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• Placing water in a recharge pond to raise groundwater levels around the well. <br /> • Cleaning the well to improve efficiency. <br /> • Providing an alternative source of water to support historic well use in terms of water <br /> quantity and quality. <br /> • Modifying a well to operate under lower groundwater conditions. This could include <br /> deepening the well or lowering pumps. All work would be done at the miner's expense <br /> with the exception of replacing equipment that was non-functional prior to mining. <br /> • Providing a well with a sump. The sump would allow for sufficient storage of water to <br /> allow historic well capacities to be met. <br /> • If existing wells cannot be retrofitted or repaired, replacing the impacted well. <br /> Groundwater Quality Monitoring Plan <br /> We do not anticipate that onsite operations will have a negative effect on groundwater quality. Operations <br /> at the site will take place inside of lined cells, except for establishing the Freshwater Pond and Siltation <br /> Pond and the initial mining of phases 2 and 3. To evaluate pre-mining groundwater quality at the site, the <br /> permittee will sample a designated compliance well on the downgradient side of the site five quarters prior <br /> to exposing groundwater. The sample will be analyzed for the suite of analytes described in the following <br /> paragraphs. Some naturally occurring analytes may be detected in the analyses. The five quarterly <br /> samples will serve as the baseline to which all compliance samples will be compared. <br /> To establish that mining has not had a negative effect on water quality in the area, the Miner will sample the <br /> designated compliance well annually once the groundwater is exposed until mining is completed. Martin <br /> Marietta will notify DRMS within 30 days of receiving the full, finalized report that indicates any of the results <br /> for any of the parameters listed in Table G-1 exceed the baseline results. Water quality lab results will be <br /> included in the DRMS annual report for the site. <br /> Annual groundwater quality testing will be conducted for the life of the mine unless the requirement has <br /> been reduced or eliminated through the Technical Revision process with the DRMS. <br /> If sufficient data is collected during the life of the mining operation, and a demonstration can be made that <br /> project impacts to the groundwater system have been minimized, Martin Marietta may request approval of a <br /> Technical Revision to revise the water level monitoring frequency or water quality sample collection <br /> frequency at a later date. <br /> The DRMS recommends a set of groundwater quality parameters for analysis for aggregate mine permitting. <br /> These include a list of dissolved metals, radiological parameters, and miscellaneous parameters which <br /> include pH and Total Dissolved Solids (TDS). The nature of activities associated with sand and gravel <br /> mining involves the excavation of large volumes of aggregate materials using industrial machinery. These <br /> activities inherently do not result in the generation or release of coliform, bacteria, asbestos, chlorophenol, <br /> foaming agents, odor, or phenol compounds. They also do not result in a change in corrosivity of water or <br /> color change. As a result, these parameters which are otherwise a part of the DRMS requirements for water <br /> quality analyses are excluded from the list of water quality parameters. Likewise, sand and gravel mining <br /> does not lead to the generation or release of gross alpha or beta and photon emitters as part of the <br /> operation. The complete list of water quality parameters proposed for analysis is presented on Table G-1. <br /> Martin Marietta Materials—Thunderbird Sand and Gravel—MLRB 112 Permit Application <br /> Exhibit G-7 <br />