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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 (925)988 9600 FAX(925)988-9673 <br /> Analytical $19 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> 1455 MCD.weil Blvd North Ste D Petaluma CA 94954 (707) 791-1865 FAX(707) 792 0342 <br /> $lame Tech Services Client Project ID Chevron 9 8264/980810-T I <br /> 1680 Rogers Avenue <br /> San Jose CA 95112 <br /> Attention Fran Thie QC Sample Group 9808910 04 Reported Aug 31 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method LPA 8015 <br /> Analvst MM <br /> ANALYTE Gasoline <br /> QC Batch # GC082498BTEX21 A <br /> Sample No GW9808761 02 <br /> Date Prepared 8124198 <br /> Date Analyzed 8124198 <br /> Instrument 1 D # C-CHP21 <br /> Sample Conc uglL N D <br /> Conc Spiked ug/L 250 <br /> Matrix Spike ug/L 260 <br /> % Recovery 104 <br /> Matrix <br /> Spike Duplicate ug/L 260 <br /> % Recovery 104 <br /> Relative % Difference 00 <br /> RPD Control Limits O 25 <br /> LCS Batch# GWLCS082498A <br /> Date Prepared 8124198 <br /> Date Analyzed 8124198 <br /> Instrument I D # GCHP21 <br /> Conc Spiked, ug/L 250 <br /> LCS Recovery ug/L 220 <br /> LCS % Recovery 88 <br /> Percent Recovery Control Limits <br /> MS/MSD 60 140 <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 /> ;SE1Q1fU1031AYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sampie <br /> fornfied 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 fall within specrfsed control limits due to matrix <br /> interference the LCS recovery is to de used to validate the batch <br />