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CHRQMALAB, INC. <br /> Environmenial Services(SDB) - — <br /> April 2 , 1998 Submission # 9803309 <br /> ' AQUA SCIENCE ENGINEERS INC <br /> Atten Charlie Rous <br /> Project UNOCAL Project#. 3254 <br /> Receaved March 20, 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# 11921 Analyzed March 31, 1998 <br /> Spike <br /> Spike Amount Amount Found Spike Recov % <br /> BSP Dup BSP Dup BSP Dup Control % RP <br /> Analyte (MCT/Kg) (mgjKg) M (o) Limits RPD L1 <br /> 1 GASOLINE 12 5 12 5 13 6 12 6 109 101 65-135 7 62 35 <br /> BENZENE 2 50 2 50 2 21 2 31 88 4 92 4 77-123 4 . 42 35 <br /> TOLUENE 2 50 2 50 2 38 2 47 95 2 98 8 76-122 3 . 71 35 <br /> 10 ETHYL BENZENE 2 50 2 50 2 54 2 64 102 106 70-130 3 85 35 <br /> XYLENES 7 50 7 50 7 19 7 34 95 9 97 9 75-125 2 06 35 <br /> 1 <br /> I <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> ss smpl # 178147 1220 Quarry Lane • Pleasanton, California 94566-4756 <br /> ssn smpi # 178148 (510) 484-1919• Facsimile (510) 484-1096 OC EW1226 NWE 160112 <br /> Federal ID ##68-0140157 <br />