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October 2012 <br />1.3 Background Information <br />Attorney Work Product, <br />Confidential and Privileged <br />2 <br />103- 81640A <br />t3.1 Historical Mining and CKD Placement <br />Limestone mining operations ceased in August 2002. Reclamation and monitoring activities have been <br />occurring on Site since the plant closure in 2002 (Holnam 2002; Holcim 2004, 2005, 2006, 2007, and <br />2009). <br />Cement kiln dust (CKD) was generated on Site during the production of cement. Disposal of CKD in <br />mined out portions of the Boettcher Quarry began in 1980. Figure 1 shows the approximate locations of <br />CKD disposal in the A -band (Fort Hayes limestone) mining cut. As per the approval of Technical Revision <br />No. 3 (TR -003) to Permit No. M -77 -348 by the Division of Minerals and Geology (DMG) on October 15, <br />1999 (DMG 1999), future CKD disposal would be limited to the areas A2 and A2 -A. At that time, these <br />areas contained some ponded precipitation runoff. Approximately 140,000 cubic yards (yd were placed <br />in area A2 by August 2002, when the plant closed. <br />Leaching characteristics of CKD to be disposed in area A2 were assessed by Secor International <br />Incorporated (Secor) during a hydrogeologic and geochemical assessment in 1998 (Secor 1998). <br />Secor analyzed the CKD to be disposed in area A2 using the Synthetic Precipitation Leaching Procedure <br />(SPLP). The following metals (dissolved) were detected above the practical quantification limit (PQL) in <br />the first SPLP extraction fluid: arsenic, barium, chromium, lead, selenium, and thallium. These results <br />were presented in an appendix in the 2010 sampling and analysis plan (Golder 2010A). <br />Holcim monitored the CKD to be disposed in area A2 for total metals and oxides. The Toxicity <br />Characteristic Leaching Procedure (TCLP) was used to determine the concentration of leachable metals <br />from the CKD. Analysis for total metals was performed once in 1991 and then quarterly beginning in the <br />first quarter of 1993 through the first quarter of 2002, with the exception of 1994. The TCLP results for <br />the following list of metals were provided in the 2010 sampling and analysis plan (Golder 2010A): <br />antimony, arsenic, barium, beryllium, cadmium, chromium, copper, lead, manganese, mercury, nickel, <br />selenium, silver, titanium, and zinc. <br />CKD was tested for oxides annually from 1990 through 1994, with the exception of 1991 when a total of <br />three samples were analyzed. Starting in 1995, quarterly analysis of oxides was performed from the first <br />quarter of 1995 through the first quarter of 2002. A summary of the oxide results were provided in the <br />2010 sampling and analysis plan (Golder 2010A) for the following oxides: Al CaO, Fe K MgO, <br />Ma Mn P SiO SO (total), SrO, TiO and ZnO. <br />1.3.2 Previous Hydrogeologic Investigation <br />There are four monitoring wells (MW -1, MW -2, MW -3, and MW -4) that have been used to monitor <br />groundwater near CKD disposal area A2 as an additional condition of TR -003. Three of the monitoring <br />1 \10 \81640\ 0400\ characterizationpin_ fnl- 23oct12 \charactenzationpin_fnl- 23oct12 docx <br />Golder <br />Associates <br />