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3.0 EVALUATION AND DISCUSSION <br /> 3.1 Water Quality Results <br /> Groundwater chemistry of samples collected from monitoring wells did not vary <br /> considerably over the eight quarters of sampling. Initial dissolved iron concentrations were <br /> elevated in multiple wells/piezometers during the second quarter of sampling, which we <br /> attribute to pyrite oxidation in captured sediments and the immediate vicinity of the newly <br /> installed monitoring wells. These concentrations are currently below the CDPHE standard <br /> and are not anticipated to increase as exhibited by the subsequent sampling events. <br /> Uranium concentrations were consistently elevated in two monitoring wells (MW-06 and <br /> MW-10),exceeding the CDPHE standard of 0.03 mg/L over the eight quarters of sampling. <br /> Other monitoring wells had elevated uranium (MW-08, P-1, and P-4)with concentrations <br /> that exceeded CDPHE standard for one quarter(MW-08 and P-4)or were near the standard <br /> (P-1). <br /> Nitrate and selenium concentrations in MW-06 and MW-10 were higher than other <br /> monitoring wells at the Site but did not exceed the CDPHE standard during the period of <br /> sampling. These monitoring wells also had elevated sulfate and total dissolved solids <br /> (TDS), exceeding the Regulation 41 Tables 2 and 4 Standards of 250 and 400 mg/L, <br /> respectively. They were also higher than other compliance wells. Manganese <br /> concentration was also found to be higher than CDPHE standard in P-4 during the second <br /> quarterly sampling. These monitoring points are near MW-06 and MW-10(Figure 3). <br /> Based on these results, the primary COC is uranium. Sulfate and TDS are also worthy of <br /> note as they are above Regulation 41 Tables 2 and 4 standards. Other constituents, <br /> including selenium, iron, nitrate, and manganese, were elevated, but did not consistently <br /> exceed Regulation 41 Standards over the eight quarters of sampling. <br /> Water quality results were reported as both dissolved(Table 2)and total(Table 3)fractions. <br /> Total concentrations include chemical analysis without prior filtering or treatment, and <br /> include suspended colloids and aggregates present in the water in the analytical results. <br /> Loveland Ready-Mix Concrete 9 December 2019 <br /> 20200107_knozp0_haulm.mcrquahhcswnman.does T E L E S T O <br />