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Sequoia 630 Chesapeake Drive Redwood C,cv CA 94063 415) 364 9600 FAX (415) 364 9233 <br /> Analvtieal 1900 Baces Avenue Sucre L Concord CA 94520 510) 686 9600 FAX (510)686 9689 <br /> 319 Sinker Avenue Su=re 8 Sacramcnco Ca 95834 916) 921 9600 FAX (916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-94-4A, Stockton CA <br /> 9616 Micron Ave , Suite 600 Matrix Soil <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 408-0886 Reported Aug 30 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel Zinc <br /> Method EPA 6010 EPA 6010 EPA 6010 EPA 6010 EPA 6010 <br /> Analyst K Anderson K Anderson K Anderson K Anderson K Anderson <br /> Concentration <br /> Spiked 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L <br /> LCS Batch# BLK082294 BLK082294 BLK082294 BLK082294 BLK082294 <br /> Date Prepared 8/25/94 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Date Analyzed 8/25/94 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Instrument I D # Liberty 100 Liberty 100 Liberty 100 Liberty 100 Liberty 100 <br /> LCS % <br /> Recovery 110 98 110 96 112 <br /> Control Limits 75 125 75 125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# 4081322 4081322 4081322 4081322 4081322 <br /> Date Prepared 8/25/94 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Date Analyzed 8/25/94 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Instrument I D # Liberty 100 Liberty 100 Liberty 100 Liberty 100 Liberty 100 <br /> Matrix Spike <br /> % Recovery 108 103 106 102 102 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110 106 110 109 103 <br /> Relative % <br /> Difference 18 29 3 7 66 098 <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 matrix effects the QC limits for MS/MSD s are advisory only <br /> I and are not used to acce t or re ect batch results <br /> Jennie Higgins <br /> Project Manager <br /> 4080886 BRS <4> <br />