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lowering significantly during the spring and early summer following anowmelt. low • <br />herdnese concentrations have been measured et Yell YSAL72 during the spring end early <br />summer, often by a factor of two. No distinct seesonsl pattern for herdnese has been <br />detected et Vell YSAL3. <br />Concentrations of sever el trace elements have been detected et ell four Sege Creek <br />alluvial wells, including Be, B, F, Fe, and Zn. Detectable concentrations of Cu, Cd, Hg, <br />Si, end V have also been measured et least once at one or more alluvial wells, although, <br />with the exception of Si, et very low concentrations. Only iron and silica have been <br />measured et concentrations greater then 1.0 mg/l. Iron values greater than 7.0 mg/t have <br />been observed et Yells YSAL3, TSALB, end YSAL72, although never greeter then 4.0 mg/l. <br />Although no use-related standard has been set for this parameter, silica was fncluded fn <br />the analysis suites collected.in Wells YSAL7, YSALB, end YSAL72 prior to 1991 (USGS), but <br />never exceeded 20 mg/l. <br />Lennox Coal. Wells YLS and YL6 both monitor water quality in the Lennox Coal (see Exhibit <br />7-1). Only one full water quality suite was collected at YLS during the baseline period. <br />Table 7-13 presents summary Comments regarding water types depicted on trilineer diagrams • <br />and listed in percent milliequivalent tables found in Appendix 7-4. Both Lennox coal <br />wells exhibit HgCaXC03 SO4 water types without seasonal variability. <br />7otel dissolved solids in the Lennox coal seam ranges from 920 up to 7200 mg/l (YLS). <br />Haan TDS variability over the four seasons et YLb has been slight, just under 70 mg/l. <br />Sulfate has ranged from 303 to 480 mg/l (YLS), also exhibiting slight seasonal <br />variability. Field pX values et Yell YL6 have ranged from 6.8 up to 7.0 S.U. and the one <br />field pH collected at YLS was 6.7 S.U. Ground water in the Lennox coal seam shows little <br />seasonal variability in pH, end can be considered neutral to slightly acidic. Hardness as <br />CaC03 ranges from 656 mg/t up to 880 mg/l (YLS) with some slight seasonal variability <br />(lowest in spring, increasing summer through fell). Lennox coal ground water is <br />classified as very hard. <br />Detectable concentrations of the following trace element6 have been observed at either <br />Lennox coal well: 8e, B, F, Fe, Pb, Ni, Si, Zn. Of these, only silica was measured et <br />concentrations greater then 1 mg/l, end since no use-related standard exists for this <br />parameter, these measurements have little significance. • <br />Lennox Overburden. Yells YLOV3 end YLOV6 both monitor water quality in the Lennox <br />G4 Revised 03/07/95 <br />