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Sequoia 680 Chesapeake Drive Redwood City,CA 940 1415] 364-96U( FAX (415; 364.9233 <br /> �5) �� 404 N.Wiget Lane Walnut Creek,CA 945 (510) 988.9600 FAX(510)988.9673 <br /> l� Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> ::::.:::.::..::::.:..:- <br /> Touchstone Developments Client Project ID: 9-1452, Chevron 9-1452 <br /> ;::5807 Balboa Drive Matrix: Solid <br /> ::Oakland, CA 94611 z <br /> :,:,Attention: Robert Mallory .:; Work Order# 9509100-17, 18 <br /> Reported: Oct 6 1995<> <br /> p <br /> .....................:................:. <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> OC Batch#: GCO928958TEXEXC GC09281a5BTEXEXC GC092s95BTExDCC GCO92895STEXEXC <br /> Analy, Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: G.Garcia G.Garcia G.Garcia G.Garcia <br /> MS/MSD#: 9509D6313 9509/36313 9509136313 9509/36313 <br /> Sample Conc.: N.D. N.D. N.D. N.D. <br /> Prepared Date: 9/28/95 9/28/95 9/28/95 9/28/95 <br /> Analyzed Date: 9/28/95 9/28/95 9/28/95 9/29/95 <br /> Instrument I.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 /> Result: 0.16 0.16 0.16 0.49 <br /> MS % Recovery: 80 8o 80 82 <br /> +•/ Dup. Result: 0.16 0.16 0.16 0.48 <br /> MSD % Recov.: 80 80 80 so <br /> RPD: 0.0 0.0 0.0 2.1 <br /> RPD Limit: 0-50 0-50 0.50 0-50 <br /> LCS #: <br /> Prepared Date: <br /> Analyzed Date: <br /> Instrument I.D.#: <br /> Conc. Spiked: - <br /> LCS Result: <br /> LCS% Recov.: <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 UOIA 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 /> Mark J. Cargasacchi <br /> Project Manager *•MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9509400,TTT <4> <br />