Slope position

Month

September

December

March

June

Bottom slope

Number of samples

6

6

6

6

Free E. coli

0

2

3

0

Contaminated samples with E. coli

6

4

3

6

% polluted

100%

67%

50%

100%

Mid slope

Number of samples

8

8

8

8

Free E. coli

1

5

7

0

Contaminated samples with E. coli

7

3

1

8

% polluted

88%

38%

13%

100%

Upper slope

Number of samples

5

5

5

5

Free E. coli

1

4

5

1

Contaminated samples with E. coli

4

1

0

4

% polluted

80%

20%

0%

80%