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CHROMALAB, INC. <br /> Environmental Services(SDB) <br /> July 31, 1998 Submission #: 9807406 <br /> AQUA SCIENCE ENGINEERS INC <br /> Atten: Robert Kitay <br /> Project: HANSON PROPERTY Project#: 2857 <br /> Received: July 28, 1998 <br /> re: Blank spike and duplicate report for Gasoline BTEX analysis . <br /> Method: SW846 8020A Nov 1990 / 8015Mod <br /> Matrix: WATER <br /> Lab Run#: 14025 Analyzed: July 30, 1998 <br /> Spike <br /> Spike Amount Amount Found Spike Recov % <br /> BSP Dup BSP Dup BSP Dup Control % RP: <br /> Analyte (ug/L) (uq/L) M (%) Limits RPD Li <br /> GASOLINE 500 500 596 572 119 114 75-125 4 . 29 20 <br /> BENZENE 100 100 92 . 8 98 . 2 92 . 8 98 . 2 77-123 5 . 65 20 <br /> TOLUENE 100 100 94 . 2 99 . 8 94 . 2 99 . 8 78-122 5 . 77 20 <br /> ETHYL BENZENE 100 100 95 . 2 96 . 6 95 . 2 96 . 6 70-130 1 .46 20 <br /> XYLENES 300 300 292 300 97 .3 100 75-125 2 . 74 20 <br /> 1 <br /> BS Smpl #: 198130 <br /> BSD Smpt #: 198131 1220 Quarry Lane • Pleasanton, California 94566-4756 GC_BW1226 %ANCE16:00:12 <br /> (925) 484-1919 • Facsimile (925) 484-1096 <br /> Fariarnl In itrA-nido1F7 <br />