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seuage generated could be from the toilets and this volume is very minimal and variable. <br />Mixing calculations with the Dry Creek streamflou and alluvium are not warranted as [he <br />larger volume coal leachate has previously been demonstrated to no[ be causing measurable <br />water quality impacts. The quantity of seuage leachate potentially generated could be <br />considerably less as: 1) the loadout is no[ continuously operated; 2) only two people are <br />necessary when [he loatlout is receiving coal, and only six people when trains are being <br />loaded; and 3) typical sanitary volumes generated are approximately SO gallons per person <br />(U.S. Public Health Service, 1962, Manual of Individual lJater Supply Systems). <br />Conclusion <br />The above tliscussion and tomput ations should provide sufficient evidence that water <br />quality impacts, if any, from coal stockpile and septic leachate at the HGT loadout are <br />unmeasurable and pose no threat to the ex istin9 water use potential of Dry Creek and the <br />Dry Creek alluvial aquifer. Water quality data collected at the new atluvi al well <br />(HGDAL3) and new stream monitoring site (HGSD3) indicate these monitors will be quite <br />adequate for assessing any future cater quality deg radational trends. <br />Literature Cited <br />Ferreira, R.F. 1984. Simulated effects of surface coal mining and agriculture on <br />dissolved solids in Rosebud Creek, southeastern Montana. USGS Na[er-Resources <br />Investigations Report 84-4101, 60 p. <br />Kircher, J.E., A.F. Choquette, and B.D. Richter. 1985. Estimation of natural s[reamf low <br />characteristics in western Colorado. USGS cote r-Resources Investigations Report <br />85-4086, 28 p. <br /> <br />9 Revised 04/18/94 <br />-fR-GI <br />