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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: SOIL <br /> Lab Run#: 14013 Analyzed: July 30 , 1998 <br /> Spike <br /> Spike Amount Amount Found Spike Recov <br /> BSP Dup BSP Dup BSP Dup Control % RP <br /> Analyte (mg/Kg) (mq/Kq) M (o) Limits RPD Li <br /> GASOLINE 0 . 500 0 . 500 0 .448 0 .426 89 . 6 85 . 2 75-125 5 . 03 35 <br /> BENZENE 0 . 100 0 . 100 0 . 104 0 . 0995 104 99 . 5 77-123 4 . 42 35 <br /> TOLUENE 0 . 100 0 . 100 0 . 102 0 . 0981 102 98 . 1 78-122 3 . 90 35 <br /> ETHYL BENZENE 0 . 100 0 . 100 0 . 102 0 . 0994 102 99 . 4 70-130 2 . 58 35 <br /> XYLENES 0 . 300 0 . 300 0 . 308 0 . 298 103 99 . 3 75-125 3 . 66 35 <br /> BS Smp — <br /> i BSD Smpl #: 197903 1220 Quarry Lane • Pleasanton, California 94566-4756 OC_BSD1226 ONCE 16:00:12 <br /> (925) 484-1919 • Facsimile (925) 484-1096 <br /> r:Adoral In ffrQ-nl/101C�7 <br />