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Ci) Sequoia 680 Chesapeake Dnve Rcdwood Cay CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> Glib Analyteal Bates Avenue Suite L Concord CA 94520 (510) 6869600 FAX(514) 686 9689 <br /> 819 Stnker Avenue Sutic a Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> Brown & Caldwell Client Project 10 Arco 2133-94-5 Stockton <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento, CA 95827 <br /> Attention Mindy Wright OC Sample Gaup 412-0299 Reported Dec 19, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 200 7 <br /> Analyst C Chapman C Chapman C Chapman C Chapman K Barta <br /> Concentration <br /> Spiked t0 ug/L 10 ug/L 10 ug/L 30 ug/L 0 50 mo�C <br /> LCS Batch# LCS121494 LCS121494 LCS121494 LCS 121494 LCS121294 <br /> Date Prepared 12/14/94 12/14/94 12/14/94 12/14/94 12/12/94 <br /> Date Analyzed 12/14/94 12/14/94 12/14/94 12/14/94 12/14/94 <br /> Instrument I D # GCHP 1 GCHP-1 GCHP-1 GCHP-1 P 40 <br />. LCS <br /> Recovery 85 84 83 82 94 <br /> Cort,of Limit- 75-125 75-125 75-125 75-125 80-120 <br /> MS/MSD <br /> Batch # 4120299 4120299 4120299 4120299 4120265 <br /> Date Prepared 12/14/94 12/14/94 12/14/94 12/14/94 12/12/94 <br /> Date Analyzed 12/14/94 12/14/94 12/14/94 12/14/94 12/14/94 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP 1 GCHP-1 P-40 <br /> Matrix Spike <br /> % Recovery 83 82 82 80 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 90 89 89 90 94 <br /> Relative % <br /> Difference 8 1 8 2 8 2 12 21 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known Interferent free matrix that is analyzed using the same reagents <br /> i , u 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 OC limits for MS/MSD s are advisory only <br /> ,Jeri a Higgins and are not used to accept or reject match results <br /> Project Manager <br /> 4120299 ERS 43> <br />