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CHROMALAB, INC. <br /> Environmental Services(SDB) <br /> April 9, 1999 Submission #: 9904031 <br /> ' SECOR CONCORD <br /> Atten: TOM CROSBY <br /> ' Project: LYON INVESTMENTS Project#: 70139-004-02 <br /> Received: April 1, 1999 <br /> ' re: Blank spike and duplicate report for Volatile Organics by GC/MS analysi <br /> Method: SW846 Method 8260A Sept 1994 <br /> ' Matrix: WATER <br /> Lab Run#: 18250 Analyzed: April 6, 1999 <br /> Spike <br /> Spike Amount Amount Found Spike Recov o <br /> BSP Dup BSP Dup BSP Dup Control % RPD <br /> Analyte (uq/L) (uq/L) M (a) Limits RPD Lim <br /> BENZENE 50 . 0 50 . 0 49 . 7 49 . 6 99 .5 99 .2 69-129 0 .30 20 <br /> CHWROBErrzENE 50 . 0 50 .0 57.2 57 .4 114 115 61-121 0 . 87 20 <br /> 1,1-DICHLOROETHENE 50 . 0 50 . 0 46 .2 49 .3 92 .5 98 .5 65-125 6 .28 20 <br /> TOLUENE 50 . 0 50 . 0 50 .4 48 . 7 101 97.4 70-130 3 . 63 20 <br /> TRICHLOROETHENE 50 . 0 50 . 0 46 . 0 46 . 9 92 . 1 93 . 7 74-134 1. 72 20 <br /> 1 <br /> 1 <br /> 1 <br /> 8S SWt #: 235888 <br /> 'i eso shpt #: 235889 1220 Quarry Lane • Pleasanton, CalHornia 94566-4756 <br /> (925) 484-1919 • Facsimile (925)484-1096 <br /> Federal ID#68-0140157 <br />