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- ' Sequoia o80 Chesapeake Drive Redwood City CA 94063 '415) 364 9600 FAX(415) 3454 9233 <br /> 404 N W get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 419 Striker Avenue Suite 8 Sacramento CA 95834 19t6) 921 9600 FAX (916)921 0100 <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 OC Sample Group 507-0342 Reported Jul 25, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel Zinc <br /> Method: EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst: K Barta K Barta K Barta K Barta K Barta <br /> Concentration <br /> Spiked 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L. 0 50 mg/L <br /> LCS Batch#- LCS071895 LCS071895 LCS071895 LCS071895 LCS071895 <br /> Date Prepared 7/18/95 7/18/95 7/18/95 7/18/95 7/18/95 <br /> Date Analyzed: 7/24/95 7/24/95 7/24/95 7/24/95 7/24/95 <br /> Instrument l D.#: P-40 P-40 P-40 P-40 P-40 <br /> LCS % <br /> Recovery- 103 94 100 101 106 <br /> Controls Limits: 80-120 BD-120 8O-120 80.120 80-120 <br /> MS/MSD <br /> Batch#: 5070593 5070593 5070593 5070593 5070593 <br /> Date Prepared: 7/18/95 7/18/95 7/18/95 7/18/95 7/18/95 <br /> Date Analyzed: 7/24/95 7/24/95 7/24/95 7/24/95 7/24/95 <br /> Instrument I.D.#: P-40 P-40 P-40 P-40 P-40 <br /> Matrix Spike <br /> %Recovery- 98 90 98 96 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 96 88 96 94 99 <br /> Relative% <br /> Difference- 20 22 20 21 40 <br /> AMSEQUOIA ANALYTICAL Please Note <br /> The LCS 1s a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> 7� vaisdationot sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Janet arian and are not used to accept or reject batch results <br /> Project Manager <br /> 5070342.BRS -c5> <br />