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1.0 INTRODUCTION <br /> This report presents the ground-water and surface-water monitoring results for Trapper <br /> Mine for 2019. Mining activities during 2019 include continued expansion of the L pit. All other <br /> pits were not mined during 2019. Pit dewatering was conducted in the L pit in 2019. Well <br /> dewatering was used in 2019 in the G pit area and these volumes of water and pit dewatering <br /> volumes are presented in Table 1-1. <br /> Ground-water monitoring of the aquifers associated with Trapper Mine started in 1974 <br /> and well data for the monitoring wells is presented in Table 1-2. The ground-water flow regime has <br /> been divided into the major sandstones and coal/adjacent sandstone aquifers. This division of the <br /> aquifer systems was selected at clay and shale units, which have the potential to retard vertical <br /> movement. Figure 1-1 presents the schematic of the aquifer units at Trapper and is useful with the <br /> basic well data table in Table 1-2. The monitoring data tabulations presented in Appendices A, B <br /> and C give only the last ten years of data. Appendix D is a CD of this report with all of the historical <br /> monitoring data in its Appendices A, B 34and C. Aquifer properties are presented in Table 2-1 of <br /> the 1990 Annual Hydrologic Report. <br /> The Twenty Mile Sandstone is the first major sandstone below the mined coal seam at <br /> Trapper Mine. The U coal seam and adjacent sandstones is a minor aquifer between the mined coal <br /> seams and the Twenty Mile Sandstone. The Q and R coal seams and sandstone between these two <br /> coal seams have been labeled the QR aquifer. This is one of the major aquifers of interest because <br /> C, D, E, F, G, K, L and Z pits have mined the Q and/or R coal seams, currently the L pit mines the Q <br /> and R seams. The K, L, and M coal seams and the sandstones, which are stratigraphically in this <br /> interval, are called the KLM aquifer. In 2019, the L pit mined the H, H1, H2, H3, I1, 12, I3, K, MK, <br /> LK, ML, M, MM, LM, Q, UQ, MQ and R seams. The KLM aquifer is above the QR aquifer, but <br /> Trapper Mining Company 1-1 <br /> 2019 Annual Report <br />