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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364.9600 FAX(650)364-9233 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988.9600 FAX (5 10) 988-9673 Analytical 819 Striker Avenue,Suite 8 Sacramenta,CA 95834 (916) 921.9600 FAX(916)921,0100 .. Blaine Tech Services, Inc. Client Project ID: Chevron 9-0557 /971 1.24-S2 < 1680 Rogers Ave. Matrix: Liquid San Jose, CA 95112 Attention: Fran Thie Work Order #: 9711 G09-05 Reported: Dec 22, 1997 QUALITY CONTROL DATA REPORT Analyte: Methanol Ethanol Iso-Propanol QC Batch#: GC1208971SHSHSA GC1208971SHSHSA GC1208971SHSHSA Analy. Method: 1SHS 1SHS ISHS Prep. Method: HS HS HS Analyst: T.Fran T.Tran T.Tran MS/MSD #: 9711E9402 9711E9402 9711E9402 Sample Conc.: N.D. N.D. N.D. Prepared Date: 12/8/97 12/8/97 12/8/97 Analyzed Date: 12/8/97 12/8/97 12/8/97 Instrument I.D.#: GCvt GCv1 GCv1 Conc. Spiked: 8.0 mg/L 8.0 mg/L 8.0 mg/L Result: 810 8.4 8.2 MS % Recovery: 100 105 103 Dup. Result: 8.4 8.6 8.3 MSD %Recov.: 105 108 104 RPD: 4.9 2.4 1.2 RPD Limit: 0-50 0-50 0-50 LCS #: BLK120897 BLK120897 BLK120897 Prepared Date: 12/8/97 12/8/97 12/8/97 Analyzed Date: 12/8/97 12/8/97 12/8/97 Instrument I.D.#: GCv1 GCvt GCv1 Conc, Spiked: 8.0 mg/L 8.0 mg/L 8.0 mg/1- LCS g/LLCS Result: 7.9 8.2 8.1 LCS % Recov.: 99 103 101 LCS Control Limits 50.150 50-150 50-150 Please Note: The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, 07A NALYTICAL preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix interference,the LCS recovery is to be used to validate the batch.enneranager **MS=Matrix Spike, MSD=MS Duplicate,RPD=relative%Difference 9711G09.BLA <8>