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Page: 8 <br /> IT ANALYTICAL SERVICES <br /> Company: IT Corporation, Martinez SAN JOSE, CA <br /> Date: 01/21/92 <br /> Client Work ID: 190916 Pac Sell Stockton Work Order: T1-12-147 <br /> tTEST CODE BTSX TEST NAME BTEX <br /> The method of analysis for volatile aromatics is taken from E.P.A. <br /> Methods 602 and 8020. Samples are examined using the purge and trap technique. _ <br />' Final detection is by gas chromatography using a photoionization detector. <br />' TEST CODE QC TEST NAME Quality Control <br /> Quality control (QC) samples are analyzed and used to assess the <br /> laboratory control measures. Routine QC samples include method blanks, spikes <br /> and duplicates. The purpose of the method blank (MB) analysis is to demonstrate <br /> that artifacts of the test do not yield false positives. The laboratory control <br /> spike (LS) and /or matrix spike (MS) analysis is used to evaluate the ability of <br /> the test to recover analytes of interest, i.e. accuracy. Accuracy is expressed <br /> as percent (%) recovery. The laboratory spike duplicate (LSD) , matrix spike <br /> duplicate (MSD) , or duplicate sample (DUP) is used to determine the precision <br /> of the test, by comparing the result from the original spike (or sample) to the <br /> duplicate spike (or sample) . Precision is expressed as relative percent <br /> difference (RPD) . <br /> The results of appropriate QC samples from QC batches associated <br /> with the listed samples are included in this report. <br />' TEST CODE TPHN TEST NAME TPH High Soiling by 8015 <br /> The method of analysis for high boiling hydrocarbons s taken from the <br /> LUFT field manual. Samples are extracted with solvent and examined by <br /> gas chromatography using a flame ionization detector. Results in soils are <br /> corrected for moisture content and are reported on a dry soil basis unless <br /> otherwise noted. <br /> 682189 <br />