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The Sheepscot River Turbidity Pilot Study, - page 7 / 12

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Table 3.  DEP water sampling results from before and after a storm which occurred on June 8-9, 2006.  The West Branch (WB) and Sheepscot River (SR) sites are listed from upstream to downstream locations within their watersheds.  Water clarity was either observed, or measured in a 120 cm turbidity tube.  The maximum reading is 120 cm.

Watershed

TN

TP

Turb

Clarity

mg/L

ug/L

NTU

cm

WB

Windsor Station

6/7/2006

0.43

20

clear

WB

Howe Road

6/7/2006

0.44

21

clear

SR

Kings Mills

6/7/2006

0.41

19

clear

Watershed

TN

TP

Turb

Clarity

mg/L

ug/L

NTU

cm

WB

Prescott P Br

6/9/2006

0.29

12

0.5

clear

WB

Palermo

6/9/2006

0.28

13

0.4

clear

WB

Weeks Mills

6/9/2006

0.36

23

0.9

clear

WB

Choat Brook

6/9/2006

0.39

15

0.5

clear

WB

Windsor Station

6/9/2006

0.42

33

3.9

68

WB

Howe Rd

6/9/2006

0.46

45

6.2

53

SR

Up Hostile Valley

6/9/2006

0.28

14

0.8

>120

SR

Rt 105 bridge

6/9/2006

0.24

10

0.4

clear

SR

Coopers Mills

6/9/2006

0.32

14

0.5

clear

SR

Kings Mills

6/9/2006

0.41

30

4

63

SR

Alna

6/9/2006

0.4

33

4.4

60

Watershed

TN

TP

Turb

Clarity

mg/L

ug/L

NTU

cm

WB

Windsor Station

6/14/2006

0.39

20

1.8

>120

WB

Howe Road

6/14/2006

0.39

29

3

92

SR

Kings Mills

6/14/2006

0.33

20

1.8

>120

A comparison of the “before” and “after’ dates (6/7/06 and 6/14/06, respectively) confirm that TP and water clarity had recovered by June 14, in spite of continued high discharge (Figure 2).  The turbidity events occurred primarily in the lower West Branch and mainstem on the rising river stage and cleared soon after it peaked.  No samples were taken after June 14, because the turbidity event was over.  Windsor Station, the Howe Rd and Kings Mills were sampled on all three dates.  TN essentially changed very little at these three sites during the changes in river flow.  Small changes are evident as TN increased slightly at two sites and was slightly diluted at Kings Mills during the highest discharge and all three stations were more dilute soon after the peak passed.  The amplitude of the phosphorus changes was greater.  Total P increased on the rising stage and mostly recovered soon after the river peaked, except at the Howe Road where the recovery is only partial.  The turbidity levels during peak flow were mild in comparison

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