Laserfiche WebLink
Pit Fill Ditch and down to the West Pit Pond. Finally, parcel WP009 drains into the Taylor <br />Tributary Ditch before reaching the East Taylor Pond. All associated ditches were well established <br />and protected with rip rap and no issues were observed. The Division is not proposing to release any <br />portion of the East Taylor Pond Ditch, West Pit Fill Ditch or the Taylor Tributary Ditch with SL -10. <br />During the bond release inspection in September 2016, the SL -10 partial Phase III Bond Release <br />areas in the East and West Pit areas were all inspected to ensure that they have met the requirements <br />for drainage control reestablishment. The following ditches were inspected for SL -10: Gulch A <br />Ditch, East Side Collection Ditch, East Taylor Pond Ditch and Taylor Tributary Ditch. All ditches <br />mentioned in this document are excluded from the SL -10 area because they receive runoff from <br />areas in the SL -10 area as well as areas not included in the bond release area. <br />Other diches in the East and West Pit area were not inspected during the bond release inspection, <br />but they have been inspected previously by the Division and have been found to be in good <br />condition. These were also excluded from the SL -10 area because they receive runoff from areas in <br />the SL -10 area as well as areas not included in the bond release area. <br />Hydrologic Balance - Evaluation of Hydrologic Impacts Required by Section 3.03.2(2) <br />Rule 3.03.2(2) requires the Division to evaluate hydrologic impacts prior to releasing reclamation <br />lability. This evaluation must consider whether pollution or surface or subsurface water is occurring <br />and the probability of future occurrence with such pollution. The Division's evaluation is <br />summarized below. <br />Ground Water Impacts <br />Colowyo maintains three wells in the surrounding area of the SL -10 reclamation parcels that have <br />been monitored: the North Good Spring Well, the Gossard Well and A-6 Well. The A-6 and <br />Gossard Wells represent the ground water conditions up and downgradient from the mining areas <br />while the North Good Spring Well represents conditions immediately below the mining area in the <br />East Pit. <br />The North Good Spring Well is an alluvial well located immediately down gradient of the SL -10 <br />parcels in the East Pit area. Observations of the data from the well indicate that over time, water <br />elevations have slightly decreased beginning around 2003 as shown in Figure 4 of the SL -10 <br />application. However, this slight decreasing trend coincides with the reclamation period for the East <br />Pit parcels as well as predictions within Colowyo's PAP. It was also observed in the North Good <br />Spring Well that over time TDS and conductivity has increased slightly as well. However no <br />concentrations of analytes, including TDS, have increased to levels that are cause for concern and <br />are within the range predicted within Colowyo's PAP. <br />In the West Pit area there are no alluvial wells in the vicinity of the former pit and SL -10 <br />reclamation area. Per initial Colowyo hydrology reports (e.g., the PAP includes a 1979 report by <br />Leonard Rice Consulting Water Engineers), there was never a significant possibility of groundwater <br />Proposed Decision and Findings of Compliance January 2017 <br />Partial Phase III Bond Release SL -10 Page 6 <br />