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CHROMALAB, INC. <br /> Environmental Services(SDB) <br /> ' April 7, 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: SOIL <br /> Lab Run#: 18194 Analyzed: April 5, 1999 <br /> ' Spike <br /> Spike Amount Amount Found Spike Recov % <br /> BSP Dup BSP Dup BSP Dup Control % RPD <br /> ' Analyte (uQ/Kcr) (ua/Kcr) M (%) Limits RPD Liu <br /> BENZENE 100 100 93 .7 96 . 8 93 .7 96 . 8 69-129 3 .25 20 <br /> CHLOROBENZENE 100 100 96 . 6 98 . 2 96 . 6 98 .2 61-121 1. 64 20 <br /> 1,1-DICHLOROETHENE 100 - 100 86 . 8 87 . 9 86 . 8 87 . 9 65-125 1.26 20 <br /> TOLUENE 100 100 97 . 3 102 97. 3 102 70-130 4 . 72 20 <br /> TRICHLOROETHENE 100 100 93 . 3 96 . 2 93 .3 96 . 2 74-134 3 . 06 20 <br /> 1 <br /> BS Swl *2 235434 <br /> BSD SWL k: 235435 1220 Quarry Lane • Pleasanton, CalHornia 94566-4756 <br /> (925) 484-1919 • Facsimile (925) 484-1096 <br /> Federal ID#68-0140157 <br />