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SUBSIDENCE HANDBOOK <br />• <br />SURFACE WATER FESOURCES <br />Introduction <br />Surface water resources within the permit area consist of stockponds and <br />surface streams. These resources should not be affected by changes in sur- <br />face gradient or total subsidence resul ting from development of a subsidence <br />profile. <br />Stockponds were identified during a hydrologic reconnaissance of the permit <br />area. Only the Fast Fd~atcap Creek and Steven's Oilch are endangered by sub- <br />sidence cracks. <br />Worst Case Damage <br />The ponds could be damayed attd drained by a subsidence crack that would <br />occur directly below the pond. The probability of such an event is very <br />• low. <br />East fi~atcap Creek and Steven's cl~lch streamflow could be disrupted by sub- <br />sidence cracks. West I~atcap Creek and Terror Creek stream channels are not <br />undermined, so subsidence cracking is not possible. The loss of stream <br />run-off flow utilized for irrigation ceuld affect crop production. <br />\~~~ ~ J <br />\" <br />Pre-Damage Monitoring <br />On-site inspections of significant ponds are done on /a monthl~is. At <br />that time, size and field parameters of pH, electrocon uctivity,~ d temper- <br />ature are taken. See monitoring report attached. \ Water samples are <br />analyzed per CMLRD approved monitoring parameters on a quarterly basis. <br />Resul is are documented, pictures of features taken, and results submitted to <br />CMLRD in the "Annual Subsidence and Hydrology Report". <br />Surface users of significant ponds will be notified six months prior to <br />• undermining. Any subsidence-induced problems identified by the surface <br />user will be documented. ~e vast majority of ponds are used by CWI. <br />