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April 2014 2 10381640A <br />2.0 BACKGROUND INFORMATION <br />2.1 Site History and CKD Placement <br />The Boettcher Limestone Quarry is located in Larimer County near Laporte, Colorado (Figure 1). More <br />specifically, the quarry comprises portions of Township 8 and 9 North, Range 69 West of the 6th Principal <br />Meridian. The original permit for Ideal Basic Industries to operate the Boettcher Quarry (Permit <br />No. M -77 -348) was approved on October 10, 1978 by the Colorado Mined Land Reclamation Board <br />(MLRB), of the Department of Natural Resources. Although the Boettcher Quarry has had several owners <br />during the active lifetime of the quarry, it is currently owned by Holcim (US) Inc., thus Holcim is referred to <br />as the owner /operator in this document. <br />Cement kiln dust (CKD) was generated on Site during operations, which occurred from the early 1900s to <br />2002. Disposal of CKD in mined out portions of the Boettcher Quarry began in 1980. Per the approval of <br />Technical Revision No. 3 (TR -003) to Permit No. M -77 -348 by the Division of Minerals and Geology <br />(DMG) on October 15, 1999 (DMG 1999), CKD disposal would be limited to area A2. CKD disposal in <br />area A2 began in the fall of 1999, and approximately 140,000 cubic yards were placed in the area by <br />August 2002, when the plant closed. Limestone mining operations ceased in August 2002. Reclamation <br />and monitoring activities have been occurring on Site since the plant closure in 2002 (Holnam 2002; <br />Holcim 2004, 2005, 2006, 2007, and 2009). Figure 1 shows the approximate location of CKD disposal <br />area A2 in the A -band mining cut. <br />2.2 CKD Leachate Assessment <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). Secor <br />analyzed the CKD to be disposed in area A2 using the Synthetic Precipitation Leaching Procedure <br />(SPLP; EPA method 1312 [EPA, 2007]). The leachate produced by the SPLP test was used in <br />subsequent batch testing on rock core samples to calculate sorption characteristics of the native rock. <br />Results from the leachate assessment are reported in the Hydrogeologic and Geochemical Assessment <br />of Holnam, Inc.'s Proposed Cement Kiln Dust Disposal Site, Laporte, Colorado (Secor 1998). <br />The CKD materials to be disposed in area A2 were tested for oxides annually from 1990 through 1994, <br />including 1991 when three samples were analyzed. Starting in 1995, quarterly analysis of oxides was <br />performed from the first quarter of 1995 through the first quarter of 2002. The CKD materials were <br />analyzed for the following oxides: aluminum oxide (A1203), calcium oxide (CaO), iron oxide (Fe203), <br />potassium oxide (K20), magnesium oxide (MgO), manganese (III) oxide (Mn203), sodium oxide (Na20), <br />phosphorous trioxide (P203), silicon dioxide (Si02), sulfur trioxide (S03) (total), strontium oxide (SrO), <br />Golder <br />i:NO\81640a\ 0400\ gwchary ellinstallfieldrep _fnl- 30apr14 \10381640a gwcharrpt _holcim- boettcher_!nl- 28apr14 vnth holcim edits.docx <br />Associates <br />