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TEST FOR NORMALITY: <br />NORMAL DISTRIBUTION? <br />I YES <br />TEST FOR OUTLIERS: <br />OUTLIERS PRESENT? <br />NO <br />TRANSFORM DATA <br />DETERMINE PERCENTAGE <br />OF RESULTS (P) ABOVE THE <br />DETECTION LIMIT (DL) AND <br />THE NUMBER OF RESULTS <br />(N) THAT ARE GREATER <br />THAN THE DL. <br />P c85% <br />bjQ <br />N'3 <br />PROCEDURE <br />TEST FOR NORMALITY: <br />NORMAL DISTRIBUTION? <br />50%2 P<85% 10%? P<50% <br />N>g NO N75 i <br />OYES YES <br />REPLACE NON DETECTS WITH I ADJUST THE MEAN AND <br />1/2*DL AND CALCULATE A STANDARD DEVIATION <br />TOLERANCE LIMIT USING COHEN`S METHOD <br />f AND CALCULATE A <br />I TOLERANCE LIMIT <br />DVALUES IN THE <br />DETECTION WELL EXCEED <br />THE TOLERANCE LIMIT? <br />IYES <br />NO <br />NO STATISTICAL EVIDENCE <br />OF CONTAMINATION <br />Pj<10% <br />rca PERFORM A <br />QUALITATIVE <br />INTER -WELL <br />COMPARISON { <br />DATA <br />USE AN INTER -WELL TEST <br />OF PROPORTIONS <br />PROPORTION OF DETECTS <br />IN DETECTION MONITORING <br />WELL EXCEED <br />PROPORTION IN <br />BACKGROUND WELL <br />SIGNIFICANTLY? <br />SIGNIFICANT EVIDENCE OF { <br />CONTAMINATION f <br />FIGURE -1 <br />SCHEMATIC OF STATISTICAL <br />ANALYSIS PROCEDURES <br />CITY OF sTocKTON <br />CH2MHILJL- <br />