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Sequoia 080 Chesapeake Dnvc Rcdw000 City CA 94063 {3151 364 9600 eAX(415) 364-9233 <br /> 1900 Hates Avenue 5uitc L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 319 Sinker Avenue �uitc 8 Sacramento CA 95834 916] 921 9600 FAX(9 16)921 0100 <br /> Analytical <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 Sample Group 505-107B 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# LC8052695 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 5/25/95 5/26/95 <br /> Date Analyzed: 5/26/95 5/26/95 5/26/95 5/26/95 <br /> Instrument LD #- 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 /> 40TheLCS Is a control sample of known,Interferent free matrix that is analyzed using the same reagents, <br /> -tX Ir <br /> 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 /> Janet flan and are not used to accept or reject batch results <br /> Project Manager <br /> 5051078 BRS <5> <br />