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Subsidence Handbook Volume Ill, Exhibit 15 <br />• Colluvial Deposits -SPRINGS <br />Introduction <br />Colluvial deposits are the source for local springs within the permit area. Typically, these <br />springs are located where there is sufficient overburden thickness for low risk of <br />subsidence cracking. The local springs are in undeveloped states. Some springs are <br />sources for stockponds. <br />Worst-Case Damage <br />Subsidence cracks in the impervious layer below springs could drain groundwater flow. <br />Pre-Damage Monitoring <br />On-site inspections of springs are done at specified intervals. At that time, flow and field <br />parameters of pH, conductivity, and temperature are taken. See water monitoring section. <br />• Water samples are analyzed per DMG approved monitoring parameters at specified <br />intervals. Results are documented, pictures of features taken, and results submitted to <br />DMG in the "Annual Subsidence and Hydrology Report". Additionally, the DMG will be <br />notified within ten (10) days if any subsidence related spring damage is discovered. <br />Any subsidence-induced problems identified bythe water monitorwill be documented. The <br />vast majority of springs have been identified. This is especially true in the first permit term. <br />Post-Damage Monitoring <br />The post-damage monitoring will be the same as pre-damage monitoring. <br />Mining Techniques <br />Longwall orconventional room-and-pillartechniques with pillar extraction will be conducted <br />below Colluvial deposits and associated springs. No alternative method is required. <br /> <br />PR-04 39 10/00 <br />PR-o v <br />