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<br /> <br />F. Neither supporting studies nor cited scientifrc data show that toxic, acid forming, or <br />tonic-producing materials are absent from t{te site. No substantive basis for pln~ts to <br />prevent t:egative impacts on ground and surface water. <br />RESPONSE. The gravel is composed dominantly of andesite and latite, which <br />are neither acid producing nor contain elevated metal concentrations. A study is <br />not necessary. Experience at numerous other sites provides ample anecdotal <br />evidence in this regard. <br />G. No testing of grozndwater prior to mining. No baseline data gathering reguirentents. <br />RESPONSE. While it would be advisable to collect groundwater quality <br />information prior to mining at this deposit and to monitor for key constituents to <br />insure that operations proceed as planned, background water quality data are not <br />characteristically required for gravel operations. <br />H. Effects of mining on water quality and temperature of Dolores River. <br />RESPONSE. Temperature would be regulated through the CDPS discharge <br />permit. <br />I. No specific safeguards to ensure containtnent of toxins iron: river. Daring high flow, <br />polluted water will coagulate and sat:trate fire grotuzd of adjacent properties then <br />stagnate. <br />RESPONSE. It is not anticipated that pollutants will be generated in quantities <br />sufficient to warrant safeguards. <br />J. Mining will raise radioactive radon which will precipitate itz high concentration on <br />dust. The radioactive d:ts[ will settle into the soil and adversely affect t{te ecosystem. <br />RESPONSE. There appears to be no reason to anticipate that dust will <br />preferentially concentrate radon, and no reason to indicate that the radon flux from <br />the sediments will increase measureably as a result of mining. <br />K Radioactive dust in the air will adversely affect nzigratorv birds, tourists and residents <br />traversing the valley. <br />RESPONSE. This comment is without substance. <br />L. Elevated Hg levels in McPhee Reservoir fish tna}> resztlt from gravel ttzining. <br />12 <br />