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Y <br /> Sequoia 30 Chesaoeake Drive `edwoou l itv c-A 94063 s15) 364 9600 FAX (4151 364 9233 <br /> '00 Bates Avenue Julte L ncaru Ut 94520 5t0) 686 9600 FAX (510) 686 9689 <br /> Analvtleal 19`,taker Avenue quite 8 �acramentn 9934 1,161 921 9600 FAX (9161 921 0100 <br /> Brown & . <br /> Caldwell Client Project 1D Arco 2133-94-5 Stockton <br /> P O Box 13449 1Hatrix Water <br /> Sacramento CA 95813-3449 <br /> Attention Mlndv Wright OC Samde Group 405-0783 Reported May 27 1994 <br /> DUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst- D Ballard D Batlard D Ballard D Ballard <br /> Concentration <br /> Spiked: 10 ug/L 10 u9/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS051894 LCS051894 LCS051894 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 /> MS/MSD <br /> Batch#: 4050731 4050791 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 96 100 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 110 100 100 103 <br /> Relative % <br /> Difference: 12 41 00 60 <br /> SEQUOIA ANALYTICAL Please dote <br /> The LCS 1s a control sample of known,interferent free matnx that 1s analyzed using the game reagents, <br /> (. A C.., C _ preparation and analytical methods employed for the samples The LCS%recovery date Is used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Crab C L and are not used to accept or reject batch results <br /> Project Manager <br /> 4050=BRS a3> <br />