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CHROMALAB, INC. <br /> Enwonmentaf Services(SDB) <br /> May 28, 1998 Submission #: 9805267 <br /> ERM-WEST WALNUT CREEK <br /> Atten: James Ackerman <br /> Project UP-STOCKTON Project#: 8187 25 <br /> Received May 18 , 1998 <br /> re: Blank spike and duplicate report for Gasoline BTEX analysis . <br /> Method: SW846 8020A Nov 1990 / 8015Mod <br /> Matrix SOIL <br /> Lab Run# 12855 Analyzed: May 21, 1998 <br /> 1 Spike <br /> Spike Amount Amount Found Spike Recov % <br /> BSP Dup BSP Dup BSP Dup Control $ RPD <br /> Analyte (Ma/M m K $ $ Limits RPD Lim <br /> GASOLINE 0 500 0 500 0 440 0 409 88 . 0 81 8 75-125 7 .30 35 <br /> BENZENE 0 . 100 0 . 100 0 106 0 0837 106 83 7 77-123 23 . 5 35 <br /> TOLUENE 0 100 0 . 100 0 106 0 0965 106 96 5 78-122 9 38 35 <br /> ETHYL BENZENE 0 . 100 0 . 100 0 . 102 0 . 0979 102 97 . 9 70-130 4 . 10 35 <br /> XYLENES 0 . 300 0 . 300 0 . 321 0 . 310 107 103 75-125 3 . 81 35 <br /> 1 <br /> B5 Smpt # 186925 LEV2 <br /> SSD Smpl # 186926 1220 Quarry Large • Pleasanton, California 94566-4756 aawian MMW1243 <br /> (925) 484-1919 • Facsimile (925) 464-1096 <br /> Federal ID #68-0140157 <br />