5.1 PCSR 08-23-1994 - Laserfiche WebLink

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indicated on the attached figure. • Each of the monitoring wells should be installed on the innermost fringe of the buffer zone nearest to the Shiely well as possible, and be constructed by a licensed well contractor per Minnesota Department of Health (MDH) regulations. In addition each well should be surveyed for the top of casing elevation so that all water levels can be converted to elevation. WATER LEVEL MONITORING RECOMMENDATIONS Water level data, along with accurate pumping rate data, should be collected for documenting the effect of pumping on groundwater levels, and as an aid in identifying the need for, or effectiveness of mitigative measures. Pumping rate information should be collected from the Shiely well. At a minimum water level data should be collected from the Shiely well, the monitoring wells and any other available observation points according to the following schedule: - immediately prior to initiation of seasonal pumping; - at the pumping well 24 hours after pump start-up; - at all wells 1 week after initiation of pumping; - monthly at all wells throughout the duration of the pumping season; - immediately prior to seasonal shut - down; • - at the pumping well 24 hours after shut - down; - at all wells 1 week after shut down, and - at all wells 1 month after shut down. WATER QUALITY MONITORING RECOMMENDATIONS Section 3.3 of the EIS indicates that potential groundwater quality impacts attributable to the mining operations are primarily associated with use of above-ground fuel storage tanks. Implementation of the required spill prevention plans and secondary containment minimizes the potential for groundwater impacts. Should any groundwater impacts from the mining operations, or other unrelated occurrence, occur in the vicinity of the well, it is likely that the impacts would be drawn toward the pumping well. Operation of the Shiely well would, therefore, reduce the potential that impacts would occur in residential wells. Therefore, an extensive water quality monitoring program does not appear warranted. A limited monitoring program, as recommended below, will provide background water quality. Background Monitoring: Sample and analyze the monitoring wells and one or two residential wells each along the western and southern boundaries. The recommended monitoring parameters include MDH volatile organic compounds (VOCs), and diesel range organics (DRO). The monitoring wells should also be tested for general background chemistry parameters including nitrate + nitrite, alkalinity, chloride, sulfate, sodium, potassium and dissolved metals. •