Sierrita Impoundment
Water
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
TDS |
pH Units |
12/17/79 |
|
631 |
<1 |
1,806 |
|
2,856 |
9.2 |
12/02/80 |
|
608 |
5 |
1,842 |
|
2,885 |
9.4 |
11/23/81 |
|
601 |
7 |
1,948 |
|
3,011 |
9.3 |
|
|
|
|
|
|
|
|
1989 |
|
655 |
.63 |
1,910 |
|
3,300 |
10.27 |
Monitor
Wells along Impoundment from N to S
MH-3 North End of Impoundment (2/76; 520 ft)
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
TDS |
pH Units |
4/25/79* |
|
|
|
482 |
|
1,000 |
|
4/22/80* |
|
|
|
475 |
|
955 |
|
4/24/81* |
|
|
|
480 |
|
1,000 |
|
4/30/82* |
|
|
|
470 |
|
960 |
|
6/25/97 |
|
171 |
35.7 |
440 |
|
940 |
7.4 |
9/30/97 |
|
168 |
35.5 |
460 |
|
900 |
7.7 |
4/4/01 |
|
478 |
106 |
1,650 |
|
2,660 |
7.3 |
12/6/04 |
|
|
|
1,660 |
|
|
|
MH-14 North End of Impoundment (near MH-3)
Date |
Hardness |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mc/l |
TDS |
pH units |
8/31/90 |
|
370 |
82 |
1,125 |
|
1,930 |
7.5 |
10/8/90 |
|
320 |
80 |
961 |
|
1,756 |
7.11 |
9/9/91 |
|
360 |
75 |
1,034 |
|
2,052 |
7.13 |
8/14/92 |
|
300 |
71.6 |
1,095 |
<.01 |
1,862 |
7.08 |
9/16/93 |
|
360 |
79.5 |
1,349 |
|
2,170 |
7.07 |
|
|
|
|
|
|
|
|
7/29/97 |
|
420 |
82 |
1,160 |
|
2,220 |
7.6 |
6/19/98 |
|
419 |
84.3 |
1,110 |
|
2,160 |
6.9 |
12/04/98 |
|
427 |
93.4 |
1,340 |
|
2,330 |
6.8 |
7/5/00 |
|
443 |
96.1 |
1,390 |
|
2,400 |
7.5 |
4/2/01 |
|
451 |
98.1 |
1,550 |
|
2,550 |
7.2 |
4/15/02 |
|
440 |
99.1 |
1,430 |
|
2,490 |
6.7 |
4/22/03 |
|
429 |
92.7 |
1,370 |
|
2,410 |
7.4 |
6/28/04 |
|
445 |
102 |
1,480 |
|
2,590 |
7.4 |
1/30/06 |
|
|
|
1,500 |
|
|
|
MH-4 One Quarter Mark—North Half of Impoundment
(3/76; 550 ft)
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
TDS |
pH Units |
/25/97 |
|
427 |
54.7 |
1,260 |
|
2,210 |
7.6 |
9/23/97 |
|
600 |
58.8 |
1,650 |
|
2,900 |
7.6 |
4/5/01 |
|
|
|
2,090 |
|
|
|
MH-5 Half-Point of Impoundment (3/76; 640 ft.)
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
TDS |
pH Units |
4/25/79* |
|
|
|
1,435 |
|
2,350 |
|
4/22/80* |
|
|
|
1,440 |
|
2,400 |
|
4/24/81* |
|
|
|
1,445 |
|
2,760 |
|
4/30/82* |
|
|
|
1,520 |
|
2,860 |
|
6/25/97 |
|
470 |
80 |
1,970 |
|
3,140 |
7.4 |
9/30/97 |
|
437 |
75.7 |
1,750 |
|
2,890 |
7.7 |
12/12/05 |
|
|
|
1,900 |
|
|
|
MH-15W South of
Date |
Hardness |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mc/l |
TDS |
pH Units |
9/27/90 |
|
525 |
107 |
1,800 |
|
2,995 |
7.6 |
7/9/91 |
|
480 |
102 |
1,690 |
|
2,856 |
7.08 |
6/4/92 |
|
444 |
105 |
1,792 |
.01 |
2,884 |
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 |
|
3,110 |
7.8 |
6/22/98 |
|
557 |
90 |
1,780 |
|
3,260 |
7.6 |
6/10/99 |
|
498 |
124 |
1,530 |
|
2,770 |
7.1 |
7/5/00 |
|
537 |
94 |
1,820 |
|
3,130 |
7.5 |
4/2/01 |
|
487 |
96.3 |
1,840 |
|
3,080 |
7.3 |
4/15/02 |
|
560 |
93.5 |
1,850 |
|
3,170 |
7.3 |
4/22/03 |
|
549 |
82.2 |
1,750 |
|
3,110 |
7.6 |
6/28/04 |
|
544 |
87.9 |
1,790 |
|
3,140 |
7.38 |
1/27/06 |
|
|
|
1,750 |
|
|
|
