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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364.9233 <br /> 404 N. Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Iwo- Analytical 819 Stnker Avenue,Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> Blaine Tech Services, Inc. Client Project ID: Chevron 9-0557 % 980211-D1 <br /> 1680 Rogers Ave. Matrix: Liquid <br /> <San Jose, CA 95112 <br /> .Attention: Fran Thie Work Order#: 9802714 -01-04 Reported: Mar 5, 1998'. <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GCO22098802007A GCO22098802007A GCO22098802007A GCO22098802007A GCO22098802007A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> Analyst: S.L. S.L. S.L. S.L. S.L. <br /> MS/MSD #: 98020510 98020510 98020510 98020510 <br /> Sample Conc.: 16 2.4 1.4 6.2 <br /> Prepared Date: 2/21/98 2/21/98 2/21/98 2/21/98 <br /> Analyzed Date: 2/21/98 2/21/98 2/21/98 2/21/98 <br /> Instrument I.D.#: GC7 GC7 GC7 GC7 <br /> Conc. Spiked: 20 pg/L 20 Mg/L 20 frg/L 60 pg/L <br /> Result: 36 23.4 23.7 76.4 <br /> S % Recovery: 100 105 112 117 <br /> Dup. Result: 31.5 20.2 20.5 67.5 <br /> MSD % Recov.: 78 88 96 102 <br /> RPD: 13 15 14 12 <br /> RPD Limit: 0-25 0-25 0-25 0-25 <br /> LCS #: LCS022098 LCS022098 LCS022098 LCS022098 LCS022098 <br /> Prepared Date: 2/20/98 2/20/98 2/20/98 2/20/98 2/20/98 <br /> Analyzed Date: 2/20/98 2/20/98 2/20/98 2/20/98 2/20/98 <br /> Instrument I.D.#: GC7 GC7 GC7 GC7 GC7 <br /> Conc. Spiked: 20pg/L 20pg/L 20ftg/L 60pg/L 500 ug/L <br /> LCS Result: 18 18.1 19 57.6 478 <br /> LCS % Recov.: 90 91 95 96 96 <br /> 60-140 60-140 60-140 60-140 60-140 <br /> LCS 70-130 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note: <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> ,"lap#2142 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 /> Penner <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9802714.BLA <1> <br />