Phelps Dodge Sierrita Mine
Off-Site Monitor Well MH-13
Monitor well on public state land between tailings dam and Green Valley
Located approximately � mile east of dam, approximately of center of dam
Sulfates and Dissolved Metals
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
Molybdenum |
TDS |
Alkalinity |
pH Units |
4/24/79 |
220 |
59 |
721 |
1314 |
7.32 |
||||
7/12/79 |
311 |
89 |
1047 |
1659 |
7.58 |
||||
9/19/79 |
152 |
32 |
442 |
900 |
7.24 |
||||
12/21/79 |
236 |
51 |
650 |
1250 |
7.46 |
||||
4/28/80 |
240 |
37 |
663 |
1247 |
6.57 |
||||
12/31/80 |
319 |
66 |
1064 |
1805 |
7.50 |
||||
4/29/81 |
324 |
62 |
994 |
1661 |
7.59 |
||||
9/16/81 |
386 |
15 |
960 |
1652 |
7.40 |
||||
12/10/81 |
420 |
3 |
1006 |
1743 |
7.34 |
||||
5/25/82 |
388 |
7 |
934 |
1750 |
7.22 |
||||
8/26/82 |
252 |
54 |
711 |
1513 |
8.03 |
||||
9/30/82 |
356 |
55 |
1070 |
2000 |
7.85 |
||||
4/04/01 |
508 |
92.8 |
1690 |
2650 |
7.0 |
||||
8/14/03 |
557 |
91.8 |
1650 |
2940 |
7.33 |
||||
12/02/03 |
514 |
93.4 |
1610 |
2750 |
|||||
3/11/04 |
505 |
98.1 |
1620 |
2740 |
7.20 |
||||
MCL |
None |
None |
250 �mg/ltr ** |
500 mg/ltr** |
None |
** Secondary standard set by EPA, not enforced in
Regulated Inorganic Chemicals
--not available--
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 |
8/14/03 |
10.8 � 1.6 |
23.7 � 2.6 |
ND |
ND |
ND |
6.4 � 1.1 |
0.4 � 0.3 |
2.4 � 0.7 |
0.0099 |
12/02/03 |
13.0 � 2.5 |
37.5 � 7.8 |
0.5 � 0.3 |
ND |
ND |
8.0 � 1.2 |
0.3 � 0.2 |
2.6 � 0.7 |
0.0098 |
3/11/04 |
9.5 � 3.1 |
13.3 � 7.0 |
ND |
ND |
ND |
6.8 � 1.2 |
ND |
2.8 � 0.8 |
0.0082 |
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 |
|
*�� 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].