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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek 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 /> Touchstone Development Client Protect ID Chevron 9-4183 <br /> 781 Kingston Matrix Liquid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604898 06, 07 Reported Apr 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte' 1,1-Dichloroethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> OC Batch#- MSO410968240EXA MSO410968240EXA MSO410968240EXA MSO410968240EXA MSO410968240EXA <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#- 960438304 960438304 960438304 960438304 960438304 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 4/10/96 4/10/96 4/10/96 4/10/96 4/10/96 <br /> Analyzed Date 4/10/96 4/10/96 4/10/96 4/10/96 4/10/96 <br /> Instrument I D # F3 F3 F3 F3 F3 <br /> Cone Spiked 2500 yg/L 2500 ug/L 2500 ug/L 2500}1g/L 2500 fig/L <br /> Result 19W 2300 2300 2400 2400 <br /> MS % Recovery 76 92 92 96 96 <br /> iDup Result 2100 2500 2500 2600 2600 <br /> MSD %Recov 84 100 100 104 104 <br /> RPD 10 83 83 80 80 <br /> RPD Limit 0-50 0-50 0-50 0-50 0-50 <br /> LCS# VB041696 VB041696 VB041696 VB041696 VB041696 <br /> Prepared Date 4/16/96 4/10/96 4/10/96 4/10/96 4/10/96 <br /> Analyzed Date. 4/16/96 4/10/96 4/10/96 4/10/96 4/10/96 <br /> Instrument I D #- F3 F3 F3 F3 F3 <br /> Cone Spiked 2500 ug/Kg 2500 fig/Kg 2500 ug/Kg 2500 pg/Kg 2500 ug/Kg <br /> LCS Result- 2100 2400 2400 2600 2500 <br /> LCS %Recov : 84 98 98 104 100 <br /> LCS 40-140 70-140 40-130 40-130 40-140 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known,Interferent-fres matrix that 1s analyzed using the same reagents, <br /> .SEQUOIAANALYTICAL 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 /> vin 4Follett **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager 9604898 TTT <I> <br />