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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 /> qwr Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> r <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# 9610708 04-09 Reported Oct 19, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GC101496BTEXEXB GC101496BTEXEXB GC101496BTEXEXB GC101496BTEXEXB <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 # 961061202 961061202 961061202 961061202 <br /> Sample Conc. N D N D N D N D <br /> Prepared Date 10/14/96 10/14/96 10/14/96 10/14/96 <br /> Analyzed Date 10/14/96 10/14/96 10/14/96 10/14/96 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/K9 <br /> Result 019 017 016 0150 <br /> �S %Recovery 95 85 80 83 <br /> Dup Result 019 017 016 050 <br /> MSD % Recov. 95 85 80 83 <br /> RPD 00 00 00 00 <br /> RPD Limit 0-25 0-25 0-25 0-25 <br /> LCS# BLK101496 BLK101496 BLK101496 BLK101496 <br /> Prepared Date 10/14/96 10/14/96 10/14/96 10/14/96 <br /> Analyzed Date 10/14/96 10/14/96 10/14/96 10/14/96 <br /> Instrument I D # GCHP22 GCHP22 GCHP22 GCHP22 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result 020 018 017 052 <br /> LCS % Recov 100 90 85 87 <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 /> QUO A 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 1s to be used to validate the batch <br /> Kevin Follett <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9610708 TTT <3> <br /> r� <br />