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<br />~I~~~I <br /> <br />CORE LABORATORIES <br />DUAL I T Y A S S U R A N C E M E T H O D S <br />REFERENCE 5 A N D N O T E S <br />Report Dete: 07/27/98 <br />Lore Laboratories - Gulf States - Houston, T% • NE <br />Lore Labora [ori es - Houston, T% + HP <br />Lore Laboratories - Indianapolis, IN ` IN <br />Lore Laboratories - Lake Charles, LA • LC <br />Core Laboratories - Long Beach, CA ` LB <br />Core Laboratories - Tampa, FL • iP <br />Lore Laboratories - Valparaiso, IN • VP <br />Other Subcontract Laboratories • %% <br />E%PLANATION OF DATA DUALI FIERS - ORGANIC PARAMETERS <br />U - This qualifier indicates that the analyte was analyzed <br />for but not detected. <br />J - This qualifier indicates that the value is an estimate. <br />It is used when a compound is determined to be present <br />based on the mass spectral data but at a concentration <br />less than the practical quantitation limit of the <br />method. <br />E - This qualifier indicates that a sanple result is an <br />estimate because the concentration exceeded the upper <br />calibration range of The instrument. <br />EXPLANATION OF DATA OUALI FIERS - METALS 8 INORGANIC PARAMETERS <br />U - This qualifier indicates that the analyte was analyzed <br />for but not detected. <br />B - This qualifier indicates that the analyte was detected <br />at a level below the reporting Limit but greater than <br />or equal to the instrument detection Limit. <br />E%PLANATI ON OF DATA FLAGS - ALL PARAMETERS <br />B - This flag indicates that an ana Lyle is present in <br />the method blank as well as in the sample. The client <br />should consider this when evaluating the data. <br />E - This flag indicates the reported value is estimated due <br />to sample matrix interference. <br />W - This flag indicates that a post-digestion spike for <br />GFAA analysis is outside quality control limits. <br />X - This flag indicates that a surrogate recovery is <br />outside quality control limits. <br />Y - This flag indicates a spike or spike duplicate recovery <br />is outside quad ty control Limits. <br />Z - This flag indicates a relative percent difference for <br />a spike and spike duplicate is outside quality <br />control limits. <br />' - This flag indicates a relative percent difference for <br />a duplicate analysis is outside quality control <br />limits. <br />- This flag indicates a percent recovery for a standard <br />is outside quality control limits. <br />Page 5 <br /> <br />