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<br />Mr. Jason Musick <br />August 31, 2010 <br />Page 2 <br />bicarbonate water types, moderate TDS concentrations (600 to 900 mg/1) and alkaline <br />pH. 'The sodium bicarbonate water type is typical of groundwater in areas farther along <br />the deeper portion of the groundwater flow path and more distant from natural recharge <br />areas. <br />• The recent isotope analyses of samples collected at COV23 show groundwater at this <br />location within the PSCM reserves is greater than 1.15 million years old, indicating <br />groundwater movement at these depths in the formations that comprise the basal <br />Williams Fork aquifer is minimal. Groundwater is likely of similar age or even older in <br />these same units further and deeper to the northwest within the synclinal basin where the <br />monitoring well is proposed to be constructed. <br />The key sandstone beds above the Wadge coal seam below the Lennox Coal have been correlated <br />successfully across the PSCM permit area, and reveal a relatively uniform interburden between <br />the Lennox coal seam and lower Wadge coal seam over an area of about 8 by 8 miles square. <br />PSCM anticipates groundwater information collected at the proposed location will feature similar <br />water level seasonality and water quality as seen at COV23 and CW23, and will provide <br />sufficient baseline groundwater information representative of the bedrock units down-gradient of <br />all possible mining activities at the PSCM. This additional bedrock well will provide sufficient <br />water level data to expand the extent of the potentiometric surfaces in both the Wadge Coal and <br />Wadge Overburden through the northwestern portion of the PSCM permit area. <br />I've also attached a recommended well construction diagram for installing a monitoring well at <br />the proposed location at ccu039 as shown on the location map. Please don't hesitate to contact <br />me via phone at 929.913.9218 or by email at jcochran@peabodyenergy.com if you have any <br />questions. <br />j S' c ely / <br />LAXLA\ <br />hn Cochran <br />Manager Environmental Hydrology <br />Peabody Investments Corporation <br />C: Tom Kaldenbach (CDRMS) <br />Scott Cowman (PSCM) <br />Vern Pfannenstiel (PIC)