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REP45335
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Last modified
8/25/2016 12:48:00 AM
Creation date
11/27/2007 10:33:50 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Report
Doc Date
12/11/2001
Doc Name
WEST ELK MINE 2000 ANNUAL HYDROLOGY REPORT
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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Mountain Coal Companp 2000 Annual Hydrology Report Werr E!k Mine <br />Sampling Methods <br />. Monitoring measurements included field and laboratory parameters as identified in Footnote No. <br />2 of Table 4. Static water levels were measured at each well. The field technician then sampled <br />each well the same way each time the well was visited. In general, the groundwater wells in the <br />vicinity of the West Elk Mine do not exhibit recovery within the time necessary to complete <br />sampling. For this reason, as explained during the 1993 Permit Renewal, three casing volumes <br />of water are not removed from the wells. Instead, a PVC thief with a brass foot valve is used to <br />obtain samples. The bailer was rinsed with distilled water before and afrer each sample. After <br />rinsing, the bailer was gently lowered into the water column in the well. The sample was <br />obtained, striving to disturb the well water column as linle as possible during sampling and <br />retrieval. Prior to measurement, instruments and equipment were rinsed with distilled water. <br />Field parameters were measured and the water sample was divided into the proper sample <br />bottles, sealed, cooled as appropriate, boxed, and delivered to the laboratory for analysis. In <br />some cases, samples may not be available since there was insufficient water for sampling. This <br />means that there was not enough water to fill the sample bottles, plus provide an additional 300 <br />to 500 ml of sample for rinsing and field parameter measurement. <br />Underdrain and Mine Water Monitoring <br />In addition to the surface, spring and seep, and groundwater well sites, MCC monitors some <br />other miscellaneous flows that are summarized in Table 6. These miscellaneous flows include <br />monitoring potential flow from the underdrains at the lower refuse pile (LRP) and the refuse pile <br />• expansion (RPE) area and mine water inflows. MCC has in the past informally monitored mine <br />inflows, but due to the significant increase in mine inflows and Minor Revision No. 208, now <br />more formally monitors the inflows as described on Table 6 and in the following section. <br />Sampling Methods <br />Monitoring of the underdrains at the LRP and the RPE are conducted on a seasonal basis, usually <br />during spring when if there is flow it is more likely to occur. The underdrain at the lower refuse <br />pile daylights just above the sediment ditch at the base of the pile and on the east side of <br />sedimentation pond MB-2R. If there is flow, an attempt will be made to capture the flow before <br />it enters the sediment ditch by creating a step in the channel to facilitate positioning of a <br />container. The underdrains at the RPE daylight into a CMP prior to entering the RPE pond. <br />Flow measurements would be made by the timed volumetric method: where a field technician <br />times the filling of a container of known volume to determine the flow rate. Several <br />measurements would be made and averaged prior to reporting. Field parameters of temperature, <br />pH, and conductivity would be collected and a sufficient sample collected to send to the lab for <br />full suite analysis as described in Table 6. Proper sampling protocol, as described in a previous <br />section, would be followed, <br />Field parameters and water samples were collected from mine inflows that were of discernable <br />flow (>5 gpm) and/or lasted longer than seven days. If the mine inflows aze continuous, they <br />will be sampled at least annually. The locations of the mine inflows encountered during WY00 <br />and where samples were collected are shown on Map 1. <br />• <br />831-03?.550 Page 12 Wright Water Engineecc <br />
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