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• Ru(c 2: Permits <br />confined and the range of these values is generally 103 to 10~ (Heath, 1983). Bailing of the well <br />during the acquisition of field chemistry pazameters indicates that the hydraulic conductivity in this <br />layer is extremely low, since water production from the well is limited. The potential production <br />of water from this zone for domestic water would be characterized as poor to infeasible. <br />Cirue/a Coal <br />The Ciruela coal in the Lorencito Canyon Permit azea outcrops at approximately 7200 feet AMSL. <br />The outcrop is considered the downgradient extent of this unit for hydrologic analyses. Total <br />estimated thickness for this unit ranges from 0 to 5.9 feet with an average thickness of 3.56 feet. <br />Recharge to the Ciruela is via precipitation on outcrop surfaces, and from inflow from fractures <br />or overlying units. Infiltration rates for this unit are anticipated as low. <br />Examination of a flow net of the system indicates that some of the recharge is discharged at the <br />outcrop surface area via evapotranspiration. In addition, springs would generally be anticipated <br />to emanate for the coal at the outcrop. Spring and seep surveys conducted during the baseline <br />period did not determine springs to exist at this particular outcrop area. This may be the result <br />of small amounts of recharge combined with the high evapotranspiration in the area. <br />Groundwater in the Ciruela is characterized as being under confined conditions. Water was not <br />• apparent in any of the borings into the overburden; however, wells were set into the Ciruela. Well <br />MW-2 has been dry and no well was set in the Ciruela at the location for MW-3 due to dry <br />conditions. Water was present in only one well installed in the overburden (MW-1C). <br />Groundwater in the Ciruela appears to be intermittent throughout the zone; therefore the <br />potentiometric surface could not be determined. <br />The characteristics of the Ciruela water-bearing zone were determined via slug testing. A slug test <br />was performed in well MW-1C, and recovery of the well to static water level required <br />approximately 16 hours of data collection. This indicates low hydraulic conductivity for the <br />Ciruela. Estimated hydraulic conductivity as determined via this testing was 1.37 ft/day. <br />Storativiry estimated by this method (Cooper, Pappadapoulous) was 2.14 x 106. The hydraulic <br />conductivity determined was also within the same order of magnitude as the value determined by <br />Howard (1982) for the Raton Formation coals. Utilizing the hydraulic conductivity, and a coal <br />thickness of 5 feet (MW~C well, saturated thickness), the transmissiviry can be derived as: <br />T=Kb <br />T = (1.37 ft/day) (5 ft) <br />T = 6.85 ft~/day or 51.23 g/d/ft <br />This value is within the range characteristic of a coal unit and compares favorably to the values <br />in the study by Howard (1982). <br />• <br />PERMIT.~]5lpcxmbet Z0, 1996 2.04-14 <br />