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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical ^819 Strtker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)931 0100 <br /> s <br /> Touchstone Development Client Project ID 8632-2, Chevron 9-8632 <br /> P 0 Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 9408A94 -01-6 Reported Aug 25, 1994 <br /> 11 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst E Cunanan E Cunanan E Cunanan E Cunanan <br /> MS/MSD <br /> Batch# 940880205 940860205 9408BO205 9408BO205 <br /> Date Prepared 8/22/94 8/22/94 8/22/94 8/22/94 <br /> Date Analyzed' 8/22/94 8/22/94 8/22/94 8/22/94 <br /> Instrument I D # GCHP-1 GCHP 1 GCHP 1 GCHP-1 <br /> Conc Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> Matrix Spike <br /> • % Recovery 85 90 90 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 85 90 90 90 <br /> Relative% <br /> Difference 00 00 00 00 <br /> LCS Batch# - <br /> Date Prepared <br /> Date Analyzed - <br /> Instrument 1 D # <br /> LCS % <br /> Recovery - <br /> % Recovery <br /> Control Limits 55-145 47 149 47 155 56-140 <br /> Please Note <br /> The LCS Is a control sample of known,Interferent free matrix that Is analyzed using the same reagents, <br /> 0 SEQUOIA 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 /> VYY 1 Interference the I-CS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 9408A94 TTT 41> <br />