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<br />TABLE 13A <br />CYPRUS YAMPA VALLEY COAL CORP <br />SUMMARY OF WATER QUALITY DATA <br />STATION NUMBER: ObAW2 --- 006-AW-2 <br />NUTRIENTS <br />NITROGEN <br />PHOSPHATE <br />Average Std Neximm Ninimm Units Count <br />Period <br />ANNIUN-TOTAL 0.481 0.4 2.780 -0.020 NC/L 37 04/84 - 05/96 <br />AMNIA-FREE -0.005 0.0 0.064 -0.050 NO/L 34 11/83 - 05/96 <br />NITRATE 0.051 0,1 0.820 -0.020 MC/L 33 10/86 - 05/96 <br />NITRITE 0.007 0.0 0.050 -0.010 NC/L 6 08/94 - 05/96 <br />N03~N02 0.078 0,2 1.110 -0.020 NC/L 43 11/83 - 05/96 <br />ORTNO-DISS 0.020 0.1 0.570 -0.020 NC/L 40 11/83 - 05/96 <br />Report Date: 11-NAR-97 Pege: 3 of 3 <br />Report Name: WOA020R <br />