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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4 15) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> VAJr Analytical 8t9 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-4183 /9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604850 01, 02 Reported Apr 25, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Dichloro- Tnchloro- Chloro- <br /> ethene ethane benzene <br /> QC Batch# GCO410968010EXA GC0410968010ExA GC0410968010EM <br /> Analy Method EPA 8010 EPA 8010 EPA 8010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5630 <br /> Analyst A.L1 A.U A.I1 <br /> MS/MSD# 960457501 960457501 960457501 <br /> Sample Cone N D N D N D <br /> Prepared Date 4/10/96 4/10/96 4/10/96 <br /> Analyzed Date 4/11/96 4/11/96 4/11/96 <br /> Instrument I D # GCHP9 GCHP9 GCHP9 <br /> Cone Spiked 25ug/Kg 25ftg/Kg 25Pg/Kg <br /> Result 20 23 1700 <br /> MS % Recovery 80 92 6800 <br />. Dup Result 16 17 840 <br /> MSD % Recov 64 68 3360 <br /> RPD 22 30 68 <br /> RPD Limit 0-50 0-50 0-50 <br /> LCS #. BLK041596 BLK041596 BLK041596 <br /> Prepared Date 4/12/96 4/12/96 4/12/96 <br /> Analyzed Date 4/15/96 4/15/96 4/15/96 <br /> Instrument I D # GCHP9 GCHP9 GCHP9 <br /> Cone Spiked 25 Mg/Kg 25pig/Kg 25,ug/Kg <br /> LCS Result 25 27 22 <br /> LCS % Recov 100 108 88 <br /> LCS 30-140 40-130 40-130 <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 empleyed for the samples The matrix spike is an aliquot ofsample <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 /> Kevin Follett **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Project Manager 9604850TTT <2> <br />