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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> G) 404 N- Wig"Lane Walnut Creek,CA 94598 (510) 988.9600 FAX(510)488.9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921.9600 FAX{916)921-0100 <br /> 0 <br /> Blaine Tech Services, inc. Client Project ID: Chevron 9-0557 / 980211-D 1 <br /> 1680 Rogers Ave. Matrix: Liquid <br /> .San Jose, CA 95112 <br /> Attention: Fran Thie Work Order#: 9802714-09-10 Reported: Mar 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes Gas <br /> Benzene <br /> QC Batch#: GCO22298802007A GCO22298802007A GCO22298802007A GCO22298802007A GCO22298802007A <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: 2/22/98 2/22/98 2/22/98 2/22/98 <br /> Analyzed Date: 2/22/98 2/22/98 2/22/98 2/22/98 <br /> Instrument I.D.#: GC7 GC7 GC7 GC7 <br /> Conc. Spiked: 20ug/L P-0ug/L 20ug/L 601ug/L <br /> Result: 36 23.4 23.7 76.4 <br /> MS % Recovery: 100 106 112 117 <br /> Dup. Result: 31.5 20.2 20.5 67.5 <br /> MSD % Recov.: 78 89 96 102 <br /> RPD: 13.3 14.7 14.5 12.4 <br /> RPD Limit: 0-25 0-25 0-25 0-25 <br /> LCS #: LCS022298 LCS022298 LCS022298 LCS022298 LCS022298 <br /> Prepared Date: 2/22/98 2/22/98 2/22/98 2/22/98 2/22/98 <br /> Analyzed Date: 2/22/98 2/22/98 2/22/98 2/22/98 2/22/98 <br /> Instrument I.D.#: GC7 GC7 GC7 GC7 Gc7 <br /> Conc. Spiked: 20 ug/L 20 ug/L 20 ug/L 60 ug/L 500 ug/L <br /> LCS Result: 20.2 20.2 19.5 63.6 489 <br /> LCS % Recov.: 101 101 98 106 98 <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 /> �ap#21 2 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 /> enner <br /> reject Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9802714.BLA <3> <br />