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All wells will be installed according to <br />Colorado regulation implementation for <br />monitoring well installation. Water quality <br />samples, aquifer properties and <br />potentiometric levels will be evaluated using <br />4-inch minimum diameter PVC completed <br />monitoring wells. Installation will be <br />performed or directed by a state registered <br />water well installer. Procedures for well <br />installation are provided in Appendix I of <br />this scope of work. <br />We propose to conduct semi-annual full- <br />site ground water sampling and monthly <br />monitoring of field parameters at the bedrock <br />wells. Alluvial wells will have field <br />parameters acquired monthly and quarterly <br />full-site analysis. Results of these activities <br />will allow for definition of the present <br />ground water hydrology and the water <br />quality of the aquifers within the I.orencito <br />Canyon azea. All locations are proposed to <br />allow for continued water quality and water <br />level monitoring to the extent of the life of <br />mine boundary. <br />Purging and sampling of the wells will be <br />done with a bailer. Grotmd water samples for <br />metals will be filtered using a barrel fdter <br />with 0.45 micron filter and will be preserved <br />and shipped according to EPA specified <br />protocols. As the database is developed, <br />constituents which aze consistently below <br />detection limits will be requested to be <br />deleted from the program. Additional <br />groundwater level monitoring will be <br />performed at the time surface flow <br />measurements are made in order to evaluate <br />surface and ground water interrelationships. <br />All full-site water quality samples will be <br />taken according to EPA and regulatory <br />approved sampling protocol. <br />All wells will be designed, constructed <br />and completed to obtain necessary <br />hydrogeologic site chazacterization <br />information in order to construct site specific <br />potentiometric surface maps. These maps <br />will then be used to estimate ground water <br />flow rates and direction. Information <br />collected during the well installation process <br />will include water levels, traasmissivities, <br />aquifer saturated thickness, well yields, well <br />depths and lithology. Detailed long-term <br />aquifer testing is not anticipated at the site. <br />Short term slug tests will be conducted in <br />monitoring wells. <br />The results of continued monitoring will <br />allow for evaluation of the ground water <br />hydrologic system, as well as the ground <br />water quality. Since ground water field <br />parameter sampling will be conducted on a <br />monthly basis, potential changes in water <br />quality other than those resulting from <br />seasonal vaziations will be detected <br />immediately. <br />The proposed ground water monitoring <br />program will describe the hydrogeologic <br />regime, augment existing data, establish <br />baseline water quality, water levels <br />(potentiometric surfaces), ground water <br />rechazge and discharge zones and predict <br />ground water flow direction and rates in the <br />overburden, the coal and the underburden. <br />The alluvium along major drainages will also <br />be evaluated for potential flow. Data from <br />these wells will be used to determine if water <br />is available in the shallow alluvial deposits <br />and to determine inherent background water <br />quality characteristics. The potential for sub- <br />irrigation will also be evaluated as part of the <br />alluvial valley floor investigation, if <br />necessary. The final depth of drill holes will <br />be dependent upon actual field conditions. <br />10 <br />