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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9133 <br /> 404 N W,get Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> VI,r Analytical 319 Striker Avenue Suite 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 Water <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 601-1129 Reported Feb 20, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> TRPH Cadmium Chromium Lead Nickel Zinc <br /> Method EPA 418 1 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst. L Martin CM CM CM CM GM <br /> Concentration <br /> Spiked 4 0 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L 0 50 mg/L <br /> LCS Batch#- LCS021298 LC9020596 LCS020596 LCS020596 LCS020596 LCS020596 <br /> Date Prepared 02/12/96 02/05/96 02/05/96 02/05/96 02/05/96 02/05/96 <br /> Date Analyzed. 02/12/96 02/10/96 02/10/96 02/10/96 02/10/96 02/10/96 <br /> Instrument I D # IFI-1 MTJA-2 MTJA-2 MTJA-2 MTJA-2 MTJA-2 <br /> LCS % <br /> Recovery 108 88 92 87 93 93 <br /> Control Limits- 80-120 80-120 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch # SS021296 6020033 6020033 6020033 6020033 6020033 <br /> Date Prepared 02/12/96 02/05/96 02/05/96 02/05/96 02/05/96 02/05/96 <br /> Date Analyzed 02/12/96 02/10/96 02/10/96 02/10/96 02/10/96 02/10,196 <br /> Instrument LD # IR-1 MTJA-2 MTJA-2 MTJA-2 MTJA-2 MTJA-2 <br /> Matrix Spike <br /> % Recovery: 108 86 90 86 92 91 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery- 105 92 94 92 94 91 <br /> Relative % <br /> Difference: 2 8 67 43 6 7 22 0 0 <br /> Please Note <br /> The LCS is a control sample of known Interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matnx effects,the QC limits for MS/MSD's are advisory only <br /> Ct � and are not used to accept or reject batch results <br /> Jan ad <br /> Project Manager/Sacramento Laboratory <br /> 6011129 SRS <5> <br />