MH-6 Quarter Mark—South Half of Impoundment (3/76;
960 ft)
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
TDS |
pH Units |
6/26/97 |
|
569 |
98.3 |
1,920 |
|
3,020 |
7.5 |
9/30/97 |
|
557 |
93.6 |
1,510 |
|
2,790 |
7.8 |
12/09/05 |
|
|
|
1,720 |
|
|
|
MH-16W South Quarter of Impoundment
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
TDS |
pH Units |
|
9/27/90 |
|
78 |
17 |
173 |
|
495 |
7.6 |
|
10/8/90 |
|
57 |
16 |
124 |
|
517 |
7.49 |
|
7/9/91 |
|
80 |
11 |
120 |
|
570 |
7.28 |
|
8/14/92 |
|
42.6 |
10.4 |
48.4 |
<.01 |
293 |
7.5 |
|
9/6/93 |
|
56.4 |
14.4 |
47.8 |
|
334 |
7.68 |
|
*Note |
huge |
jump in |
levels |
in |
four |
years! |
|
|
7/29/97 |
|
566 |
135 |
1,550 |
|
2,760 |
7.7 |
|
6/22/98 |
|
524 |
101 |
1,620 |
|
2,830 |
7.4 |
|
3/8/99 |
|
539 |
111 |
1,750 |
|
2,950 |
7.2 |
|
7/5/00 |
|
559 |
113 |
1,810 |
|
3,010 |
7.6 |
|
4/2/01 |
|
551 |
113 |
1,980 |
|
3,030 |
7.0 |
|
4/15/02 |
|
553 |
116 |
1,900 |
|
3,170 |
7.0 |
|
4/22/03 |
|
555 |
106 |
1,680 |
|
3,090 |
7.4 |
|
3/11/04 |
|
524 |
113 |
1,910 |
|
3,170 |
7.8 |
|
1/30/06 |
|
|
|
1,180 |
|
|
|
|
MH-9 South End of Impoundment (7/76; 1,400 ft)
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
TDS |
pH Units |
|
|
|
|
|
|
|
|
6/26/97 |
|
163 |
39.7 |
400 |
|
930 |
7.7 |
9/30/97 |
|
314 |
51.6 |
770 |
|
1,280 |
7.8 |
12/06/05 |
|
|
|
420 |
|
|
|
Monitor
Wells between
MH-12 (2/77; 800 ft)
Located approximately ľ mile east of
dam, approximately in line with north end of dam
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
TDS |
pH Units |
4/24/79 |
|
94 |
19 |
251 |
|
660 |
7.18 |
7/12/79 |
|
193 |
44 |
572 |
|
1,023 |
8.19 |
12/17/79 |
|
85 |
17 |
143 |
|
550 |
7.32 |
4/23/80 |
|
84 |
45 |
288 |
|
722 |
7.85 |
10/20/80 |
|
89 |
18 |
178 |
|
563 |
7.73 |
12/19/80 |
|
83 |
17 |
214 |
|
625 |
7.90 |
4/29/81 |
|
193 |
42 |
559 |
|
1,068 |
7.93 |
9/18/81 |
|
130 |
2 |
223 |
|
752 |
7.53 |
12/10/81 |
|
130 |
0 |
236 |
|
660 |
7.39 |
4/28/82 |
|
139 |
4 |
263 |
|
690 |
7.20 |
9/30/82 |
|
104 |
36 |
266 |
|
680 |
7.78 |
|
|
|
|
|
|
|
|
9/25/97 |
|
285 |
58.6 |
860 |
|
1,640 |
-- |
2/26/98 |
|
310 |
60.7 |
860 |
|
1,590 |
7.23 |
6/30/98 |
|
334 |
61.7 |
880 |
|
1,760 |
6.93 |
4/04/01 |
|
321 |
65.9 |
980 |
|
1,720 |
7.3 |
12/2/03 |
|
342 |
67.3 |
1,050 |
|
1,860 |
|
3/15/04 |
|
336 |
69.7 |
1,040 |
|
1,900 |
|
4/20/06 |
|
|
|
1,090 |
|
|
|
MH-11 (2/77; 820 ft)
Located approximately ľ mile east of
dam, at quarter point, north side of dam
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
TDS |
pH Units |
4/23/79* |
|
|
|
1,220 |
|
1,940 |
|
4/22/80* |
|
|
|
1,080 |
|
1,800 |
|
4/24/81* |
|
|
|
1,100 |
|
1,760 |
|
4/30/82* |
|
|
|
1,140 |
|
1,920 |
|
4/23/79 |
|
253 |
109 |
1,226 |
|
2,001 |
7.35 |
9/14/79 |
|
296 |
132 |
1,257 |
|
1,953 |
7.28 |
12/17/79 |
|
344 |
27 |
1,006 |
|
1,719 |
7.28 |
4/24/80 |
|
334 |
72 |
1,073 |
|
1,827 |
7.32 |
6/27/80 |
|
342 |
73 |
1,098 |
|
1,825 |
7.40 |
12/19/80 |
