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ARCADIS <br />fluoride, chloride, nitrogen (ammonia), nitrate-nitrite, hardness (as calcium carbonate <br />[CaCO31) and sulfate. <br /> <br />i <br />The groundwater level measurements collected on April 21, 2009 are similar to <br />historical groundwater level measurements from these wells. Groundwater elevation <br />contours developed using the groundwater level measurements show that <br />groundwater generally flows to the south toward the Arkansas River. In addition, the <br />water level in well MW-13 appears to conform to the general groundwater direction. <br />No evaluation of the groundwater at monitoring well MW-13 is possible at this time. <br />Data evaluation will be performed following five consecutive quarterly monitoring <br />events at this well (ending in early 2010). Concentrations of four parameters from the <br />monitoring well MW-12 sample exceeded their respective compliance criteria. <br />However, this well is located upgradient of the CKD landfill and is thus groundwater <br />quality there is not impacted by the landfill. <br />Results of the groundwater sampling show that concentrations of three analytical <br />parameters (sodium, aluminum, and pH) at downgradient well MW-7 exceeded their <br />respective compliance criteria. However, time series graphs of indicator parameters for <br />CKD show a downward concentration trend. <br />Based on the information presented in this report, groundwater quality has not been <br />affected by the disposal of CKD, as well as, no significant changes have occurred to <br />groundwater quality at the CKD landfill since 1998. Although the sodium concentration <br />in MW-7 exceeded the DRMS-approved compliance standards, this concentration was <br />less than 10 percent above the compliance standard; therefore, the frequency of <br />monitoring will remain annual. Well MW-13 will continue to be sampled quarterly for the <br />first year, but we recommend MW-13 be sampled annually thereafter. <br />c:Wocuments and settings\.stobgy\my documents\holcim\025911978_holcimreg version final.docx <br />Final April 2009 <br />Groundwater <br />Monitoring Report <br />Florence, California <br />iv