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CGRS, Inc. <br />' documented by Colton, 1978, varies between wind blown deposits of clay, silt and sand and sandy <br />' to gravelly alluvium, which are Holocene in age. Colluvium consisting of bouldery to pebbly sandy <br />silt and clay may contain and interfinger with alluvium of various ages. <br />' The depth to groundwater at the site generally varies between three and ten feet below ground <br />' surface (bgs). The inferred groundwater flow direction is to the northeast roughly parallel to the St. <br />Vrain River drainage. <br />' Water well records obtained from the Colorado Division of Water Resources indicate that one well <br />' may be located within one quarter mile of the proposed test plot. The registered well owner is <br />Dakolios Construction and the permitted use of the well is industrial. The location of registered <br />wells within ahalf--mile radius of the proposed test plot are depicted on Figure 2. Field verification <br />of well locations and construction details, if available will be performed prior to project start-up. <br />' Groundwater quality data for the immediate study area are limited. Reeder, 1993, describes in <br />' detail the regional hydrogeology near the area of interest. Water quality data for 36 domestic wells <br />completed as bedrock aquifers (Larimie-Fox Hills Formation) in the Milton Reservoir were <br />' compiled by Reeder. A review of water quality data indicate that all wells sampled exceeded water <br />quality standards for total suspended solids and a large percentage exceeded standards for pH. <br />Field and analytical data documented by Reeder and other backgound information are presented in <br />Appendix A. <br />' 1.2.2 Coal Ash Source <br />Public Service coal comes from a number of Colorado mines in Routt, Moffat, Delta and Gunnison <br />' counties. These mines include West Elk, TwentyMile, Powderhorn, and ColoWyo. This coal is <br />normally purchased under long term contracts, which specify certain analytical parameters. <br />' Therefore, [he chemical and physical properties of the coal (and resulting ash) do not change <br />significantly from year to year. Analytical information for each of these coal sources is available <br />' as is the analytical information on the ash. This information has been provided in our earlier <br />submittal. Comparisons of analytical data completed in the early 1990s with recent data indicate <br />' little variation in any of the ash constituents. <br /> <br />' 2 <br />