APPENDIX 5.2.6A: AREA 2 - Manitoba Hydro...REGIONAL CUMULATIVE EFFECTS ASSESSMENT – PHASE II WATER – WATER QUALITY – APPENDIX 5.2.6A DECEMBER 2015 5.2.6A-II Figure 5.2.6A-6:

REGIONAL CUMULATIVE EFFECTS ASSESSMENT – PHASE II WATER – WATER QUALITY – APPENDIX 5.2.6A

APPENDIX 5.2.6A: AREA 2


DECEMBER 2015 5.2.6A-I

The following abbreviations were used for waterbodies

ASSN = Assean Lake

BURNT = Burntwood River near the inlet to Split Lake

DOWN = lower Nelson River Downstream of Kettle GS

HAYES = Hayes River

KETTLE = Kettle GS

LMFB = Limestone GS forebay

LNR = Lower Nelson River downstream of the Limestone GS

SPLIT = Split Lake

STL-N = Stephens Lake North

STL-S = Stephens Lake South

STL-SE = Stephens Lake Southeast

STL-SW = Stephens Lake Southwest

UPST = lower Nelson River upstream of Stephens Lake Southwest

Appendix Tables and Figures Page

Tables Table 5.2.6A-1: Inventory of water quality data for Stephens Lake and adjacent areas

incorporated into the assessment. ................................................................... 5.2.6A-1 Table 5.2.6A-2: Means of water quality indicators measured in the lower Nelson River

region under CAMP: 2008–2013. ..................................................................... 5.2.6A-2 Table 5.2.6A-3: Total and methylmercury concentrations (ng/L) in water samples collected

from lakes and reservoirs in northern Manitoba in 1989. ................................. 5.2.6A-4

Figures Figure 5.2.6A-1: Total phosphorus, total nitrogen, and chlorophyll a measured upstream of,

within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–1974 versus 2001–2013. .................................................... 5.2.6A-5

Figure 5.2.6A-2: Total phosphorus measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–2013. ............... 5.2.6A-6

Figure 5.2.6A-3: Total nitrogen measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–2013. ............................... 5.2.6A-7

Figure 5.2.6A-4: Chlorophyll a measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–2013. ............................... 5.2.6A-8

Figure 5.2.6A-5: Total phosphorus measured upstream of, within, and downstream of Stephens Lake and comparison to the Manitoba narrative nutrient guideline for lakes and reservoirs: 1972–2013. ............................................................... 5.2.6A-9


DECEMBER 2015 5.2.6A-II

Figure 5.2.6A-6: Total suspended solids, turbidity, and Secchi disk depth measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–1974 versus 2001–2013. ...................................... 5.2.6A-10

Figure 5.2.6A-7: Secchi disk depth measured upstream of, within, and downstream of Stephens Lake: 1972–2013............................................................................ 5.2.6A-11

Figure 5.2.6A-8: Total suspended solids measured upstream of, within, and downstream of Stephens Lake: 1972–2013............................................................................ 5.2.6A-12

Figure 5.2.6A-9: Turbidity measured upstream of, within, and downstream of Stephens Lake: 1972–2013. ........................................................................................... 5.2.6A-13

Figure 5.2.6A-10: Dissolved oxygen measured upstream of, within, and downstream of Stephens Lake in the open water and ice cover seasons (surface measurements): 1972–1974 versus 2001–2013. .......................................... 5.2.6A-14

Figure 5.2.6A-11: Dissolved oxygen measured upstream of, within, and downstream of Stephens Lake in the open water and ice cover seasons and comparison to Manitoba PAL objectives: 1972–1973. ........................................................... 5.2.6A-15

Figure 5.2.6A-12: Dissolved oxygen measured upstream of, within, and downstream of Stephens Lake in the open water season and comparison to Manitoba PAL objectives: 1971–2013. ................................................................................... 5.2.6A-16

Figure 5.2.6A-13: Dissolved oxygen measured upstream of, within, and downstream of Stephens Lake in the ice cover season and comparison to Manitoba PAL objectives: 1971–2013. ................................................................................... 5.2.6A-17

Figure 5.2.6A-14: pH, specific conductance, hardness, and total alkalinity measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–1974 versus 2001–2013. .................................................. 5.2.6A-18

Figure 5.2.6A-15: pH measured upstream of, within, and downstream of Stephens Lake: 1972–2013. ..................................................................................................... 5.2.6A-19

Figure 5.2.6A-16: Hardness measured upstream of, within, and downstream of Stephens Lake: 1972–2013. ........................................................................................... 5.2.6A-20

Figure 5.2.6A-17: Specific conductance measured upstream of, within, and downstream of Stephens Lake: 1972–2013............................................................................ 5.2.6A-21

Figure 5.2.6A-18: Total alkalinity measured upstream of, within, and downstream of Stephens Lake: 1972–2013. ........................................................................................... 5.2.6A-22

