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Subsidence Handbook Volume III, Exhibit 15 <br />0 Surface Water Resources - PONDS & STREAMS <br />Introduction <br />Surface water resources within the permit area consist of stockponds and perennial, <br />ephemeral and intermittent streams. These resources should not be affected by changes <br />in surface gradient or total subsidence resulting from development of a subsidence profile. <br />Stockponds and streams were identified during a hydrologic reconnaissance of the permit <br />area. <br />Worst Case Damage <br />The ponds could be damaged and drained by a subsidence crack that would occur directly <br />below the pond. Flow through ephemeral and intermittent drainages could temporarily be <br />effected by a subsidence crack across a stream channel. <br />Pre - Damage Monitorinq <br />• On -site inspections of significant ponds are done during hydraulic monitoring. At that time, <br />field parameters of pH, conductivity, and temperature are taken. See water monitoring <br />section. Water samples are analyzed per DMG approved monitoring parameters on a <br />approved schedule. Results are documented, pictures of features are taken, and results <br />submitted to DMG in the "Annual Subsidence and Hydrology Report". Stream channels <br />will be monitored as persons travel throughout the permit and adjacent area during <br />scheduled environmental resource monitoring. Additionally, the DMG and the surface <br />management agency will be notified within 48 hours if any subsidence related pond or <br />stream channel damage is discovered. <br />Any subsidence - induced problems identified by the environmental resource monitoring will <br />be documented. All of the ponds are presumably used by wildlife. <br />Post - Damage Monitoring <br />The post- damage monitoring will be the same as pre- damage monitoring. <br />Mining Techniques <br />• Longwall or conventional room - and - pillar techniques with pillar extraction will be conducted <br />TR -65 36 02/10 <br />AFPRavco <br />( 06/I o <br />