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flow will involve measurement of stream temperature, pH, specific conductance, and collection of the necessary <br />samples for chemical analysis. <br />• It is anticipated that water percolating through the upgradient spoil, together with a small amount of mnoff from the <br />adjacent area, will enter into the Area 2 Pit and the combined amount will be sufficient to cause overflow from the pit <br />to Pond D. Tn order to measure the overflow, a cutthroat flume has been installed in the channel which connects the <br />pit and Pond D. The point betwcen the pit and Pond D has been designated as Site 7 and is wnsidered to be a spoil <br />spring site. At the Fish Creek Tipple, the springs emanating from the upslope side of Pond E are measured <br />semiannually for flow and field parameters. A full suite sample is collected for analysis at that time as well. In <br />addition to monitoring these particular spoil spring sites, the area surrounding the Fish Creek Tipple is incorporated <br />into the annual spring survey. This annual May survey was established in the hydrologic monitoring program of <br />Colorado Yampa Coal Company's Permit C-81-071. If additional springs are discovered, further monitoring <br />requirements will be accomplished in accordance with the spoil spring monitoring plan. <br />Details regarding the sampling schedule and tested parameters for both natural and spoil springs are located in <br />Exhibit 14, Hydrologic Monitoring Plan. <br />Discharge from the underground mine will be sampled at hvo locations: Site 109 and Site 115. Site 109 is located <br />near the main portals and the discharge water is piped the pit south of Pond D and then enters Pond D via the channel <br />behvcen the pit and the pond before entering Foidel Creek, or alternatively, it is piped to Site 114 where it is <br />eventually used for underground dust suppression. <br />Site 115 is located northwest from the main portal area. The water at this site is detained within a series of <br />impoundments before its discharge to Fish Creek. Site 109 is sampled for a full suite analysis quarterly while Site <br />115 is sampled per the requirements of the NPDES Permit CO-0042161. At both sites, water discharge meters have <br />• been installed to monitor the quantity of mine discharge. <br />The Colorado Yampa Coal Company (CYCC) is presently responsible for meeting the effluent limitation standards <br />mandated by NPDES Permit CO-0027154. CYCC will maintain responsibility for the permit until effluent control <br />of the surface drainage entering the shared sedimentation pond from their property is no longer required. At that <br />time, the permit will be transferced to TCC, if necessary. TCC is directly responsible for NPDES Permit No. CO- <br />0036684 and CO-0042161. Permit No. CO-0036684 establishes the effluent limitations for the Fish Creek Tipple. <br />Permit No. CO-0042161 governs flow at the Fish Creek Dewatering Facility. The dewatering facility permit, issued <br />in July of 1989, establishes effluent limitations for mine discharge only; surface flow does not enter the impoundment <br />structures. <br />As with ground water monitoring, necessary surface water measurements and sample analysis will utilize standard <br />EPA measurement methods and ASTM test procedures. A list of the surface water parameters, which will be <br />analyzed, is presented as Table C of the Hydrologic Monitoring Plan (Exhibit 14). Effluent limitations for <br />discharges from sedimentation control and mine discharge structures are specified in one of three NPDES Permits: <br />CO-0027154, CO-0036684, or CO-0042161. The NPDES Permits are located in Exhibit 30 (Volume 111), Exhibit <br />10 (Volume VIII), and E.~hibit 44 (Volume IIIA), respectively. <br />In order to directly monitor the effect of mining into the saturated overburden unit, a mine water inflow survey will be <br />conducted once per year. The survey Hill consist of on-site measurement of water inflow where it occurs in the <br />mine, using bucket-and-stopwatch, portable weirs or flumes, and estimates of flow in areas where direct <br />measurement is not possible. The results of the survey will be plotted on a map of the mine and submitted as part of <br />the annual hydrologic monitoring reports. <br /> <br />APPR~ilE~ F[B o E 200Q <br />TR 99-32 2.05-170 1/28/00 <br />