Figure 5.2.6A-19: Major cations measured upstream of, within, and downstream of Stephens Lake: 1972–1974 versus 2001–2013. ............................................................ 5.2.6A-23

Figure 5.2.6A-20: Calcium measured upstream of, within, and downstream of Stephens Lake: 1972–2013. ..................................................................................................... 5.2.6A-24

Figure 5.2.6A-21: Magnesium measured upstream of, within, and downstream of Stephens Lake: 1972–2013. ........................................................................................... 5.2.6A-25

Figure 5.2.6A-22: Potassium measured upstream of, within, and downstream of Stephens Lake: 1972–2013. ........................................................................................... 5.2.6A-26

Figure 5.2.6A-23: Sodium measured upstream of, within, and downstream of Stephens Lake: 1972–2013. ..................................................................................................... 5.2.6A-27


DECEMBER 2015 5.2.6A-III

Figure 5.2.6A-24: Chloride and sulphate measured upstream of, within, and downstream of Stephens Lake: 1972–1974 versus 2001–2013. ............................................ 5.2.6A-28

Figure 5.2.6A-25: Chloride measured upstream of, within, and downstream of Stephens Lake: 1972–2013. ..................................................................................................... 5.2.6A-29

Figure 5.2.6A-26: Sulphate measured upstream of, within, and downstream of Stephens Lake: 1972–2013. ........................................................................................... 5.2.6A-30

Figure 5.2.6A-27 Total mercury concentrations measured in Stephens Lake. See Table 5.2.6A-3 for concentrations measured in 1989 under FEMP. ........................ 5.2.6A-31

Figure 5.2.6A-28 Total mercury concentrations measured in the lower Nelson River area under CAMP at the lowest analytical detection limit: 2008–2013. ................. 5.2.6A-31

Figure 5.2.6A-29: Aluminum concentrations measured at sites in the lower Nelson River region during CAMP: 2008–2013. .................................................................. 5.2.6A-32

Figure 5.2.6A-30: Iron concentrations measured at sites in the lower Nelson River region during CAMP: 2008–2013. ............................................................................. 5.2.6A-32


DECEMBER 2015 5.2.6A-1

Table 5.2.6A-1: Inventory of water quality data for Stephens Lake and adjacent areas incorporated into the assessment.

Area Map Site IDs Period of Record Data Source Study

Program/Sampling Agency

Upstream of Stephens Lake Cleugh 3 1972–1973 DFO (2015) and Cleugh (1974a) LWCNRSB/DFO MEMP SPL-1 1985 (September only) 1986–1989 Green (1990) MEMP

NR-2 2001–2004, 2009 Keeyask Keeyask K-Tu-11 2009 (March only) Keeyask Keeyask UFS011 5.2.6A-1 CAMP CAMP

Stephens Lake Southwest MEMP STL-2 1986–1989 Green (1990) and MCWS (2014) MEMP STL-1 2001–2004, 2009 Keeyask Keeyask

K-Tu-12 2009 (March only) Keeyask Keeyask Stephens Lake Southeast Cleugh 4' 1972–1973, 1974 (September only), 1984 DFO (2015) and Cleugh (1974a) LWCNRSB/DFO

MEMP STL-3 1986–1989 Green (1990) and MCWS (2014) MEMP LAMP-1 1993 LAMP LAMP

KEEY STL-2 2001–2004, 2009 Keeyask Keeyask UFS016 2012 CAMP CAMP

Kettle GS forebay LWCNRSB 1972–1974 Morelli (1975) LWCNRSB MEMP Kettle GS 1986–1989 Green (1990) MEMP

LAMP-2 1990–1994 LAMP LAMP Stephens Lake North Cleugh 4 1972–73, 1974 (September only) DFO (2015) and Cleugh (1974a) LWCNRSB

MEMP STL-1 1986–1989 Green (1990) and MCWS (2014) MEMP KEEY STL-3 2004, 2009 Keeyask Keeyask

UFS015 2012 CAMP CAMP Downstream of Stephens Lake Cleugh 5 1972–1973 DFO (2015) and Cleugh (1974a) LWCNRSB

LAMP-3 1990–1994, 1996, 1999 LAMP LAMP

NR-3 2002–2004, 2006 (March only), 2009 Keeyask/Conawapa Keeyask/Conawapa

Li-S-02b 2009 (March only) Conawapa CONAWAPA



Table 5.2.6A-2: Means of water quality indicators measured in the lower Nelson River region under CAMP: 2008–2013.

