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Y SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> 915) 921 9600 g S X !916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 434-95-5 Lodi <br /> P 0 Box 13449 'fIatrix Air <br /> Sacramento CA 95814 <br /> Attention Mindy Wright OC 5amole Group 4050816-17 Reported May 19 1994 <br /> (QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene Xylenes <br /> Method EPA 8020 EcA 8024 EPA 8020 EPA 8020 <br /> Analyst J Minkel J Minkel J Minkei J Minkel <br /> Concentration <br /> Spiked 10 ug/L 0 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# N/A 14 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 I D # 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 4005804 4006804 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 CC limits for MS/MSDs are advisory only <br /> and are not used to accept or reject batch results <br /> Craig C Le <br /> Project Manager <br /> 4050816 SRS <2> <br />