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4 <br /> 15 June 2009 <br /> \.Be AGE-NC Project No.05-1306 <br /> Page 17 of 33 <br /> trend.However,it is necessary to compute the probability associated with S and the sample size,n, <br /> `" to statistically quantify the significance of the trend. Therefore the test results include assessment <br /> at the 80 percent and 90 percent confidence levels. Also included on the spreadsheet of results are <br /> L. the average, standard deviation (6), and coefficient of variation (CV) of the contaminant levels <br /> If the test results indicate "no trend" at the 80 percent confidence level, a plume stability test result <br /> is also considered using the coefficient of variation(CV)such that if the CV is<or=to 1,the plume <br /> is considered "stable" if the CV is> 1, the plume is considered "unstable". <br /> 1` Additional information regarding the Mann-Kendall Test assumptions and procedures is included <br /> in Appendix J.In order to utilize a program that was designed to analyze data sets from LUST sites <br /> that has formulas locked and not open to manipulation, the Mann-Kendall Statistical Test Form <br /> �- 4400-215 (212001) from the Wisconsin Department of Natural Resources Remediation and <br /> Redevelopment Program was utilized. <br /> w.. <br /> 6.1.1. Mann-Kendall Test Data and Assumptions <br /> Data were assembled to include one or more monitoring wells near the down-gradient plume margin, <br /> monitoring wells near the source zone,and monitoring wells along the flow line between the source <br /> and the down gradient plume margin well(s). Data were analyzed in groups of ten rounds per data <br /> set. Therefore,wells with greater than ten consecutive rounds were broken down into groupings of <br /> ten consecutive data sets with the focus being on the most recent set of ten rounds being tested. <br /> Wells with appropriate historical data where this test was performed include: <br /> • MW-3 (thirty six rounds of data total from 14 August 1998 to 05 March 2009 with a range <br /> of thirty four TPH-d detections from <50 µg11 to 30,000 µg/l and a range of five TPH-g <br /> detections from 120 µg11 to 1,400 µg11); <br /> • MW-4 (thirty rounds of data total from 07 June 2000 to 05 March 2009 with a range of <br /> twenty eight TPH-d detections from 78 µg11 to 23,000 gg/l and a range of six TPH-g <br /> detections from 110 µg11 to 940 µg/1); <br /> • MW-5 (twenty seven rounds from 07 June 2000 to 05 March 2009 with a range of fourteen <br /> TPH-d detections from 55 gg/l to 170 µg11 with no test for TPH-g since all results indicated <br /> non-detect); <br /> MW-6(twenty six rounds from 13 July 2000 to 05 March 2009 with a range of three TPH-d <br /> detections from 60 µg/1 to 170 µg/1 with no test for TPH-g since all results indicated <br /> non-detect); and <br /> t_ <br /> Advanced CeoEnvironmental,Inc. <br /> V <br />