Metric Units Waterbody

BURNT SPLIT STL-S STL-N LMFB LNR HAYES ASSN

Years Sampled 2009/2010–2013/2014

2009/2010–2013/2014

2009/2010, 2012/2013

2009/2010, 2012/2013

2010/2011, 2013/2014

2008/2009–2013/2014

2008/2009–2013/2014

2009/2010–2013/2014

Total Phosphorus (TP) (mg/L) 0.0354 0.0393 0.0428 0.0254 0.0378 0.0393 0.0163 0.0200 TP Trophic Status - Eutrophic Eutrophic Eutrophic Meso-

eutrophic Eutrophic Eutrophic Mesotrophic Mesotrophic

/ Meso-eutrophic

Total Nitrogen (TN) (mg/L) 0.40 0.45 0.47 0.42 0.41 0.51 0.44 0.43 TN Trophic Status - Oligotrophic Mesotrophic Mesotrophic Mesotrophic Mesotrophic Oligotrophic Oligotrophic Mesotrophic Total Kjeldahl Nitrogen (mg/L) 0.38 0.41 0.43 0.39 0.37 0.46 0.41 0.41 Chlorophyll a (µg/L) 2.08 4.30 3.70 2.22 2.90 3.57 2.07 2.13 Chlorophyll a Trophic Status - Oligotrophic Mesotrophic Mesotrophic Oligotrophic Mesotrophic Oligotrophic Oligotrophic Oligotrophic TN:TP 27 27 25 45 24 30 70 57 Dissolved Organic Carbon (mg/L) 8.4 8.4 8.2 8.7 8.5 8.2 9.6 10.0 Nitrate/nitrite (mg N/L) 0.0278 0.0393 0.0422 0.0273 0.0432 0.0501 0.0244 0.0192 Ammonia (mg N/L) 0.008 0.011 0.010 0.006 0.026 0.013 0.010 0.012 Dissolved Phosphorus (mg/L) 0.012 0.020 0.024 0.010 0.020 0.020 0.006 0.008

Dissolved Oxygen (DO) Lower than MWQSOGs for PAL

(Y/N) N Y N N N N N N

DO - open water season (surface) (mg/L) 10.26 9.16 9.46 9.95 10.55 10.66 10.91 10.70 DO - open water season (bottom) (mg/L) 10.23 9.03 9.25 9.84 10.33 10.66 10.89 10.52 DO - ice cover season (surface) (mg/L) 18.39 17.38 15.74 16.14 16.44 17.03 14.01 17.38 DO - ice cover season (bottom) (mg/L) 18.54 17.27 15.72 14.05 16.74 15.73 13.85 15.95 Thermal Stratification (Y/N) No No No No No No No Yes (winter

2011/2012, spring 2012)

Secchi Disk Depth (m) 0.33 0.42 0.47 0.90 0.99 - 1.43 0.73 Total Suspended Solids (mg/L) 26.3 12.6 11.1 4.9 10.2 14.3 12.9 8.3 Turbidity (NTU) 30.9 19.7 21.6 9.67 15.8 21.0 7.06 8.9 True Colour (TCU) 32.9 18.5 32.5 18.9 15.1 23.6 28.4 21.1

Specific Conductance (µmhos/cm) 129 302 283 260 312 294 156 235 Total Dissolved Solids (mg/L) 90.2 188 194 171 189 185 101 147



Table 5.2.6A-2: Means of water quality indicators measured in the lower Nelson River region under CAMP: 2008–2013.

Metric Units Waterbody


Hardness (mg/L) 68.5 125 122 126 121 124 87.6 134 Hardness Category - Moderately

Soft/Hard Hard Hard Hard Hard Hard Moderately

Soft/Hard Hard

pH - 8.11 8.25 8.22 8.24 8.21 8.24 8.14 8.32 Total Alkalinity (mg/L) 63.1 101 99.4 110 101 100 81.8 129 Metals > MWQSOGs for PAL - Al, Cu, Fe,

Ag Al, Fe Al, Fe Al, Fe Al, Fe Al, Fe, Se Al, Cu, Fe,

Ag Al, Cu, Fe

Aluminum (mg/L) 1.14 0.740 0.638 0.419 0.785 0.719 0.149 0.282 Iron (mg/L) 1.01 0.598 0.525 0.294 0.612 0.599 0.248 0.238 Mercury (<26 ng/L DL only) (mg/L) 11.4 1.20 <20 <20 1.86 <20 <20 <20 Mercury (1 ng/L DL only) (mg/L) 3.18 1.20 1.18 <1 1.86 <1 1.95 1.36

Calcium (mg/L) 18.1 29.7 29.2 34.0 29.0 30.2 26.5 42.0 Magnesium (mg/L) 5.62 12.2 11.9 9.87 11.9 11.8 5.18 7.10 Potassium (mg/L) 1.48 2.89 2.80 1.99 2.89 2.82 0.602 0.83 Sodium (mg/L) 3.64 17.3 17.8 11.5 16.7 16.2 1.90 2.38 Chloride (mg/L) 1.72 17.6 18.8 13.0 18.9 18.4 1.11 1.07 Sulphate (mg/L) 3.43 26.5 24.2 13.3 28.4 25.6 1.59 2.35



Table 5.2.6A-3: Total and methylmercury concentrations (ng/L) in water samples collected from lakes and reservoirs in northern Manitoba in 1989. Table modified from Ramsey (1991b).

