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• �� Sequoia �0 C_hesapeaKe Drive -'edwoou C,t� CA 94063 4151 364 9600 FAX (415) 364 9233 <br /> 100 bales Avenue :�ujce L - lgcora e J ts20 -101 4386 9600 `AX (5 101 686 9689 <br /> A namicai 19 Striker Avenue :�uoze d 5icramento k.-`. `1s934 1161 921 9600 IAX (916)921 0100 <br /> Brown & Caldweli 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 4090649-650 Reported Sep 26, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Total <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EA 8021-1 Ep4 8020 CAA 6010 <br /> Analyst C Lee C Lee C Lee C Lee D Ballard <br /> Concentration <br /> Spiked 10 ug/L 0 ug/L 10 ug/L 30 ug/L 1 0 mg/L <br /> LCS Batch# LCS092294 LCS092294 LCS092294 LCS092294 LCS092194 <br /> Date Prepared 9/22/94 9/22/94 9/22/94 9/22/94 9/21/94 <br /> Date Analyzed 9/22/94 9/22/94 9/22/94 9/22/94 9/21/94 <br /> Instrument I D.# GCHP-2 GCHP 2 GCHP 2 GCHP 2 ICP-1 <br /> LCS % <br /> Recovery 97 97 97 100 101 <br /> Control Limits- 75-125 75-125 75 125 75-125 80-120 <br /> MS/MSD <br /> Batch#- 4090627 4090627 409W27 4090627 4090473 <br /> Date Prepared: 9/22/94 9/22/94 9/22/94 9/22/94 9/21/94 <br /> Date Analyzed 9/22/94 9/22/94 9/22/94 9/22/94 9/22/94 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 ICP-1 <br /> Matrix Spike <br /> Recovery 95 95 96 97 101 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 96 95 96 97 103 <br /> Relative <br /> Difference 1 0 00 00 00 20 <br /> • SEQUOIA ANALYTICAL Please Note <br /> The LGS 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/MSG's are advisory only <br /> Jennie Higgins and are not used to accept or refect batch results <br /> Project Manager <br /> 4090649 BRS <3> <br />