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i <br /> 1 <br /> ARCADIS Mr.Timothy A. Cazier <br /> August 4,2014 <br /> Table 3 provides examples of sites in the United States that have exhibited <br /> groundwater and surface water impacts from leaching of CKD. Note that in all cases <br /> 1 the impacted location exhibited elevated K:Na (ranging from 1.9 to 10),whereas the <br /> background locations exhibited K:Na from 0A to 0.3, Based on our experience at <br /> CKD impacted sites, a K:Na of greater than 0.5 to 1 is a good indicator of impact <br /> from CKD. <br /> Summary <br /> tThe information provided herein indicates that sodium is not a good indicator of <br /> impacts from CKD. Accordingly, we propose to remove sodium as an indicator <br /> parameter from the groundwater monitoring plan for DRMS Permit No. M-1977-344 <br /> (Holcim— Portland, Colorado quarry) that was last updated by DRMS on November <br /> 27, 2012. We propose to amend the plan by replacing sodium with the K:Na, and <br /> would propose a NPL of 0.5. Potassium should remain on the plan as an indicator <br /> parameter. <br /> References <br /> ' Peters, C.S., 2000. Attenuation of Cement Kiln Dust Leachate by Clay Soils. Air and <br /> Waste Management Association—Publications—VIP, 31-44. 14 pages. <br /> Resource Geosciences, Inc. 1999. Hydrogeologic Assessment, HOLNAM, Inc., <br /> Portland , Colorado. RGI Project Number 04548198,January 27, 1999, <br /> USEPA,1993. Report to Congress on Cement Kiln Dust. United States <br /> Environmental Protection Agency—Office of Solid Waste and Emergency Response. <br /> EPA-530—R-97-001. December 1993. <br /> We look forward to your response. Please contact me at 517.324 5052 (office) or <br /> 517.927.3611 (cell)if you have any questions. <br /> Sincerely, <br /> ARCADIS <br /> Christopher S, Peters,CPG <br /> Vice President <br /> Attachments: <br /> Page: <br /> CUIa:y,awmowm.oualam401!AW.7 FWwV201408w PXP-WtDRe ­Re8nn Ground:aw I fononm•FINAL don 3/4 <br />