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The majority of the ground and surface water monitoring conducted by HGCC was <br />- performed after the last of the coal stockpiled at the Loadout facility was shipped <br />out in 1986. From 1936 through 1992, the Loadout was inactive and all coal <br />storage, handling, and shipping activities were discontinued. Therefore, the data <br />collected from 1987 through 1992 was only minimally influenced by the small amount <br />of coal remaining on site (coal stockpile leachate) or activities associated with <br />the Loadout, and may be considered to reflect natural conditions. During 1990 and <br />1995, HGTI shipped approximately 170,000 tons of coal in 17 trains. A minimal <br />amount of coal remains in the loadout stacker stockpile. <br />HGTI formally abandoned monitor wells HGDALI and HGDAL2 during 2005. The wells <br />were abandoned in accordance to the rules and regulations of the Colorado Division <br />of Water Resources. <br />Monitoring Site IDs. Different monitoring site name identifiers have been <br />established for all historic monitoring sites, as well as the new stream and <br />alluvial well monitoring sites. The following list provides the names (IDs) <br />utilized by HGTI and any corresponding historic names used. <br />C Historic Names or Descriptions HGTI Site IDs <br />Upstream Surface Water Monitoring Site HGSD1 <br />Downstream Surface Water Monitoring Site HGS D2 <br />"Replacement" Downstream Surface Water Monitoring Site HGSD3 <br />Upgradient Shallow HGDALI <br />Downgradient Shallow HGDAL2 <br />"Replacement" Downgradient Alluvial We21 HGDAL3 <br />"New" Upgradient Alluvial Well HGDAL4 <br />CDPS Outfall OOlA (Truck Loop Pond) Truck Loop Pond <br />CDPS Outfall 002A (Rail Loop Pond) Rail Loop Pond <br />Exhibits 12-1, Facilities Map, 12-2, Surface Water Control Plan Map, and Figure 13- <br />1, Monitoring Site Location Map, in Tabs I2 and 13 depict the locations of all <br />monitor sites and include HGTI's ID designations. <br />Operational Monitoring Program <br />(\' Monitoring Rationale and Methodology. Considerable discussion occurred between <br />`~- HGTI and CDMG staff regarding monitoring approaches, sites, and frequencies in <br />TR-06 <br />5 <br />Revised 06/05 <br />-a.-. ~„~ z ~ +s..e <br />°__ .... <br />~ ~~:_ <br />