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Pond Sites <br />In addition to the springs, seeps, and streams, ponds are also present on the site. These <br />ponds aze utilized to provide water for livestock and wildlife. A total of nineteen ponds <br />were located by ground and aerial surveying methods (Map 2.04.7-1). A lazge number of <br />these ponds (eight) are located in the Cow Canyon drainage. The other ponds aze <br />scattered over the site, with generally no more than two in any drainage. All ponds <br />located appeaz to be artificial, with man-made dams at one end. Water level in the ponds <br />vanes from season to season depending on runoff received in the drainages and CBM <br />wells; however, all ponds consistently hold water. One pond (PJC-1}was monitored in <br />2006 (Appendix IV). It contained water up to the 4" below the level of the culvert <br />placed to discharge excess water from the pond. No flow from the pond was observed <br />during the monitoring event. <br />Sediment control ponds have been constructed to treat disturbed azea runoff. No <br />dischazge from Ponds 6, 7, 8, 9 and 9A occurred during 2005. Quarterly Discharge <br />Monitoring Reports (DMRs) have been filed with the Colorado Department of Public <br />Health and the Environment with copies to the Division. Ponds 7, 8, and 9 dischazged <br />during the third quarter of 2006. <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 Standazds for Arkansas River Basin (3.2.0). <br />effective August 30, 1995. Receiving stream standazds from Region 7, Lower Arkansas <br />River Basin, Stream Segment Sa were utilized. These standards refer to the Mainstream <br />of the Purgatoire River and the Middle Fork of the Purgatoire from the USGS gage at <br />Stonewall to Interstate 25. Standards included physical, biological, inorganic, and metals. <br />Surface Water Stations <br />Data was collected from each of the surface water stations during the 1996 to 2006 <br />monitoring period. Each of the stations was monitored for field parameters and samples <br />were obtained from the site for laboratory analyses in accordance with Table 1-1. <br />Summary tables showing the results from all the surface water locations are included in <br />Appendix 2. Stations LC-1 , LC-2, and PC-1 continued to show signs of increased levels <br />of TDS, sodium and SAR likely related to coalbed methane development. <br />The principal water type in the surface waters is acalcium-sodium bicazbonate type. This <br />water is typically neutral to partially alkaline, with low hardness, and low to moderate <br />salinity, pH ranges from 7.4 to 8.7, and hardness ranges from 107 mg/L to 435 mg/L. <br />Total dissolved solids in the samples ranged from 210 -980 mg/L (filterable residue). An <br />increase in TDS of 10 mg/L has been noted between the upstream and downstream <br />stations on the Purgatoire River, likely due to higher TDS dischazges from coalbed methane <br />activities in Lorencito Canyon <br />