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Colowyo Coal Company <br />2018 Annual Reclamation and Hydrology Report <br />• Upper Collom Gulch (UCG) represents the water quality conditions in Collom <br />Gulch upstream of the Collom Lite mining area. Monitoring has occurred from <br />the 1St quarter of 2011 to 2018. <br />• Confluence of Jubb Creek (CJC) represents the aggregate water quality in the <br />Jubb Creek basin, downstream of potential mining impact areas. Monitoring <br />has occurred from the 1St quarter of 2011 to 2018. <br />• Lower Collom Gulch (LCG) represents the conditions in Collom Gulch <br />downstream of mining impacts. Monitoring has occurred from the 1 st quarter of <br />2011 to 2018. <br />• West Fork of Jubb Creek (WFJC) represents conditions in the Jubb Creek <br />watershed adjacent to the mining disturbance. Monitoring has occurred from <br />the 1St quarter of 2011 to 2018. <br />• Little Lower Collom Gulch (LLCG) represents the conditions in Little Collom <br />Gulch downstream of mining disturbances. Because Little Collom Gulch is <br />ephemeral, and the mining area extends nearly to the headwaters, no upstream <br />monitoring location can be established. As no flow has been observed at this <br />location either during baseline data collection or during the observation period <br />that began 1St quarter of 2011 through 2018, a parameter spreadsheet has not been <br />generated for this location. <br />Ground Water Data - Ground water monitoring sites are comprised of five up dip (or <br />adjacent) and six down dip shallow alluvial wells and are briefly described below (See <br />Maps l0A and IOB in the permit for monitoring locations). One deep groundwater <br />aquifer well is also being monitored: <br />• A-6 Well (A-6) is located south of the mine along State Highway 13, and this site <br />represents up dip, undisturbed or background conditions. Monitoring has <br />occurred from 1984 to 2018. <br />• A-7 Well (A-7) is located south of the mine along State Highway 13 and <br />represents a potential down dip condition below the South Taylor Pit operations. <br />Monitoring started in the second quarter of 2008 and has continued through 2018. <br />• A-8 Well (A-8) is located south of the mine, west of State Highway 13, and <br />represents the condition up -gradient of the South Taylor mining activities. <br />Monitoring started in the second quarter of 2008 and has continued through 2018. <br />• North Good Springs Well (NGSW) is located along State Highway 13 and this <br />site represents the downdip condition below mining activities. Monitoring has <br />occurred from 1989 to 2018. <br />Page 4 <br />