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SUBSIDENCE HANDBOOK <br /> <br />GF~UNLWATER RESOURCES <br />Introduction <br />C~oundwater within the P-'~saverde formation has been found to tie of limited <br />extent, occurring only as isolated perched water bearing Domes. Zfiese canes <br />are not currently exploited and, because of their limited extent, have no <br />potential for future development. <br />Alluvial deposits have been identified in the Steven's C]~lch Drainage Basin <br />and the Fast Ibatcap area. 'Ifie location of both alluvial deposits are shown <br />on Land Use ptap 9-1. <br />Worst Case Damage <br />Disruption of perched water bearing canes will occur due to mining where <br />they lie in the immediate vicinity of the mine roof. Because of the nature <br />• of this groundwater, this does not constitute any effect on groundwater <br />resources. <br />A subsidence crack in the alluvial deposits could drain this aquifer. <br />Because of alternative mining methods proposed, effects to the alluvial <br />deposits are minimal. <br />Pre-Damage Monitoring <br />CWI proposes construction of shallow monitoring wells in the alluvial <br />deposits. See PHp 4-lA. ?hese shallow monitoring walls will be monitored <br />monthly for water level and field parameters. 'Ihe water quality will be <br />sampled quarterly per CPILRD requirements. <br />CWI has and will continue to monitor mine inflows. 'Ihe localized perched <br />zones typically drain quickly and are of very low flows. Zhis information' <br />is presented in the "Annual 51~bsidence and Hydrology t~port" . <br />• <br />