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TAB 13 <br />• <br />Introduction <br />HYDHOL(X;IC M7NITORINC pROGFtAM <br />A ground and surface water monitoring program has been developed to evaluate and aeaeae the <br />existing ground and surface rater system at the Hayden (A~lch Tee;~>>, Inc. (HGT) iti,+M.t <br />facility. Monitoring at the HGT Loadout facility will provide sufficient hydrologic data to <br />assess potential impacts to the system during and after operation of the loadout facility. <br />Monitoring data collected as part of the program is used : 1) to evaluate the accuracy of <br />impacts, if any, predicted in Tab 15, probable Hydrologic Consequences; 2) to determine when <br />monitors may be discontinued or added where they are nee ded: and 3) to der~^^;^~ when the <br />Frequency, number, and type of parameters monitored in the program may be ~Kled. Monitoring <br />data are collected and w^n~yzed following stanaa^+ procedures described in published literature <br />produced by Federal agencies such as the U.S <br />protection Agency. <br />Historic Monitoring Program <br />Geological Survey and the U.S. Environmental <br />• Surface Water Monitoring. Baseline surface water monitoring in the vicinity of the HGT Loadout <br />facility wag conducted by Enviro-Teat Ltd. of Lakewood, Colorado fry 1977 through 1978. <br />Monitoring was conducted along Dry Creek at locations both up- and downstream o£ the loadout, and <br />on Stokes Gulch upstream oP its confluence with Dry Creek. The monitoring data was rnopiled, <br />interpzeted, reported, and ie presented in Attaclment 13-1. <br />A surface water monitoring program xae initiated at the loadvut facility by H-G Coal Compam (H- <br />G) in 1985. Monitoring coneiated of ad^ ^^^ual (spring and fall) monitoring for flow and water <br />quality at two eitea established along Dry Creek. The two sites ware located approximately 1.5 <br />• <br />miles upstream (HGSD1) and .4 miles downstream (HGSD2) O£ the loadout permit boundary. HGT <br />aasumad responsibility for the monitoring program in 1993, and a third stream monitoring site <br />(HGSD3) was established in October, 1993 immediately downgradient of the loadaut in an attempt to <br />T;ze the amount o£ additional ba~cgrvund variability in the water quality data. In addition, <br />HPDES monitoring has been oonch~etad on a weekly basis at two pond outfalls (001 and 002) <br />associated with the spillways of the two sad- tation ponds located at the loadout (ponds 1 and <br />2).LOCatiom of each surface water mor~itorinq site and NPDES out£all are presented on <br />1 <br />~N- o/ <br />Revised 10/97 <br />