Waterbody Habitat

Total Mercury (ng/L)

Methylmercury (ng/L)

Time-weighted

Mean Minimum Maximum

Time-weighted

Mean Minimum Maximum

Granville Lake Nearshore 1.44 0.70 1.82 0.021 0.013 0.033 Offshore 1.50 0.66 2.37 0.023 0.020 0.038

Southern Indian Lake (Methyl Bay)

Nearshore 1.18 0.71 2.37 0.034 0.028 0.045 Offshore 1.60 0.73 3.15 0.017 0.014 0.023

Notigi Lake (West Basin) 1.07 0.046

Burntwood River at Thompson 2.10 0.027 0.023 0.031

Stephens Lake Nearshore 1.77 1.07 2.70 0.037 0.027 0.044 Offshore 1.28 0.81 1.73 0.054 0.041 0.060



Figure 5.2.6A-1: Total phosphorus, total nitrogen, and chlorophyll a measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–1974 versus 2001–2013.

2001-2013

1972-1974

UPST STLSE KETTLE STLN DOWN0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)

Ultra-oligotrophic Oligotrophic

Hyper-eutrophic

Eutrophic

Meso-eutrophicMesotrophic

UPST STLSE KETTLE STLN DOWN0

2

4

6

8

10

12

14

Chl

orop

hyll

a (

µg/L

)

Eutrophic

Mesotrophic

Oligotrophic

UPST STLSW STLSE STLN DOWN0

2

4

6

8

10

12

14

Chl

orop

hyll

a (

µg/L

)

Oligotrophic

Mesotrophic

Eutrophic

UPST STLSW STLSE STLN DOWN0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Tota

l Nit

roge

n (m

g/L)

Oligotrophic

Mesotrophic

Eutrophic


0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L) Hyper-eutrophic

Ultra-oligotrophicOligotrophic


Eutrophic


0.2

0.4

0.6

0.8

1.0

1.2

1.4

Tota

l Nit

roge

n (m

g/L)

Eutrophic

Mesotrophic

Oligotrophic



Figure 5.2.6A-2: Total phosphorus measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–2013.

UPSTREAM OF STEPHENS LAKE KETTLE FOREBAY

STEPHENS LAKE SOUTHWEST STEPHENS LAKE NORTH

STEPHENS LAKE SOUTHEAST DOWNSTREAM OF STEPHENS LAKE

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)

Open-water Season Ice-cover Season

Hyper-eutrophic

Eutrophic

MesotrophicOligotrophic

Ultra-oligotrophic

Meso-eutrophic

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)


Hyper-eutrophic

Eutrophic

Ultra-oligotrophic

Meso-eutrophicMesotrophicOligotrophic

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)


MesotrophicMeso-eutrophic

Hyper-eutrophic

Oligotrophic

Eutrophic

Ultra-oligotrophic

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)Open-water Season Ice-cover Season

Hyper-eutrophic

Eutrophic

OligotrophicUltra-oligotrophic


0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)


Hyper-eutrophic

Eutrophic

Meso-eutrophicMesotrophicOligotrophic

Ultra-oligotrophic

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)


Ultra-oligotrophicOligotrophicMesotrophic

Meso-eutrophic

Eutrophic

Hyper-eutrophic



Figure 5.2.6A-3: Total nitrogen measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–2013.




0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Tota

l Nit

roge

n (m

g/L)


Oligotrophic

Mesotrophic

Eutrophic

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Tota

l Nit

roge

n (m

g/L)


Oligotrophic

Mesotrophic

Eutrophic

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Tota

l Nit

roge

n (m

g/L)


Oligotrophic

Mesotrophic

Eutrophic

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Tota

l Nit

roge

n (m

g/L)


Oligotrophic

Mesotrophic

Eutrophic

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Tota

l Nit

roge

n (m

g/L)


Oligotrophic

Mesotrophic

Eutrophic

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

Tota

l Nit

roge

n (m

g/L)


Oligotrophic

Mesotrophic

Eutrophic



Figure 5.2.6A-4: Chlorophyll a measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–2013.




