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hydroxides) and carbonates, drops most of the metals from solution. This is <br />analogous to the natural processes which `orm the iron "bogs" in the area. Table 1 1 <br />shows the composition of the modeled discharge water for each of the reference <br />waters and each of the modeled mixes. <br />9.6 ENects of Discharge on Cement Creek <br />The environmental impact of the surface drainage can be assessed in part by <br />comparing the anticipated composition of the discharge to present surface water <br />drainage into which the discharge will eventually flow. In this case, that surface <br />drainage is Cement Creek. That comparison is made between the two modeled mixed <br />waters and Cement Creek at periods of high and low flow in Table 12. Also included <br />in Table 12 are the results of aflow-proportionate mix of the discharge waters with <br />the creek waters at high and tow discharge. There is no discernable impact on <br />Cement Creek water quality that will result from mixing the modeled discharge waters <br />with the surface drainage. The only significant difference between the waters is that <br />the modeled discharge is of higher pH and contains considerably more carbonate <br />buffering than Cement Creek. The result of such mixing could be to increase Cement <br />Creek's buffering capacity and/or decrease the acidity of this stream. <br />Based upon the concentrations of the modeled discharge water and the probable <br />discharge volume, with the conservative assumption of no other losses, such as <br />adsorption of dissolved metals on precipitated oxides, the installation of these <br />.unnylwo~.~rncilY2511A1~r1999.Rp~ 66 <br />II:I SIff1011 HYDRO-SEARCH <br />