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Section 13 <br /> ONSITE Environmental Laboratories inc: Revision 0 <br /> Quality Assurance Plan February 15, 1995 <br /> Page l of 1 <br /> 13.0 HOLDING TIMES AND PRESERVATIVES <br /> Holding tunes and proper preservation of samples are critical to meeting method and <br /> ' regulatory compliance Analytes may degrade and be lost from the sample over time, even if <br /> they are properly preserved and stored All analytes have a required or recommended holding <br /> time <br /> ' ONSITEs holding time clock starts at the time of sampling and ends with the beginning of the <br /> analysis procedure <br /> Since assorted regulations comtnonly conflict in terms of sample containers, holding times and <br /> preservation, ONSITE consults the appropriate regulatory reference prior to issuing sample <br /> containers ONSITEs most frequently used requirements are shown in Appendix B <br /> 1 i <br /> Word 6 0 loelsecO doc <br />