Phelps Dodge Sierrita Mine
Monitor Well No. MH-15W
Monitor well along east side of tailing dam, approximately ¼ mile north of center of dam
Sulfates and Dissolved Metals
Date |
Hardness |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mc/l |
Molybdenum |
TDS |
Alkalinity |
pH Units |
9/27/90 |
525 |
107 |
1,800 |
2,995 |
125 |
7.6 |
|||
10/8/90 |
500 |
114 |
1,720 |
2,935 |
7.4 |
||||
7/9/91 |
480 |
102 |
1,690 |
2,856 |
7.08 |
||||
6/4/92 |
444 |
105 |
1,792 |
.01 |
.3 |
2,884 |
7.14 |
||
8/14/92 |
440 |
100 |
2,887 |
7.14 |
|||||
9/16/93 |
500 |
115 |
1,772 |
3,150 |
7.35 |
||||
12/17/93 |
580 |
104 |
1,828 |
3,080 |
7.59 |
||||
7/29/97 |
554 |
97.5 |
1,760 |
.001 |
3,110 |
7.8 |
|||
1997 |
2,172 |
N/A |
|||||||
Regulated Inorganic Chemicals
Date |
Barium |
Beryl lium |
Cad mium |
Chromium |
Copper |
Iron |
Lead |
Mer cury |
Nitrate |
Selen ium |
Silver |
Zinc |
Sodium |
9/27/90 |
ND |
-- |
ND |
ND |
13. |
ND |
ND |
.2 |
6.2 |
ND |
ND |
206 |
206 |
8/14/92 |
.01 |
<.01 |
<.01 |
.99 |
<.01 |
<.01 |
1.7 |
<.01 |
.48 |
230 |
|||
7/10/97 |
.134 |
-- |
.004 |
0.011 |
0.01 |
57.9 |
|||||||
MCL: mg/ltr |
2 |
.004 |
.005 |
0.1 |
1.3 |
None |
.015 |
.002 |
10 |
.05 |
.10** |
5** |
** Secondary Standard/Recommended Level
Regulated Radioactive Chemicals
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 |
||||
6/22/98 |
60 ± 5 |
11 ± 24 |
0.069 |
||||||
9/28/98 |
68 ± 8 |
22 ± 25 |
.006 ± 0.1 |
0.065 |
|||||
12/04/98 |
72 ± 20 |
25 ± 26 |
0.061 |
||||||
3/09/99 |
53 ± 17 |
20 ± 11 |
0.0483 |
||||||
4/15/99 |
43 ± 9.8 |
25 ± 6 |
0.0243 |
||||||
6/10/99 |
29 ± 14 |
23 ± 11 |
0.0508 |
||||||
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 |
||||||
10/9/00 |
55 ± 18 |
99 ±12 |
0.0720 |
||||||
4/02/01 |
130 ± 70 |
88 ± 61 |
0.0444 |
||||||
2/19/02 |
61.2 ± 20 |
24.8 ± 10 |
31.2 |
1.05 ± 0.96 |
20.8 ± 2.8 |
0.0532 |
|||
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 |
|||
11/14/02 |
25.7 |
35.4 |
23.9 |
0.26 |
18.1 |
0.0455 |
|||
1/24/03 |
20.2 |
18.2 |
23.3 |
1.25 |
16.1 |
0.0474 |
|||
4/22/03 |
73.5 |
50.1 |
27 |
0.6 |
21.5 |
0.0478 |
|||
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 |
MCLG** |
0 |
0 |
Ra 226 + 228 = 0 |
None |
None |
None |
None |
0 |
|
MCL |
15 pCi/l |
4 mrem/yr |
Ra 226 + 228 = 0 |
None |
None |
None |
None |
0.03 mg/l |
|
* 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].