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Sequoia 680 Chesapeake Dnve 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 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 92t 9600 FAX (916)921 0100 <br /> Touchstone Development Client Project ID 8632-2, Chevron 9-8632 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe OC Sample Group 940-8829 -01-4 Reported <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# 940882301 940882301 940882301 940882301 <br /> Date Prepared 8/16/94 8/16/94 8/16/94 8/16/94 <br /> Date Analyzed 8/16/94 8/16/94 8/16/94 8/16/94 <br /> Instrument I D # GCHP18 GCHP18 GCHP18 GCHP18 <br /> Conc Spiked 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Matrix Spike <br />-• % Recovery 95 100 100 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 95 95 <br /> Relative % <br /> Difference 00 51 51 51 <br /> LCS Batch# - - _ _ <br /> Date Prepared _ <br /> Date Analyzed _ <br /> Instrument I D # <br /> LCS % <br /> Recovery - - - _ <br /> % ecovery <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 /> P , f�ague Clark fortified with known quantities of specific compounds and subjected to the entire analytical procedure if <br /> Cthe recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Vickie T <br /> interference,the LCS recovery Is to be used to validate the batch <br /> Project Manager 9408829 TTT <2> <br /> mak, <br />