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' Section 9 <br /> ONSITE Environmental Laboratories, Inc Recision 0 <br /> ' Quahry Assurance Plan February 15, 1996 <br /> Page 1 of 2 <br /> ' 9.0 LIMITS OF DETECTION <br /> 91 Definitions <br /> 9 1 1 Instrument Detection Limit <br /> ' The Instrument Detection Limit (IDL) is the minimum concentration of a <br /> substance that can be identified on the instrument, without any additional <br /> extraction, digestion, or processing, with a 99% confidence level that the <br /> detection is not a false positive Unless the specific method requires it, or a <br /> client or certifying agency requests it, the laboratory does not routinely <br /> ' perform IDL deterrrunations <br /> 9 1 2 Method Detection Limit <br /> ' The Method Detection Lirrut (MDL) is defined as the minimum concentration <br /> of a substance in a clean sample with no significant matrix interferences that <br /> can be identified and reported with a 99% confidence level that the detection is <br /> not a false positive The MDL is reported as the concentration of a substance <br /> in a given matrix which has been extracted, digested, or processed in the same <br /> manner as an actual sample <br /> Laboratory MDLs are regularly being revised as new instrumentation and <br /> equipment is brought on line and as SOPs are updated The laboratory's <br /> ' current MDLs are available upon request <br /> 9 1 3 Practical Quantitation Limit <br /> ' The Practical Quantitation Limo (PQL) is defined as the minimum <br /> concentration of a substance in a clean sample with no significant matrix <br /> ' interferences that may be quantified and reported with a specified accuracy <br /> The QAL is often derived by selecting a random multiplier and multiplying the <br /> MDL by that factor The PQL is reported as the concentration of a substance <br /> ' in a given matrix which has been extracted, digested, or processed in the same <br /> manner as an actual sample <br /> ' PQLs meet regulatory requirements, but may be elevated for samples with high <br /> matrix interferences <br /> t <br /> Word 6 0\oc[=9 doc <br />