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f III: Ground-Water Conditions In light of community concerns about possible effects of gravel mining on ground water, ground- water level and quality data have been collected quarterly from the network wells since March 1994 in order to initially characterize pre-mining ground-water conditions beneath the permitted mining area and to eventually identify any direct effects of aggregate extraction. Also-, as part of Teichert's approved plan to dry-pit mine, monitoring of the ground-water levels provides the necessary input to establish and maintain a buffer between the base of mining and ground water. Mining of the Lone Tree H parcel began in 1998 and has proceeded to varying depths in different portions of the parcel: to an approximate depth of 80 feet in the initial mined area (now used as a silt pond) and in the current mined area, to date well short of the planned mining depth of approximately 150 feet. The quarterly measurements made during 1994 through early 2001 have been compiled into a table ! of ground-water depths and corresponding elevations in each network well. In addition, ground- water elevation hydrographs for selected wells are presented in this section to illustrate ground-water conditions beneath the area during the last seven years of monitoring activities. Ground-water elevation contour maps for selected periods are presented in this section to further illustrate recent ground-water conditions. A table of the corresponding water-quality results from each well sampled is also presented, as are hydrographs of selected water-quality constituent concentrations in selected wells. Ground-water elevation hydrographs for each network well and the laboratory analytical data sheets for each well sampled during the last year are included in the Appendix. 5 © LUHOORFF 6 SCALMANINI G4NS LI LTI NG ENGINEERS