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o <br /> <br />Page Q-175 contains a statement that 93% of the identified wells are protected "to <br />some degree" by an overlying aquitard. The aquitard is not continuous across the <br />site as the till layer was absent at boring B-112 and B-129 thus allowing a direct <br />hydraulic connection between the upper and lower sand units and potentially to the <br />underlying bedrock aquifer(s) as well due to a poss~le bedrock contact at B-129. <br /> <br />E. Site Geology . . <br /> <br />No comments. <br /> <br />F. Site Hydrogeology <br /> <br />The lower outwash sand aquifer has been defined as sand below till. If the till <br />thickness is small and discontinuous this may include wells that should actually be <br />grouped in the water table aquifer. <br /> <br />J <br /> <br />Borings should extend at least two sample intervals into till to confirm continuity <br />and character. This will prevent describing discontinuous till lenses as part of the <br />main unit. (Such lenses are probably not till but localized fine grained channel <br />deposits in the outwash. <br /> <br />G. Summary <br /> <br />The report, while mentioning the direct hydraulic connection of the upper and <br />lower sand units, does not give much more attention to this condition. A further <br />interconnection between the lower sand-buried outwash aquifer and the bedrock <br />aquifer would seemingly reinforce the need to further delineate and address such <br />connections. <br /> <br />13 <br /> <br /> <br />