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A conservative estimate of the expected effect of mining indicates that no material <br />damage will result. <br />In addition to water quality degradation, another type of material damage that can occur <br />to an AVF is physical disruption of the AVF's capability for irrigation or subirrigation <br />(the AVF's essential hydrologic function). PSCM does not propose excavations in the <br />Fish Creek, Grassy Creek, or Little Grassy Creek AVFs; therefore, the essential <br />hydrologic functions of these AVFs will not be physically disrupted. PSCM will <br />monitor discharges to the Grassy Creek and Little Grassy Creek AVFs at pond 002 and <br />will monitor discharges to the Fish Creek AVF at pond 004. PSCM will monitor <br />alluvial ground water in the Grassy Creek AVF in well YSG5 and in the Little Grassy <br />Creek AVF in well SGAL71. PSCM will monitor surface water in the Fish Creek AVF <br />at SSC10. <br />The Division finds that activities proposed by the applicant will not interrupt, <br />discontinue, or preclude farming on the alluvial valley floors that are irrigated or <br />naturally subirrigated. <br />(4.24.3(1)). <br />The proposed activities will not materially damage the quantity or quality of water in <br />the surface or ground water system described above (4.24.3(3) and 2.06.8(5)(a)(ii)). <br />The proposed activities will comply with the requirements of the Act and the <br />Regulations with respect to alluvial valley floors. (2.06.8 (5)(a)(iii)). <br />An environmental monitoring system for alluvial valley floors has been installed, will <br />be maintained and operated by the permittee during surface coal mining and <br />reclamation operations, and will be continued until all bonds are released in accordance <br />with Rule 3. (4.24.4). <br />Those areas of the operation in the Grassy Creek or Little Grassy Creek watersheds <br />where only surface coal mining activities were conducted produced coal in commercial <br />quantities and were located within or adjacent to an alluvial valley floor prior to August <br />3, 1977 (4.24.3(4)(a) and 2.06.8(5)(b)(I)(A)). <br />25 <br />