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CHROMALAB, INC. <br /> Environments!Services(SDS) <br /> June 2, 1998 Suabm-ISSian #: 9805422 <br /> ERM-WEST WALNUT CREEK <br /> Atten • James Ackerman <br /> Pro3ect UP-STOCKTON Pro3ect#: 8187-2 5 <br /> Received: May 18 , 1998 <br />' re: Blank spike and duplicate report for Gasoline BTEX analysis <br /> Method. SW846 8020A Nov 1990 / 8015Mod <br /> Matrix. SOIL <br /> Lab Run#: 12999 Analyzed: May 31, 1998 <br />' Spike <br /> Spike Amount Amount Found Spike Recov <br /> BSP Dup BSP Dup SSP Dup Control $ RPD <br /> Anal to m R m R (%)- Limits RPD Lim <br /> GASOLINE 12 5 12 5 11 4 14 2 91 2 114 65-135 22 2 35 <br /> BENZENE 2 50 2 . 50 2 49 2 45 99 6 98 0 77-123 1 . 62 35 <br /> TOLUENE 2 50 2 50 2 . 55 2 . 50 102 100 78-122 1 . 98 35 <br /> ETHYL BENZENE 2 So 2 . 50 2 78 2 73 111 109 70-130 1 82 35 <br /> XYLENES 7 50 7 .50 8 60 8 . 35 115 111 75-125 3 . 54 35 <br /> 1 <br /> 1 <br /> 1 <br /> I <br /> BS Smpt # 188190 LEV2 <br /> BSD SmpL # 188191 1220 Quarry Lane • Pleasanton, California 94566-4756 «BSDu26 MaiS2R,8 <br /> (925) 484-1919 • Facsimile (925) 484-1096 <br /> Federal 10 #68-0140157 <br />