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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 7 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-94-2 <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner OC Sample Goup 5010216-218 Reported Jan 19, 1995 <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 C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS011395 LC3011395 LCS011395 LCS011395 <br /> Date Prepared 1/13/95 1/13/95 1/13/95 1/13/95 <br /> Date Analyzed 1/13/95 1/13/95 1/13/95 1/13/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery ss 95 95 95 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch # 5010198 5010198 5010198 5010198 <br /> Date Prepared: 1/13/95 1/13/95 1/13/95 1/13/95 <br /> Date Analyzed 1/13/95 1/13/95 1/13/95 1/13/95 <br /> Instrument I D #: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 98 97 98 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 94 92 95 94 <br /> Relative% <br /> Difference 42 53 31 31 <br /> SEQUOIA ANALYTICAL Please Note <br /> k11 <br /> LCS is a control sample of known,interferent Ire"matrix that is analyzed using the same reagents, <br /> JZ w.w1. 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 OC limits for MS/MSD's are advisory only <br /> .lennie Higgins and are not used to accept or reject batch results <br /> Project Manager <br /> 5010216 BSS <2> <br />