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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9669 <br /> X1,7 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <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 .teff Monroe OC Sample Group 9408596-01-4 Reported Aug 15, 1994 <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- C Donohue C Donohue C Donohue C Donohue <br /> MS/MSD <br /> Batch# 940846606 940846606 940846606 940846606 <br /> Date Prepared 8/11/94 8/11/94 8/11/94 8/11/94 <br /> Date Analyzed 8/11/94 8/11/94 8/11/94 8/11/94 <br /> Instrument II D # GCHP-7 GCHP 7 GCHP-7 GCHP-7 <br /> Conc Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br />. Matrix Spike <br /> % Recovery 90 90 95 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 90 90 90 <br /> Relative % <br /> Difference 00 00 5 4 22 <br /> LCS Batch# - - - - <br /> Date Prepared <br /> Date Analyzed - <br /> Instrument I 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 />• 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 0 <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 /> Vickie Tague Clark <br /> Project Manager 9408596 TTT <2> <br /> DO% <br />