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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Wainut Creek,CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> fly Analytical 819 Sinker Avenue Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> Touchstone Developments VClient Project ID Chevron 9-8264/8264-1 v n <br /> 6280 Stoneridge Mall Rd , B211 Matrix Solid <br /> Pleasanton, CA 94588 <br /> Attention Anne Marie Dockstader Work Order# 9511554 -01-03 Reported Nov 14, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte. Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> CC Batch# GC110895BTEKEX13 GC110895BTEXEXB GC1108958TEXIX3 GC110895BTEXEXB <br /> Analy Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep Method: EPA 50.30 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst' E Cunanan E Cunanan E Cunanan E Cunanan <br /> MS/MSD #: 951114505 951114505 951114505 951114505 <br /> Sample Conc.- N D N D N D N D <br /> Prepared Date 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Analyzed Date: 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Instrument I D.#• GCHP1 GCHP1 GCHPi GCHP1 <br /> Conc Spiked. 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> Result 018 018 019 056 <br /> MS %Recovery: 90 90 95 93 <br /> Dup. Result: 018 018 019 056 <br /> MSD% Recov.: 90 90 95 93 <br /> RPD: 00 00 00 00 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> LCS #: BLK110995 BLK110995 BLK110995 SLK110995 <br /> Prepared Date: 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Analyzed Date: 11/8/95 11/8/95 11/8/95 11/8/95 <br /> Instrument 1 D.#* GCHP1 GCHP1 GCHP1 GCHP1 <br /> Conc. Spiked: 0 20 mg/Kg 0 20 mg/Kg 0 20 mg/Kg 0 60 mg/Kg <br /> LCS Result: 020 020 020 060 <br /> LCS % Recov • 100 100 100 100 <br /> MS/MSD <br /> LCS <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 /> SE Cargasacchr <br /> OJA 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 /> M <br /> interference,the LCS recovery is to be used to validate the batch <br /> Project Manager **NIS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9511554 TTT <1> <br />