Monitor Well No. MH-15W
On east side of center of Phelps Dodge tailings pond
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 |
2/26/98 |
64 ± 9 |
18 ± 24 |
0.2 ± 0.4 |
0.2 ± 1.1 |
0.061 |
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6/22/98 |
60 ± 5 |
11 ± 24 |
0.069 |
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9/28/98 |
68 ± 8 |
22 ± 25 |
.006 ± 0.1 |
0.065 |
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12/04/98 |
72 ± 20 |
25 ± 26 |
0.061 |
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3/09/99 |
53 ± 17 |
20 ± 11 |
0.0483 |
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4/15/99 |
43 ± 9.8 |
25 ± 6 |
0.0243 |
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6/10/99 |
29 ± 14 |
23 ± 11 |
0.0508 |
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10/11/99 |
52 ± 25 |
8.6 ± 12 |
0.06 |
||||||
4/11/00 |
60 ± 20 |
16 ± 13 |
0.0535 |
||||||
7/5/00 |
66 ± 22 |
8.9 ± 12 |
0.0561 |
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10/9/00 |
55 ± 18 |
99 ±12 |
0.72 |
||||||
4/02/01 |
130 ± 70 |
88 ± 61 |
0.0444 |
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2/19/02 |
61.2 ± 20 |
24.8 ± 10 |
31.2 |
1.05 ± 0.96 |
20.8 ± 2.8 |
0.0532 |
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4/15/02 |
34 ± 15 |
25.2 ± 13 |
0.17 ± 0.2 |
0.76 ± 0.7 |
28.1 ± 3.4 |
1.58 ± 1.1 |
17.3 ± 2.8 |
0.0541 |
|
9/13/02 |
51.6 |
27.9 |
24.3 |
0.32 |
17.4 |
0.0492 |
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11/14/02 |
25.7 |
35.4 |
23.9 |
0.26 |
18.1 |
0.0455 |
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1/24/03 |
20.2 |
18.2 |
23.3 |
1.25 |
16.1 |
0.0474 |
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4/22/03 |
73.5 |
50.1 |
27 |
0.6 |
21.5 |
0.0478 |
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8/11/03 |
54.5 ± 2.4 |
37.1 ± 2.7 |
ND |
ND |
671 ± 66.6 |
26.3 ± 2.3 |
1.0 ± 0.4 |
16.8 ± 1.8 |
0.0565 |
11/27/03 |
55.2 ± 2.6 |
55.3 ± 8.2 |
ND |
ND |
760 ± 68.0 |
24.8 ± 2.0 |
0.6 ± 0.3 |
17.7 ± 1.7 |
0.0708 |
3/11/04 |
55.3 ± 3.7 |
9.3 ± 7.6 |
ND |
ND |
780 ± 79.0 |
27.8 ± 2.6 |
0.6 ± 0.4 |
19.3 ± 2.2 |
0.0602 |
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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 |
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* No standard set for Radon
** 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].