|
320 |
74 |
1,116 |
|
1,888 |
7.52 |
4/29/81 |
|
348 |
79 |
1,118 |
|
1,876 |
7.54 |
9/18/81 |
|
415 |
33 |
1,119 |
|
1,905 |
7.38 |
12/10/81 |
|
472 |
33 |
1,122 |
|
1,964 |
7.20 |
4/28/82 |
|
480 |
13 |
1,133 |
|
1,971 |
6.84 |
9/30/82 |
|
404 |
46 |
1,089 |
|
1,881 |
7.65 |
|
|
|
|
|
|
|
|
9/30/97 |
|
438 |
98.1 |
1,280 |
|
2,240 |
-- |
2/26/98 |
|
494 |
104 |
1,440 |
|
2,500 |
7.08 |
6/30/98 |
|
454 |
103 |
1,440 |
|
2,570 |
6.96 |
3/10/99 |
|
509 |
159 |
1,900 |
|
3,460 |
-- |
4/05/01 |
|
534 |
106 |
1,840 |
|
2,790 |
7.3 |
8/14/03 |
|
508 |
111 |
1,670 |
|
2,920 |
|
12/2/03 |
|
517 |
112 |
1,540 |
|
2,790 |
|
3/16/04 |
|
489 |
106 |
1,640 |
|
2,800 |
7.2 |
1/24/06 |
|
|
|
1,570 |
|
|
|
MH-13 (2/77; 1,425 ft)
Located approximately ľ mile east of
dam, aligned with the center of dam
Date |
Hardness as CaCO3 |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic mg/l |
TDS |
pH Units |
4/25/79* |
|
|
|
720 |
|
1,320 |
|
4/22/80* |
|
|
|
690 |
|
1,225 |
|
4/24/81* |
|
|
|
980 |
|
1,590 |
|
4/30/82* |
|
|
|
950 |
|
1,560 |
|
4/24/79 |
|
220 |
59 |
721 |
|
1,314 |
7.32 |
7/12/79 |
|
311 |
89 |
1,047 |
|
1,659 |
7.58 |
9/19/79 |
|
152 |
32 |
442 |
|
900 |
7.24 |
12/21/79 |
|
236 |
51 |
650 |
|
1,250 |
7.46 |
4/28/80 |
|
240 |
37 |
663 |
|
1,247 |
6.57 |
12/31/80 |
|
319 |
66 |
1,064 |
|
1,805 |
7.50 |
4/29/81 |
|
324 |
62 |
994 |
|
1,661 |
7.59 |
9/16/81 |
|
386 |
15 |
960 |
|
1,652 |
7.40 |
12/10/81 |
|
420 |
3 |
1,006 |
|
1,743 |
7.34 |
5/25/82 |
|
388 |
7 |
934 |
|
1,750 |
7.22 |
8/26/82 |
|
252 |
54 |
711 |
|
1,513 |
8.03 |
9/30/82 |
|
356 |
55 |
1,070 |
|
2,000 |
7.85 |
|
|
|
|
|
|
|
|
4/04/01 |
|
508 |
92.8 |
1,690 |
|
2,650 |
7.0 |
8/14/03 |
|
557 |
91.8 |
1,650 |
|
2,940 |
7.33 |
12/02/03 |
|
514 |
93.4 |
1,610 |
|
2,750 |
|
3/11/04 |
|
505 |
98.1 |
1,620 |
|
2,740 |
7.20 |
4/29/06 |
|
|
|
1,750 |
|
|
|
*Approximations read from graphs in “Mines Task
Report”, 1983
Community
Water Well #8
CWC 8 – Due West of MH-3, MH-14 and MH-12
Year |
Hardness |
Calcium mg/l |
Magnesium mg/l |
Sulfate |
Arsenic |
TDS |
pH |
1994* |
146 |
46.7-70 |
7.14 |
59.8-94 |
|
286 |
|
1995* |
160 |
59.96 |
4.33 |
138 |
. |
396-422 |
|
1996* |
|
|
|
131-374 |
|
376-546 |
|
1997* |
|
|
|
233-337 |
|
564-728 |
|
1998* |
|
|
|
324-553 |
. |
603-873 |
|
1999* |
381-502 |
131-170 |
13-19 |
316-578 |
|
636-884 |
|
|
|
|
|
820 |
|
1280 |
|
2000* |
521 |
179 |
18 |
390-456 |
|
704-880 |
|
2001* |
488 |
164 |
19 |
428-479 |
|
780-896 |
|
2002* |
488 |
166 |
18 |
475-487 |
.007 - .015 |
776-922 |
|
2003 |
565 |
190 |
22 |
547 |
.011 |
956 |
|
2004 |
587 |
|
22 |
502 |
.010 |
952 |
7.18 |
* In this year, more than one test was performed, therefore, the high and low values on all tests are given.
** On this test date, there were unusual readings, so they were separated out.
Note: The high readings in red
appear to correlate with “Hazardous Material Incident” reports from
Phelps-Dodge Sierrita mine.