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Sequoia 6110 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 /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> qW Analytical. 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blame Tech Services Client Project ID Chevron 9-86321980810-T2 <br /> Y 680 Rogers Avenue <br /> San Jose CA 951 12 <br /> Attention Fran Thie QC Sample Group 9808853-02 Reported Aug 31 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst AM <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch # GC082398BTEX30A <br /> Sample No GW9808AB7 04 <br /> Date Prepared 8123198 8123/98 8123198 8123198 <br /> Date Analyzed 8123198 8123198 8123198 8123198 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Sample Cone uglL N D N D N D N D <br /> Cone Spiked uglL 10 10 10 30 <br /> Matrix Spike uglL 10 9 8 9 8 29 <br /> . % Recovery 100 98 98 97 <br /> Matrix <br /> Spike Duplicate ug/L 10 9 9 9 8 29 <br /> % Recovery 100 99 98 97 <br /> Relative % Difference 00 1 0 00 00 <br /> RPD Control Limits 0 25 0 25 0 25 0 25 <br /> LCS Batch# GWLCS082398A <br /> Date Prepared 8/23/98 8/23198 8123198 8123198 <br /> Date Analyzed 8123198 8/23198 8/23198 8123198 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Conc Spiked uglL 10 10 10 30 <br /> LCS Recovery uglL 11 10 10 31 <br /> LCS % Recovery 110 100 100 103 <br /> Percent Recovery Control Limits <br /> Ms/MSD 60140 60140 60140 60140 <br /> LCS 70 130 70130 70 130 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 mterferent free matrix that is analyzed using the same reagents <br /> or <br /> EQUOI LYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and suhlected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference the LCS recovery is to he used to validate the batch <br /> ory <br /> c anagen <br /> 2� <br />