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Diamond Pet Food Processors of Ripon California,LLC January 31,2013 <br /> Attachment D Paize 2 of 2 <br /> For the large-sample approximation, I Zs I is compared to a critical value, Z,rit,where Z,,it <br /> is the value of the standard normal distribution for I Zs I with a probability of exceedance <br /> a12. If I Zs I >probability of Zc it, a positive correlation (trend) is indicated. <br /> DISCUSSION <br /> Trend analysis was conducted for the data set from April 2009 to present. <br /> Trends by analytes in all wells show the following characteristics: <br /> o EC concentrations trends are increasing in wells OB-4 and OB-26; stable (no <br /> trend) in wells OB-11, OB-19 and OB-28; decreasing trends are present in wells <br /> OB-2, OB-7, and OB-8. <br /> o TDS concentration trends are increasing in well OB-4; stable(no trend) in wells <br /> OB-11, OB-19, OB-26, and OB-28; and decreasing in wells OB-2, OB-7, and <br /> OB-8. <br /> a Chloride concentration trends are stable(no trend) in wells OB-4, OB-11, OB-26, <br /> and OB-28; decreasing in wells OB-2, OB-7, OB-8, and OB-19. <br /> o Nitrate concentration trends are stable (no trend) in wells OB-2, OB-4, OB-7, OB- <br /> 8, OB-11, OB-19, OB-26, and OB-28. <br /> 10107.03 Lawrence&Associates <br /> W 1CLIENTYDiamond Pet Foods 1010107.01-Groundwater MonitoringlGroundwater MonitoringU012WQ1012 Wfach D Stats.docx <br />