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Sequoia 680 Chesapeake [pnvc Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1900 Batts Avenue Susie L Concord CA 94520 (5t0) 686 9600 FAX(510)686%89 <br /> X1,7 Analytical 319 Straker Avenue Susie 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br />. Brown & Caldwell Client Project iD Arco 2133-94-5, Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Wright QC Sample Goup 411-0186 Reported Nov 17, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 200 7 <br /> Analyst C Lee C Lee C Lee C Lee D Ballard <br /> Concentration <br /> Spliced 10 ug/L 10 ug/L 10 ug/L 30 ug/L 1 0 my/L <br /> LCS Batch# LCS110894 LCS110894 LCS110894 LCS110894 LCS111494 <br /> Date Prepared 11/8/94 11/8/94 11/8/94 11/8/94 11/14/94 <br /> Date Analyzed 11/8/94 11/8/94 11/8/94 11/11/94 11/15/94 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP 2 GCHP-2 P40 <br />. LCS % <br /> Recovery 100 100 100 100 91 <br /> Control L1m�ts 75-125 75-125 75-125 75-125 eO-120 <br /> MS/MSD <br /> Batch # 4110179 4110179 4110179 4110179 4110168 <br /> Date Prepared 11/8/94 11/8/94 11/8/94 11/8/94 11/14/94 <br /> Date Analyzed 11/8/94 11/8/94 11/8/94 11/8/94 11/15/94 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP 2 Poo <br /> Matrix Spike <br /> % Recovery 98 99 98 100 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 98 98 97 97 91 <br /> Relative% <br /> Difference. 0 0 1 0 1 0 3 0 1 1 <br /> SEQUOIA ANALYTICAL Please Note <br /> . The LCS Is a control sample of known,interferent free matrix that 1s analyzed using the same reagents <br /> preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects the QC limits for MS/MSD s are advisory only <br /> Je Higgins and are not used to accept or reject batch results <br /> Project Manager <br /> 4110186 SRS <3> <br />