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Baseline Hydrologic Monitoring Plan — Hansen Project 41 <br />4.2.3 Well Development <br />Monitoring wells will be thoroughly developed to remove residual drilling fluids or mud. Well <br />development will be conducted by airlifting from above the screen and surging within the screened zone <br />using a double surge block. The water produced during well development will be stored onsite, <br />characterized, and handled according to appropriate water standards. <br />The supervising hydrogeologist or geologist will <br />Wells will be developed until field parameters <br />discharge water is clear and free of sediment. <br />4.2.4 Reporting <br />monitor the discharge water during well development. <br />(temperature, pH, and conductivity) are stable and the <br />Detailed geologic logs and construction diagrams will be prepared for each new well. The logs will include <br />information on geologic conditions, boring depth, drilling conditions, depth to groundwater, and well <br />construction (depth, screened interval, screen slot size, filter pack type and interval, well seal type and <br />interval, and other pertinent information). <br />Two permit applications for each well must be submitted to the Colorado Division of Water Resources: <br />Form 51 Notice of Intent to Construct Monitoring Hole(s) and Form 46 Monitoring/Observation Water <br />Well Permit Application. Form 51 must be submitted first, and the well must be installed within 90 days of <br />giving notice. Form 46 must be submitted within one year of well completion, along with a $100 filing fee <br />per well. <br />4.3 Permeability Testing Procedures <br />Permeability tests will be performed in each monitoring well after completion to determine the hydraulic <br />conductivity of the monitored formation. Permeability data developed from the tests will be used in <br />characterizing the hydrogeologic system and evaluating impacts from any proposed facilities. <br />Short duration pumping tests will be performed in newly constructed monitoring wells, typically in conjunction <br />with the first round of water quality sampling. Wells that are conventionally purged will be pumped for at least <br />one hour, and drawdown will be measured using an electronic water level sounder and a transducer. Clean <br />purge water that meets groundwater quality standards will be pumped onto the ground. Pumping and water <br />level recovery data will be measured using the Jacob and Theis methods. Other methods of analysis may be <br />used as appropriate. The method of analysis will depend on the characteristics of the aquifer and data <br />developed from the pumping tests. <br />4.4 Monitoring Frequency and Duration <br />Groundwater monitoring will be performed quarterly as shown in Table 14. Baseline water level <br />monitoring in selected wells began in 2008. Baseline groundwater sampling began in fall 2011. New <br />monitoring wells will be added to the sampling program as each well is installed. <br />The quarterly sampling program is designed to monitor seasonal fluctuations in groundwater levels and <br />water quality. Where possible, sampling of groundwater wells will be scheduled to coincide with <br />monitoring of surface water in the area. Typically, the first quarter sampling will occur in March, as soon <br />as all stations are accessible. Second quarter sampling will typically occur in May or June, in conjunction <br />with surface water monitoring. Third quarter sampling will typically occur in August, and 4`h quarter <br />sampling in October or November, while the site is still accessible. The objective of the baseline <br />investigation will be to collect at least five quarters of baseline monitoring data for the Project. <br />4153A.140129 Whetstone Associates • <br />