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3 <br /> at a distance determined by: <br /> • classified groundwater or surface water use that could be <br /> affected by contamination from the source; <br /> • geohydrology of the site, such as depth to ground water, <br /> ground water flow direction and velocity, soil types, surface <br /> water impacts, and climate; <br /> • the toxicity, mobility and persistence of potential <br /> contaminants; <br /> • the potential of the site as an aquifer recharge area; <br /> • recommendations of the operator, including technical and <br /> economic feasibility. In establishing the state-wide interim <br /> narrative standard for ground water quality, the Water Quality <br /> Control Commission noted that even very substantial <br /> expenditures may be economically reasonable when necessary to <br /> protect public health or important environmental resources. <br /> Ground Water Monitoring: <br /> 1. A ground water monitoring program shall be required on a case-by- <br /> case basis where an adverse impact on ground water quality may <br /> reasonably be expected. <br /> 2 . If ground water monitoring is required, the operator shall include <br /> the following information in a permit modification: <br /> C a map showing ground water sample points and any locations <br /> proposed as points of compliance; <br /> monitoring well completion data; <br /> 0 method of sampling and frequency of sampling and reporting to <br /> the DMG; <br /> parameters, methods, and quality assurance/quality control of <br /> analyses; <br /> 0 formations, aquifers or strata to be sampled; <br /> 0 identification of potential contamination sources; <br /> 0 timetable for implementation of the monitoring program; <br /> 0 ambient ground water quality data sufficient to characterize <br /> potentially impacted ground water quality. <br /> Ground Water Regulations of the Water Quality Control Commission <br />