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].