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Water Quality. Surface water Site SW-N1 04 lies on the West Lateral irrigation ditch just upstream <br />of the northeastern boundary of the New Horizon 2 mining area (see Map 2.04.7-1A). Monitoring <br />of water quality at this site (when the ditch is on) was conducted on a monthly basis since July of <br />1986. Water quality data collected at this site since 1986 is contained in Appendix B of Attachment <br />2.04.7-5. <br />The irrigation water sampled over time at SW-N1 04 exhibited a calcium bicarbonate sulfate type <br />(Attachment 2.04.7-10 (Peabody Appendix 7-8).. The mean pH value at SW-N 104 is 8.09, ranging <br />from 7.71 up to 8.42. TDS averaged only 179 mg/I, and ranges between 116 and 264 mg/I. TSS <br />averaged 56 mg/I, varying from 8.0 to 106 mg/I. FeT, Fep and MnT average 1.21 mg/I, .02 mg/I and <br />.04 mg/I, respectively. <br />Surface water Site SW-N105 lies about midway between Sites SW-N104 and SW-N106 on the <br />West Lateral. Water quality data collected at this site since 1986 were compiled and are presented <br />in Appendix B of Attachment 2.04.7-5. <br />The watertype determined at Site SW -N 105 was a calcium bicarbonate sulfate (Attachment 2.04.7- <br />10 (Peabody Appendix 7-8). The pH averaged 8.04 at SW N105, and fell between 7.72 and 8.42 <br />units. The mean value determined for TDS was 185.7 mg/I, and TDS ranged from 142 to 278 mg/I. <br />TSS averaged 67 mg/I, and ranged from 4.0 to 204 mg/I. FeT, Fep and MnT averaged 1.48 mg/I, 02 <br />mg/I, 1.08 mg/I, respectively. <br />Site SW-N106 was the most downstream surface water site established on the West Lateral. <br />Attachment 2.04.7-11 (Peabody Appendix 7-9) contains the water quality data collected at this site <br />since July of 1986. As mentioned for both Sites SW N104 and SW-N105, the water type <br />determined for SW-N106 was a calcium bicarbonate sulfate. <br />At Site SW-N106, pH averaged 8.08 units, and ranged between 7.68 and 8.41 units. The mean <br />value determined for TDS was 179.7 mg/I, and TDS varied from 112.0 to 270.0 mg/1. TSS <br />averages 107.7 mg/L, ranging from 16.0 to 406 mg/I. FeT, Fep and MnT average 1.52 mg/1, .02 <br />mg/I and .05 mg/I, respectively. <br />From the previous discussions of water quality at Sites SW-N104, SW-N105 and SW-N106, the <br />2.04.7-43