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Sequoia 680 ry 94063 Chesa cake Dnve Redwood Cr CA <br /> P (650) 364 9600 FAX(650)364 9633 <br /> 404 N Wrget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 488 9673 <br /> �rill>� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> E A Engineering Science &Tech Client Project ID Exxon 7-0137, 51501 37 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br /> Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order# 9710816 02 Reported Oct 27, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch# GC102097EITEX02A GC102097BTEX02A GC102097BTEX02A GC102097BTEX02A GC1021978TEX21A <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 /> IAnalyst A Miraftab A Miraftab A Miraftab A Miraftab A. Miraftab <br /> MS/MSD# 971073403 971073403 971073403 971073403 971073403 <br />' Sample Cone N D N D N D N D N D <br /> Prepared Date 10/20/97 10/20/97 10/20/97 10/20/97 10/20/97 <br /> Analyzed Date 10/20/97 10/20/97 10/20/97 10/20/97 10/20/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br /> Cone Spiked 10yg/L 10Ng/L 10pg/L 30pg/L 6011g/L <br /> Result 10 9 7 98 30 60 <br /> MS % Recovery 100 97 98 100 100 <br /> Dup Result 10 98 99 30 62 <br /> MSD %Recov 100 98 99 100 103 <br />' RPD 00 10 10 00 33 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> - <br /> LCS # BLK102097 BLK102097 BLK102097 BLK102097 BLK102097 <br />' Prepared Date 10/20/97 10/20/97 10/20/97 10/20/97 10/20/97 <br /> Analyzed Date 10/20/97 10/20/97 10/20/97 10/20/97 10/20/97 <br /> Instrument I D # GCHP2 GCHP2 GCHP2 GCHP2 GCHP2 <br />' Cone Spiked 10jug/L 10pg/L 10pg/L 30Ng/L 60Ng/L <br /> LCS Result 10 9 8 10 30 61 <br />' LCS % Recov 100 98 100 100 102 <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,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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> t Interference the LCS recovery Is to be used to validate the batch <br /> Richard Herling <br /> Project Manager' MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative % Difference 9710816 EEE <3> <br /> 1 <br />