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laboratory must investigate sufficiently to determine that poor precision is not due to a laboratory error and <br /> report the results with appropriate qualifiers and/or comments. <br /> 12 . For all organic analyses using either gas chromatography or HPLC, analytes with concentrations above the <br /> method detection limit shall be confirmed by at least one of the qualitative identification measures listed below. <br /> Confirmation must occur the first time an analyte is detected at a sampling point. <br /> ► Second column/same detector <br /> ► Second column/alternate detector <br /> ► Same column/alternate detector <br /> ► Mass spectrometry <br /> ► Alternate wavelength <br /> REMAINDER OF PAGE INTENTIONALLY LEFT BLANK <br /> Revision Date: 02/09 <br /> DEP Agreement No. G0353, Attachment J, Page 8 of 14 <br />