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<br />., <br /> <br />. <br /> <br />. <br /> <br />. Drilling and well installation will be sub-contracted to a qualified drilling contractor who <br />is licensed for this work in the State of Colorado. Different contractors may be selected <br />for different areas to minimize mobilization costs, A maximum of 3 drilling sub-contracts <br />for the 15 wells are estimated. <br /> <br />. Drilling will commence when access is available at all sites and weather conditions are <br />suitable. <br /> <br />. All alluvial wells will be constructed using hollow-stem auger equipment without use of <br />drilling fluids. <br /> <br />. All boreholes will be drilled to bedrock, with an estimated maximum depth of80 feet, and <br />an average depth of 60 feet. <br /> <br />. Drill cuttings will be disposed of at the site by spreading on the site and leveling, if <br />compatible with the land-use and acceptable to the owner. If required, the cuttings will be <br />disposed of as fill at an appropriate location. Disturbed areas will be re-seeded with a <br />dryland mix, if necessary. <br /> <br />. Each borehole will be continuously sampled and visually classified and described by a <br />qualified geologist or engineer. Selected samples will be retained for geotechnical <br />analysis, consisting of grain size determinations by the wet-sieve method at a maximum of <br />4 intervals per well. Cores will be photographed for additional documentation. <br /> <br />. The Consultant's on-site representative will be present for all drilling activities and <br />maintain a log of all significant well construction and testing activities. <br /> <br />. All wells will be drilled to bedrock and completed with up to a 20-foot screen interval <br />selected in the field by the Consultant, based on the lithologies encountered. <br /> <br />· Wells will be constructed of 4-inch PVC with a mill-slotted screen up to 20-feet long. <br />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 verify 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. Permits for discharge of water <br />from the perfonnance testing will be obtained from the Colorado Department of Health <br />and Environment prior to starting the performance tests. Water level data will be recorded <br />during the pumping and recovery phases using a pressure transducer and data logger. <br />Aquifer performance testing results will be reduced and interpreted using industry <br />standard graphical analysis techniques based on the Cooper-Jacob method of analysis. <br /> <br />SPDSS Groundwater SOW, Phase I <br /> <br />Page 21 <br />