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-5 r <br /> SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (916) 921 9600 FAX (916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 434-95-5 Lodi <br /> P Q Box 13449 Matrix Air <br /> Sacramento CA 95814 <br /> Attention Mindy Wright QC Sample Group 4050816-17 Reported May 19, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene X lenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# N/A N/A N/A N/A <br /> Date Prepared N/A N/A N/A N/A <br /> Date Analyzed N/A N/A N/A N/A <br /> Instrument 10 # N/A N/A N/A N/A <br /> LCS % <br /> Recovery N/A N/A N/A N/A <br /> Control Limits, 71-133 72-128 72-130 71-120 <br /> MS/MSD <br /> Batch#' 4DC6804 4DC6804 4DC6804 4DC6804 <br /> Date Prepared: N/A N/A N/A N/A <br /> Date Analyzed' 5/3/94 5/3/94 5/3/94 5/3/94 <br /> Instrument I D # GCHP-17 GCHP-17 GCHP 17 GCHP-17 <br /> Matrix Spike <br /> % Recovery* 110 110 110 107 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 91 90 90 <br /> Relative% <br /> Difference. 15 19 20 17 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> 11 . C � C, and are not used to accept or reject batch results <br /> Craig C L`ise <br /> Project Manager <br /> 4050816 SRS <2> <br />