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West Elk Mine
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<br />Table 9
<br />Water LevellFlow
<br />Notes:
<br />1. Field parameters for surtace water, Around water and springs will include pH, conductivity, temperature.
<br />2. For surface water sites (including spfingsl with flue or more years of data: Laboratory analysis during the second sampling period
<br />(except for the North Fork sites during the third sampling period) for TSS, TDS, conductivity, pH and iron (dissolved and total).
<br />3. For surtace water sites (including spdngs) with less than five years of data: Annual analyses tludng the second sampling period
<br />(except for the N. Fork sites during the third sampling pefiotl) for surface water sites (streams and springs) will include laboratory
<br />analyses of pH, conductivity, total dissolvetl solids (TDS), total suspended solids (TSS), calcium, magnesium. sotlium, potassium,
<br />SAR, hardness, bicarbonate, chlodde, nitrate/nitrite. phosphate IPOi' as P), sulfate, iron (total antl dissolved), manganese (total antl
<br />dissolved), aluminum, arsenic (total recoverablel. cadmium. cooper, lead, mercury (fatal recoverable), molybdenum, selenium (total
<br />recoverablel, boron, and zinc. All parameters will be analyzed for their dissolved form unless stated otherwise.
<br />4. For groundwater sites with fve or more years of data: Laboratory analysis during the third sampling Deriod will include TDS,
<br />conductivity, pH and iron (dissolved and total).
<br />5. For groundwater sites with less than fve years of data (and for mine inflows): Annual analyses during the third sampling period for
<br />ground water sites will include laboratory analyses of pH, cendudiviiv, total dissolved solids (TDS), calcium, magnesium, sodium,
<br />potassium, SAR, hardness, bicarbonate, chloride, un-ionized ammgnia, nitrate/nitrite, phosphate (PD:' as P), sulfate, iron (total and
<br />dissolved), manganese (total and dissolved), arsenic, cadmium, lead, mercury. selenium, boron, and zinc. All parameters will be
<br />analyzed far their dissolved form unless stated otherwise.
<br />6. Stream gages with continuous recorders.
<br />7. Reference Map 37.
<br />8. To be the schedule after at least one year of baseline data obtained.
<br />9. Instantaneous flow measurement.
<br />10. Field parameters and a water sample will be obtainetl (and parameters per footnote #3 analyzed) if the inflow is of sufficient
<br />discernable flow (>5 gam) and/or lasts longer than 7 days. If the inflow is continuous, an initial sample will be obtained, and then
<br />sampled at least annually thereafter.
<br />in addition to providing baseline data, a portion of the Minnesota Creek gaging station network
<br />will be relied on to quantify stream depletions to Minnesota Creek (if any) from MCC's mining
<br />operations to provide the necessary augmentation water in accordance with the adjudicated plan
<br />(Exhibit 52). The extent of depletion, if any, will be quantified by correlating the streamflows of
<br />Minnesota Creek at the lower gaging station, approximately six miles upstream from its
<br />confluence with the North Fork, with sub-basins that could potentially be affected (Dry Fork and
<br />Lick Creek). A complete description of the streamflow correlation procedures is provided in the
<br />Application for Approval of Plan for Augmentation Concerning the Application of Water Rights
<br />of MCC in Gunnison and Delta Counties (WWE 1986) (Exhibit 52) and Engineering report,
<br />Water Augmentation Plan for MCC in Minnesota Creek Basin near Paonia (WWE 1985).
<br />As baseline hydrology data have been obtained in accordance with CDMG regulations, some of
<br />the Minnesota Creek gaging stations have been decommissioned until the summer before mining
<br />impacts are expected. Because MCC needs certain data to develop the streamflow correlations
<br />described in the augmentation plan, the following stations remain operational: Minnesota Creek
<br />Lower (USGS) gaging station, Minnesota Creek Upper (USFS) flume, Lower Dry Fork flume,
<br />Lick Creek flume and the Upper Dry Fork flume. The Upper Dry Fork flume was relocated in
<br />November 1981, to a downstream location with a more stable channel to more accurately
<br />measure flows.
<br />MCC has closed the Horse Creek flume, the South Prong flume and the East Fork upper station.
<br />Should mining advance to the point where these basins might be impacted, MCC will install new
<br />gaging stations, or reinstall the old stations, at least one monitoring season before any potential
<br />exists for streams to be impacted. None of these drainages is within the influence of mining in the
<br />• permit area. In the event that conditions are such that the gage cannot be reinstalled at the same
<br />2.Q4-85 Revised November 2004 PRI G
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