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Data was collected from each of the alluvial wells (MWJC-1, MWLC-1, MWLC-2, <br />_• and MWPC-1) during the 1996-2000 baseline monitoring period. Alluvial wells <br />MWLO-W and MWLO-E at the loadout facility were installed during April 2002. <br />During 2008, wells MWJC-1, MWLC-1, and MWLC-2 were monitored semi- <br />annually for water level and field parameters and annual water samples were <br />obtained for laboratory analyses. Summary tables showing the results from all the <br />alluvial wells are included in Appendix III Ground Water and Lab Reports in <br />Appendix IV. <br />Results from the laboratory analyses of baseline samples were interpreted through <br />the use of Stiff diagrams. Copies of these diagrams are also included in Appendix <br />III. The principal water type observed in the alluvial wells is a calcium-sodium <br />bicarbonate type. This water is typically neutral with low hardness and low to <br />moderate salinity The pH ranges from 7.42 to 8.7 and hardness ranges from 145 <br />mg/L to 605 mg/L. Total dissolved solids in the samples ranged from 260 to 1340 <br />mg/L (filterable residue). Discharge thought to be associated with coal bed methane <br />has increased dissolved solids in streams and alluvial well waters at stations MWJC- <br />1, MWLC- 1, MWLC-2, and MWPC-1 as compared to the baseline period prior to <br />commencing CBM activities. <br />• Surface Water Quality <br />Applicable standards for the Lorencito Canyon Mine are set forth by the Colorado <br />Department of Public Health and Environment, Water Quality Control Commission <br />document Classifications and Numeric Standards for Arkansas River Basin (3.2.0),, <br />effective August 30, 1995. Receiving stream standards from Region 7, Lower <br />Arkansas River Basin- Stream Segment 5a were utilized. These standards refer to the <br />Mainstream of the Purgatoire River and the Middle Fork of the Purgatoire from the <br />USGS gage at Stonewall to Interstate 25. Standards included physical, biological, <br />inorganic, and metals. <br />Surface Water Stations <br />Data was collected from each of the surface water stations during the 2008 <br />monitoring periods. Each of the stations was monitored for field parameters and <br />samples were obtained from the site for laboratory analyses in accordance with <br />Table 1-1. Summary tables showing the results from all the surface water locations <br />are included in Appendix 2. Stations LC-1 and LC-2 continued to show signs of <br />increased levels of TDS, sodium and SAR likely related to coal bed methane <br />development. <br />• The principal water type in the surface waters is a calcium-sodium bicarbonate type. <br />This water is typically neutral to partially alkaline, with low hardness, and low to <br />7