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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(6517)364-92'53 <br /> Q Sequoia 404 N W1set 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 /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> e <br /> Blaine Tech Services Client Project 1D Shell 6131 Pacific Ave <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9902D75-04 Reported Mar 29, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Matrix Liquid <br /> Method EPA 8020 <br /> -- Analyst BTF -----..— �—� � — -------- -- --- <br /> ANALYTE Benzene Toluene Ethylbenzene Xylenes <br /> I <br /> QC Batch # GC031099BTEX03A <br /> Sample No GW9903120-01 MS <br /> Date Prepared 3110/99 3/10/99 3110199 3/10199 <br /> Date Analyzed 3110/99 3110/99 3110199 3/10199 <br /> instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Sample Cone , ug/L N D N D N D N D <br /> Cone Spiked, ug/L 10 10 10 30 <br /> Matrix Spike, ug/L 9 4 9 2 9 2 28 <br /> % Recovery 94 92 92 93 • <br /> Matrix <br /> Spike Duplicate ug/L 9 5 9 3 9 3 28 <br /> % Recovery 95 93 93 94 <br /> Relative % Difference 1 1 1 1 1 1 1 1 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 -� -- - --- -� T- <br /> LCS Batch# GWLCS031099A <br /> Date Prepared 3110/99 3/10199 3/10/99 3110/99 <br /> Date Analyzed 3/10/99 3/10199 3/10/99 3110/99 <br /> Instrument I D # GCHP03 GCHP03 GCHP03 GCHP03 <br /> Cone Spiked uglL 10 10 10 30 <br /> LCS Recovery, ugiL 9 8 9 5 9 6 29 <br /> LCS % Recovery 98 95 96 95 <br /> Percent Recovery Control Limits <br /> MS/MSD 60140 60140 60140 60140 <br /> LCS 70130 70130 70 130 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 /> SEQUOIA 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 /> T the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Y{� interference the LCS recovery is to be used to validate the batch <br /> Kay, arrKimy i <br /> Project Ma ger <br />