0

2

4

6

8

10

12

14

16

18

20

Chl

orop

hyll

a(µ

g/L)


Oligotrophic

Mesotrophic

Eutrophic

0

2

4

6

8

10

12

14

16

18

20

Chl

orop

hyll

a(µ

g/L)


Oligotrophic

Mesotrophic

Eutrophic

0

2

4

6

8

10

12

14

16

18

20

Chl

orop

hyll

a(µ

g/L)


Oligotrophic

Mesotrophic

Eutrophic

0

2

4

6

8

10

12

14

16

18

20

Chl

orop

hyll

a(µ

g/L)


Oligotrophic

Mesotrophic

Eutrophic

0

2

4

6

8

10

12

14

16

18

20

Chl

orop

hyll

a(µ

g/L)


Oligotrophic

Mesotrophic

Eutrophic

0

2

4

6

8

10

12

14

16

18

20

Chl

orop

hyll

a(µ

g/L)


Oligotrophic

Mesotrophic

Eutrophic



Figure 5.2.6A-5: Total phosphorus measured upstream of, within, and downstream of Stephens Lake and comparison to the Manitoba narrative nutrient guideline for lakes and reservoirs: 1972–2013.




0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)


Narrative Nutrient Guideline

0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)



0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)



0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)



0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/



0.00

0.02

0.04

0.06

0.08

0.10

0.12

0.14

0.16

0.18

Tota

l Pho

spho

rus

(mg/

L)




DECEMBER 2015 5.2.6A-10

Figure 5.2.6A-6: Total suspended solids, turbidity, and Secchi disk depth measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–1974 versus 2001–2013.

1972-1974

2001-2013


5

10

15

20

25

30

35

40

45

Turb

idit

y (N

TU)


0.5

1.0

1.5

2.0

2.5

3.0

Sec

chi D

isk

Dep

th (

m)


5

10

15

20

25

30

35

Tota

l Sus

pend

ed S

olid

s (m

g/L)


5

10

15

20

25

30

35

40

45Tu

rbid

ity

(NTU

)


0.5

1.0

1.5

2.0

2.5

3.0

Sec

chi D

isk

Dep

th (

m)


5

10

15

20

25

30

35

Tota

l Sus

pend

ed S

olid

s (m

g/L)


DECEMBER 2015 5.2.6A-11

Figure 5.2.6A-7: Secchi disk depth measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0.0

0.5

1.0

1.5

2.0

2.5

3.0

Secc

hi D

isk

Dep

th (

m)

Open-water Season

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Secc

hi D

isk

Dep

th (

m)

Open-water Season

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Secc

hi D

isk

Dep

th (

m)

Open-water Season

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Secc

hi D

isk

Dep

th (

m)

Open-water Season

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Secc

hi D

isk

Dep

th (

m)

Open-water Season

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Secc

hi D

isk

Dep

th (

m)

Open-water Season


DECEMBER 2015 5.2.6A-12

Figure 5.2.6A-8: Total suspended solids measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0

10

20

30

40

50

60

70

Tota

l Sus

pend

ed S

olid

s (m

g/L)


0

10

20

30

40

50

60

70

Tota

l Sus

pend

ed S

olid

s (m

g/L)


0

10

20

30

40

50

60

70

Tota

l Sus

pend

ed S

olid

s (m

g/L)


0

10

20

30

40

50

60

70

Tota

l Sus

pend

ed S

olid

s (m

g/L)


0

10

20

30

40

50

60

70

Tota

l Sus

pend

ed S

olid

s (m

g/L)


0

10

20

30

40

50

60

70

Tota

l Sus

pend

ed S

olid

s (m

g/L)



DECEMBER 2015 5.2.6A-13

Figure 5.2.6A-9: Turbidity measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0

5

10

15

20

25

30

35

40

45

50

Turb

idit

y (N

TU)


0

5

10

15

20

25

30

35

40

45

50

Turb

idit

y (N

TU)


0

5

10

15

20

25

30

35

40

45

50

Turb

idit

y (N

TU)


0

5

10

15

20

25

30

35

40

45

50

Turb

idit

y (N

TU)


0

5

10

15

20

25

30

35

40

45

50

Turb

idit

y (N

TU)


0

5

10

15

20

25

30

35

40

45

50

Turb

idit

y (N

TU)



DECEMBER 2015 5.2.6A-14

Figure 5.2.6A-10: Dissolved oxygen measured upstream of, within, and downstream of Stephens Lake in the open water and ice cover seasons (surface measurements): 1972–1974 versus 2001–2013.

1972-1974OPEN-WATER SEASON ICE-COVER SEASON

2001-2013


2

4

6

8

10

12

14

16

18

Dis

solv

ed O

xyge

n (m

g/L)


2

4

6

8

10

12

14

16

18

Dis

solv

ed O

xyge

n (m

g/L)

UPST STLSE KETTLE STLN LONG

0

5

10

15

20

25

Dis

solv

ed O

xyge

n (m

g/L)

UPST STLSW STLSE STLN LONG0

5

10

15

20

25

Dis

solv

ed O

xyge

n (m

g/L)


DECEMBER 2015 5.2.6A-15

Figure 5.2.6A-11: Dissolved oxygen measured upstream of, within, and downstream of Stephens Lake in the open water and ice cover seasons and comparison to Manitoba PAL objectives: 1972–1973.

