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Matthew S. Hayes <br />June 28, 1989 <br />Page 11 <br />c. Typically, wells in the Mesaverde currently being monitored for the <br />F seam show a wide range of salinity as well. Papers published by <br />the USGS which discuss regional characteristics of the Mesaverde <br />have also shown a wide range of salinity data. Reasonably, we <br />would expect this in the lower coal member and the B seam. <br />d. Recent data has been added to update Tables 2.8.A.13, 2.S.A.14, <br />and 2.8.A.15. Due to the length of time necessary to construct the <br />B seam slopes and ventilation raise (approximately 10 months), <br />WECC will have collected in excess of 12 months of data before <br />actual B seam mining begins. WECC is currently collecting monthly <br />water levels, as well as a full suite quality data which exceeds <br />CMLRD requirements. <br />4. Additional information on the 1988 drill holes may be found in Appendix <br />A-29 as is referenced in the summary on page 2-283 across from the <br />words "1988 Drilling". Drilling and geophysical logs for SOM 127-H and <br />C-72-H were also provided in Attachments 1 and 2 of Exhibit 2.8.A.4 in <br />Volume lA of this technical revision application. <br />5. SOM-127-H is the only surface drill hole, but is not at the location <br />described. SOM-121 is located in the SE 1/4, SW 1/4, Section 21, <br />Township 135, R90W. This hole was drilled from the surface for coal <br />quality information, but was not completed for hydrology monitoring. <br />SOM U-3 was drilled from within the F seam mine, the "U" indicating <br />underground. SOM U-3 was incorrectly referred to as DH-3 in the <br />discussions of interburden analyses presented in Exhibit 3.4.A.5. SOM <br />U- and DH-3 aze one and the same. <br />6. WECC will acquire baseline monitoring data as required by the Colorado <br />Regulations for Coal Mining for permitting of mining in the E seam in the <br />future. <br />7. Figure 2.8.5.A was outdated and was therefore deleted. The reference to <br />Figure 2.8.5.A on page 2-531 has been changed to Figure 2.8.A.6, <br />"Comparison of Projected and Actual Mine Inflows", which contains current <br />inflow data and replaces the deleted diagram. The Table of Contents <br />reference has also been corrected. <br />