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Wolf Creek Underburden. Well WWCU24 was drilled in August 2001. The two samples <br />collected so far display a Na-HC03S0< type water with TDS values of 1180 and 2380 mg/I. <br />Ground Water Quality Suitability. SCC has compiled lists of standards for irrigation and <br />livestock. These lists are composed mostly of Colorado Department of Public Health and <br />Environment (CDPHE) standards, although other agency standards have been used if they are <br />more stringent or if the CDPHE has no standard for a particular parameter. See SCC's Yoast <br />Mine Permit Application, Tables 7-21 and 7-23, for a more detailed explanation of these <br />standards. <br />Table 7-47 provides a comparison of ground water quality in the II-W South area to irrigation <br />standards. Standards that were exceeded were boron at one well, cadmium at four wells, <br />chlorides at one well, pH values at seven wells, fluorides at four wells, iron at six wells, <br />manganese at five wells, molybdenum at ten wells (most due to high detection limitsl, selenium <br />at one well, TDS at eleven wells, sulfates at eight wells, and zinc at two wells (due to the <br />galvanized pipe used in these two flowing wellsl. <br />Table 7-48 provides a comparison of ground water quality in the II-W South area to livestock <br />standards. Standards that were exceeded were chromium at three wells, pH values at seven <br />wells, and fluorides at two wells. Mercury and lead detection limits were higher than the <br />standards for two samples. <br />Surface Water Quality and Flow <br />Introduction. Table 15-1 (Tab 15, Hydrologic Monitoring Planl provides a summary of all <br />surface water monitoring sites at Seneca II-W. Appendix 7-10 provides surface water quality <br />and flow data. Data provided for each site includes a TDS vs. time plot with a LOWESS <br />regression line (see previous Ground Water Quality sectionl, milliequivalent tables, hydrographs <br />of flow data, statistical summaries of water quality data, individual water quality reports, and <br />finally remark reports. An update of data for Permit Revision 3 (Sage/Wolf Creek coal) in the II- <br />W South area may be found at the end of Appendix 7-10. <br />Site SW-S2W-SG9 (WSH9). This site exists on Hubberson Gulch upstream of Pond 017. It <br />was first sampled in August, 1997. Samples at this site display a CaMg-HCOaSOa type water <br />with an average TDS values of 354 mg/I (range 240-4001. <br />149 Revised 01/02 <br />