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_ SENT BY~ 8- 4-93 :12~42PM ; CANONIE ENGLEWOOD-~ ;# 8/19 <br />` • • <br />3 <br />3.0 IDENTIFY ERRONEOUS DATA POINTS <br />Table 2 identifies data points that may be erroneous. The Identified points were <br />outside the expected ranges determined for each parameter and location, and all <br />points were larger than expected. There was na apparent pattern to the occurrence <br />of these values, which may Indicate analytical errors or actual occurrences. There <br />were two occurrences of larger than expected values for a regulated parameter, as <br />indicated by shading in Table 2. Those occurrences were for iron at HW-4 during the <br />March 1988 and June 1991 sampling events. These two data points were Included <br />in the statistical analysis. <br />Table 3 identifies field pH measurements that may be erroneous and compares them <br />to laboratory pH measurements. Laboratory pH measurements were lower than field <br />measurements for the same samples. The difference in the measurements Indicates <br />that the field measurements were in error, or that the samples changed between the <br />field and laboratory measurements. pH measurements that may be erroneous <br />occurred at outside sampling locations in February, March, November or Derember, <br />Indicating a possible problem with pH meter calibration that is exacerbated 6y cold <br />weather. Two apparently erroneous pH maasuroments from Inside sampling locations <br />also are listed. <br />iwrvnus,nweo..uvr w..,~,..a: <br />