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Changes in natural discharge of groundwater to the surface system are not apparent from review <br />of the data. Induced recharge caused by subsidence may be occurring, especially at the <br />intersection of the Twentymile sandstone and Foidel Creek, which has been subsided and <br />fractured. However, stream flow and alluvial water level data do not indicate a discernable water <br />loss, indicating induced recharge is likely minimal. <br />Subsidence Impacts on Foidel and Middle Creeks <br />The PHC predicts stream gradient changes caused by subsidence in Foidel Creek and Middle <br />Creek. These gradient changes will result in areas of ponding with corresponding adjacent areas <br />of stream erosion. As a result of mining in Panels 7, 8, and 9 in the EMD, four areas of ponding <br />have developed along Foidel Creek, resulting in 5 acres of flooded area alone the valley bottom. <br />Any increase in sedimentation is not evident based on site 900 water quality data downstream of <br />this subsided area. General water qua]iry changes are not apparent. Observed impacts are in line <br />with predicted impacts. <br />Please review our comments and call if you have any questions. For those questions where a <br />response is required, the Division requests that you provide responses no less than 45 days from <br />receipt of this letter. <br />Sinc~ eFel~~~~ <br />~1/lp,H_/ '~i~ <br />Kent A. Gorham <br />Environmental Protection Specialist <br />CC: Dan Hernandez, DMG <br />Janet Binns, DMG <br />