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' Page: 10 <br /> IT ANALYTICAL SERVICES <br /> Company: IT Corporation, Martinez SAN JOSE, CA <br /> Date: 01/21/92 <br /> Client Work ID: 190916 Pac Bell E042 Work Order: T1-12-081 <br /> TEST CODE BTEX TEST NAME BTSX <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 Boiling 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 />