figure 1. san gabriel river watershed impaired reaches · 2017-12-07 · figure 13.c. estimated...
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Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 1. San Gabriel River Watershed Impaired Reaches
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 2. Land Use Distribution in the San Gabriel River Watershed
Stream ReachSan Gabriel River Watershed
Land Use Categories Agriculture Commercial Extraction Industrial Low Density Residential Medium to High Density Residential Open Space & Recreation Public Facilities & Institutions Rural Density Residential Transportation & Utilities Under Construction Vacant Water & Floodways
N
5 0 5 10 Miles
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 3. Flow Gauge Stations the San Gabriel River watershed
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 4. Flows at USGS Station 11085000 in San Gabriel River Reach 3 (1990-2005)
18000
16000
14000
12000
Flow
(cfs
)
10000 50th percentile = 69 cfs
8000 90th percentile = 260 cfs
6000
4000
2000
00 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Percent Rank
Figure 5. Flows at LACDPW Station F354-R in Coyote Creek (1990-2005)
10000
9000
8000
7000
Flow
(cfs
) 6000
5000
4000
3000
2000
1000
0
50th percentile = 19 cfs
90th percentile = 156 cfs
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Percent Rank
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 6. Total vs. Dissolved Lead in San Gabriel River Storm Water (LADPW, 1997-2005)
45
40
35
y = 0.71x 30
25
0 10 20 30 40 50 60
Total Pb concentrations (ug/L)
Dis
solv
ed C
u co
ncen
trat
ions
(ug/
L)D
isso
lved
Pb
conc
entr
atio
ns (u
g/L)
NDs not used in Regression
CTR default ACF (hardness = 175 mg/L as CaCO3)
20
Total vs dissolved Pb 15 y = 0.39x R2 = 0.28
10
5
0
Figure 7. Total vs. Dissolved Copper in Coyote Creek Storm Water (LADPW, 1997-2005)
150
125
100
y = 0.96x
y = 0.53x R2 = 0.62
0 25 50 75 100 125 150
Total Cu concentrations (ug/L)
NDs not used in Regression CTR default ACF Total vs dissolved Cu
75
50
25
0
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Dis
solv
ed Z
n co
ncen
trat
ions
(ug/
L)D
isso
lved
Pb
conc
entr
atio
ns (u
g/L)
Figure 8. Total vs. Dissolved Lead in Coyote Creek Storm Water (LADPW 1997-2005)
150
125
100
y = 0.78x
y = 0.64x R2 = 0.99
0 25 50 75 100 125 150
Total Pb concentrations (ug/L)
NDs not used in Regression
75 CTR default ACF (hardness = 105 mg/L as CaCO3) Total vs dissolved Pb
50
25
0
Figure 9. Total vs. Dissolved Zinc in Coyote Creek Storm Water(LADPW, 1997-2005)
900
800
700
600
500
400
300
200
100
0
y = 0.978x
y = 0.78x R2 = 0.73
0 100 200 300 400 500 600 700 800 900
Total Zn concentrations (ug/L)
NDs not used in regression CTR default ACF Total vs dissolved Zn
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 10. Subwatershed Delineation for the San Gabriel River Watershed
2 0 2 4 6 8 10 Miles
N
Reaches Spreading grounds & drains Waterbodies
Artificial channels Artificial path Canal/ditch Connector Pipeline
Watershed
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 11. San Gabriel River Estuary Cross-sections and Channel Plan
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 12. Municipalities Located in the San Gabriel River Watershed
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 13.a. Estimated Lead Reductions to Meet Wet-Weather Grouped Storm Water Waste Load Allocations for San Gabriel River Reach 2 and Upstream Reaches and Tributaries.
