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esapeake <br /> Redw <br /> City CA <br /> (650)364-9600 FAX(650)364 9233 <br /> Sequoia 404 Nh Wiget LaneDrive Walnut Creek CA 94598 (925)988-9600 FAX(925)988 9673 <br /> 1 819 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 /> ]551 Industrial Road San Carlos CA 94070-4 1 1 1 (650)232-9600 FAX(650)232-9612 <br /> equola Analytical Client Project Ib L904337-Shell Oil Company <br /> 1551 Industrial Blvd Matrix Liquid <br /> San Carlos, CA 94070 <br /> Attention Mike Gregory QC Sample Group 9050264-268 Reported May 10, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-D+chloro- Tnchloro- Chloro- 1,1-Dichloro- Tnchloro- Chloro- <br /> ethene ethene benzene ethene ethene benzene <br /> QC Batch# GCO50599 GC050599 GC060599 GCO50699 GCO50699 GC050699 <br /> 801006A 801006A 801006A 801006A 801006A 801006A <br /> Analy Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst P Kosovskaya P Kosovskaya P Kosovskaya P Kosovskaya P Kosovskaya P Kosovskaya <br /> MS/MSD # 9042686 9042686 9042686 9050264 9050264 9050264 <br /> Sample Colic N D N D N D N D N D N D <br /> Prepared Date 5/5/99 5/5/99 5/5/99 5/6/99 5/6/99 5/6/99 <br /> Analyzed Date 5/5/99 5/5/99 5/5/99 5/$/99 5/6/99 5/6/99 <br /> Instrument I D # HP-6 HP-6 HP-6 HP-6 HP-6 HP-6 <br /> Conc Spiked 20ug/L 20ug/L 20frg/L 20,ug/L 20pg/L 20Ng/L <br /> Result 24 28 25 22 26 22 <br /> MS % Recovery 120 140 125 110 130 110 <br /> Dup Result 22 25 23 22 24 21 <br /> 40 MSD % Recov 110 125 115 110 120 105 <br /> RPD 87 11 83 00 80 47 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 0-25 <br /> LCS # LCS050599 LCS050599 LCS050599 LCS050699 LCS050699 LCS050699 <br /> Prepared Date 5/5/99 5/5/99 5/5/99 5/6/99 5/6/99 5/6/99 <br /> Analyzed Date 5/5/99 5/5/99 5/5/99 5/6/99 5/6/99 5/6/99 <br /> Instrument I D # HP-6 HP-6 HP-6 HP-6 HP-6 HP-6 <br /> Conc Spiked 20pg/L 20pg/L 20ug/L 20Ng/L 20pg/L 20Pg/L <br /> LCS Result 21 23 22 21 21 20 <br /> LCS % Recov 105 115 110 105 105 100 <br /> LCS Result 14 16 17 <br /> LCS. % Recov 70 80 85 j <br /> 60140 60-140 60-140 <br /> LCS 65-135 _ 70-130 70-130 65-135_ 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-tree matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 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 matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Charlie Westwater **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Protect Manager <br /> 9050264 SSS <8> <br />