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Box Plot for As <br /> 16 <br /> 14 1/13/21 Sample MW-6 <br /> (Outlier) <br /> 12 Nat.BackgrOUnd 11.2 <br /> 10 <br /> W z <br /> 2 <br /> 6 <br /> MTCA Method A CUL 5 <br /> 4 <br /> 2L <br /> N <br /> `i Maximum Non-Detect Value 1 <br /> 0 <br /> 0 <br /> r MW-6 (D) MW-6 (T) <br /> 0 <br /> a <br /> X <br /> W <br /> 2 <br /> CO <br /> 0 <br /> Notes: <br /> 1.The plots shown depict a statistical evaluation of groundwater data analyzed using EPA's ProUCL software to determine data outliers, if any. Both detected values and non-detect <br /> g results were incorporated into the data set for each well listed. Non-detect results were incorporated by assuming a value equal to the laboratory detection limit. All available Arsenic Arsenic in Groundwater(MW-6): Detected Range <br /> data for groundwater samples from monitoring well MW-6(see Table 1)were used in the statistical calculations(pre-cleanup and post-cleanup). Dissolved(D)and Total(T)data are <br /> presented separately. and Distribution (2/2018 through 7/2021) <br /> 2.The blue-colored shapes(called"Boxes"in this"Box and Whisker Plot")represent the interquartile range(IQR)of the arsenic data for a given well; IQR is a measure of data <br /> $ variability. The longer the vertical"stretch"of each box,the more variable the data are,The two lines extending upward and downward from each box("whiskers")represent the Former Smith Street Sawmill <br /> highest and lowest detected values for each well(largest and smallest values that are within the range of 1.5 x IQR). Dots represent data points which are statistically considered Everett, Washington <br /> a outliers(greater than or less than 1.5 x IQR), if any. <br /> Q 3.This drawing is for information purposes. It is intended to assist in showing features discussed in an attached document. GeoEngineers, Inc.cannot guarantee the accuracy and <br /> content of electronic files.The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication. G EO E NG I N E E RFigure 8 <br /> i? <br />