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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 /> V60 Analytical 819 Sinker Avcnue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Touchstone Developments Client Project ID Chevron 9-4183 /9-4183 <br /> 781 Kingston Matrix Solid <br /> Oakland, CA 94611 <br /> Attention Robert Mallory Work Order# 9604750 01-06 Reported Apr 15, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch# GCO41196BTEXEXA GCO41196BTEXEXA GC041196BTEXEXA GC041196BTEXEXA <br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst D Jlrsa D Jlrsa D Jrrsa D Jtrsa <br /> MS/MSD# 960439811 960439811 960439811 960439811 <br /> Sample Cone N D N D N D N D <br /> Prepared Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Analyzed Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 016 017 017 051 <br /> MS % Recovery so 85 85 85 <br /> Dup Result 016 017 017 0 50 <br /> MSD % Recov 80 85 85 83 <br /> RPD 00 00 00 20 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS# BLK041196 BLK041196 BLK041196 BLK041196 <br /> Prepared Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Analyzed Date 4/11/96 4/11/96 4/11/96 4/11/96 <br /> Instrument I D # GCHP1 GCHP1 GCHP1 GCHP1 <br /> Cone Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result 015 G15 015 044 <br /> LCS % Recov 75 75 75 73 <br /> LCS <br /> Control Limits 50-150 50-150 50-150 50-150 <br /> Please Note <br /> The LCS is a control sample of known,Interferent-free matrix that is analyzed using the same reagents, <br /> laxSEQU IA 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 /> Kevin Follett <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative% Difference 9604750 TTT <1> <br />