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2016-12-01_PERMIT FILE - C1980007 (6)
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2016-12-01_PERMIT FILE - C1980007 (6)
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Last modified
2/1/2017 10:42:32 AM
Creation date
2/1/2017 10:41:50 AM
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DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Permit File
Doc Date
12/1/2016
Doc Name
Hydrologic Characterization of the South of the Divide
Section_Exhibit Name
Exhibit 71
Media Type
D
Archive
No
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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network 5 <br />2.1 Gribble Gulch and Raven Gulch Monitoring Network <br />For analysis purposes in this report, the Gribble Gulch and Raven Gulch area includes West <br />Flatiron Drainage, Lone Pine Gulch, Upper and Lower Gribble Gulch, the drainage west of <br />Gribble Gulch, and Upper and Lower Raven Gulch (Map 1). <br />The Gribble Gulch and Raven Gulch hydrologic monitoring network includes both spring/seep <br />and surface water monitoring sites (Tables 1 and 2). Each monitoring site in these areas was <br />assessed for changes in general water quality and flow for the time period since it was <br />undermined (or the mining passed nearby). The parameters of pH (field), EC, total iron, <br />dissolved iron, TDS, and TSS comprise the WEM routine sampling analyte suite for sites with at <br />least five years of data. These analytes are good indicators of changes to general water quality <br />and they have an extensive period of record for all sites recommended for removal from the <br />monitoring network. <br />Thirteen spring and seep monitoring sites in the Gribble Gulch and Raven Gulch areas <br />(highlighted in yellow in Table 1) are recommended for removal from the current monitoring <br />network as discussed below. <br />2.1.1 Gribble Gulch Area Springs <br />The hydrologic monitoring network in the Gribble Gulch area currently includes eight springs: <br />G-25, G -26a, G -28a, G-30, G-31, G-35, G-49, and CR -12 (Table 1, Map 1). <br />2.1.1.1 Spring G-25 (Decreed Spring #22) <br />Spring G-25 is located in the Gribble Gulch drainage and is situated directly north of Panel 8 in <br />the Northwest B -Seam historic mine area (Map 1). It issues from alluvium and flows into a <br />holding pond. This spring has perennial flow which diminishes in late summer. This spring has <br />been monitored since 1977 and was undermined in May 1995. The spring flow measurements <br />have been highly variable over time because of seasonal changes, but show no trends. A time - <br />series flow graph for this spring is shown in Figure 1. <br />August 2016 HydroGeo, Inc. <br />
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