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Case 2: Post-Fire Putah Creek WQ Monitoring Alex Rabidoux, PE Solano County Water Agency

Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

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Page 1: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Case 2: Post-Fire Putah Creek WQ Monitoring

Alex Rabidoux, PESolano County Water Agency

Page 2: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Location

San Francisco

Sacramento

Vacaville

Middletown

Cobb

Page 3: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Cobb

Middletown

Page 4: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Wildfires in 2015

Fire Area (acres)

Wragg Fire (Solano) 8,000

Rocky Fire (Lake) 70,000

Jerusalem Fire (Lake) 25,000

Valley Fire (Napa-Lake)- 1,955 Structures- 1,281 Homes- 4th Most-Destructive Fire

76,000

Total = 180,000 acres (333 mi2)(10 x Lake Berryessa)

Page 5: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Post-Fire WQ Monitoring• Water Quality concerns to Lake, Napa, and Solano Counties• Lake Berryessa provides huge dilution but...“Godzilla El Nino”• Partnered with Hidden Valley Lake CSD & Napa County for WQ monitoring

Page 6: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Sample Locations

Middletown

Name Description

SHC St Helena Ck (Control)

CYC Coyote Ck (Partial, Small Trib)

UPC Putah Ck (Upper, Sig Burn Impact)

LBRID Putah Ck (Middle, U/S L. Berryessa)

Page 7: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Sample Locations

Winters

Name Description

PC@MD Putah Ck (Lower D/S L. Berryessa)

COC Cold Canyon Ck (U/S of Putah Ck)

LS@PDD Lake Solano @ Div Dam (Intake)

*Most significant post-fire WQ impacts

Page 8: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Constituents

Title 22 (Mineral, Physical, Inorganics) + TOC/DOC + NutrientsTier I (All Samples)

Polycyclic Aromatic Hydrocarbons (PAHs) Tier II (All except Coyote Ck)

Trihalomethane Formation Potential (TTHMFP)Tier III (Interdam Reach only)

Page 9: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

1

2

3

4

5

6

7

8

9

10

11

120

1,000

2,000

3,000

4,000

Dec-15 Jan-16 Feb-16 Mar-16 Apr-16

Rain

(in)

Stre

am F

low

(cfs

)

Upper Putah Creek - Rain & Runoff

Precip

Flow (Daily Avg)

1/6

3/7

3/11

Page 10: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

1

2

3

4

5

6

7

8

9

10

11

120

250

500

750

1,000

Dec-15 Jan-16 Feb-16 Mar-16 Apr-16

Rain

(in)

Stre

am F

low

(cfs

)

Lower Putah Creek - Rain & Runoff

Precip

Flow (Daily Avg)

1/6 3/7 3/11

Page 11: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

ResultsWhat did we see?• Cold Canyon Creek (Interdam Reach) had the worst WQ• No significant WQ degradation in Upper Putah Creek• Upper Putah Creek has excellent WQ!• Godzilla El Nino Average Water Year for Putah Creek

Page 12: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Physical Properties

Page 13: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

100

200

300

400

1/6 3/7 3/11

Specific Conductance (uS/cm)

St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

Page 14: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

50

100

150

200

1/6 3/7 3/11

Alkalinity (mg/L)

St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

Page 15: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Organics

Page 16: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

5

10

15

20

25

1/6 3/7 3/11

Total Organic Carbon (mg/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

Page 17: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

2

4

6

8

10

1/6 3/7 3/11

Dissolved Organic Carbon (mg/L)St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

Page 18: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

200

400

600

800

1000

1/6 3/7 3/11

TTHMFP (ug/L) Putah Ck @ M_Dam

Cold Canyon Ck

Putah Ck @ Div Dam

MCL = 80 ug/L

Page 19: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Sediment

Page 20: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

200

400

600

800

1,000

1/6 3/7 3/11

Total Suspended Solids (mg/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

8,300

Page 21: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

200

400

600

800

1,000

1/6 3/7 3/11

Total Dissolved Solids (mg/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

Page 22: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

100

200

300

400

500

1/6 3/7 3/11

Turbidity (NTU) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

2,000

Page 23: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

100

200

300

1/6 3/7 3/11

Color (C.U.) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

Secondary MCL = 15 C.U.

3,000

Page 24: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Nutrients

Page 25: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

1

2

3

4

5

6

1/6 3/7 3/11

Total Nitrogen (mg/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

Page 26: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

2

4

6

8

1/6 3/7 3/11

Phosphorus (mg/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

Page 27: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

0.1

0.2

0.3

0.4

0.5

1/6 3/7 3/11

Ortho Phosphate (mg/L)

St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

Page 28: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Minerals & Metals

Page 29: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

10

20

30

1/6 3/7 3/11

Arsenic (ug/L)St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

MCL = 10 ug/L

Page 30: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

20

40

60

80

100

120

1/6 3/7 3/11

Total Chromium (ug/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

MCL = 50 ug/L

Note: For surface water, Cr(III) is most prevalent form.

Page 31: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

1

2

3

4

1/6 3/7 3/11

Barium (mg/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

MCL = 1 mg/L

Page 32: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0.0

0.2

0.4

0.6

0.8

1.0

1/6 3/7 3/11

Mercury (ug/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

DL = 0.06 ug/L

RL = 0.20 ug/L

MCL = 2 ug/L

Page 33: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

5

10

15

20

1/6 3/7 3/11

Aluminum (mg/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

MCL = 1 mg/L

65

Note: High levels from sediment. (Most abundant metal in earth’s crust)

Page 34: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0

10

20

30

40

1/6 3/7 3/11

Iron (mg/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

69

Secondary MCL = 0.3 mg/L

Note: High levels from sediment. (2nd most abundant metal in earth’s crust)

Page 35: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

0.0

0.2

0.4

0.6

0.8

1.0

1/6 3/7 3/11

Manganese (mg/L) St Helena CkCoyote CkUpp Putah CkPutah Ck @ LBRIDPutah Ck @ M_DamCold Canyon CkPutah Ck @ Div Dam

Secondary MCL = .05 mg/L

11

Page 36: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

Conclusion• Cold Canyon Creek (Interdam Reach) had the worst WQ• Primarily in suspended sediment [TSS = 8,300 mg/L; TDS = 270 mg/L]• No significant WQ degradation in Upper Putah Creek• Upper Putah Creek has excellent WQ!

Page 37: Post-Fire Monitoring: Putah Creek Watershed...1/6 3/7 3/11. Aluminum (mg/L) St Helena Ck Coyote Ck Upp Putah Ck Putah Ck @ LBRID Putah Ck @ M_Dam Cold Canyon Ck Putah Ck @ Div Dam

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