Laserfiche WebLink
in MW-06 and MW-10 is elevated above other locations reported in Tables 2 and 3. The <br /> relative influence of nitrate on constituents whose concentrations are driven by oxidation <br /> state is discussed further in Section 3.2. <br /> 2.2.2 Solids Samples <br /> Table 4 presents the results from whole rock analysis of select samples taken from the <br /> bottom of boreholes in the top of the Pierre Shale. Whole rock analysis is performed by <br /> digesting the solids in a strong acid (i.e., completely dissolving the solids), and analyzing <br /> the resulting solution. Whole rock analysis is useful in determining if a rock or soil matrix <br /> contains constituents of interest, and if the rock has the potential to be a source. It only <br /> indicates if the constituents are present, and does not indicate if the constituents will be <br /> mobilized when in contact with water or air. In terms of the parameters exceeded in the <br /> compliance wells, MW-06 and MW-10, the Pierre Shale at MW-06 contained the highest <br /> quantity of uranium while the quantity at MW-10 was near the arithmetic average. Both <br /> MW-06 and MW-10 showed non-detect for selenium. <br /> 2.2.3 Leachate Samples <br /> A helpful method of determining if a rock can release constituents when contacted by water <br /> is a leaching test. The SPLP is considered an aggressive extraction leaching procedure. <br /> The SPLP was developed by the EPA and designed to determine the mobility of organic <br /> and inorganic analytes in soils and evaluate the potential impact of contaminants on ground <br /> water. Table 5 presents the analytical results from the Pierre Shale samples collected from <br /> the bottom of boreholes during monitoring well construction. ALS analyzed samples B- <br /> 20 through B-24 within a week after the samples were collected. ALS analyzed the MW- <br /> 01 through MW-13 samples in March 2018, approximately 11 months following sample <br /> collection, which allowed samples to oxidize. Both MW-06 and MW-10 showed non- <br /> detect for selenium and only MW-06 showed a presence of uranium in the leachate. <br /> Leachate results are typically considered maximum values that a source can produce. MW- <br /> 06 leachate uranium values were approximately 10-fold lower than groundwater samples <br /> from the same location. <br /> Loveland Ready-Mix Concrete 7 December 2019 <br /> 2020„_kn,,.p,t_baselmmaterquallt,y n do, T E L E S T O <br />