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Groundwater Monitoring & Response Plan <br />3.5 Equipment Decontamination <br />The following decontamination procedure will be used on equipment prior to the field visit and <br />between water level measurements at different wells if contamination on the probe is observed: <br />• All decontamination will be conducted by field personnel wearing powder -free NitrileTM <br />gloves. <br />• Remove gross contamination from equipment by brushing or wiping with clean cloth or <br />paper towels. <br />• Wash and scrub equipment with phosphate -free detergent solution, e.g., AlconoxTM or <br />equivalent. <br />• Rinse equipment with distilled water. <br />• Air -dry or wipe equipment with clean paper towels. <br />• Any equipment/instrument (e.g., electronic water level indicator tape) inserted in a <br />domestic well will be decontaminated as described above and rinsed /wiped with a 10- <br />percent bleach solution immediately prior to placement in the well. <br />3.6 Data Review and Management <br />All field logbooks will be stored in secure, organized files and electronic databases. Depth to <br />water measurements and data collected using the continuous water level recorders will be post - <br />processed and converted to water level elevations. Once processed, the data will be examined to <br />assess the potential threat(s) of the observed drawdown response to wells in the vicinity of the Pit <br />and to ensure timely implementation of measures, as necessary, to minimize the threat(s). The <br />data will also be used to refine the numerical groundwater model and improve the ability of the <br />model to forecast water level changes in response to dewatering at the Pit. <br />4.0 RESPONSE PLAN <br />The goal of the response plan is to identify and mitigate potential impacts to water well users <br />before such impacts are actually experienced by the well owners. Because the potential for well <br />impacts is not only dependent on water level changes but also a number of well - specific factors, <br />impact assessments must be considered on a well by well basis. Well- specific factors affecting <br />assessment of potential impacts include well depth, pump set depth, well yield, and observed <br />water level drawdown in response to pumping. As a result, no set criteria are established as <br />response triggers applicable to all wells. Alternatively, water level monitoring data will be used in <br />Western Water & Land, Inc. 8 <br />