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limit was not established and footnoted as to why. <br /> Nonstatistical Approach <br /> When the background data set contains 100 percent nondetect values, Sanitas applies the <br /> nonstatistical approach. This approach takes into consideration that if historically a constituent <br /> has not been detected, any detection of that constituent would be considered an exceedance. <br /> Thus, in these situations (100 percent nondetected values),the tolerance limit is set at"detect", <br /> meaning that if a value is detected above its method detection limit, this value is an exceedance <br /> of the concentration limit. <br />