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I <br /> i <br /> Sequoia 680 Chesapeake Drive Redwood City.CA 94063 (415) 364.9600 F <br /> 404 N. Wt et Lane FAX(415}364.9233 <br /> Analytical B Walnut Crock,CA 94598 (St0) 988.9600 FAX(510)988.9673 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 <br /> (916) 921.9600 FAX(9 16)92 t•0100 <br /> Terra Vac Corp. Client Project lD; Chevron #9-41354 <br /> 1651 Alvarado Street Matrix: Vapor <br /> I San Leandro, CA 94577 <br /> Attention Cliff Garratt OC Sample Group: 71 0003 1-033 <br /> . Reported., Oct 13, 1997.. <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene <br /> Ethyl Xylenes <br /> Benzene <br /> OC Batch#: GC1oo297 GC100297 GC100297 GC100297 <br /> 802009A 802009A 802009A 802009A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> na yst: K. Nill K. MR K. Nill K.Nill <br /> MS/MSD #: BLK100297 SLK100297 BLK10C297 BLK100297 <br /> Sample Conc.: N,D• N.D. N.D. N.O. <br /> Prepared bate: 10/2/97 10/2/97 10/2/97 10/2/97 <br /> Analyzed Date: 10/2/97 10/2/97 10/2/97 10/2/97 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 <br /> Conc. Spiked: 2.0 us/L 2.0ug/L 2.0pg/L 6.0ug/L <br /> Result: 1.9 2.1 2.0 6.4 <br /> MS % Recovery: 95 105 100 107 <br /> Dup. Result: 1.8 2.0 1.9 5.9 <br /> MSD % Recov.: 90 100 95 96 <br /> RPD: 5.4 4.9 5.1 8.1 <br /> RPD Limit: 0-20 0-20 0.20 0-20 <br /> 01 <br /> LCS #: <br /> Prepared Date: _ <br /> Analyzed Date: - <br /> Instrument I.D.#: <br /> Conc. Spiked: <br /> LCS Result: <br /> LCS % Recov.: <br /> i <br /> LCS 70.130 70-130 70-130 70.130 <br /> Control Limits <br /> Please Now <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL, #1271 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 /> Q the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Nin erference,the LCS recoveis to be used to validate the batch, <br /> Melissa A. Brewer MS=Matrix Spike, MSD=MS Duplicate,RPD=Refative%Difference <br /> Client Services Representative <br /> 7100031.TVC <11> <br />