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Sequoia 680 Chesapeake Drwe Redwood Gry CA 94063 (415) 364 %00 FAX(415) 364 9233 <br /> Seq <br /> 404 t� Wiget Lane Walnut Creek CA 94598 (510) 983 9600 FAX(510)988 9673 <br /> JJ%„y Analytical 819 5mkcr Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> t E A Engineering Science &Tech Client Project ID Exxon 7-3942 51539421307 <br /> 9 9 t / <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Maria Guensler Work Order# 9604E22 12 Reported May 13, 1996 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte 1 1 Dichloroethene Trichloroethene Benzene Toluene Chloro- <br />' benzene <br /> OC Batch# MSO430968240H6A MSO430968240H6A MSO430968240HeA MSO430968240H6A MSO430968240H6A <br /> Analy Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br />' Prep Method <br /> Analyst M Williams M Williams M Williams M Williams M Williams <br /> MS/MSD# 960411301 960411301 960411301 960411301 960411301 <br />' Sample Conc N D N D N D N D N D <br /> Prepared Date N A N A. N A. N A. N A- <br /> Analyzed Date 4/30/96 4/30/96 4/30/96 4/30/96 4/30/96 <br />' Instrument I D # H6 H6 H6 H6 H6 <br /> Conic Spiked 50irg/L 50ug/L 50ug/L 50ug/L 50,ug/L <br /> Result 39 47 50 53 53 <br /> MS % Recovery- 78 94 100 106 106 <br /> Dup Result 39 47 50 54 52 <br /> MSD %Recov 78 94 100 108 104 <br />' RPD* 00 00 00 19 19 <br /> RPD Limit 0-25 0-25 0-25 0-25 0-25 <br /> LCS # V8050296 VE3050296 VB050296 VB050296 <br /> Prepared Date N A. - N A. N A. N A. N A. <br /> Analyzed Date 5/2/96 5/2/96 5/2/96 5/2/96 4/30/96 <br /> Instrument I D # H6 H6 H6 H6 H6 <br /> Conc Spiked 50ug/L 50ug/L 50Ng/L 50ug/L <br /> LCS Result 42 46 52 54 52 <br /> LCS % Recov 84 92 104 108 104 <br /> 60-140 60.140 60-140 6x140 60-140 <br /> LCS 65-135 70.130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS 1s 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 at specific compounds and subjected to the entire analytical procedure If <br /> 4 11 l the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> 4vC 11�� l j interference the LCS recovery is to be used to validate the batch <br /> Kevin Follett MS=Matrix Spike,MSD-MS Duplicate, RPD=Relative% Difference <br /> Project Manager <br /> 9604E22 FEE <5> <br />