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CHROMALAB, INC. <br /> Environmental Services(SDB) <br />' May 28 , 1998 Submsssion #: 9805267 <br />' ERM-WEST WALNUT CREEK <br /> Atten: James Ackerman. <br /> Project. UP-STOCKTON Project#: 8187 25 <br /> Received: May 18, 1998 <br />' re. Matrix Spike report for Gasoline BTEX analysis <br /> Method: SW846 8020A Nov 1990 / 8015Mod <br /> Matrix WATER <br /> Lab Run#. 12882 Instrument: 3400-3 Analyzed: May 22 , 1998 <br /> Spiked <br /> Sample Spike Amt Amt Found Spike Recov % <br /> Amount MS MSD MS MSD MS MSD Control $ RPD <br /> Analyte u L u L (ug/L $ $ Limits RPD Lim <br /> iGASOLINE N.D. 500 500 1870 1840 74 . 0 68 . 0 65-135 8 .45 20 <br /> BENZENE 38 100 100 115 119 77 . 0 81 . 0 65-135 5 . 06 20 <br /> TOLUENE 11 100 100 91 7 95 9 80 7 84 . 9 65-135 5 . 07 20 <br /> ETHYL BENZENE 12 100 100 100 103 88 0 91 0 65-135 3 . 35 20 <br /> XYLENES 180 300 300 402 425 74 0 81 . 7 65-135 9 89 20 <br /> Sample Spiked 186379 <br /> Submission #. 9805267 <br /> Client Sample ID: B-6 <br /> 1 <br /> 1 <br />' MS Smpl # 187139 1220 Quarry Lane « Pleasanton, California 94566-4756 <br /> MSD Smpt # 187140 (925) 484-1919 • Facsimile (925) 484-1096 QCMSPK7229 VINCE 28 May 98 10 3 <br /> Federal ID#68-0140157 <br />