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March 17, 2016 Page 4 TABLE 1 MEASURED RCRA METALS CONCENTRATION IN QUARRY FORT HAYES LIMESTONE Crusher Rejects— Crusher Rejects— Quarry Floor— Average Concentrations June 11-13,2015 June 14-17,2015 June 17,2015 for Limestones Method: Total MEP Total MEP Total MEP Total Units: (mg/kg) m m m L m m ) m ) Arsenic 6.20 <0.005 5.54 <0.005 5.56 <0.005 <1 —20(a),2.5*(b) Barium 164 0.218 150 0.288 257 0.118 100*(b) Cadmium 0.443 0.003 0.462 0.002 <0.250 0.002 0.007— 12(a),0.1*(b) Chromium 11.3 <0.001 8.92 <0.001 11.9 0.003 10*(a&b) Lead 11.1 1 0.002 8.91 0.002 7.99 <0.001 90),8*(b) Mercury 0.0437 <0.0002 0.0321 <0.0002 0.0145 <0.0002 <0.010—0.290(a),0.05*(b) Selenium <1.25 0.011 . 1.82 0.011 <1.25 <0.005 0.03*(a),0.08*(b) Silver <0.250 <0.001 <0.250 <0.001 <0.250 <0.001 0.12*(a), 1*(b) Notes: MEP=Multiple Extraction Procedure,EPA Method 1320 *=Mean (a)=Papers in Alloway(1990) (b)=Levinson(1974) Data reported in GCC(2015). The barium present likely is derived from barium carbonate(e.g.,witherite),which has the same approximate solubility as calcite. The solubility of barium is also strongly influenced by sulfate(Hem, 1985). The slightly elevated aqueous barium concentrations may attest to the relatively low sulfur concentration in the Fort Hayes Limestone. Any mixing with water containing a higher sulfate concentration would likely reduce the soluble barium concentration. POTENTIAL MONITORING PARAMETERS If groundwater were to occur downgradient from the quarry and plant site,this section addresses what is known about the potential character of that water and constituents that may be of interest for monitoring. Under the existing groundwater monitoring plan,if water were to occur in the only site monitoring well, MW-005, it would be analyzed for field pH,conductivity and temperature,and in the lab for sulfate,TDS, radium-226 and radium-228. This parameter list was developed based on results from the St.Charles River monitoring wells,which have since been proven to not be applicable for GCC monitoring and accordingly plugged and abandoned. To date,no groundwater has been observed in strata related to GCC operations of quarrying Fort Hayes Limestone. Given the overall typical limestone character of the Fort Hayes at the GCC quarry,the general water quality associated with any precipitation contacting and subsequently infiltrating to groundwater is expected to be similar to the water quality of a typical carbonate aquifer dominated by concentrations of calcium and bicarbonate. If groundwater associated with the Fort Hayes Limestone were to be observed,the water quality would be dependent on the location of infiltration to the unit. Older water that has resided a long time or traveled a long distance in the limestone would more likely be in equilibrium with calcium carbonate Close Consulting Group LLC