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64 <br />Alluvial water quality <br />Groundwater <br />Five rounds of water quality data are available for the alluvial monitoring wells <br />(December 2004 through April 2005). Additional data collected by KEC in 1996 and <br />1997 from MJ- 95 -01, MJ- 95 -02, and MJ -95 -03 were reviewed and integrated into the <br />conceptual hydrogeologic model. Results of the alluvial well samples are summarized in <br />Table 5.9. The complete dataset is provided in Appendix 5.K. Laboratory analysis <br />sheets for samples collected by KEC in 1995 -1996 are also included in Appendix 5.K. <br />Table 5.9 also lists the Federal MCLs and secondary drinking water quality criteria. All <br />samples exceeded the secondary drinking water MCL for TDS of 500 mg /l except for <br />samples from MJ- 95 -02. Water quality in several wells also exceeded the secondary <br />drinking water MCL for iron (0.3 mg /1) and manganese (0.05 mg /1). Exceedances for iron <br />and manganese are discussed below. <br />2572 -R2 Colowyo Coal Company <br />Water Management Consultants <br />