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1 Lorencita Canyon Mine Annua( HydraloRic MonitarinR Report - 2001 <br />Spring and Seep Stations <br />' During 2002, one spring was monitored quarterly for flow and field parameters (SPJC-1). <br />Flow data and hydrographs are included in Appendix 3. Spring SPJC-1 had no flow, <br />throughout the year, probably due to the drought conditions. <br />Pond Sites <br />In addition to the springs, seeps, and streams, ponds are also present on the site. These ponds <br />are utilized to provide water for livestock and wildlife. A total of nineteen ponds were located <br />by ground and aerial surveying methods (Map 2.04.7-1). A large number of these ponds <br />' (eight) are located in the Cow Canyon drainage. The other ponds are scattered over the site, <br />with generally no more than two in any drainage. All ponds located appear to be artificial, <br />with man-made dams at one end. Water level in the ponds varies from season to season <br />depending on runoff received in the drainages, however, all ponds consistently hold water. <br />One pond (PJC-1) was monitored in 2002 (Appendix 3). It was dry during the May sampling: <br />' Surface Water Quality <br />Applicable standards for the Lorencito Canyon Mine are set forth by the Colorado Department of <br />' Public Health and Environment, Water Quality Control Commission document Classifications <br />and Numeric Standards for Arkansas River Basin (3.2.0), effective August 30, 1995. Receiving <br />stream standards from Region 7, Lower Arkansas River Basin, Stream Segment Sa were utilized. <br />These standards refer to the Mainstem of the Purgatoire River and the Middle Fork of the <br />Purgatoire from the USGS gage at Stonewall to Interstate 25. Standards included physical, <br />biological, inorganic, and metals. <br />Surface Water Stations <br />Data was collected from each of the surface water stations during the 1996 to 2002 monitoring <br />period. Each of the stations were monitored quarterly for field parameters and samples were <br />obtained semiannually from the site for laboratory analyses. Summary tables showing the <br />results from all the surface water locations are included in Appendix 2. Stations LC-1, LC-2, <br />and PC-1 showed signs of increased levels of TDS related to coalbed methane development. <br />Results from the surface water laboratory analyses was interpreted through the use of Piper <br />and Stiff diagrams. These diagrams indicate principal cation and anion milliequivalents per <br />liter and are useful for determining water type. Copies of these diagrams are included <br />in Appendix 2. The principal water type in the surface waters is acalcium-sodium bicarbonate <br />type. This water is typically neutral to partially alkaline, with low hardness, and low to <br />moderate salinity. pH ranges from 7.4 to 8.7, and hardness ranges from 107 mg1L to 435 <br />mg/L. Total dissolved solids in the samples ranged from 210 - 980 mg/L (filterable residue). <br />An increase in TDS of 10 mg/L has been noted between the upstream and downstream stations <br />AHR-00.4)5\March 10, 2003 7 <br />