STEPHENS LAKE SOUTHEAST STEPHENS LAKE NORTH DOWNSTREAM OF STEPHENS LAKE

ICE-COVER SEASON

OPEN-WATER SEASONUPSTREAM OF STEPHENS LAKE

0

2

4

6

8

10

12

14

16

Jul-72 Aug-72 Aug-72 Sep-72

Dis

solv

ed O

xyge

n (m

g/L)

Surface Bottom

Cold Water: 30 Day PAL Open-water Cool Water: 7 Day PAL Open-water

0

2

4

6

8

10

12

14

16

18

Jul-72 Aug-72 Aug-72 Sep-72

Dis

solv

ed O

xyge

n (m

g/L)

Surface Bottom

Cold Water: 7 Day PAL Ice-cover Cool Water: 30 Day PAL Ice-cover

0

2

4

6

8

10

12

14

16

Jul-72 Aug-72 Aug-72 Sep-72 Jun-73 Jul-73 Aug-73 Sep-73

Dis

solv

ed O

xyge

n (m

g/L)

Surface Bottom


0

2

4

6

8

10

12

14

16

18

Dec-72 Mar-73

Dis

solv

ed O

xyge

n (m

g/L)

Surface Bottom


0

2

4

6

8

10

12

14

16

Jul-72 Aug-72 Aug-72 Sep-72 Jun-73 Jul-73 Aug-73 Sep-73

Dis

solv

ed O

xyge

n (m

g/L)

Surface Bottom


0

2

4

6

8

10

12

14

16

18

Dec-72 Mar-73

Dis

solv

ed O

xyge

n (m

g/L)

Surface Bottom


0

2

4

6

8

10

12

14

16

Jul-72 Aug-72 Aug-72 Sep-72 Sep-73

Dis

solv

ed O

xyge

n (m

g/L)

Surface Bottom


0

2

4

6

8

10

12

14

16

18

Dec-72 Mar-73

Dis

solv

ed O

xyge

n (m

g/L)

Surface Bottom



DECEMBER 2015 5.2.6A-16

Figure 5.2.6A-12: Dissolved oxygen measured upstream of, within, and downstream of Stephens Lake in the open water season and comparison to Manitoba PAL objectives: 1971–2013.




0

2

4

6

8

10

12

14

16

18

Dis

solv

ed O

xyge

n (m

g/L)

Open-water Season

PAL Objective: Cold-water Aquatic Life

PAL Objective: Cool-water Aquatic Life

0

2

4

6

8

10

12

14

16

18

Dis

solv

ed O

xyge

n (m

g/L)

Open-water Season



0

2

4

6

8

10

12

14

16

18

Dis

solv

ed O

xyge

n (m

g/L)

Open-water Season



0

2

4

6

8

10

12

14

16

18

Dis

solv

ed O

xyge

n (m

g/L)

Open-water Season



0

2

4

6

8

10

12

14

16

18

Dis

solv

ed O

xyge

n (m

g/L)

Open-water Season



0

2

4

6

8

10

12

14

16

18

Dis

solv

ed O

xyge

n (m

g/L)

Open-water Season




DECEMBER 2015 5.2.6A-17

Figure 5.2.6A-13: Dissolved oxygen measured upstream of, within, and downstream of Stephens Lake in the ice cover season and comparison to Manitoba PAL objectives: 1971–2013.




0

5

10

15

20

25

Dis

solv

ed O

xyge

n (m

g/L)

Ice-cover Season



0

5

10

15

20

25

Dis

solv

ed O

xyge

n (m

g/L)

Ice-cover Season



0

5

10

15

20

25

Dis

solv

ed O

xyge

n (m

g/L)

Ice-cover Season



0

5

10

15

20

25

Dis

solv

ed O

xyge

n (m

g/L)

Ice-cover Season



0

5

10

15

20

25

Dis

solv

ed O

xyge

n (m

g/L)

Ice-cover Season



0

5

10

15

20

25

Dis

solv

ed O

xyge

n (m

g/L)

Ice-cover Season




DECEMBER 2015 5.2.6A-18

Figure 5.2.6A-14: pH, specific conductance, hardness, and total alkalinity measured upstream of, within, and downstream of Stephens Lake and comparison to trophic boundaries: 1972–1974 versus 2001–2013.

2001-2013

1972-1974


20

40

60

80

100

120

140

Tota

l Alk

alin

ity

as C

aCO

3(m

g/L)


5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

Labo

rato

ry p

H

PAL Guideline Range


50

100

150

200

250

300

350

400

Spe

cifi

c C

ondu

ctan

ce (

µS/c

m)


20

40

60

80

100

120

140

160

Har

dnes

s as

CaC

O3

(mg/

L)

Moderately Soft/Hard

Hard

Soft

Very Soft


20

40

60

80

100

120

140

Tota

l Alk

alin

ity

as C

aCO

3(m

g/L)


50

100

150

200

250

300

350

400S

peci

fic

Con

duct

ance

(µS

/cm

)


5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

Labo

rato

ry p

H

PAL Guideline Range


20

40

60

80

100

120

140

160

Har

dnes

s as

CaC

O3

(mg/

L)

Hard


Soft

Very Soft


DECEMBER 2015 5.2.6A-19

Figure 5.2.6A-15: pH measured upstream of, within, and downstream of Stephens Lake: 1972–2013.

