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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: Surrogate report for 3 samples for Gasoline BTEX analysis . <br /> Method: SW846 8020A Nov 1990 / 8015Mod <br /> Lab Run#: 14013 <br /> Matrix: SOIL <br /> % Recover <br /> Sample# Client Sample ID Surrogate Recovered LimitE <br /> 197512-1 BH-A 8 . 01 TRIFLUOROTOLUENE 72 . 9 53-12 <br /> 197512-1 BH-A 8 . 01 4-BROMOFLUOROBENZENE 61 . 2 58-12 <br /> 197513-1 BH-A 13 . 0 ' TRIFLUOROTOLUENE 78 . 5 53-12 <br /> 197513-1 BH-A 13 . 0 ' 4-BROMOFLUOROBENZENE 64 . 1 58-12 <br /> 197514-1 BH-A 18 . 0 ' TRIFLUOROTOLUENE 73 . 8 53-12 <br /> 197514-1 BH-A 18 . 0 ' 4-BROMOFLUOROBENZENE 63 . 8 58-12 <br /> % Recover <br /> Sample# QC Sample Type Surrogate Recovered Limits <br /> 197901-1 Reagent blank (MDB) TRIFLUOROTOLUENE 91 . 0 53-12 <br /> 197901-1 Reagent blank (MDB) 4-BROMOFLUOROBENZENE 89 . 1 58-1: <br /> 197902-1 Spiked blank (BSP) TRIFLUOROTOLUENE 94 . 6 53-12 <br /> 197902-1 Spiked blank (BSP) 4-BROMOFLUOROBENZENE 82 . 2 58-12 <br /> 197903-1 Spiked blank duplicate (BSD)TRIFLUOROTOLUENE 91 . 4 53-12 <br /> 197903-1 Spiked blank duplicate (BSD)4-BROMOFLUOROBENZENE 79 . 3 58-12 <br /> 197904-1 Matrix spike (MS) TRIFLUOROTOLUENE 370 53-12 <br /> 197904-1 Matrix spike (MS) 4-BROMOFLUOROBENZENE 264 58-12 <br /> 197905-1 Matrix spike duplicate (MSD)TRIFLUOROTOLUENE 629 53-12 <br /> 197905-1 Matrix spike duplicate (MSD)4-BROMOFLUOROBENZENE 223 58-12 <br /> V132 <br /> QCSURR1229 VINCE 31-Jul-98 <br /> 1220 Quarry Lane • Pleasanton, California 94566-4756 <br /> (925) 484-1919 • Facsimile (925) 484-1096 <br /> Forlorml In ffrq-n1N11r,7 <br />