Laserfiche WebLink
Water Ouality. Surface water Site SW-N104 lies on the West Lateral irrigation ditch just <br />• upstream of the northeastern boundary of the Nucla East mining area (see Exhibit 7-1). <br />Monitoring of water quality at this site (when the ditch is on) has been conducted on a <br />monthly basis since July of 1986. Water quality data collected at this site since 1986 is <br />contained in Appendix 7-9. Table 7-55 is a statistical summary of the water quality data <br />gathered at SW-N104. A trilinear plot (Piper diagram) of the distribution of major ions <br />from samples collected at this site is presented in Appendix 7-8. Figure 7-38 is a <br />Schoeller diagram of mean milliequivalent values for the major anions and cations. <br />The irrigation water sampled over time at SW-N104 exhibits a calcium bicarbonate sulfate <br />type (see Appendix 7-8). Figure 7-38 graphically portrays the relative mean <br />milliequivalent values that characterizes the water type, showing that calcium, <br />bicarbonate and sulfate are the predominate ions that typify irrigation Ovate r'at SW-N104. <br />The mean pH value at SW-N104 is 8.09, ranging from 7.71 up to 8.42. TDS averages only 179 <br />mg/1, and ranges between 116 and 264 mg/1. TSS averages 56 mg/1, varying from 8.0 to 106 <br />mg/1. FeT, FeD and MnT average 1.21 mg/1, .02 mg/1 and .04 mg/1, respectively. <br />• Surface water Site SW-N105 lies about midway between Sites SW-N104 and SW-N106 on the West <br />Lateral (see Exhibit 7-1). Water quality data collected at this site since 1986 have been <br />compiled and are presented in Appendix 7-9. Table 7-56 is a statistical summary of the <br />water quality data gathered at SW-N705. A trilinear plot (Piper diagram) of the <br />distribution of major ions for Site SW-N105 can be found in Appendix 7-8. Figure 7-39 is <br />a Schoeller diagram of mean milliequivalent values for the major ions determined for Site <br />SW-N105. <br />The water type determined at Site SW-N105 is a calcium bicarbonate sulfate (see Appendix <br />7-8). Figure 7-39 shows the dominate proportions (mean milliequivalent values) of the <br />calcium, bicarbonate and sulfate ions. <br />The pH averages 8.04 at SW-N105, and falls between 7.72 and 8.42 unilts. The mean value <br />determined for TDS is 185.7 mg/1, and TDS ranges from 142 to 278 mg/1. TSS averages 67 <br />mg/1, and ranges from 4.0 to 204 mg/1. FeT, FeD and MnT averages 1.48 mg/1, .02 mg/1 and <br />.OB mg/1, respectively. <br />• Site SW-N106 is the most downstream surface water site established on the West Lateral <br />7-175 Revised 04/11/88 <br />