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0 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1900 late, Avcnue Suite L Concord CA 94520 f510) 686 9600 FAX (510)686 9689 <br /> Analytical b 19 Striker Avenue Suite 8 Sacramento LA 95834 (916) 921 9600 FAX(916) 921 0{00 <br /> Brown &Caldwell Client Project ID Arco 2133-94-5, Stockton <br /> P O Box 13449 Matrix Water <br /> Sacramento, CA 95813-3449 <br /> Attention Mindy Wright OC Sample Group 405-0783 Reported May 27 1994 <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 ❑ Ballard 0 Ballard D Ballard D Ballard <br /> Concentration <br /> Spiked. 10 ug/L 10 fr9/L 10 u9/L 30 fug/L <br /> LCS Batch#' LCS051894 LC8051894 I-CS051894 LCS051894 <br /> Date Prepared 5/18/94 5/18/94 5/18/94 5/18/94 <br /> Date Analyzed. 5/18/94 5/18/94 5/18/94 5/18/94 <br /> Instrument I.D.#. HP-2 HP-2 HP-2 HP 2 <br /> • LCS % <br /> Recovery: 103 102 102 102 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> r � <br /> MS/MSD <br /> Batch#: 4050731 4050731 4050731 4050731 <br /> Date Prepared: 5/18/94 5/18/94 5/18/94 5/18/94 <br /> Date Analyzed' 5/18/94 5/18/94 5/18/94 5/18/94 <br /> Instrument I.D.#' HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery- 98 98 100 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 110 100 100 103 <br /> Relative % <br /> Difference 12 41 00 60 <br /> 0 SEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known,lnterterent free matrix that 1s analyzed using the same reagents, <br /> G, c.` C. 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/MSD's are advisory only <br /> Craig C L and are not used to accept or reject batch results <br /> Project Manager <br /> 4050783 BRS <3> <br />