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Post-Fire Monitoring Update and Preliminary Results
LECL TMDL Task Force Meeting February 21, 2019
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Post-Fire Monitoring Update and Preliminary Results LECL TMDL Task - - PowerPoint PPT Presentation
Post-Fire Monitoring Update and Preliminary Results LECL TMDL Task - - PowerPoint PPT Presentation
Post-Fire Monitoring Update and Preliminary Results LECL TMDL Task Force Meeting February 21, 2019 1 Agenda Holy Fire 1 Sampling Design 2 StormEvents 3 4 Preliminary Results 2 Holy Fire 1 Began on August 06, 2018 Cleveland National
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Holy Fire
Began on August 06, 2018 Cleveland National Forest 22,877 acres burned
- 14% high soil burn severity
- 71% moderate burn severity
- 15% low soil burn severity
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Schwartz, J.Y., and T. Stempniewicz. 2018. Burned Area Emergency Response (BAER) Assessment: Geological Hazards. Cleveland National Forest, CA.
Potential Fire Impacts
- High debris flows in watersheds with steep
slopes and high-to-moderate soil burn severity
- Exacerbated debris flows within 1-3 years of
the fire
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Sampling Design
- Assess the potential impacts of the Holy Fire
- Not part of Permittee’s required compliance
monitoring
- Expedited process to capture ‘first flush’
- Contracting/mobilization/equipment
- Feedback from the LECL TMDL Task Force
- Followed SMC Post-Fire Water Quality
Monitoring Plan:
“Effects of Post-fire Runoff on Surface Water Quality: Development of a Southern California Regional Monitoring Program with Management Questions and Implementation Recommendations” (SCCWRP, 2009). http://ftp.sccwrp.org/pub/download/DOCUMENTS/TechnicalReports/598_SoCalRegionalFireMonitorin gPlan.pdf
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- Sample post-fire runoff from the terminal end of burned catchments
- Downstream of debris basins
- Compare the data to reference or control sites
- Assess the effects of the Holy Fire:
- Hydrologic response
- Sediment and pollutant loads
How does post-fire runoff affect contaminant flux?
What is the effect of post-fire runoff on downstream receiving waters? What are the factors that influence how long post-fire runoff effects persist?
1. 1 2. SMC Po Post-Fi Fire W e Water Q Qua uality M Monitoring ng Plan P n Priority M Mana nagem emen ent Q Que uestions ns: 3.
Sampling Design to Address Question #1
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3 Storm Events Event #1
11/29/2018 ‘First Flush’
- McVicker
- Horsethief
- Adobe Reference
Event #2
1/14/2019
- McVicker
1/17/2019
- Horsethief
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Pre-Storm
10/1/2018
Post-Storm
11/30/2018
McVicker Debris Basin-Leach Canyon
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Pre-Storm
10/1/2018
Post-Storm
11/30/2018
Horsethief Canyon
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Post-Storm
11/30/2018
Pre-Storm
01/08/2019
Leach Canyon Dam
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Pre-Storm
01/08/2019
Post-Storm
01/18/2019
Lake Elsinore
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1.
1 2.