KETTLE FOREBAY


DOWNSTREAM OF STEPHENS LAKESTEPHENS LAKE SOUTHEAST

UPSTREAM OF STEPHENS LAKE

5.0

5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

pH


PAL Guideline Range

5.0

5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

pH


PAL Guideline Range

5.0

5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

pH


PAL Guideline Range

5.0

5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

pH


PAL Guideline Range

5.0

5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

pHOpen-water Season Ice-cover Season

PAL Guideline Range

5.0

5.5

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

pH


PAL Guideline Range


DECEMBER 2015 5.2.6A-20

Figure 5.2.6A-16: Hardness measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0

20

40

60

80

100

120

140

160

Har

dnes

s as

CaC

O3

(mg/

L)



Soft

Very Soft

Hard

0

20

40

60

80

100

120

140

160

Har

dnes

s as

CaC

O3

(mg/

L)


Hard


Soft

Very Soft

0

20

40

60

80

100

120

140

160

Har

dnes

s as

CaC

O3

(mg/

L)


Hard


Soft

Very Soft

0

20

40

60

80

100

120

140

160

Har

dnes

s as

CaC

O3

(mg/

L)


Hard


Soft

Very Soft

0

20

40

60

80

100

120

140

160

Har

dnes

s as

CaC

O3

(mg/


Hard

Soft

Very Soft


0

20

40

60

80

100

120

140

160

Har

dnes

s as

CaC

O3

(mg/

L)



Hard

Soft

Very Soft


DECEMBER 2015 5.2.6A-21

Figure 5.2.6A-17: Specific conductance measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0

50

100

150

200

250

300

350

400

Spec

ific

Con

duct

ance

(µ

S/cm

)


0

50

100

150

200

250

300

350

400

Spec

ific

Con

duct

ance

(µ

S/cm

)


0

50

100

150

200

250

300

350

400

Spec

ific

Con

duct

ance

(µ

S/cm

)


0

50

100

150

200

250

300

350

400

Spec

ific

Con

duct

ance

(µ

S/cm

)


0

50

100

150

200

250

300

350

400

Spec

ific

Con

duct

ance

(µ

S/cm

)Open-water Season Ice-cover Season

0

50

100

150

200

250

300

350

400

Spec

ific

Con

duct

ance

(µ

S/cm

)



DECEMBER 2015 5.2.6A-22

Figure 5.2.6A-18: Total alkalinity measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0

20

40

60

80

100

120

140

Tota

l Alk

alin

ity

as C

aCO

3(m

g/L)


0

20

40

60

80

100

120

140

Tota

l Alk

alin

ity

as C

aCO

3(m

g/L)


0

20

40

60

80

100

120

140

Tota

l Alk

alin

ity

as C

aCO

3(m

g/L)


0

20

40

60

80

100

120

140

Tota

l Alk

alin

ity

as C

aCO

3(m

g/L)


0

20

40

60

80

100

120

140

Tota

l Alk

alin

ity

as C

aCO

3(m

g/L)


0

20

40

60

80

100

120

140

Tota

l Alk

alin

ity

as C

aCO

3(m

g/L)



DECEMBER 2015 5.2.6A-23

Figure 5.2.6A-19: Major cations measured upstream of, within, and downstream of Stephens Lake: 1972–1974 versus 2001–2013.

2001-2013

1972-1974


5

10

15

20

25

30

35

40

45

Cal

cium

(m

g/L)


2

4

6

8

10

12

14

16

Mag

nesi

um (

mg/

L)


0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Pot

assi

um (

mg/

L)


5

10

15

20

25

30

Sod

ium

(m

g/L)


5

10

15

20

25

30

35

40

45

Cal

cium

(m

g/L)


2

4

6

8

10

12

14

16

Mag

nesi

um (

mg/

L)


0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Pot

assi

um (

mg/

L)


5

10

15

20

25

30

Sod

ium

(m

g/L)


DECEMBER 2015 5.2.6A-24

Figure 5.2.6A-20: Calcium measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0

10

20

30

40

50

60

Cal

cium

(m

g/L)


0

10

20

30

40

50

60

Cal

cium

(m

g/L)


0

10

20

30

40

50

60

Cal

cium

(m

g/L)


0

10

20

30

40

50

60

Cal

cium

(m

g/L)


0

10

20

30

40

50

60

Cal

cium

(m

g/L)


