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T~ 4A <br /> CYPRUS YAMPA VALLEY COAL CORP <br /> SUMMART OF HATER DUALITY DATA <br /> STATION NUMBER: OBAV1 --- 008-AV-1 <br /> Average Std Maxi mtm Minimm Units Count Period <br />PHYSICAL PROPERTIES <br />TEMPERATURE FIELD 9.989 4.1 20.000 2.000 DEGREES C 91 08/84 - 09/94 <br />CONDUCTIVITY FIELD 1626.264 391.9 2420.000 517.000 UMHOS/CN 91 06/84 - 09/94 <br /> LAB 1775.000 522.2 2190.000 1040.000 UMHOS/CM 4 11/90 - 05/94 <br />PH FIELD 7.474 0.3 8.500 6.700 PH 91 08/84 - 09/94 <br />ALKALINITY TOTAL 487.667 172.8 710.000 272.000 MG/L 6 10/86 - 05/94 <br />HARDNESS TOTAL 897.375 108.2 1055.000 689.000 MG/L 8 03/86 - 05/94 <br />SOLIDS DISSOLVED 1257.250 438.8 1788.000 632.000 MG/L 8 03/86 - 05/94 <br /> SUSPENDED 208.000 0.0 208.000 208.000 MC/L 1 06/91 - 06/91 <br />OILAGREASE VISIBLE NOT APPLICABLE 2.000 0.0 2.000 2.000 UNDEFINED 25 10/91 - 09/94 <br />CATIONS <br />CALCIUM DISSOLVED 222.750 25.7 255.000 182.000 MG/L 8 03/86 - 05/94 <br />MAGNESIUM DISSOLVED 83.000 17.2 103.000 57.000 MG/L 8 03/86 - 05/94 <br />SODIUM DISSOLVED 103.000 23.6 127.000 68.000 MG/L 8 03/86 - 05/94 <br />SAR NOT APPLICABLE 1.474 0.3 1.746 1.063 UNDEFINED 8 03/86 - 05/94 <br />ANIONS <br />BICARBONATE AS HC03 489.375 264.3 866.000 167.000 MG/L 8 03/86 - 05/94 <br />CARBONATE AS [03 2.500 3.8 8.000 0.000 MG/L 4 03/86 - 05/94 <br />CXLORIDE NOT APPLICABLE 13.500 0.7 14.000 13.000 MG/L 2 03/86 - 04/86 <br />SULFATE NOT APPLICABLE 597.750 264.3 889.000 280.000 MG/L 8 03/86 - 05/94 <br />Report Date: 14-FEB-95 Page: 1 of 3 <br />Repor[ Nance: NDA020R <br />