Monitor Well No. BW-3

On-site: South of milling area near Duval Canal

Date

Gross

Alpha

pc/l

Gross

Beta

pc/l

Radium

226

pc/l

Radium

228

pc/l

Radon*

222

pc/l

Uranium

234

pc/l

Uranium

235

pc/l

Uranium

238

pc/l

Total

Uranium

mg/l

2/27/98

134 ± 13

56 ± 25

0.9 ± 0.6

3.1 ± 1.2

       

0.14

6/19/98

109 ± 7

23 ± 25

           

0.14

9/24/98

97 ± 10

25 ± 24

1.6 ± .36

3.7 ± 0.7

       

0.14

12/7/98

87 ± 8

48 ± 24

           

0.14

3/10/99

70 ± 21

56 ± 13

           

0.14

6/14/99

40 ± 20

7.4 ± 13

           

0.0569

4/5/00

110 ± 34

50 ± 18

           

0.131

7/3/00

140 ± 35

49 ± 18

           

0.123

11/8/00

44 ± 20

16 ± 13

           

0.0398

7/11/01

21.2 ± 15

49.2 ± 18

           

0.143

10/16/01

80.1 ± 23

42.7 ± 16

     

31.1 ± 2.1

1.29 ± .87

24.6 ±  2.1

0.116

2/14/02

34.6 ± 18

34.6 ± 12

     

36.2 ± 3.9

0.86 ± 0.96

39 ± 4.1

0.132

4/10/02

25.5 ± 16

26.9 ± 13

1.78 ± 0.3

2.82 ± 0.8

 

12.1 ± 2.3

1.75 ± 1.1

12.1 ± 2.4

0.0898

9/10/02

36.8

42.1

     

23.4

0.39

27.3

0.0799

11/13/02

<6.68

52.2

     

<1.78

0.1

1.18

<0.0003

1/22/03

61

52.2

     

43.2

1.13

44.2

0.174

4/15/03

24.9

29.9

     

23.7

0.45

25.2

0.0735

8/11/03

69.9 ± 3.8

51.5 ± 4.0

2.2 ± 0.5

ND

4,280 ±101

22.4 ± 2.4

1.3 ± 0.6

22.3 ± 1.5

0.0878

11/12/03

98.6 ± 4.5

33.9 ±12.5

2.3 ± 0.7

ND

15,600±140

36.9 ± 3.0

1.6 ± 0.6

35.6 ± 2.9

0.145

3/22/04

20.2 ± 5.3

24.1 ± 2.0

1.4 ± 0.4

1.7 ± 1.0

5,140± 95.5

7.9 ± 1.4

0.2 ± 0.2

8.9 ± 1.4

0.0306

MCLG**

0

0

Ra-226+ -228 = 0

None

None

None

None

0

MCL***

15 pCi/l

4 mrem/yr

Ra-226+ -228 = 5

None

None

None

None

0.03 mg/l

*   Radon has no standard.

** Maximum Contaminant Level Goal, 40 C.F.R. § 141.55.

***Maximum Contaminant Levels, 40 C.F.R. § 141.66(b) [for Ra-226+-228]; (c) [for gross alpha activity]; (d) [for beta particle and [photon radioactivity]; and (e) [for uranium].