Laserfiche WebLink
• Surface water Monitoring. SCC has developed a network of surface water monitoring sites <br />at a water rights augmentation structure discharge site (Pond Y-1), and in the drainages <br />of Sage Creek, Grassy Creek, and Annand Draw (tributary to Scotchman's Gulch). As future <br />sediment control ponds are installed, SLC anticipates the addition of five new NPDES <br />monitoring sites. Monitoring instrumentation, parameters, end monitoring frequencies are <br />described in detail in Teb 15, Hydrologic Monitoring Program. Surface water monitoring <br />sites will be maintained for the life of the mining operation or until such time as CDNG <br />may agree that they ere no longer necessary. All surface water monitoring installations <br />will be removed upon completion of the postmining phase of the Hydrologic Monitoring <br />Program. <br />All surface water data collected at each monitoring site in each future water year will <br />be compiled end submitted to the CDMG in [he form of the Yoast Annual Hydrology Report <br />(AHR) by March 1 following the end of each water year. Future AHR's will include copies <br />of quarterly NPDES discharge monitoring reports for each NPDES monitoring site submitted <br />to the Colorado Department of Health during the same year. <br />• Stream Buffer Zones <br />Section 4.05.18 of the Colorado Surface Coal Mining Reclamation Act (5/94 revision) <br />prohibits disturbance within 100 feet of a perennial stream or stream with a biological <br />community. Stream channel disturbance proposed during the first five-year period at the <br />Yoast Mine is limited to three stream crossings (culverts) along Annand Draw and one <br />stream crossing of Scotchman's Gulch by Haul Roads B and A, respectively (see Exhibit <br />13-2). No other disturbances within the 100-foot buffer zone along both drainages are <br />proposed. Flow behavior in Annand Draw and Scotchman's Gulch is predominately ephemeral, <br />with the qualifier th of during the snowmelt season, significant bank storage may allow <br />intermittent flow in some reaches to occur from March into late June. No significant <br />biological communities ere present within the stream reaches proposed for installation of <br />the haul road crossing. Regardless, the haul road crossings are designed and will be <br />constructed to minimize disturbance to each reach. <br />The three crossings of Annand Drau (Exhibit 13-2) will be comprised of 24-inch CMP <br />culverts riprepped at both the up-and downstream ends. All culverts are designed to <br />• safely pass the 10-year 24-hour runoff event. Bac kfill material proposed for culvert <br />7 <br />