2012-10-01_REVISION - M1977306 ‎(22)‎

• Permit No: M1977306
• IBM Index Class Name: REVISION
• Doc Date: 10/1/2012
• Doc Name: EPP- Submittal, Ecological Site Description to Pg. U-29.
• From: Cotter
• To: DRMS
• Type & Sequence: AM1
• Media Type: D
• Archive: No

Constituent
SPLP Ore
Laboratory
Results
SPLP
Waste
Rock
Laboratory
Results
Federal
MCL
Federal
Secondary
Standards
Colorado
Standard for
Groundwater
Colorado
Agriculture
Guidelines
Fluoride
0.2 mg/1
0.1 mg/1
2.0 mg/1
4.0 mg/1
2 mg/1
Sulfate
139 mg /1
4 mg /1
250 mg /1
250 mg /1
TDS*
294 mg/1
62 mg/1
500 mg/1
pH
8.17
9.5
Aluminum
0 mg/1
2.5 mg/1
0 'm .2
5 mg/1
Arsenic
0.168 mg /1
0.013 mg /1
O010
rn g
0.01 mg /1
0.1 mg /I
Molybdenum
4.3 mg/1
0 mg/1
0.035 mg/1
Selenium
1.05 mg/1
0.0038
mg /I
0.050
mg /1
0.05 mg /1
Uranium
001
0.16 mg/1
�
0.03 mg/1
Vanadium
38.7 mg /1
1.1 mg /1
0.1 mg /1
Zinc
0.01 mg/1
0.16 mg/1
2 mg/1
Gross Alpha
16.8 pCi /1
263 pCi /1
15
pCi /1
15 pCi /1
Radium 226
2.3 pCi/1
34 pCi/1
5 pCi/1
distance and impact aquatic life in the Dolores River. Aluminum is a major component
of clays and shales that comprise a significant portion of the site geology. Consequently,
the detection of aluminum in the SPLP analysis is not surprising.
Table 5: Constituents of Concern from the JD -9 Waste Rock and Ore Stockpile
Arsenic exceeds both Federal drinking water standards and Colorado guidelines. In the
natural environment, arsenic is fairly abundant in the earth's crust and in smaller amounts
in rock, soil, water and air; it is present in many minerals. About a third of the arsenic in
the atmosphere comes from natural sources, such as volcanoes, and the rest comes from
human activities. Natural geological arsenic contamination can be found in high levels in
drinking water that comes from deep wells, as is the case of Bangladesh. Some industrial
O'Connor Design Group Inc.
U -24