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<br />" <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />. Drilling will commence when access is available and weather conditions are suitable. <br />Drilling is expected to be with mud rotary techniques. <br /> <br />. This well is estimated to be a maximum of 400 feet in depth and will be completed in the <br />uppermost bedrock aquifer that is present. <br /> <br />. The borehole will be near an alluvial well from Task 35, so sample collection will not <br />commence until bedrock is reached. The uppermost 25 feet of the bedrock formation will <br />be cored using a minimum 2-inch core barrel. The borehole will then be reamed and <br />advanced to the uppermost aquifer using a rotary bit, with cuttings descriptions used to <br />define the geology. <br /> <br />. When the uppermost aquifer is encountered, as identified by the onsite field geologist or <br />engineer, an additional 10 feet of core within the aquifer will be collected. <br /> <br />. At the completion of drilling, a suite of geophysical logs including, at a mmmlUm, <br />resistivity, natural gamma and SP will be run to assist in hydrostratigraphic <br />characterization. <br /> <br />. Materials encountered in each borehole will be visually classified and described by a <br />qualified geologist or engineer from either cuttings or the cores. The Consultant's on-site <br />representative will maintain a log of all significant well construction and testing activities. <br />Cores will be photographed for additional documentation and stored in waterproof <br />cardboard core boxes. <br /> <br />. Laboratory testing of vertical permeability will be conducted on 2 samples of <br />representative lithologies from the upper core run, while 2 horizontal permeability tests <br />will be conducted on samples from the core in the uppermost aquifer. The objective of the <br />vertical permeability assessment in the upper bedrock interval is to assist in determination <br />of vertical leakance characteristics, while the horizontal permeability is to determine <br />hydraulic properties of the bedrock aquifer. <br /> <br />. Drilling mud and cuttings will be disposed of off-site. The site will be graded and a <br />dryland seed mix spread. <br /> <br />· The well will be completed with 4-inch pve casing and a screen length of no more than <br />40 feet. Well completion will be in accordance with State regulations. <br /> <br />. The well will be developed by surging and pumping and the produced water discharged to <br />the surface. <br /> <br />. A surveyor licensed in the State of Colorado will be selected and sub-contracted to <br />provide vertical and horizontal coordinates using precision differential GPS methods. <br /> <br />. A single-borehole aquifer performance test will be conducted after each well is completed <br />and developed Large capacity wells within 2000 feet will be checked to verity that they <br />are not pumping. Pumping will be conducted at a sustainable constant rate for a period not <br />greater than 8 hours. Water from testing will be discharged to overland flow or nearby <br />surface water bodies without treatment or chemical testing. It is assumed that nO permits <br /> <br />SPDSS Groundwater SOW, Phase I <br /> <br />Page 24 <br />