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• r Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 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 /> ~ , <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> 1551 Industnal Road San Carlos,CA 94070-4111 (650)232-9600 FAX(650)232 9612 <br /> Blame Tech Services, Inc Client Project ID Shell 107 North Main Street <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9901 E85-01-03 Reported Feb 22, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes BTEX as TPH <br /> Benzene <br /> QC Batch# GCO20799802002-A GCO20799802002A GCO20799802002-A GCO20799802002A GCO20799802002A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst C Westwater C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD# 9020287 9020287 9020287 9020287 9020287 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 2/7/99 2/7/99 2/7/99 2/7/99 2/7/99 <br /> Analyzed Date 2/7/99 2/7/99 2/7/99 2/7/99 2/7/99 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Cone Spiked 20Ng/L 20pg/L 20,ug/L 60Ng/L 290 pg/L <br /> Result 16 16 16 58 320 <br /> MS % Recovery 80 80 80 93 110 <br /> Dup Result 18 18 18 60 310 <br /> MSD %Recov 90 90 90 100 107 <br /> RPD 118 118 118 34 32 <br /> RPD Limit 0-20 0-20 0-20 0-20 0-50 <br /> LCS # LCS020799 LCS020799 LCS020799 LCS020799 LCS020799 <br /> Prepared Date 2/7/99 2/7/99 2/7/99 2/7/99 2/7/99 <br /> Analyzed Date 2/7/99 2/7/99 2/7/99 2/7/99 2/7/99 <br /> Instrument I D # HP2 HP2 HP2 HP2 HP2 <br /> Cone. Spiked 20lrg/L 20 yg/L 20)!g/L 60 jtg/L 290 pg/L <br /> LCS Result 19 18 19 63 310 <br /> LCS %R@COV 95 90 95 105 107 <br /> 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70.130 70-130 50-150 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> Elap#1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> y 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 matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Oyuan yal <br /> Project Manager ""MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9901E85 BILA <2> <br />