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March 17,2016 Page 6 TABLE 2 MEASURED RCRA METALS CONCENTRATION IN KILN FEED MATERIAL Grab Sample- Grab Sample- Hourly Composite Hourly Composite Jan. 13,2015 AM Jan. 13,2015 PM -June 18,2015 -July 1,2015 Method: Total TCLP Total TCLP Total MEP Total MEP Units: (mg/kg) (mg/L) (mg/kg) (mg/L) (mg/kg (mg/L) (mg/kg) (mg/L) Arsenic 3.17 <0.005 3.20 0.006 3.01 <0.005 3.06 <0.005 Barium 120 0.569 122 0.573 127 0.488 146 0.667 Cadmium 0.395 0.002 0.465 1 0.002 0.414 0.001 0.480 0.001 Chromium 13.9 <0.001 14.0 0.001 15.5 <0.001 15.4 <0.001 Lead 7.81 <0.001 8.53 <0.001 8.80 <0.001 8.98 <0.001 Mercury 6.985 0.0006 23.61 0.0012 24.28 0.0020 51.25 0.0003 Selenium 1.89 0.012 1.62 0.021 1.34 0.016 1.41 0.015 Silver <0.250 <0.001 1 <0.250 <0.001 <0.250 <0.001 1 <0.250 1 <0.001 Paste pH NA NA NA NA 1 11.4 NA 11.3 NA Notes: TCLP=Toxicity Characteristic Leach Procedure,EPA Method 1311 MEP=Multiple Extraction Procedure, EPA Method 1320 Data reported in GCC(2015). Elevated radionuclides including radium-226 and radium-228 have been observed locally in St. Charles River alluvium and in the deeper Dakota Sandstone groundwater. Radium is a decay product of uranium. Sedimentary rocks that are elevated in uranium are most commonly organic-rich rocks like black shales. Rarely, sandstones such as the Dakota host uranium deposits(Kirkhand and Ladwig, 1980). Low-organic limestone and interbedded shale units like the Fort Hayes Limestone in the GCC quarry would be expected to have a low uranium content, for example 0.4 pCi/g(Jones,et al., 1990)or 2 ppm(mg/kg)(Levinson, 1974). Therefore,the GCC quarry would not be expected to be a source of radionuclides that exceed the normal background for the area. Finally,the Fort Hayes Limestone unconfonnably overlies the Carlile Shale Formation. The Blue Hill Shale Member of the Carlile represents a significant aquitard and a likely barrier to downward groundwater flow. In the quarry area two thin(<30 feet thick)Carlile Member units lie between the Fort Hays Limestone and Blue Hill Shale. These are the Juana Lopez(may be absent)and Codell Sandstone Members. The geochemistry of these unit has not been characterized in the quarry area. However,nothing in their description would suggest that they are capable of transmitting significant groundwater away from the quarry nor that they would they contribute deleterious chemical concentrations to the groundwater system. In summary, if groundwater were to be found in wells downgradient from the quarry,the water should initially be characterized by analyzing for a broad suite to confirm the analyte list,but absent any petroleum or chemical spills,constituents of any real concern are rather limited. Close Consulting Group LLC