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CHROMALAB, INC. <br /> ErntronmentW Services(SOB) <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#: 18259 Analyzed: April 7, 1999 <br /> ' Spike <br /> Spike Amount Amount Found Spike Recov % <br /> BSP Dup BSP Dup BSP Dup Control % RPD <br /> ' Analyte (ucr/L) (uQ/L) M (%) Limits RPD Lim <br /> BENZENE - 50 .0 50 . 0 48 . 0 49 .3 96 . 0 98 . 6 69-129 2 . 67 20 <br /> CHLOROBENZENE 50 . 0 50 . 0 54 .4 54 .5 109 109 61-121 0 20 <br /> ' 1,1-DICHLOROETHENE 50 . 0 50 . 0 43 .4 42 .7 86 . 8 85 . 5 65-125 1 . 51 20 <br /> TOLUENE 50 . 0 50 . 0 45 . 3 46 .3 90 . 6 92 . 6 70-130 2 . 18 20 <br /> TRICHLOROETHENE 50 . 0 50 . 0 45 . 5 47 .4 91. 0 94 . 8 74-134 4 . 09 20 <br /> 1 <br /> ' BS Snpl #: 236023 <br /> BSD Snpl 9: 236024 1220 Quarry Lane • Pleasanton, Cafrfornia 94566-4756 a� <br /> (925)484-1919 • Facsimile (925) 484-1096 <br /> Federal ID#68-0140157 <br />