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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> (915) 921 9600 SAX (916) 921 0100 <br /> Brown 6 Caldwell Client Project ID Arco 434-94-5 1_0[11 <br /> P 0 Box 13449 Matrix Air <br /> Sacramento CA 95813-3449 <br /> -attention Mindy Wright CC Sample Group 4040378-379 Reported Apr 14 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Chiaravallou Chiaravalloti Chiaravaltoti Chiaravailoo <br /> Concentration <br /> Spiked 2 0 mg/m, 2 0 mg/m, 2 0 mg/m, 6 0 mg/m; <br /> LCS Batch# BLK041394 BLK041394 ELK041394 BLK041394 <br /> Date Prepared -;/13/94 4113/94 4J 13/94 4 13/94 <br /> Date Analyzed 4/13/94 4/13/94 4/13/94 4/13/94 <br /> Instrument I D # HP 2 HP 2 HP-2 HP 2 <br /> • LCS % <br /> Recovery 90 90 90 88 <br /> Control Limits 75-125 75 125 75-125 75 125 <br /> MS/MSD <br /> Batch# 8LK041394 BLK041394 BLK041394 SLK041394 <br /> Date Prepared 4/13/94 4/13/94 4/13/94 4/13/94 <br /> Date Analyzed 4/13/94 4/13/94 4/13/94 4/13/94 <br /> Instrument I ❑ # HP 2 HP 2 HP 2 HP-2 <br /> Matrix Spike <br /> % Recovery 90 90 90 88 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 90 95 92 <br /> Relative% <br /> Difference 54 00 54 44 <br /> . SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> C �_� preparation and analytical methods employed for the samples The LCS%recovery data is used for Ca validation of sample batch results Due to matrix effects the CSC limits for MS/MSD s are advisory only <br /> Craig Cte and are not used to accept or reject batch results <br /> Project Manager <br /> 4040378 SRS <2n <br />