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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Crede CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> rN � n .AA <br /> Blaine Tedi Services, Inc Client Project ID Shell Stockton 971009-G1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> :Attention Fran 7hie Work Order # 9710593-13 Reported Oct 28, 1997 <br /> (QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC1021978TEX02A GC102197BTEX02A GC102197BTEX02A GC102197BTEX02A GC102197BTEX02A <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA S015M <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: A-Miraftab A.Miraftab A.Miraftab A.Miraftab A-Miraftab <br /> MS/MSD #• 971098003 971098003 971098003 971098003 971098003 <br /> Sample Conc N D N D N D N D N D <br /> Prepared Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Analyzed Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Instrument I D.#. GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc Spiked 10,ug/1- 10ug/L 10pg/L 30pg/1- 60frg/L <br /> Result: 97 94 95 29 63 <br /> MS % Recovery 97 94 95 97 105 <br /> 0 Dup Result 99 95 96 29 64 <br /> MISD %Recov - 99 95 96 97 107 <br /> RPD 20 11 10 00 16 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS #- BLK102197 BLK102197 BLK102197 BLK102197 BLK102197 <br /> Prepared Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Analyzed Date 10/21/97 10/21/97 10/21/97 10/21/97 10/21/97 <br /> Instrument I-D.# GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Conc.Spiked 10pg/L 10 jig/L 10pg/L 30lig/L 60pg/L <br /> LCS Result 91 87 89 27 60 <br /> LCS %Recov.. 91 87 89 90 100 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent4ree matrix that 1s analyzed using the same reagents, <br /> A ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike 1s 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 Clue to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> P y Penner <br /> 7Pr ject Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9710591 BLA <4> <br />