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~~i <br />CORE LABORATORIES <br />Q U A L I T Y A S S U R A N C E M E T H O D S <br />R E F E R E N C E S A N D N O T E S <br />Report Dale: 10/08/97 <br />Core Laboratories - Gutf States - Houston, iX • HE <br />Lore Labora[ori es - Houston, TX • HP <br />Core Laboratories - Indianapolis, IN ' IN <br />Lore Laboratories - Lake Charles, LA • LL <br />Lore Laboratories - Long Beach, CA • LB <br />Core Laboratories -Tampa, FL • TP <br />Core Laboratories - Valparaiso, IN • VP <br />Other Subcontract Laboratories • Xx <br />EXPLANATION OF DATA QUALIFIERS - 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 quanta cation limit of The <br />method. <br />E - This qualifier indicates that a sample result is an <br />estimate because the concentration exceeded the upper <br />calibration range of the instrument. <br />EXPLANATION OF DATA DUALI FIERS - METALS & INORGANIC PARAMETERS <br />U - This qualifier indicates that the analyte was analyzed <br />for cwt 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 />EXPLANATION OF DATA FLACS - ALL PARAMETERS <br />B - This flag indicates that an analyte 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 sarrylle 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 quality 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 irdicat es a relative percent difference for <br />a duplicate analysis is outside quality control <br />limits. <br />- This flag indicates a percent recovery for a sxanda rd <br />is outside quality control limits. <br />Page 3 <br /> <br /> <br /> <br />