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Upgradient and Cross-gradient Wells to the West and North <br /> • West-A total of approximately twenty-one (21)wells are permitted upgradient of <br /> the site to the west. Eighteen (18)of these wells are domestic wells, two (2)of <br /> these wells are irrigation wells, and one (1) is a monitoring well. <br /> • North-A total of approximately twenty-five (25)wells are permitted upgradient <br /> and cross-gradient of the site to the north. Fifteen (15)of these wells are <br /> domestic, nine (9)are monitoring, and one (1) is an irrigation well. <br /> Downgradient Wells to the East and South <br /> • East—A total of four(4)wells are permitted downgradient of the site to the east. <br /> Three (3)of these wells are domestic and one (1) is an irrigation well. <br /> • South—A total of thirty (30)wells are located on the south side of the Arkansas <br /> River, beyond the hydraulic barrier the river forms. Twenty-six(26)of these <br /> wells are domestic, two (2) are irrigation, and two (2) are abandoned. <br /> Mitigation Plan <br /> The site mining and reclamation activities are unlikely to adversely affect area wells because dewatering at <br /> the freshwater and siltation pond is anticipated to be minimal and limited amounts of dewatering will occur at <br /> the south side of the lined cells before these cells are lined. All dewatering will be under an approved <br /> SWSP. Upgradient and cross-gradient wells are far from the mine and downgradient wells are far from the <br /> mine or on the opposite side of the river. However, if the miner receives a complaint, the following <br /> mitigation plan will be implemented. <br /> Martin Marietta intends to install monitoring wells at the mine prior to exposing groundwater. The water <br /> levels in these monitoring wells will be measured monthly to identify potential changes in alluvial <br /> groundwater flow or elevation associated with mining and reclamation activities. Baseline data will be <br /> collected a minimum of five quarters prior to exposing groundwater to provide a range of relative water <br /> levels associated with premining groundwater conditions. It is anticipated that groundwater levels will tend <br /> to fluctuate being highest in the summer irrigation season and lowest in the winter and early spring. <br /> If, during mining or reclamation, the miner receives a complaint from any well owner within 600 feet of the <br /> permit boundary, then the miner will immediately notify the DRMS. <br /> After the DRMS has been notified, the miner will review any data and available information as well as submit <br /> a report to the DRMS within 30 days of notification. The evaluation will include a review of available <br /> baseline data and evaluate whether changes may be due to seasonal variations, climate, mining, mine cell <br /> lining or other factors. The report will identify the extent of potential impacts associated with any evaluation <br /> findings. If the extent of groundwater changes due to mining or reclamation activities is determined to be a <br /> significant contributing factor that has or may create adverse impacts, the mining associated impacts will be <br /> addressed. <br /> The miner will begin implementing one or more mitigation measures if mining and reclamation activity is <br /> determined to be a significant factor of groundwater changes. <br /> Mitigation measures may include, but are not limited to: <br /> Martin Marietta Materials—Thunderbird Sand and Gravel—MLRB 112 Permit Application <br /> Exhibit G-6 <br />