Laserfiche WebLink
groundwater moving through the water management system dwarfs the quantity consumed. <br /> When mining and dewatering is soley from the northern portion of the site, concentrations <br /> increase because a majority of the water comes from high concentration areas. However, <br /> there is still enough fresh water and relatively small evapoconcentration effects that water <br /> in the water management pond is below baseline values. Appendix G documents this <br /> calculation. <br /> 4.0 CONCLUSIONS AND RECOMMENDATIONS <br /> This report achieved the overall objectives of this report: <br /> • Sampling of compliance wells and supplementary samples provide a <br /> thorough description of the Site's baseline water quality and the potential <br /> sources that contribute to it <br /> • The evaluations and modeling provide in the report are technically <br /> defensible and show that LRM's proposed activities will not increase COC <br /> concentrations as mining progresses <br /> Literature reviews show that uranium and selenium are typically elevated over Regulation <br /> 41 Standards, and are natural background. Uranium concentrations on the northern part of <br /> the site are elevated prior to any activities by LRM. Through comparative analysis of <br /> whole rock and SPLP data,we have shown that the Pierre Shale is not a source of additional <br /> uranium (or selenium) to the groundwater under oxidizing conditions locally. We have <br /> also shown through comparison of dissolved and total concentration samples soon after <br /> wells were installed that fine sediments in the alluvium are not likely sources of uranium <br /> (or selenium). Geochemical modeling indicates that the oxidation state of groundwater is <br /> such that extreme changes would have to occur to invoke changes in uranium and selenium <br /> concentrations. Mixing modeling shows that LRM will not evapoconcentrate water and <br /> greatly increase the already present groundwater constituents. Thus, the report shows that <br /> LRM's activities do not have a strong potential to influence sources that contribute to <br /> background or baseline groundwater quality. Towards the end of mine life, close <br /> monitoring of water quality in the WMP will be prudent. Mitigation measures should <br /> concentrations start to approach or exceed baseline or standards would be to reduce water <br /> Loveland Ready-Mix Concrete 16 December 2019 <br /> 0 <br /> 2020 407 kn„x,,,_baselin",aterqu I,.. r,d„doer T E L E S T O <br />