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Sequoia 660 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 Irl Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> loo Analytical 8 i 9 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-2033, 2033-2 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe Work Order# 961OB27 01-12 Reported Oct 23, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch# GC102196BTEXEXA GC102196BTEXEXA GC102-196BTEXEXA GC102196BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst Porter Porter Porter Porter <br /> MS/MSD # 961OA7409 961OA7409 961OA7409 961OA7409 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 10/21/96 10/21/96 10/21/96 10/21/96 <br /> Analyzed Date 10/21/96 10/21/96 10/21/96 10/21/96 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 018 016 016 048 <br /> S % Recovery 90 80 80 80 <br /> 4w 1 <br /> Dup Result 018 016 015 047 <br /> MSD% Recov 90 80 75 78 <br /> RPD 00 00 65 21 <br /> RPD Li m rt 0-25 0-25 0-25 0-25 <br /> i <br /> LCS # BLK102196 BLK102196 BLK102196 BLK102196 <br /> Prepared Date 10/21/96 10/21/96 10/21/96 10/21/96 <br /> Analyzed Date 10/21/96 10/21/96 10/21/96 10/21/96 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result 021 019 018 055 <br /> LCS % Recov 105 95 90 92 <br /> 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 /> OU IA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantrties 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 <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 961OB27 TTT <1 <br />