Prel eliminar ary Anal alyte C e Concen entration
- ns
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McVicker Debris Basin Horsethief Canyon
4 8 12 16 20 24 28 32 36 40 44 48 52 56 60
mg/L
16 4.6 25 9.6 Total Phosphorus Total Nitrogen
Post-Fire Event #2 1/14/2019 and 1/17/2019
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Adobe Creek Reference McVicker Debris Basin Horsethief Canyon
4 8 12 16 20 24 28 32 36 40 44 48 52 56 60
mg/L
0.12 7.3 16 0.25 58 33 Total Phosphorus Total Nitrogen
Post-Fire Event #1 11/29/2018
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McVicker Debris Basin Horsethief Canyon
10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 100,000 110,000 120,000 130,000 140,000
mg/L
930 160 290 300 Total Hardness Total Dissolved Solids Total Suspended Solids 15,000 2,200
Post-Fire Event #2 1/14/2019 and 1/17/2019
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Adobe Creek Reference McVicker Debris Basin Horsethief Canyon
10,000 20,000 30,000 40,000 50,000 60,000 70,000 80,000 90,000 100,000 110,000 120,000 130,000 140,000
mg/L
180 16,000 770 300 1,500 830 Total Hardness Total Dissolved Solids Total Suspended Solids 130,000 6,900
Post-Fire Event #1 11/29/2018
ND(<2)
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McVicker Debris Basin Horsethief Canyon
400 800 1,200 1,600 2,000 2,400 2,800 3,200 3,600 4,000
mg/L
320 67 300 74 Total Aluminum Total Iron
Post-Fire Event #2 1/14/2019 and 1/17/2019
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Adobe Creek Reference McVicker Debris Basin Horsethief Canyon
400 800 1,200 1,600 2,000 2,400 2,800 3,200 3,600 4,000
mg/L
3400 97 0.065 3600 93 Total Aluminum Total Iron
Post-Fire Event #1 11/29/2018
ND(0.074)
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McVicker Debris Basin Horsethief Canyon
40 80 120 160 200 240 280 320 360
mg/L
0.015 0.015 Dissolved Aluminum Dissolved Iron
Post-Fire Event #2 1/14/2019 and 1/17/2019
ND (<0.037) ND (<0.037)
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McVicker Debris Basin Horsethief Canyon
40 80 120 160 200 240 280 320 360
mg/L
320 67 300 74 Total Aluminum Total Iron
Post-Fire Event #2 1/14/2019 and 1/17/2019
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McVicker Debris Basin Horsethief Canyon
25 50 75 100 125 150 175 200 225
mg/L
9.3 3.3 Total Manganese
Post-Fire Event #2 1/14/2019 and 1/17/2019
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Adobe Creek Reference McVicker Debris Basin Horsethief Canyon
25 50 75 100 125 150 175 200 225
mg/L
0.017 210 7 Total Manganese
Post-Fire Event #1 11/29/2018
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McVicker Debris Basin Horsethief Canyon
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10
mg/L
0.033 0.0017 0.45 0.024 Total Cadmium Total Copper Total Lead Total Nickel Total Zinc 0.21 0.064 0.3 0.013 1.7 0.2
Post-Fire Event #2 1/14/2019 and 1/17/2019
Adobe Creek Reference McVicker Debris Basin Horsethief Canyon
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10
mg/L
0.68 0.0038 0.0015 7.9 0.12 Total Cadmium Total Copper Total Lead Total Nickel Total Zinc 5.1 0.2 0.0019 5.7 0.045 0.0062 3.9 0.73
Post-Fire Event #1 11/29/2018
ND(0.00012) ND(0.0002)
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McVicker Debris Basin Horsethief Canyon
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
mg/L
0.0044 0.0018 Dissolved Cadmium Dissolved Copper Dissolved Lead Dissolved Nickel Dissolved Zinc 0.0024 0.0006 0.0016 0.0028
Post-Fire Event #2 1/14/2019 and 1/17/2019
ND (<0.00012) ND (<0.0002) ND (<0.00012) ND (<0.0002)
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McVicker Debris Basin Horsethief Canyon
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
mg/L
0.033 0.0017 0.45 0.024 Total Cadmium Total Copper Total Lead Total Nickel Total Zinc 0.21 0.064 0.3 0.013 1.7 0.2
Post-Fire Event #2 1/14/2019 and 1/17/2019
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How does post-fire runoff affect contaminant flux?
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1 2.
Initial Takeaways
- High concentrations of sediment, nutrients, and metals
- Significantly higher than reference data
- Concentrations lower in Event #2
- Debris basins reduced downstream impacts
Post-Fire Monitoring Report (expected May/June 2019)
- Assessment of post-fire contaminant and flux
- Pollutant concentrations
- Flow data
- Event-based sediment and pollutant loads
- Comparison with reference data
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Garth Engelhorn, CPSWQ, QISP/Tor Project Manager-Primary Point of Contact Garth.Engelhorn@altaenviron.com
THANK YOU!
David S. Renfrew, PMP, CPSWQ, QISP/Tor, QSD Director of Water Resources, Vice President David.Renfrew@altaenviron.com Rebekah Guill Stormwater Monitoring Program Manager Riverside County Flood Control and Water Conservation District rguill@RIVCO.ORG