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<br />1.0 INTRODUCTION <br />1.1 Summary <br />Field studies on the Hayden Gulch Mine. site were conducted in <br />Spring 1977 just after snowmelt,. There was no running water. <br />on the site itself. Stream low was encountered below the <br />Twentymile sandstone outcrop. The quality of this water was <br />similar to that of ground water in the upper reaches ,. but <br />Lower Sage and Dry creeks had much higher concentrations of <br />dissolved solids, sodium, and sulfate. <br />All four of the streams in the study area are dry most of .the <br />year. Except during surface. runoff from snowmelt or rainfall, <br />when they do flow the streams are fed by seepage from aquifers; <br />during these periods the lower reaches of Sage and Dry creeks <br />show increased dissolved-minerals content because of seepage <br />from the Lewis shale. There is no surface water at the mine <br />site except for brief periods of snowmelt or runoff from <br />intense rainfall. <br />1.2 Purpose <br />Surface water was monitored at the site of the proposed Hayden <br />Gulch Mine and transportation corridor to describe pre- <br />development conditions. The monitoring program was designed <br />to comply Leith the rules and regulations of the Colorado Dfined <br />Land Reclamation Board. <br />Undertaken before enactment of the final rules and regulations, <br />the project was designed in anticipation of more stringent <br />regulations than were actually adopted; as a result, the data <br />collected were more detailed than necessary. This will even- <br />tually be to the advantage of W. R. Grace ~ Co. if more detailed <br />data are needed to respond to inquiries concerning project- <br />related impacts. <br />1.3 Scope of Work <br />Under these requirements detailed maps of the area and certain <br />information must be supplied. This information include a plan <br />for managing water from dewatering operations or runoff from <br />disturbed areas, piled material, and operating surfaces to <br />protect against pollution of surface water during and after <br />mining; also required is an estimate of the project water.requi- <br />rements and delineation of the water rights or sources of pro- <br />• ject water and their dependability, both physically and legally. <br />