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s Sequoia 60 Chesapeake Nvt Redwood City,CA 94063 (415) 364-600 FAX(413) 364.9233 <br /> 1960 Sates Av nue,Suitt L Concord,CA 94520 (510) 666.9604 FAX(5 0)6669619 <br /> Analytical 319 Striker Avenue,Suite 6 Saersmenw,CA 95634 (916) 921.9600 FAX(9 16)93 too <br /> rAlton Geosc ence M Uent Projea['10: M�o611k04 X43 Y <br /> 30-A Lindbergh Ave. Matrix: Liquid <br /> Livermore, CA 94550 <br /> Attention: Kevin Keenan OC Sample Group: 5010574-85 Reported: Jan 25, 19% <br /> QUALITY CONTROL DATA REPORT <br /> AL E Benzene Toluene Ethyl Xylens: Diesel <br /> Benzene <br /> EPA <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod, <br /> Analyst: A.Tuzon A Tuzon A.Tuzon A-Tuzon KV.S. <br /> MS/MSD <br /> Batch#: 5010655 5010655 5olo655 5010655 BLK011895 <br /> Date Prepared: 1/20/95 1/20/95 1/20/95 1/20/95 1/18/95 <br /> Date Analyzed: 1/20/95 1/20/95 t/20/95 1/20/95 1/20/95 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 HP-38 <br /> Conc. Spiked: 20pg/L 20ua/L 20tus/L 60jug/L 3001rg/L <br /> Matrix Spike <br /> %Recovery: 100 100 105 108 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 105 110 110 115 87 <br /> Relative% <br /> Difference: 4.9 9.5 4.7 6.3 11 <br /> r <br /> LCS Batch#: ILCS011295 iLCS011295 1LCW11295 11-CS011295 BLK011895 <br /> Date Prepared: 1/20/95 1/20/95 1/20/95 1/20/95 1/18/95 <br /> Date Analyzed: 1/20/.95 1/24/95 1/20/95 1/20/95 1/20/95 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 HP-30 <br /> LCS % <br /> Recovery: 97 102 los 110 97 <br /> ecovery <br /> lCaf7tr0! l.Imits: 71-133 72-126 72-130 71-120 28.122 <br /> Please Me: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> BQU ALYTICAL, #1271 preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br /> fortified wlet known quantities of spscMc compounds and subjected to the entire analytical procedure. H <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,,the LCS reacove is to be used to validate the batch, <br /> K net K.F. Lee <br /> Laboratory Director <br /> 5010574.ALT <6> <br />