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CGRS, Inc. <br />deposits in this area. The depth to bedrock in this area as documented by field observation varies between <br />15 and 30 feet below ground surface. <br />A United S[a[es Geological Survey investigation documented groundwater occurrence and movement near <br />the study azea. Underflow calculations in the vicinity of the study area indicate that 600 acre-feet of water <br />passes across a two mile section of the alluvial valley. If the average depth to bedrock varies between 20 and <br />30 feet below ground surface then the average hydraultc conductivity is calculated to vary between 97 and <br />147 feet per day. Assuming a hydraulic gradient of 0.0023 fee[ per foot and a porosity of 0.27, the seepage <br />velocity (actual groundwater Flow velocity) is estimated to vary between 0.83 and 1.25 feet per day. <br />Water well records obtained from the Colorado Division of Water Resources indicate that one well may be <br />located within one-quarter mile of the proposed test plot. The registered well owner is Dakolios <br />Construction and the permitted use of the well is industrial. The location of registered wells within ahalf- <br />mile radius of the proposed test plot are depicted on Figure 2. Field verification of well locations and <br />construction details, if available will be performed prior to project start-up. <br />2.0 PILOT STUDY <br />2.1 Protect Start-uu <br />The project start-up will consist of developing a work plan and a site specific Health and Safety plan. All <br />required permits will be obtained prior to conducting the investigation. Utility companies will be contacted ' <br />for the location of all underground utilities prior to commencing investigative activities (telephone, sewer, <br />electrical, cable television, natural gas lines, oil and gas pipelines, bused tanks and wells). <br />2.2 Hydrolo2y Determinations <br />A site-specific investigation will be conducted prior to pilot project. We anticipate that between three and <br />four groundwater monitoring wells will be installed to determine local hydrology and water quality. The <br />investigation at a minimum will determine local groundwater flow direction and rate, sot! conditions, <br />porosity and hydraulic conductivity. Groundwater quality will be determined by obtaining water samples <br />From one monitoring well on a quarterly basis until the ash placement is completed. Analytical parameters <br />will be identical to those presented in the column-leaching test. At least hvo samples will be analyzed prior <br />to the pilot project. The results of [he investigation will be presented in a report to all interested panics for <br />approval. It is anticipated that up to ten wells will be installed to monitor variations in local aquifer <br />characteristics as a result of coal ash burial. <br /> <br />