0

10

20

30

40

50

60

Cal

cium

(m

g/L)



DECEMBER 2015 5.2.6A-25

Figure 5.2.6A-21: Magnesium measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0

2

4

6

8

10

12

14

16

18

Mag

nesi

um (

mg/

L)


0

2

4

6

8

10

12

14

16

18

Mag

nesi

um (

mg/

L)


0

2

4

6

8

10

12

14

16

18

Mag

nesi

um (

mg/

L)


0

2

4

6

8

10

12

14

16

18

Mag

nesi

um (

mg/

L)


0

2

4

6

8

10

12

14

16

18

Mag

nesi

um (

mg/

L)


0

2

4

6

8

10

12

14

16

18

Mag

nesi

um (

mg/

L)



DECEMBER 2015 5.2.6A-26

Figure 5.2.6A-22: Potassium measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Pot

assi

um (

mg/

L)


0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Pot

assi

um (

mg/

L)


0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Pot

assi

um (

mg/

L)


0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Pot

assi

um (

mg/

L)


0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Pot

assi

um (

mg/

L)


0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

Pot

assi

um (

mg/

L)



DECEMBER 2015 5.2.6A-27

Figure 5.2.6A-23: Sodium measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0

5

10

15

20

25

30

Sodi

um (

mg/

L)


0

5

10

15

20

25

30

Sodi

um (

mg/

L)


0

5

10

15

20

25

30

Sodi

um (

mg/

L)


0

5

10

15

20

25

30

Sodi

um (

mg/

L)


0

5

10

15

20

25

30

Sodi

um (

mg/

L)


0

5

10

15

20

25

30

Sodi

um (

mg/

L)



DECEMBER 2015 5.2.6A-28

Figure 5.2.6A-24: Chloride and sulphate measured upstream of, within, and downstream of Stephens Lake: 1972–1974 versus 2001–2013.

2001-2013

1972-1974


5

10

15

20

25

30

Chl

orid

e (m

g/L)


5

10

15

20

25

30

35

40

Sul

phat

e (m

g/L)


5

10

15

20

25

30

Chl

orid

e (m

g/L)


5

10

15

20

25

30

35

40

45S

ulph

ate

(mg/

L)


DECEMBER 2015 5.2.6A-29

Figure 5.2.6A-25: Chloride measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0

5

10

15

20

25

30

Chl

orid

e (m

g/L)


0

5

10

15

20

25

30

Chl

orid

e (m

géL)


0

5

10

15

20

25

30

Chl

orid

e (m

g/L)


0

5

10

15

20

25

30

Chl

orid

e (m

g/L)


0

5

10

15

20

25

30

Chl

orid

e (m

g/L)


0

5

10

15

20

25

30

Chl

orid

e (m

g/L)



DECEMBER 2015 5.2.6A-30

Figure 5.2.6A-26: Sulphate measured upstream of, within, and downstream of Stephens Lake: 1972–2013.




0

5

10

15

20

25

30

35

40

45

Sulp

hate

(m

g/L)


0

5

10

15

20

25

30

35

40

45

Sulp

hate

(m

g/L)


0

5

10

15

20

25

30

35

40

45

Sulp

hate

(m

g/L)


0

5

10

15

20

25

30

35

40

45

Sulp

hate

(m

g/L)


0

5

10

15

20

25

30

35

40

45

Sulp

hate

(m

g/L)


0

5

10

15

20

25

30

35

40

45

Sulp

hate

(m

g/L)



DECEMBER 2015 5.2.6A-31

Figure 5.2.6A-27 Total mercury concentrations measured in Stephens Lake. See Table 5.2.6A-3 for concentrations measured in 1989 under FEMP.

Figure 5.2.6A-28 Total mercury concentrations measured in the lower Nelson River area under CAMP at the lowest analytical detection limit: 2008–2013.

0

100

200

300

400

500

600

700

800

900

1000

Mer

cury

(ng

/L)

PAL Guideline

0

5

10

15

20

25

30


Mer

cury

(ng

/L)

PAL Guideline


DECEMBER 2015 5.2.6A-32

Figure 5.2.6A-29: Aluminum concentrations measured at sites in the lower Nelson River region during CAMP: 2008–2013.

Figure 5.2.6A-30: Iron concentrations measured at sites in the lower Nelson River region during CAMP: 2008–2013.

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4


Alu

min

um (

mg/

L)

PAL Guideline

0.0

0.2

0.4

0.6

0.8

1.0

1.2


Iron

(m

g/L)

PAL Guideline

Documents

APPENDIX 5.2.6A: AREA 2 - Manitoba Hydro...REGIONAL CUMULATIVE EFFECTS ASSESSMENT – PHASE II WATER – WATER QUALITY – APPENDIX 5.2.6A DECEMBER 2015 5.2.6A-II Figure 5.2.6A-6: