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quality above Regulation 41 Standards for uranium (Table 2). Thus, to better delineate <br /> groundwater chemistry spatial variability and reduce uncertainty, Telesto conducted <br /> additional groundwater sampling on monitoring wells MW-05, MW-07, MW-08, and <br /> MW-09 for two quarters. We also installed and sampled four temporary (push type) <br /> piezometers (P-1 through P-4) were installed and sampled (Figure 3) as part of the <br /> groundwater quality assessment. Analytical Laboratory Services—Fort Collins, Colorado <br /> (ALS), conducted all laboratory analysis for all the groundwater samples collected by <br /> Telesto. <br /> When installing site monitoring wells, Telesto drilled into and collected geotechnical <br /> samples from the underlying bedrock. We sent a random selection of these geotechnical <br /> samples to ALS for the Environmental Protection Agency's Synthetic Precipitation <br /> Leaching Procedure(SPLP)and whole-rock chemical analysis. <br /> 1.4.2 Identification of Site COCs <br /> Telesto summarized the analytical results of over a year's worth of quarterly groundwater <br /> quality samples, and one-time leachate and whole-rock samples collected from the <br /> weathered bedrock at the base of the alluvial fill. We looked for constituents that were <br /> near the WQCC's primary drinking water standard in these baseline water quality samples, <br /> and those detected that might have the potential to increase above the standard due to <br /> oxidation processes and evapoconcentration. <br /> 1.4.3 Quantitative Assessment <br /> Telesto utilized straightforward,first principals geochemical,geophysical and hydrological <br /> analyses to evaluate the collected data and deterime the disposition of COCs at the Site. <br /> We utilized PHREEQC and other geochemical modeling tools to enhance and validate the <br /> first-principal approach. <br /> Loveland Ready-Mix Concrete 5 December 019 <br /> 202 ,_kn,,w, beschM„o,e,yual, summon,k TELESTO <br />