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kn K L E I N F E L D E R <br /> 6. PROPOSED CONCENTRATION LIMITS AND EXCEEDANCE PROTOCOL <br /> 6.1 CONCENTRATION LIMITS <br /> In setting concentration limits, different approaches can be used such as setting the concentraton <br /> limit equal to a regulatory standard such as the Agricultural Water Quality Goal of the primary <br /> maximum contaminant level. We have elected to use what we believe to be the preferable and <br /> conservative approach, using background data to set the concentration limit. Data from MW-5, <br /> the primary background well for the facility, was used to calculate the Concentration Limit. <br /> Concentration Limits were set equal to the upper tolerance limit calculated for each constituent <br /> of concern. The statistical methodology we followed is in the US EPA document "Statistical <br /> Analysis of Groundwater Monitoring Data at RCRA Facilities Interim Final Guidance", dated <br /> April 1989. We first checked the data for mormality using the Coefficient of Variation (COV) <br /> test. If the COV is less than 1.5, then the data approximate a normal distribution. After <br /> establishing that the data were normally distributed,the upper tolerance limit was calculated. <br /> Coefficient of Variation: <br /> CV=(Standard Deviation of the Data Set)/(Mean of the Data Set) <br /> Using this equation, the Coefficients of Variation (CV) was calculated for the <br /> Constituents of Concern in the background monitoring well MW-5). <br /> Constituent of Concern Coefficient of Variation C <br /> Total Dissolved Solids 0.528 <br /> Bicarbonate 0.621 <br /> Chloride 0.737 <br /> Nitrate as N 2.10 <br /> Sulfate 1.429 <br /> Specific Conductance 0.534 <br /> Calcium 0.844 <br /> Sodium 0.419 <br /> 20-3978-03.MTG/2002R046r/2002LA82 Page 9 of 1 I <br /> Copyright 2002,Kleinfelder.Inc. March 11,2002 <br />