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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> WWWAnalytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916) 911 9600 FAX(916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133 Stockton <br /> 9616 Micron Ave Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Patterson QC Sampie Group 505-1078 Reported Jun 5, 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#. LCS052695 LCS052695 LCS052695 LCS052695 <br /> Date Prepared: 5/26/95 5/26/95 5/26/95 5/26/95 <br /> Date Analyzed: 5/26/95 5/26/95 5/26/95 5/26/95 <br /> Instrument I D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 95 96 97 97 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #: 5051062 5051062 5051062 5051062 <br /> Date Prepared: 5/26/95 5/26/95 5/26/95 5/26/95 <br /> Date Analyzed. 5/26/95 5/26/95 5/26/95 5/26/95 <br /> Instrument I D.#* GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> %Recovery 97 94 97 95 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 96 94 96 94 <br /> Relative% <br /> Difference: 10 00 10 1 1 <br /> .SEQUOIA ANALYTICAL Please Note <br /> 4CThe LCS 1s a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> �.11 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 /> Janet Han and are not used to accept or reject batch results <br /> Project Manager <br /> 5051076 BRS .45> <br />