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CHROMALAB, INC. <br /> S7`-Environmental Services(SDB) <br /> 1 April 2, 1998 Submission # 9803309 <br /> AQUA SCIENCE ENGINEERS INC <br /> Atten. Charlie Rous <br /> ' Project UNOCAL Pro3 ect#: 3254 <br /> Received March 20, 1998 <br /> re- Surrogate report for 1 sample for Gasoline BTEX analysis <br /> Method SW846 8020A Nov 1990 / 8015Mod <br /> Lab Run# 11921. <br /> Matrix SOIL <br /> Recover <br /> Sample# Client Sample ID Surrogate _ Recovered Limits <br /> 176544-1 B14-E@6 .51 TRIFLUOROTOLUENE 1.240 65--13 <br /> 176544-1 BH-E@6 5 ' 4-BROMOFLUOROBENZENE 2140 65-13 <br /> Recover <br /> Sample# QC Sample Type Surrogate Recovered Limits <br /> 178146-1 Reagent blank (NIDB) TRIFLUOROTOLUENE 79 2 65-13 <br /> 178146-1 Reagent blank (MDB) 4-BROMOFLUOROBENZENE 1.1.8 65--13 <br /> 1 178147-1 Spiked blank (BSP) TRIFLUOROTOLUENE 80 8 65-13 <br /> 1781.47-1 Spiked blank (BSP) 4-BROMOFLUOROBENZENE 110 65-13 <br /> 178148-1 Spiked blank duplicate (BSD)TRIFLUOROTOLUENE 92 4 65-13 <br /> 178148-1 Spiked blank duplicate (BSD)4-BROMOFLUOROBENZENE 100 65-13 <br /> V135 <br /> QCSURR1229 VINCE 02 Aps 98 1 <br /> 1220 Quarry Lane• Pleasanton, California 94566-4756 <br /> (510) 484-1919• Facsimile (510) 484-1096 <br /> Federal ID #68-0140157 <br />