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Jerry Schnabel, Bob Stabo <br /> July 11, 2016 <br /> Page 5 <br /> 3. Contamination of nearby surface water - If a surface water system in connection with an <br /> aquifer is contaminated by an unnatural source,then the aquifer may be contaminated as a <br /> result of contaminated water infiltrating from the surface water source into the aquifer. <br /> 4. Surface contamination - If contaminants are present on the ground surface outside of a <br /> drainage,then the contaminants may infiltrate to the aquifer and contaminate an aquifer or <br /> wells. <br /> As indicated in the public notice comments, the local aquifers are subject to unfavorable water <br /> quality. The comments indicate that local wells may produce water that is high in lead, total <br /> dissolved solids, calcium carbonate, uranium, "other heavy metals" and "radiological" <br /> contaminants. No water quality testing was performed as part of this effort, but based on the <br /> provided comments, concerns exist about the existing water quality of the local aquifer systems. <br /> This unfavorable water quality is naturally occurring. These comments indicate that Scenario No. <br /> 1 described above, natural minerals in ground water, already occurs in local ground water supply <br /> wells. <br /> The comments also indicate that discolored water is sometimes produced from local wells after <br /> precipitation events. This indicates that Scenario No.2 described above,suspended solids pumped <br /> from wells after precipitation events, already exists in nearby wells, as a result of natural fractures <br /> in the aquifer or as a result of poor grout seals in wells. Again, these conditions already occur in <br /> a pre-mining condition. <br /> Future contamination of the aquifer or wells resulting from mining,if it were to occur,would occur <br /> in Scenario Nos. 3 and 4 described above, if contamination occurred to either a surface stream or <br /> if contaminants were introduced on the ground surface outside of a drainage. We believe that <br /> Scenario No.3,contaminants delivered to stream systems,is very unlikely to occur because Transit <br /> Mix will employ best management practices to protect surface water sources. Based on <br /> conversations with Transit Mix, a National Pollutant Discharge Elimination System (NPDES) <br /> permit will be pursued for the proposed quarry. This permit has not been acquired at the time of <br /> this summary memorandum,but will be a requirement for mining. The NPDES permit is designed <br /> to address water pollution from point sources that may discharge pollutants to waters of the United <br /> States. The NPDES permit will present pollutant limits based on the technology available to <br /> control the pollutants and that are protective of the water quality standards of the receiving water. <br /> Transit Mix will be required to meet these limits to be in accordance with the permitting. At a <br /> minimum, runoff through the site will be controlled with detention basins which will prevent fine <br /> sediment and other material from entering the surface water systems at the site. <br /> Scenario 4, surface contamination is very unlikely to occur because the mine plan includes a spill <br /> prevention and hazardous materials management plan. The purpose of this plan is to minimize <br /> any potential by utilizing best management practices and technology to avoid and mitigate any <br /> spills at the site. <br /> As indicated above,the fracturing of rock material associated with blasting will be localized to the <br /> mine excavation materials. New fractures or conduits that extend through the granitic material <br /> and into local aquifer systems will not be created. The areas in which the mining will occur are <br /> WO <br /> ... Associates, <br />