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;~ of the original work done by VTN and Colorado-OSM regulations, seven <br />new monitor wells were deemed necessary. The information obtained <br />utilizing these wells coupled with VTN's preliminary information will <br />meet the required regulatory prerequisits to define the subsurface <br />hydrologic resource. M-K installed the wells based on information <br />presented by VTN and other geologic sources. <br />4.2.2 Well Installation <br />A total of seven wells were installed. Three of these wells were <br />perforated in the upper group of coal seams of four wells were perforated <br />in the lower most coal seam. The wells were drilled with air and cased <br />with two inch PVC pipe. The drilling depth was monitored by recording <br />cuttings characteristics. 6Jhen the coals were perforated, a set of <br />geophysical logs were run to identify the specific depth of each coal <br />zone (see Exhibits 10 through 16). Based upon the geophysical logs, <br />the well casing and perforated zones were set. Lithologic logs for <br />each borehole are presented in Exhibits 45 through 49. <br /> <br />Each well was cemented at the bottom, gravel packed through the perfor- <br />ated zone, and then cemented to the surface (see Exhibits 17 through 21 <br />for well construction details). With the exception. of dual completion <br />well LC 2, UC 2 and single completion well LC 4, only minimal amounts <br />of water were encountered. Bore hole LC 2, UC 2 produced a moderate <br />amount of water starting at about eight feet (see the resistivity curve <br />on Exhibit 12) and well LC 4 produced water at approximately 15 feet. <br />Based on further analysis the origin of the shallow water presence is <br />due to mine pit drainage in well LC 4 and a shallow sandstone wedge in <br />well LC 2, UC 2. Each well was blown out after the cement had a chance <br />to set and allowed to stabilize prior to any water monitoring. <br />4.2.3 Groundwater Monitoring <br />A sampling schedule was has set up which has produced the data needed <br />to generate hydrographs and provide baseline water quality assessment. <br />• To this point, 4 water quality sampling and 12 monthly static water <br />level measurements have been conducted. The water levels have been <br />22 <br />_,i:~e <br />