Table 1

Average Metal Concentrations in Surface Samples (mg/kg) at Laurel Creek Test Sites.

 

 

Site

Fe

Mn

Cd

Cr

Cu

Ni

Pb

 

1992

1994

1992

1994

1992

1994

1992

1994

1992

1994

1992

1994

1992

1994

1

6938

-

1310

-

1.97

-

2.46

-

38.9

-

5.92

-

27.1

-

2

2030

4992

259

572

1.66

0.94

2.76

8.22

40.8

30.8

12.4

8.36

32.9

32.5

3

2538

3906

379

385

2.67

1.27

3.66

10.8

37.2

44.9

8.5

8.99

38.6

42.4

4

3995

6094

490

680

3.05

2.94

10.53

14.95

165

106

24.7

13.5

143

98.8

5

-

4799

-

411

-

2.13

-

10.48

-

55.9

-

11

-

74.5

6

4012

4285

442

492

1.76

2.56

6.28

10.08

37.7

41.5

14.1

10

63.3

63.9

7

4128

-

439

-

2.46

-

7.68

-

90.6

-

9.83

-

123

-

8

8473

5452

591

570

2.33

2.55

12.21

11.57

73.5

42.7

15.7

11.3

97.7

72.1

LEL*

20000

460

0.6

26

16

16

31

HPC**

25000

500

6

75

50

50

60

SEL***

40000

1100

10

110

110

75

250

* LEL - OME - Lowest Effect Level ** HPC - EPA - Heavily Polluted Category *** SEL - OME - Severe Effect Level


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Table 2

Metal Concentrations Exceeding Guidelines

 

1992

1994

above

LEL

Cu, Cd, Pb (7 of 7)*

Mn (6 of 7)

Ni (1 of 7)

Cu, Cd, Pb (6 of 6)

Mn (4 of 6)

in

EPA

HPC

Cu (2 of 7)

Mn, Pb (4 of 7)

Mn (3 of 6)

Cu (2 of 6)

Pb (1 of 6)

above

SEL

Cu (1 of 7)

none

*These metals exceed the criteria at 7 of the 7 sites tested.

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