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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 Analytical 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 819 Straker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 town & Caldwell Client Project ID Arco 2133-94-5, Stockton 9616 Micron Avenue, Suite 600 Matrix Water Sacramento, CA 95827 Attention Mindy Wright QC Sample Group 406-0676 Reported Jun 29, 1994 QUALITY CONTROL DATA REPORT ANALYTE Cadmium Chromium Lead Nickel Zinc Method EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 Analyst D Ballard D Ballard D Ballard D Ballard D Ballard Concentration Spiked 1 0 mg/L 1 0 mg/L. 1 0 mg/L 1 0 mg/L 1 0 mg/L LCS Batch# LCS062794 LCS062794 LCS062794 LCS062794 LCS052794 Date Prepared 6/27/94 6/27/94 6/27/94 6/27/94 6/27/94 Date Analyzed 6/28/94 6/28/94 6/28/94 6/28/94 6/28/94 Instrument I D.# PE-40 PE 40 PE-40 PE-40 PE-40 LCS % Recovery 93 86 95 93 99 Control Limits 80-120 80-120 80-120 80-120 80-120 MS/MSD Batch # 4060743 4060743 4060743 4060743 4060743 Date Prepared 6/27/94 6/27/94 6/27/94 6/27/94 6/27/94 Date Analyzed 6/28/94 6/28/94 6/28/94 6/28/94 6/28/94 Instrument 1 D # PE-40 PE-40 PE-40 PE-40 PE-40 Matrix Spike % Recovery 100 92 92 97 89 Matrix Spike Duplicate % Recovery 94 87 88 89 86 Relative % Difference 62 56 44 8 6 34 Please Note The LCS 1s a control sample of known interferent free matrix that 1s analyzed using the same reagents, SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data is used for validation of sample batch results Due to matrix effects the QC limits for MS/MSD s are advisory only and are not used to accept or reject batch results Craig C Lee Project Manager 4060676 6 RS <4>