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October 19, 2017 <br />Table 2. Pilot Test Pumping Schedule used in Calibration <br />Start Time (day) End Time (day) Pumping Rate (gpm) <br />0 3 14 <br />3 8 13 <br />8 27 12 <br />27 37 11.5 <br />37 60 0 <br />Page 9 <br />Several approaches to defining and modifying hydraulic parameters were taken during <br />the calibration effort. The successful involved using initial estimates for hydraulic conductivities <br />of various coal and non -coal layers that were based on direct computations performed by WMC <br />based on their field investigations and observations. AAI performed spot checks on numerous <br />WMC well -test calculations and found the computed conductivity values to be reasonable and <br />representative of the ground response to the field tests. Hence, these values formed the initial <br />values for AAI's calibration analysis. AAI performed numerous calibration iterations, adjusting <br />the hydraulic conductivities and storage coefficients of multiple coal and non -coal layers <br />simultaneously to find the best fit between modeled and observed draw-down/rebound responses. <br />A summary of the calibrated hydraulic conductivities and storage coefficients by layer is <br />presented in Table 3. Note that the Km bed and its underlying layer were excluded from the <br />calibration process because they were unlikely to be consequential to the dewatering process. <br />These calibrated parameters formed the core of AAI's interpretations of the dynamic ground <br />response to a pumping effort and were used in the predictive analyses that followed. The <br />hydraulic parameters were assumed to be constant throughout the modeled area. A summary of <br />the measured hydraulic conductivities reported in WMC's 2005 study is presented in the <br />Appendix. <br />Table 3. Summary of Calibrated Hydraulic Parameters <br />Agapito Associates, Inc. <br />Kx <br />Ky <br />KZ <br />Ss <br />Simulated Layers <br />Brief Descriptions <br />(ft/day) <br />(today) <br />(today) <br />(per ft) <br />1 <br />Surface to top of Dl Seam <br />0.01 <br />0.02 <br />0.00014 <br />1.00E-05 <br />2 <br />Top ofDl Seamto bottomofD2 Seam <br />0.2 <br />0.2 <br />0.2 <br />1.00E-06 <br />3 <br />Bottom of D2 Seam to top of E2 Seam <br />0.01 <br />0.01 <br />0.00014 <br />1.00E-05 <br />4 <br />Top of E2 Seamto top of F6 Seam <br />0.01 <br />0.01 <br />0.00012 <br />1.00E-05 <br />5 <br />Top of F6 Seamto bottom of F6 Seam <br />0.2 <br />0.2 <br />0.2 <br />8.00E-06 <br />6 <br />BottomofF6 Seamto top of FA Seam <br />0.008 <br />0.008 <br />0.00012 <br />2.00E-05 <br />7 <br />Top of FA Seamto bottom FB Seam <br />0.2 <br />0.3 <br />0.2 <br />2.00E-05 <br />8 <br />Bottomof FB Seamto top of G7 Seam <br />0.005 <br />0.005 <br />0.00012 <br />5.00E-07 <br />9 <br />Top of G7 Seamto bottomofG9 Seam <br />0.05 <br />0.05 <br />0.05 <br />5.00E-07 <br />10 <br />BottomofG9 Seamto top of GA Seam <br />0.005 <br />0.005 <br />0.00012 <br />5.00E-07 <br />11 <br />Top of GA Seamto bottom GB Seam <br />0.05 <br />0.05 <br />0.05 <br />5.00E-07 <br />12 <br />Bottom ofGB Seamto top of H2 Seam <br />0.005 <br />0.005 <br />0.00012 <br />5.00E-07 <br />13 <br />Top of H2 Seam to top of I3 Seam <br />0.005 <br />0.005 <br />0.00012 <br />5.00E-07 <br />14 <br />Top of I3 Seam to top of J2 Seam <br />0.005 <br />0.005 <br />0.00012 <br />5.00E-07 <br />15 <br />Top of J2 Seamto top of Km Layer <br />0.005 <br />0.005 <br />0.00012 <br />5.00E-07 <br />16 <br />Top of Kmto bottom of Km Layer <br />1.00E_05 <br />1.00E-05 <br />1.00E-05 <br />1.00E-06 <br />17 <br />Bottom of Kin Layerto Model Bottom <br />1.00E-05 <br />1.0013r05 <br />0.2 <br />1.00E-05 <br />Kx Horizontal hydraulic conductivity in N23E (model north -south) direction <br />Ky: Horizontal hydraulic conductivity in N67W (model east -west) direction <br />Kx Vertical hydraulic conductivity <br />Ss: Storage coefficient <br />Agapito Associates, Inc. <br />