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Sequoia <br /> 680 Chesapeake Dnve Redwood City CA 94063 (415) 364-9600 FAX (415) 364 9233 <br /> Analytical 1940 Bates Avenue Suite L Concord CA 94520 {510) 686 9600 FAX (514) 686 9689 <br /> vNe819 Stnker Avenue �)u:te 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133, Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Air <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson QC Sample Goup 5020282-286 Reported Feb 24, 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 2 0 mg/W 2 0 mg/m3 2 0 mg/m3 6 0 mg/m, <br /> LCS Batch#' LCS021095 LCS021095 LCS021095 LCS021095 <br /> Date Prepared: 2/10/95 2/10/95 2/10/95 2/10/95 <br /> Date Analyzed: 2/10/95 2/10/95 2/10/95 2/10/95 <br /> instrument I D.#* GCHP-3B GCHP-3B GCHP-3B GCHP-3B <br />. LCS % <br /> Recovery: 96 97 96 96 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> ,,, .,. 4 � > . .. , . r ... .,,.,..... t ..t ,. 4^^.•c,•,r�,r,,a,r� .,tv,w vv ti.. <br /> MS/MSD <br /> Batch#: SLK021095 SLK021095 BLK021095 BLK021095 <br /> Date Prepared: 2/10/95 2/10/95 2/10/95 2/10/95 <br /> Date Analyzed: 2/10/95 2/10/95 2/10/95 2/10/95 <br /> Instrument I.D.#: GCHP38 GCHP-3B GCHP-3B GCHP-3B <br /> Matrix Spike <br /> Recovery: 96 97 96 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 94 94 94 94 <br /> Relative% <br /> Difference: 21 31 2.1 21 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS Is a control sample of known,interferent free matrix that 19 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 GC limits for MS/MSD's are advisory only <br /> Jen le Higgins and are not used to accept or reject batch resuits <br /> Project Manager <br /> 5020MBRS <5> <br /> rtiti <br />