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<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 Date: 08/23/97
<br />Core Laboratories - Gulf States - Houston, TX ' HE
<br />Core Laboratories -Houston, iX • HP
<br />Core Laboratories - Indianapolis, IN ` IN
<br />Lore Laboratories - Lake Charles, LA • LC
<br />Core 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 compouM 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 sample result is an
<br />estimate because the concentration exceeded the upper
<br />calibration range of the ins [runent.
<br />E%PLANATIOH OF DATA QUALIFIERS - METALS 8 INORGANIC PARAMETERS
<br />U - This qualifier iMicates [hat [he analyte was analyzed
<br />for but not detected.
<br />8 - 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 FLAGS - 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 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 iMicates a spike or spike duplicate recovery
<br />is outside quality control limits.
<br />2 - This flag indicates a relative percent difference for
<br />a spike aM spike duplicate is outside quality
<br />control limits.
<br />• - This flag iMicates 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 quaLi ty control limits.
<br />Page 3
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