alum chemical cost and O&M
![Page 97: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/97.jpg)
Hypolimnetic Oxygenation System
• Oxygenate Canyon Lake bottom waters
• Improves DO • Reduce internal nutrient loads
by ~70% phosphorus and 35% ammonia-N
• Limited benefit to East Bay
![Page 98: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/98.jpg)
Dredging
• Remove sediment and source of internal nutrient load • Cost prohibitive for a large treatment area • Restores storage capacity filled in from decades of
sedimentation – Canyon Lake sedimentation has reduced storage capacity from
13,000 AF to 8,000 AF • Dry dredging in East Bay more efficient and cost effective
![Page 99: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/99.jpg)
Indirect Potable Reuse
• Would add treated wastewater effluent near inflows of Canyon Lake to allow increased diversion at the existing intake by EVMWD
• Mutual water quality benefits – Enhanced flushing – Deeper water depths – Dilution of nutrients with AWT water
• Review Feasibility Study recommendations
![Page 100: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/100.jpg)
Artificial Circulation in Canyon Lake
• Larger conveyance system • SWP/Colorado River water • IPR discharge • Prior concept level design
– Flow capacity: 8,000 gpm (or 11.5 mgd) – 16,350-ft, 30-inch pipeline – 400 HP Pump Station – Riser Intake with mechanical sluice
gates – Riser Outfall – Rock protection at Intake/Outfall areas
and over submerged pipe within lake
![Page 101: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/101.jpg)
Biomanipulation
• Introduce fish species or zooplankton that feed on most problematic algae
• Fishery Management Plan • Must account for TDS in update to FMP
![Page 102: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/102.jpg)
Vegetation Management
• Active vegetation management • Macrophyte along shoreline • Lake level stabilization • Floating islands
![Page 103: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/103.jpg)
Ultrasonic Algae Control
Uses ultrasonic waves to destroy algae cells
Low ongoing operational cost, after initial capital cost
Requires continuous operation to prevent growth
Limited treatment area Potential for release of toxins
into water column from dead algae cells
Further study needed to assess impacts to non-target organisms
35
Sources: SonicSolutions and Wagner, 2004.
![Page 104: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/104.jpg)
Algaecide
Use of copper sulfate or hydrogen peroxide to temporarily reduce algae
Improves effectiveness of other nutrient reduction strategies
36
![Page 105: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/105.jpg)
Physical Harvesting
Reduce algae in lake Removes nutrients and toxins in algae from system
37
![Page 106: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/106.jpg)
San Jacinto River Gap
• Significant increase in annual average runoff volume
• Incentive upstream communities currently benefiting from Mystic Lake retention
Source: Tetra Tech, 2007. San Jacinto Gap Feasibility Study.
![Page 107: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/107.jpg)
Diversion/Retention of Runoff
• Increased watershed runoff retention • Bypass flows in San Jacinto River to Temescal Creek • Effectively eliminate nutrient load, but also source of most
water to Lake Elsinore • Water rights considerations
![Page 108: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/108.jpg)
Allowing Lakebed Desiccation
Allow for natural reset mechanism
40
![Page 109: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/109.jpg)
Other Ideas?
41
![Page 110: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/110.jpg)
Next Steps
![Page 111: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/111.jpg)
TMDL Implementation Chapter
Characterization of water quality strategies Estimation of water quality benefits with lake models Provides basis for updating CNRP and AgNMP Does not rank or recommend specific projects
![Page 112: EPA’s Draft Aluminum Criteria...EPA’s Draft Aluminum Criteria Published: July 28, 2017 . Comments Due: Sept. 20, 2017](https://reader034.fdocuments.net/reader034/viewer/2022051804/5ff1bd676b187623d42b6917/html5/thumbnails/112.jpg)
Schedule
Implementation chapter draft – October 15 Monitoring chapter draft – November 1