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` 680 Chesapeake Drive Redwood city.CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> Sequoia <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (925)988-9640 FAX(9251 988-9673 <br /> Analytical 819 Striker Avenue.Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)9Z1-0100 <br /> 1455 McDowell Blvd- North.Ste D Petaluma,CA 94954 (707) 7c)2-1865 FAX(707}792-0342 <br /> • <br /> Blaine Tech Services, Inc. Client Project ID: Chevron 9-0557/ 980609-J2 <br /> 1680 Rogers Ave. Matrix: Liquid <br /> San Jose, CA 95112 <br /> Attention: Fran Thie QC Sample Group: 9806642-01-08 Reported: <br /> DUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: N.Zahedi N.Zahedi N.Zahedi N.Zahedi <br /> MS/MSD <br /> Batch#: 8060272 8060272 8060272 8060272 <br /> Date Prepared: 6/16/98 6/16/98 6/16/98 6/16/98 <br /> Date Analyzed: 6/16/98 6/16/98 6/16/98 6/16/98 <br /> Instrument I.D.#: HPI HP1 HP1 HP1 <br /> Conc. Spiked: 20yg/L 20vg/L 20ug/L 60yg/L <br /> Matrix Spike <br /> % Recovery: 93 95 92 91 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 96 97 95 95 <br /> Relative % <br /> Difference: 3.2 2.0 3.2 4.3 <br /> LCS Batch#: LCS061698 LCS061698 LCS061698 LCS061698 <br /> Date Prepared: 6/16/98 6/16/98 6/16/98 6/16/98 <br /> Date Analyzed: 6/16/98 6/16/98 6/16/98 6/16/988 <br /> Instrument I.D.#: HP1 HP1 HP1 HP1 <br /> LCS % <br /> Recovery: 95 95 93 95 <br /> Recovery <br /> Control Limits: 60-140 60-140 60-140 60-140 <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 /> Elap #2000 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 /> 7oct <br /> 0 <br /> nager 9806642.BLA <2> <br />