100
1,000
10,000
100,000
1,000,000
10,000,000
100,000,000
9.E+0
7
1.E+0
9
2.E+0
9
3.E+0
9
4.E+0
9
5.E+0
9
6.E+0
9
7.E+0
9
9.E+09
1.E+1
0
1.E+1
0
2.E+1
0
3.E+1
0
7.E+1
0
Storm Volume (liters)
Sto
rm L
oad
(gra
ms)
Load Reduction Wasteload Allocation Load Capacity
Computed Load Indicators: Value Units Total Storms Over 12-Year Period 262 none Total Below Load Capacity Curve: 485,461 kg Existing Condition (Red and Blue) 34,453 kg Existing Load Below Load Capacity Curve (Blue): 34,453 kg Existing Load Above Load Capacity Curve (Red): 0 kg TMDL Wasteload Reduction: 0.0% none
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 13b. Estimated Copper Reductions to Meet Wet-Weather Grouped Storm Water Waste Load Allocations for Coyote Creek and Tributaries.
100
1,000
10,000
100,000
1,000,000
10,000,000
100,000,000
7.E+0
5
7.E+0
7
1.E+0
8
4.E+0
8
6.E+0
8
8.E+0
8
1.E+0
9
1.E+0
9
2.E+0
9
2.E+0
9
4.E+0
9
5.E+0
9
6.E+0
9
1.E+1
0
2.E+1
0
Storm Volume (liters)
Sto
rm L
oad
(gra
ms)
Load Reduction Wasteload Allocation Load Capacity
Computed Load Indicators: Value Units Total Storms Over 12-Year Period 283 none Total Below Load Capacity Curve: 14,173 kg Existing Condition (Red and Blue) 58,304 kg Existing Load Below Load Capacity Curve (Blue): 13,159 kg Existing Load Above Load Capacity Curve (Red): 45,145 kg TMDL Wasteload Reduction: 77.4% none
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 13.c. Estimated Lead Reductions to Meet Wet-Weather Grouped Storm Water Waste Load Allocations for Coyote Creek and Tributaries.
100
1,000
10,000
100,000
1,000,000
10,000,000
7.E+0
5
7.E+0
7
1.E+0
8
4.E+0
8
6.E+0
8
8.E+0
8
1.E+0
9
1.E+0
9
2.E+0
9
2.E+0
9
4.E+0
9
5.E+0
9
6.E+0
9
1.E+1
0
2.E+1
0
Storm Volume (liters)
Sto
rm L
oad
(gra
ms)
Load Reduction Wasteload Allocation Load Capacity
Computed Load Indicators: Value Units Total Storms Over 12-Year Period 283 none Total Below Load Capacity Curve: 84,729 kg Existing Condition (Red and Blue) 33,879 kg Existing Load Below Load Capacity Curve (Blue): 28,464 kg Existing Load Above Load Capacity Curve (Red): 5,415 kg TMDL Wasteload Reduction: 16.0% none
Total Maximum Daily Loads for Metals and Selenium San Gabriel River and Impaired Tributaries
Figure 13.d. Estimated Zinc Reductions to Meet Wet-Weather Grouped Storm Water Waste Load Allocations for Coyote Creek and Tributaries.
100
1,000
10,000
100,000
1,000,000
10,000,000
100,000,000
1,000,000,000
7.E+0
5
7.E+0
7
1.E+0
8
4.E+08
6.E+0
8
8.E+0
8
1.E+0
9
1.E+0
9
2.E+0
9
2.E+0
9
4.E+0
9
5.E+0
9
6.E+0
9
1.E+1
0
2.E+1
0
Storm Volume (liters)
Sto
rm L
oad
(gra
ms)
Load Reduction Wasteload Allocation Load Capacity
Computed Load Indicators: Value Units Total Storms Over 12-Year Period 283 none Total Below Load Capacity Curve: 120,991 kg Existing Condition (Red and Blue) 440,298 kg Existing Load Below Load Capacity Curve (Blue): 112,130 kg Existing Load Above Load Capacity Curve (Red): 328,168 kg TMDL Wasteload Reduction: 74.5% none