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To: Jared Ebert <br /> Date: December 29, 2017 <br /> Page 22 <br /> Comment 44 <br /> The Division received an objection from the No Laporte Gravel Corp. One of the issues <br /> raised in the objection was a concern vegetation grown in the bottom of the pit <br /> excavation would have greater exposure to possible toxin such as Selenium (Se)from the <br /> Pierre Shale pit bottoms which could provide a risk to both wild and domestic animals. <br /> Please provide a response to this concern. <br /> Response 44 <br /> The pit bottoms will be covered with over three feet of cover material at closure. <br /> Because the Pierre Shale has a low hydraulic conductivity and is relatively dry, the only <br /> mechanism for moving constituents upward into the cover material will be by molecular <br /> diffusion, which is a slow process in and of itself. When occurring in relatively dry <br /> materials, molecular diffusion is even slower. Regardless, LRM commits to sampling <br /> vegetation after closure to evaluate if plant uptake is an issue. <br /> RULE 6.4.9 EXHIBIT I - SOILS INFORMATION <br /> Comment 45 <br /> Please provide the thickness of the soil for each unit shown on Table 4. <br /> Response 45 <br /> The representative profile thickness for Soil Series is listed below: <br /> Soil Map Unit 22 (Caruso Series) <br /> Al - 0 to 11 inches <br /> C 1 - 11 to 17 inches <br /> C2 - 17 to 25 inches <br /> C3 - 25 to 35 inches <br /> C4 - 35 to 44 inches <br /> II C5 - 44 to 60 inches <br /> Soil Map Unit 64 (Loveland Series) <br /> Al —0 to 8 inches <br /> Al2g— 8 to 15 inches <br /> C 1 g— 15 to 32 inches <br /> 1IC2g—32 to 60 inches <br /> Soil Map Unit 76 (Nunn Series) <br /> A 1 —0 to 6 inches <br /> Response to DBMS comments T E L E S T O <br />