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PERMFILE123872
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Last modified
8/24/2016 10:21:33 PM
Creation date
11/25/2007 12:01:46 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1980003
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Doc Name
PRELIMINARY BASELINE GROUNDWATER HYDROLOGY STUDY FOR THE H-G MINE
Section_Exhibit Name
APPENDIX R
Media Type
D
Archive
No
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4.1.2.2 Groundwater Quality <br />Water samples were collected from wells G 1 and G-2. The analyses show <br />that the mining zone and sub-mining sandy sequence are similar in quality <br />(Table 5 and Exhibit 6). Both are relatively high in calcium and sulfate <br />and low in sodium, potassium, cloride, and bicarbonate. PIAS water supply <br />recommended maximum levels for ammonia, iron, manganese, and sulfate were <br />exceeded by water from both G 1 and G 2 (Pational Academy of Sciences and <br />National Academy of Engineering 1972). <br />4.1.3 Qualitative Hydraulic Characteristics <br />Air lift pump tests were conducted on wells G 1 and G 2 to determine sub- <br />surface water movement characteristics. <br />4.1.3.1 Pump Test Methodology <br />Since observations made during the drilling indicated two water-bearing <br />zones, the hole was completed with two wells (one in each aquifer), as <br />shown in Exhibit 22. After the wells were installed, air lift pump tests <br />• were conducted to determine the coefficient of transmissivity of the mine <br />zone strata and lower sands. The tests were conducted by inserting <br />threaded and coupled 1-inch pvc pipe into the piezometers and injecting <br />air from a compressor and regulating the air flow to obtain the most con- <br />stant flow of water. The flow was measured as it passed through a par- <br />shall flume, and pH, Eh, (oxidation-reduction potential) temperature, and <br />conductance were monitored. These data were included on Table 6. The <br />combined pH/eH values suggest the groundwater is in a slightly oxidized <br />environment. <br />To establish drawdown caused by pumping of the well, the beginning and <br />ending water levels were measured. For supporting information water <br />levels were measured after pumping was stopped to determine their reco- <br />very with time until pre-pumping conditions had been achieved. Both the <br />pumping and recovery data were analyzed following the modified non-equi- <br />C <br />14 <br /> <br />
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