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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)92.1 0100 <br /> Blame Tech Services Client Project ID Chevron 9-86321980610-L1 <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9806741-05 Reported Jun 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 418 1 <br /> Analyst P SANDROCK <br /> ANALYTE TRPH <br /> QC Batch# IN062298418100A <br /> Sample No LCS062298 <br /> Date Prepared 6122198 <br /> Date Analyzed 6122198 <br /> Sample Cone mg/L N D <br /> Cone Spiked, mg/L 3 5 <br /> LCS Spike, mg/L 35 <br /> % Recovery 100 <br /> Matrix <br /> LCS Duplicate mg/L 36 <br /> % Recovery 103 <br /> Relative % Difference 3 0 <br /> RPD Control Limits 0-20 <br /> LCS Batch# LCS062298 <br /> Date Prepared 6122198 <br /> Date Analyzed 6/22/98 <br /> Cone Spiked, mg/L 35 <br /> LCS Recovery, mg/L 3 5 <br /> LCS % Recovery 100 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 <br /> LCS 70 130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> WtMg,,rag., <br /> YTICAL preparation and analvticsi methods employed for the samples The matrix spike is an aliquot of sample <br /> 0 fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br />