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' / \ Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N W get Line Walnut Creek CA 94598 (510) 983 9600 FAX (M) 988 9673 <br /> Analytical 319 Striker Avenue Suite 8 Sacramento CA 95334 921 9600 FAX(916)921 Ot00 <br /> Brown & Caldwell Client Project ID Arco 02133, Stockton, CA <br /> 9616 Micron Ave , Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Steve Misner QC Sample Group 7030653-72 Reported Apr 1, 1997 <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 B a B B <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS032597 LCS032597 LCS032597 LCS032597 <br /> Date Prepared 03/25/97 03/25/97 03/25/97 03/25/97 <br /> Date Analyzed 03/25/97 03/25/97 03/25/97 03/25/97 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP-2 <br /> LCS % <br /> Recovery 92 92 95 92 <br /> Control Limits 70-130 70-130 70 130 70 130 <br /> MS/MSD <br /> Batch # 7030743 7030743 7030743 7030743 <br /> Date Prepared 03/25/97 03/25/97 03/25/97 03/25/97 <br /> Date Analyzed 03/25/97 03/25/97 03/25/97 03/25/97 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP-2 GCHP 2 <br /> Matrix Spike <br /> % Recovery 81 82 81 79 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 74 76 79 73 <br /> Relative % <br /> Difference 90 75 25 79 <br /> S>=000IA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> I+ � tD 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 OC limits for MS/MSD's are advisory only <br /> Bdana M Frueiano and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory 7030653 SRS <8> <br />