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oia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequ404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical <br /> Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analyti cal 1455 McDowell Blvd North,Ste D 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 /> Cambria Client Project ID Shell 341 Main St , Ripon <br /> 1 144 65th St Suite C <br /> Oakland, CA 94608 <br /> Attention Owen Ratchye QC Sample Group 9902E24-01-03,09-17 Reported Mar 19, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Solid <br /> Method EPA 8020 <br /> Analyst R GECKLER <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> QC Batch# GCO30999BTEXEXA <br /> Sample No 9902E24-9 <br /> Date Prepared 3/9199 319/99 319/99 319199 <br /> Date Analyzed 3/9/99 319199 319199 3/9199 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Sample Conc , mg1Kg N D N D N D N D <br /> Conc Spiked, mg/Kg 0 20 020 020 020 <br /> Matrix Spike, mg/Kg 0 21 022 022 070 <br /> % Recovery 105 110 110 350 <br /> Matrix <br /> Spike Duplicate, mg/Kg 0 21 022 022 070 <br /> % Recovery 105 110 110 350 <br /> I <br /> Relative % Difference 00 00 0 0 0 0 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GCO30999BTEXEXA <br /> Date Prepared 319199 319199 319199 3/9/99 <br /> Date Analyzed 319/99 3/9199 3/9199 319199 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked, mg/Kg 020 020 020 060 <br /> Recovery, mg/Kg 022 022 022 064 <br /> LCS % Recovery 110 110 110 107 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60-140 60140 60140 <br /> [7— 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 /> �EQUOIA ANALYTICAL 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 /> 1 Z the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> 11 interference the LCS recovery is to be used to validate the batch <br /> Ican Kimyai <br /> Project Manager <br /> i <br />