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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 /> Analytical 819 Striker Avenue Suite 8 Sacramcnto CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Development Client Project 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 Dtchloroethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> QC Batch# MSO410968240EXA MSO410968240EXA MSO4109682400(A 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 960436304 960438304 <br /> Sample Conc 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 /> Conc Spiked 2500 pg/L 2500pg/L 2500pg/L 2500 pg/L 2500,ug/L <br /> Result 1900 2300 2300 2400 2400 <br /> MS % Recovery 76 92 92 96 96 <br /> Dup 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 /> Conc. Spiked 2500pg/Kg 2500,ug/Kg 2500pg/Kg 2500 pg/Kg 2500 pg/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 is a control sample of known,interferent-free matrix that 1s 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 /> interference,the LCS recovery is to be used to validate the batch <br /> vin Follett "*MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> Project Manager 9604898 rTT <1> <br />