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Subsidence Handbook Volume III, 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 DRMS approved monitoring parameters at specified <br />intervals. Results are documented, pictures of features taken, and results submitted to <br />DRMS in the "Annual Subsidence and Hydrology Report". Additionally, the DRMS will be <br />notified within ten (10) days if any subsidence related spring damage is discovered. <br />Any subsidence - induced problems identified by the 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 or conventional room - and - pillar techniques with pillar extraction will be conducted <br />below colluvial deposits and associated springs. No alternative method is required. <br />PR -14 41 03/14 <br />