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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> q 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 /> 1117 Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707) 792-1865 FAX(707)792-0342 <br /> 0 <br /> Blafne Tech Services Client Project ID Chevron 9-42751980624-J1 <br /> 1680 Rogers Avenue <br /> San Jose CA 95112 <br /> Attention Fran Thle QC Sample Group 9806G68-01,03-05,07-10 Reported Jul 9, 1998 <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> I <br /> Analyst B BURTON I <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> J <br /> QC Batch # GCO63098STEX02A <br /> Sample No GW9806HO3-15 <br /> Date Prepared 6/30198 6130198 6130198 6130/98 <br /> Date Analyzed 6130198 6130198 6/30198 6130198 <br /> Instrument f D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Sampfe Conc ug/L N D N D N D N D <br /> Conc Spiked, ug/L 10 10 10 30 <br /> Matrix Spike ug/L 11 10 10 30 <br /> % Recovery 110 100 100 100 <br /> Matrix <br /> Spike Duplicate ug1L 11 10 10 30 <br /> % Recovery 110 100 100 100 <br /> Relative % Difference 00 00 00 00 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWBLK063098ABS <br /> Date Prepared 6/30198 6/30198 6/30/98 6130/98 <br /> Date Analyzed 6/30/98 6130198 6130/98 6/30/98 <br /> Instrument I D # GCHP02 GCHP02 GCHP02 GCHP02 <br /> Conc Spiked, u91L 10 10 10 30 <br /> LCS: Recovery, ug/L 12 11 11 32 <br /> LCS % Recovery 120 110 110 107 <br /> Percent Recovery Control Limits <br /> MSIMSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70130 70130 <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 /> tSWUO TICAL 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 subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to metmc <br /> interference the LCS recovery is to be used to validate the batch <br /> ry <br /> ager <br />