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11 .si <br /> Sequoias o30 ChesaoeaKe -edwooa C,t� CA 94� -I5Y 304 9600 FAX(415) 364 9233 <br /> '900 Barn avenue since L Cuncora CA 94520 <br /> 5101 636 9600 FAX (516921 <br /> ) 9699 <br /> _ na Vtlea1 319 Strike--l,enue �u:lc d �scramenco CA '�i43-i i161 9�I 9600 FAX (915) 92i 0100 <br /> Brown & Caldwell Client Project ID ARCO, 2133 Stockton CA <br /> 9616 Micron Ave Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Wright QC Sample Goup 4100622-623 Reported Oct 27 1994 <br /> QUALITY CONTROL. DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 6020 EPA 200 7 <br /> Analyst C Chapman C Chapman C Chapman C Chapman D Ballard <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 1 0 mg/L <br /> LCS Batch# LCS102594 L-CS102594 LCS102594 LCS102594 LCS102494 <br /> Date Prepared 10/25/94 10/25/94 10/25/94 10/25/94 10/24/94 <br /> Date Analyzed 10/25/94 10/25/94 10/25/94 10/25/94 10/26/94 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 P40 <br /> LCS % <br /> Recovery too 100 100 100 88 <br /> Control Limits 75 125 75-125 75 125 75 125 80-120 <br /> MS/MSD <br /> Batch# 4100732 4100732 4100732 4100732 4100804 <br /> Date Prepared 10/25/94 10/25/94 10/25/94 10/25/94 10/24/94 <br /> Date Analyzed 10/25/94 10/25/94 10/25/94 10/25/94 10/26/94 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP-2 GCHP 2 P40 <br /> Matrix Spike <br /> % Recovery 100 97 100 67 85 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 97 100 60 92 <br /> Relative % <br /> Difference 00 00 Go 11 79 <br /> SEQUOIA ANALYTICAL Please Note <br /> 4 The LCS Is a control sample of known Interferent free matrix that Is analyzed using the same reagents <br /> 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/MSDs are advisory only <br /> .le ie Higgins and are not used to accept or refect batch results <br /> Project Manager ' <br /> 4100622 BRS <3> <br />