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X680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> NSequoia 404 N Wlget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> �,1,�► Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921 9600 FAX(916)921 0100 <br /> 1455 McDowell Blvd North Ste 0 Petaluma.CA 94954 (707)792-1865 FAX(707)792 0342 <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650)232 9600 FAX(650)232-9612 <br /> Blaine Tech Services Client Project ID Shell 620 W Charter Way <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9902875-08 Reported Mar 3 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> Analyst TLP <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GCO22599BTEX03A <br /> Sample No GW9902A26-02 <br /> Date Prepared 2125199 2125199 2/25199 2125199 <br /> Date Analyzed 2125199 2/25199 2125199 2125199 <br /> Instrument I D# GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Conc, ug/L N D N D N D N D <br /> Conc Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, uglL 84 85 85 25 <br /> % Recovery 84 85 85 85 <br /> Matrix <br /> pike Duplicate, ug/L 87 88 88 27 <br /> % Recovery 87 88 88 88 <br /> elative% Difference 35 35 35 35 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GCO22599BTEX03A <br /> Date Prepared 2125199 2/25199 2125/99 2125/99 <br /> Date Analyzed 2125199 2125199 2125/99 2125199 <br /> Instrument I D# GCHP03 GCHP03 GCHP03 GCHP03 <br /> Conc Spiked, ug/L 10 10 10 30 <br /> LCS Recovery, ug1L 93 94 96 28 <br /> LCS %Recovery 93 94 96 95 <br /> Percent Recovery Control Limits <br /> F- <br /> MS/MSD 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Quality Assurance Statement All standard operating procedures and quality control requirements have been met <br /> Please Nate <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SejectManagaer <br /> YTICAL 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 matnx <br /> interference the LCS recovery is to be used to validate the batch <br />