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Table 3. Historical Water Quality Data from Cement Plants <br /> Approx. K:Na <br /> Site Location Ratio Data Source <br /> Holcim-Mason City City, IA Seep 1.9 EPA Report to Congress, 1993 <br /> West Quarry 10 <br /> Surrounding GW 6 to 9 <br /> Background GW 0.1 <br /> Lehigh-Mason City, IA Quarry Ponds 2 to 4 EPA Report to Congress, 1993 <br /> Tile Drain from Ponds 2 <br /> Holcim-Dundee, MI Background GW 0.2 to 0.3 Peters,2000 <br /> GW Adjacent to CKD <br /> Waste Area 2 to 6 <br />