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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 1986 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 1996 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 walls <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 /> i <br />N <br />i <br />i <br /> stor <br />c <br />ames or Descr <br />H <br />ptions 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 HGS D3 <br /> Upgradient Shallow HGDALI <br /> Downgradient Shallow HGDAL2 <br /> "Replacement" Downgradient Alluvial Well HGDAL3 <br /> CDP3 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 12 and 13 depict the locations of all <br />monitor sites and include HGTI's ZD 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 5 Revised OS/OS <br />