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• mg/I and .39 mg/1, respectively) than during the irrigation season (6.8 mg/I, .49 mg/I and .08 mg/I, <br />respectively). These higheraverages fortheseconstituents at SW-N102 after the irrigation season <br />ended probably reflect the gradual recession of tail water discharge (hence, higher concentrations) <br />after irrigation ceases. <br />Surface water Site SW-N103 was situated in Calamity Draw about .6 miles downstream of <br />SW-N101. It was the furthest downstream monitoring site Peabody routinely monitored for water <br />quality in Calamity Draw. Monitoring for water quality at SW-N103 began in July of 1986 <br />(Attachment 2.04.7-11 (Peabody Appendix 7-9)). <br />The water type at Site SW-N103 for both seasons was a calcium magnesium sulfate (Attachment <br />2.04.7-10 (Peabody Appendix?-8)). Thiswatertypewasverysimilartowaterssampledupstream <br />in Calamity Draw at Site SW-N101. During periods of irrigation, the major ions at SW-N103 were <br />slightly lower than shown at SW-N101. This suggested that contributions to flow in Calamity Draw <br />between these sites due to irrigation tail water provided a dilution effect. <br />• Little variability between the seasons for pH was detected at SW-N103. During irrigation, pH <br />averages 7.84 and ranges from 6.84 up to 8.10 units. Afterthe irrigation season, pH averages 7.88 <br />and ranges between 7.50 and 8.06 units. <br />Similar to previously discussed surface water monitoring sites, the mean of TDS during the <br />non-irrigation season was more than double (3,135 mg/I) the mean for this constituent during the <br />irrigation period (1,371 mg/I). Again, the higher levels of the major ions in Calamity Draw at this <br />site after irrigation stops explains this trend. <br />At Site SW-N103, both TSS and FeT averaged higher during the irrigation period (57.0 mg/1 and <br />1.46 mg/I, respectively) than after irrigation has ceased (39.4 mg/I, TSS and 1.05 mg/I FeT). The <br />mean value of Fep was slightly higher (.04 mg/1) during the non-irrigation period compared to the <br />average Feo (.02 mg/I) determined for the irrigation season. As seen for all previously discussed <br />sites, MnT averaged consistently higher (1.24 mg/I) after the irrigation season ended than during <br />the irrigation period (.33 mg/I). <br />• West Lateral Irrigation Ditch -Flow and Water Quality. The West Lateral irrigation ditch is part <br />REVISED JULY 2006 2.04.7-33 <br />