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CHROMALAB, INC. <br /> Environmental Services(SDB) —— <br /> April 2 , 1998 Submission # 9803309 <br /> AQUA SCIENCE ENGINEERS INC <br /> Atten Charlie Rous <br /> Project UNOCAL Project# - 3254 <br /> Received March 20 , 1998 <br /> 1re Surrogate report for 4 samples for Gasoline BTEX analysis <br /> Method SW846 8020A Nov 1990 / 8015Mod <br /> Lab Run# 11922 <br /> 1 Matrix WATER <br /> Recover <br /> Sample# Client Sample ID Surrogate Recovered Limits <br /> 176534-1 BH--C TRIFLUOROTOLUENE 77 8 65-13 <br /> 176534-1 BH-C 4-BROMOFLUOROBENZENE 99 1 65-13 <br /> 176535-1 BH-D TRIFLUOROTOLUENE 92 1 65-13 <br /> 176535-1 BH-D 4-BROMOFLUOROBENZENE 112 65-13 <br /> 176536-1 BH-E TRIFLUOROTOLUENE 74 9 65-13 <br /> 176536-1 BH-E 4-BROMOFLUOROBENZENE 98 8 65-13 <br /> 176537-1 BH-F TRIFLUOROTOLUENE 75 0 65-13 <br /> 176537-1 BH-F 4-BROMOFLUOROBENZENE 99 8 65-13 <br /> Recover <br /> Sample# QC Sample Type Surrogate _ Recovered Limits <br /> I 178150-1 Reagent blank (MDB) TRIFLUOROTOLUENE 74 0 65-13 <br /> 178150-1 Reagent blank (MDB) 4-BROMOFLUOROBENZENE 107 65-13 <br /> 178151-1 Spiked blank (BSP) TRIFLUOROTOLUENE 83 5 65-13 <br /> 178251-1 Spiked blank (BSP) 4-BROMOFLUOROBENZENE 110 65-13 <br /> 178153-1 Spiked blank duplicate (BSD)TRIFLUOROTOLUENE 75 6 65-13 <br /> 178153-1 Spiked blank duplicate (BSD)4-BROMOFLUOROBENZENE 135 65-13 <br /> V132 <br /> 0CSURR1229 VINCE 02 Apr 98 l <br /> I� <br /> 1220 Quarry Lane• Pleasanton, California 94566-4756 <br /> (510) 484-1919• Facsimile (510) 484-1096 <br /> Federal ID #68-0140157 <br />