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Bu[IdoR Mine Tailings Ponds Evaluation <br />6.4 Attenuation of Seepage <br />. Attenuation test results show that the Creede Formation sediments have a high retardation <br />capacity and that manganese, lead, and antimony would be significantly immobilized by <br />formation sorption if seepage from the tailings were to occur. <br />6.5 Dilution of Seepage <br />The contributing watershed azeas (or footprint) beneath the Upper and Lower Tailings Ponds <br />(delineated on Figure 2.1) comprise roughly 10 percent of the watershed area in each case. These <br />surface areas were combined with an infiltration value of 10 percent of total precipitation on <br />vegetated, natural azeas and an infiltration value of 40 percent of total precipitation on the <br />tailings ponds (as discussed in Section 4.6). For this conservative infiltration scenario and <br />tailings seepage miring with ground water beneath each tailings impoundment, the dilution of <br />tailings seepage immediately downgradient from each impoundment would be at least 3:1. [f <br />points farther downstream are considered, the ground water flow and resulting dilution effects <br />would even further reduce the potential for impacts to ground water quality. <br />C~ <br />• <br />HomesmAe Alining Compon}~ Shepherd .L/i/ler. lnc. <br />p~u-dl nn~dly.A.ryr SO dprd lf, !99% <br />