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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 FAX (916) 921-0100 <br /> rown & Caldwell Client Project ID Arco 2133-94-5, Stockton <br /> 0 Box 13449 Matrix Water <br /> Sacramento, CA 95813-3449 <br /> Attention Mindy Wright QC Sample Group 404-0380 Reported Apr 20, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. D Ballard D Ballard D Ballard D Ballard <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch#• LCSO41994 LCSO41994 LCSO41994 LCSO41994 <br /> Date Prepared. 4/19/94 4/19/94 4/19/94 4/19/94 <br /> Date Analyzed. 4/19/94 4/19/94 4/19/94 4/19/94 <br /> Instrument I D.#' HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery: ss ss 100 103 <br /> Control Limits: eo-120 80-120 80-120 80.120 <br /> "•• • r,r ..w.NM..:SGS.�Y tiSSw.Yrn dv F4 r <br /> MS/MSD <br /> Batch#: 4040431 4040431 4040431 4040431 <br /> Date Prepared: 4/19/94 4/19/94 4/19/94 4/19/94 <br /> Date Analyzed: 4/19/94 4/19/94 4/19/94 4/19/94 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> %Recovery: 100 100 110 113 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 110 100 110 113 <br /> Relative % <br /> Difference- 95 00 00 00 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS,s a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> &A L preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample hatch results Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> Craig C L e and are not used to adept or reject batch results <br /> Project Manager <br /> 4040=BRS <3> <br />