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