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Morrison Quarry October 22, 2018 <br /> Permit No. M-1973-021 (AM06) Page 2 of 2 <br /> Since the proposed mining depth of 6,195 feet in the South Quarry is considerably lower than the above <br /> referenced groundwater surface elevations, it seems likely that this mining operation would result in the <br /> exposure of groundwater. Because it can be difficult to tell the source of water in an excavation, this office <br /> requests that the applicant be required to install piezometers around the South Quarry to measure the <br /> groundwater level and demonstrate that the excavation is not exposing groundwater. If mining at the site <br /> exposes groundwater, the excavation is considered a well and will require an approved substitute water supply <br /> plan or decreed plan for augmentation to replace the evaporative losses to the stream system. All mining at <br /> the site must cease and all exposed groundwater must be backfilled until such time as the applicant has <br /> obtained such approvals. <br /> If stormwater runoff is intercepted by this operation and is not diverted or captured in priority, it must be <br /> released to the stream system or infiltrate into the ground within 72 hours; otherwise the operator will need to <br /> make replacements for evaporation. <br /> The applicant may contact the State Engineer's Office with any questions. <br />