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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 interfmger 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 a half-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, escribes in <br /> ' detail the regional hydrogeology near the area of interest. Water qualityy to 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 background information are presented in <br /> Appendix A. <br /> 1.2.2 Coal Ash Source 9' T0 S <br /> • o nd a-`aa <br /> Public Service coal comes from a number of Col ado mines in Routt, Moffat, Delta and Gunnison <br /> tcounties. 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, the 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 -T <br /> ' as is the analytical information on the ash. This information has been provided_in our earlier Spas_ <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 /> 1 <br /> 2 <br />