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'�. Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404N 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 9640 FAX (916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Shell Stockton /961126-A1 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Fran Thie Work Order# 9611125 -01-02 Reported Dec 11, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC120996BTEX17A GC12-0996BTEX17A GC120996STEX17A GC120996BTEX17A <br /> Anally Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method. EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst. A Miraftab A Miraftab A Miraftab A Miraftab <br /> MS/MSD #: 961 i H7222 9611 H7222 9611 H7222 9611H7222 <br /> Sample Conc : N D N D N D N D <br /> Prepared Date- 12/9/96 12/9/96 12/9/96 12/9/96 <br /> Analyzed Date 12/9/96 12/9/96 12/9/96 12/9/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10 pg/L 10 us/L 10 us/L 30 p9/1- <br /> Result <br /> s/LResult 98 10 10 30 <br /> MS % Recovery 98 100 100 100 <br />• Dup Result 98 10 10 31 <br /> MSD %Recov 98 100 100 103 <br /> RPD 00 00 00 33 <br /> RPD Limit* 0-25 0-25 0-25 0-25 <br /> LCS #- BLK120996 BLK120996 BLK120996 BLK120996 <br /> Prepared Date 12/9/96 12/9/96 12/9/96 12/9/96 <br /> Analyzed Date' 12/9/96 12/9/96 12/9/96 12/9/96 <br /> Instrument I D # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc Spiked 10pg/L 10pg/L 10yg/L 30Ng/L <br /> LCS Result 91 94 99 29 <br /> LCS %Recov. 91 94 99 97 <br /> MS/MSD 60-140 60-140 60-140 60-140 <br /> LCS 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 /> OltA 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 /> nn Manager *"MS=Matrix Spike MSD=MS Duplicate, RPD=Relative%Difference 9611125 BLA <1> <br />