2012-07-09_REVISION - C1981019 - Laserfiche WebLink

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Surface Water Impacts All of the runoff from the SL -05 areas flows into one of the following sediment ponds: Streeter Pond, the Gulch A Pond, or the West Pit Pond. All of these ponds are inspected on a regular basis by the Division as well as CCC. All of these ponds have been found to be in good repair and properly functioning, although routine maintenance is occasionally required. None of these ponds are included in the SL -05 Bond Release application. Recent Division reviews of AHRs and DMRs indicate that there have been no significant water quality problems at the discharge points associated with these ponds. All three ponds are associated with outfalls in Colorado Discharge Permit System permit number CO- 0045161. Exceedances of discharge limitations that have not been the result of runoff (when alternate limitations were in effect) have been very rare and not indicative of a threat to water quality. There are eight stock tanks located in the Phase III Bond Release area (A, B, C, D, E, F, L and M). CCC has provided written documentation that: • The criteria for permanent impoundments have been met pursuant to Rule 4.05.9(13). • These stock tanks are acceptable to the State Engineer's Office. • The landowner has requested that the stock tanks remain as permanent structures. CCC has submitted a technical revision to the permit to include the stock tanks as permanent structures (TR -89). This technical revision was approved by the Division on March 18, 2011. During the bond release inspection in August 2010, the SL -05 Phase III Bond Release areas in the East Pit were all inspected to ensure that they have met the requirements for drainage control reestablishment. The following ditches were inspected for SL -05: Gulch A Ditch, Section 11 Ditch, the Southeast Tributary to Streeter Ditch, and the Southwest Tributary to Streeter Ditch. Gulch A is excluded from the SL -05 area because it receives runoff from areas in the SL -05 area as well as areas not included in the bond release area. The other ditches have drainage areas entirely within the Bond Release area, and these ditches are included in the SL -05 area. No problems were noted with side - cutting along the lengths of the ditches. All ditches were found to meet design criteria, including: • Ditch elevations along the profile • Lateral locations • Cross section dimensions • Riprap size. Other ditches in the East Pit area (including the East Side Collection Ditch, the Streeter South Side Ditch and Streeter Ditch) were not inspected during the bond release inspection, but they have been inspected by the Division at other times and found to be in good repair. These were not included in the SL -05 area because they receive runoff from areas in the SL -05 area as well as areas not included in the bond release area. The portion of the West Pit that is included in the SL -05 bond release area includes portions of the drainage areas for East Taylor Pond Ditch, the West Pit Coal Road Ditch and the West Pit Fill Ditch. However, all three of these ditches also convey flow from areas not included in the SL -05 application and are therefore excluded from the SL -05 Bond Release. As stated by CCC in the response to the Division's review of the 2007 — 2009 AHRs, a limited number of low impact spoil springs are expected to develop occasionally, but the aerial extent of these and the low level of flow (sometimes non - existent flow) will have a very minor impact on