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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364.9600 FAX(415) 364.9233 <br /> 404 N. Wiget Lane Walnut Creek,CA 94598 (510) 988.9600 FAX510 <br /> ( )988-9673 <br /> Analytical 819 S1nkcr Avenue,Suite 8 Sacramento,CA 95834 (916) 911.9600 FAX(916)921-0100 <br /> � I <br /> Terra Vac Corp. <br /> p• Client Project ID: Chevron #9-4054 <br /> 1651 Alvarado Street Matrix: Liquid <br /> San Leandro, CA 94577 <br /> Attention Cliff Garratt OC Sample Group: 7100034-038 Reported: Oct 13, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#: GC100397 GC100397 GC100397 GC100397 <br /> 802004A 802004A 802004A 802004A <br /> Analy. Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> F Prep. Method: EPA 5030 EPA 5030 EPA 5030 EPA 5030 <br /> F <br /> Analyst; 0. Newcomb D.Newcomb D.Newcomb D.Newcomb <br /> MS/MSD #: 7100060 7100060 7100050 7100060 <br /> Sample Conc.: N.D. N,D. N.0. N.D. <br /> Prepared Date: 10/3/97 10/3/97 10/3;97 10/3/97 <br /> Analyzed Date: 10/3/97 10/3/97 10/3'97 10/3/97 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> Conc. Spiked: 20ug/L 20ug/L 20ug;'L 60ug/L <br /> Result: 18 19 19 60 <br /> MS % Recovery: 90 95 95 100 <br /> Dup. Result: 1s 19 19 59 <br /> MSD % Recov.: 90 95 95 98 <br /> RPD: 0.0 0.0 0.0 1.7 <br /> RPD Limit: 0-20 0-20 0-20 0-20 <br /> LCS #: 4LCS100397 4LCS100397 4LC8100397 4LCS100397 <br /> Prepared Date: 10/3/97 10/3/97 10/3;97 10/3/97 <br /> Analyzed Date: 10/3/97 10/3/97 10/3,,97 10/3/97 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> Conc. Spiked: 20ug/L 20ug/L 20ug.'L 60ug/L <br /> LCS Result: 19 21 21 66 <br /> LCS % Recov.: 95 105 105 110 <br /> LCS 70-130 70-130 70-130 70-130 <br /> Control Limits <br /> Please Note. <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 /> g ` tpe 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 /> Melissa A. Brewer "MS=Matrix Spike;MSO=MS Duplicate,RPD Relative%Difference <br /> Client Services Representative <br /> 7100031.TVC <12> <br />