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... <br />3 <br />at a distance determined by: <br />• classified ground water or surface water use that could be <br />affected by contamination from the source; <br />• geohydrology of the site, such as depth to orround 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 Konitoring: <br />1. A ground water monitoring program shall be required o;n 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 />a map showing ground water sample points and airy locations <br />proposed as points of compliance; <br />monitoring well completion data; <br />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 />formations, aquifers or strata to be sampled; <br />a identification of potential contamination sources; <br />timetable for implementation of the monitoring program; <br />ambient ground water quality data sufficient to characterize <br />potentially impacted ground water quality. <br />Ground Water Revelations of the Water Quality Control Commi:~sion <br />