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` Sequoia 680 Chesapeake Drive Redwood Cay,CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 41� 404 N Wigct 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 /> Blaine Tech Seances, Inc Client Project ID Shell Stockton /970905-F1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9709144-03 Reported Sep 10, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Dichloroethene Trichloroethene Benzene Toluene Chloro- <br /> benzene <br /> OC Batch# MS0907978260H6A MS0907978260H6A MS09079782601-16A MS0907978260H6A MS0907978260H6A <br /> Analy Method EPA 8260 EPA 8260 EPA 8260 EPA 8260 EPA 8260 <br /> Prep Method NA NA. NA NA NA. <br /> Analyst L Zhu L Zhu L Zhu L Zhu L Zhu <br /> MS/MSD# 970BG4301 970864301 9708G4301 970864301 970BG4301 <br /> Sample Cone N D N D N D N D N D <br /> Prepared Date 9/7/97 9/7/97 9/7/97 9/7/97 9/7/97 <br /> Analyzed Date 9/7/97 9/7/97 9/7/97 9/7/97 9/7/97 <br /> Instrument 1 D # H6 H6 H6 H6 H6 <br /> Cone Spiked 50pg/L 50pg/L 50ug/L 50gg/L 50ug/L <br /> Result 46 46 49 46 47 <br /> �S % Recovery 92 92 98 92 94 <br /> Dup Result 45 45 49 45 46 <br /> MSD % Recov 90 90 98 90 92 <br /> RPD 22 22 00 22 22 <br /> RPD Limit 0-25 0-25 025 0-25 0-25 <br /> LCS # VDBO90797 VDBO90797 VDBO90797 VDBO90797 VD8090797 <br /> Prepared Date 9/7/97 9/7/97 9/7/97 9/7/97 9/7/97 <br /> Analyzed Date 9/7/97 9/7/97 9/7/97 9/7/97 9/7/97 <br /> Instrument I D # H6 H6 H6 H6 H6 <br /> Cone Spiked 50 ug/L 50 ug/L 50 ug/L 50 pg/L 50 ug/L <br /> LCS Result- 45 46 49 48 47 <br /> LCS % Recov 90 92 98 96 94 <br /> 60-140 60-140 60-140 60-140 50-140 <br /> LCS 65-135 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 /> I 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 /> egg enner **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference <br /> o t Manager 9709144 BLA <6n <br />