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Mountain Coa! Compan}• 1999 Annual Hydrology Report West Elk Mine <br />n <br />U <br />Table 6 <br />Underdrain and Mine Water Monitoring <br /> Water uali <br />Station Flow <br />Measurements Field Parameters Lab Analyses <br />LRP Underdmins I times per year 3 times per year Annually <br />RPE Underdrains' 3 times per year 3 times per year Annually <br />Mine Inflows ~ 3 times per y®r 3 times per year Annually <br />~ Field ammeters include H, conductive <br />p p ry, and temperature. <br />z Annual analyses during the third sampling period include laboratory analyses of pH, conductivity, total dissolved <br />solids (TDS), calcium, magnesium, sodium, SAR, hardness, bicarbonate, chloride, un-ionized ammonia, <br />nitrate/nitrite, phosphate (POa r ~ P), sulfate, iron (total and dissolved), manganese (total and dissolved), arsenic, <br />cadmium, lead, mercury, selenium and zinc. All parameters were analyzed for their dissolved form unless stated <br />otherwise. <br />~ LRP and RPE Underdrain flows are sampled seasonally. <br />Field parameters and a water sample will be obtained (and parameters per (oomote 112 analyzed) if the inflow is <br />of sufficient discernable Flow (>5 gpm) and/or lasts longer than 7 days. I(the inflow is continuous, an initial <br />sample will be obtained, and then sampled at least annually thereafter. <br />`f l1 <br />u <br /> <br />831-031.510 Page 13 WYight Warer Engineers <br />