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HEURESIS PCS December 2015 <br /> CLASSIFICATION OF RESULTS: <br /> XRF results are classified as positive if they are greater than or equal to the stated threshold for the instrument <br /> (1.0 mg/cm2), and negative if they are less than the threshold. <br /> DOCUMENTATION: <br /> A report titled Methodology for XRF Performance Characteristic Sheets (EPA 747-R-95-008) provides an <br /> explanation of the statistical methodology used to construct the data in the sheets,and provides empirical results <br /> from using the recommended inconclusive ranges or thresholds for specific XRF instruments. The report may <br /> be downloaded at http://www2.epa.gov/lead/methodology-xrf-performance-characteristic-sheets-epa-747-r-95- <br /> 008-september-1997. <br /> This XRF Performance Characteristic Sheet(PCS)was developed by QuanTech, Inc., under a contract with the <br /> XRF manufacturer. <br /> Page 4 of 4 <br />