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TABLE 12 CYPRUS YAMPA VALLEY COAL CORPORATION; FOIDEL CREEK MINE 1995 ANNUAL HYDROLOGY REPORT HYDROLOGY MONITORING DATA SITE: WELL 001-S-5 DATUM 6804.95 Field;~::~::~:~...::.:~:::::::~:'.::.::~~~~:~:.~::~~'::~::':~:~~ OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP Peierne[ers:.:~::~"~.;~:.:;~::?~:::~;~~::':'~:;:D.liTE.::: 10/27/94 11/21/94 12/30/94 01/18/95 02/16/95 03/29/95 04/26/95 05/10/95 06/07/95 07/10/95 08/01/95 09/05/95 Water Depth Iftl 4.300 4.100 3.500 3.600 2.900 2.800 2.600 1.490 1.580 2.560 3.010 3.570 Elevation Ift above msll 6800.65 6800.85 6801.45 6601.35 6802.05 6802.15 6802.35 6803.46 6803.37 6802.39 6801.94 6801.38 Temperature IC°) 11 11 7 7 6 9 11 7.5 10.6 12.6 13.1 13.5 Conductivity lumhos/cml 1600 1710 1980 2230 1920 1960 2020 1940 1860 1870 1860 1790 pH 7.7 8 8 8 7.7 7.7 7.6 7.4 7.7 7.5 7.7 7.5 Parameters;:;.:.::...''::: ':' ::.:.:..:. :::::.' Conductivity @ 25 C° lumhos/cml 1980 2070 1810 1840 Total Alkalinity (mg/II 485 466 429 744 Hardness as CaC03 Img/II 667 618 546 Solids, total dissolved Img/II 1440 1530 1264 1330 Bicarbonate as HC03 (mg/11 582 559.2 514.8 892.8 Carbonate as C03 Img/II -2 -2 -2 -2 Sulfate Img/II 700 730 630 630 Calcium, dissolved Img/II 160 156 145 127 Magnesium, dissolved Img/II 69 67.5 62.2 55.6 Sodium, dissolved Img/II 210 204 208 179 SAR in Water 3.48 3.68 3.37 Cadmium, dissolved lug/II -0.1 -0.5 -0.5 -0.5 Lead, dissolved lug/II -20 -20 -20 -20 Mercury, dissolved lug/II -0.2 -0.2 -0.2 -0.2 Selenium, dissolved luglll -1 -1 -1 -1 Iron, dissolved lug/II 320 180 200 90 Manganese, dissolved lug/II 140 128 108 85 Molybdenum, dissolved lugll) -10 -10 -10 -10 Nitrogen ammonia Img/II 7 3.2 1.83 1.26 Nitrate as N, dissolved Img/II 0.03 0.03 0.36 Nitrate/Nitrite as N Img/II 0.04 0.03 0.03 0.37 Phosphorus, ortho diss Img/II 0.53 0.012 -0.005 0.007