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�! 680 Chesapeake Drive Redwood City CA 940,6.3 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N W1get Lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)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)79Z-1865 FAX(707)79Z-0342 <br /> Blaine Tech Services Client Project ID Shell 6131 Pacific Ave <br /> 1680 Rogers Avenue <br /> San Jose, CA 95112 <br /> Attention Fran Thie QC Sample Group 9902D75-03, 05, 07 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 /> QC Batch # GC031099BTEX30A <br /> Sample No GW9903120-08MS <br /> Hate Prepared 3110199 3110199 3110/99 3110199 <br /> Date Analyzed 3110199 3110/99 3110199 3110199 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <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, ug1L 9 5 9 2 92 28 <br /> • % Recovery 95 92 92 92 <br /> Matrix <br /> Spike Duplicate ug/L 9 9 9 5 9 3 28 <br /> % Recovery 99 95 93 94 <br /> Relative % Difference 4 1 3 2 1 1 2 2 <br /> RPD Control Limits 0-25 0-25 0-25 0-25 <br /> LCS Batch# GWLCS031099A <br /> Date Prepared 3110/99 3110199 3110199 3110199 <br /> Date Analyzed 3110199 3110199 3110199 3/10199 <br /> Instrument I D # GCHP30 GCHP30 GCHP30 GCHP30 <br /> Cone Spiked, ug/L 10 10 10 30 <br /> LCS Recovery ug/L 9 9 9 5 9 3 28 <br /> LCS % Recovery 99 95 93 93 <br /> Percent Recovery Control Limits <br /> LMSlMSD 60140 60140 60140 60140 <br /> LCS 70130 70-130 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 /> �E000IA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> r fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> r the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference the LCS recovery is to be used to validate the batch <br /> Kay �qe, <br /> Prolect M <br />