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t J \ Sequoia 680 Chesapeake Drwe Redwood City CA 94063 (4 15) 364 9600 FAX(415) 364 9233 1900 Bates Avenue Suite L Concord CA 94520 51(1) 686 9600 FAX(510) 686 9689 Analytical 319 Striker Avenue quite 8 Sacramento CA 95834 916) 92t 9600 FAX(916) 921 0i00 Brown & Caldwell Client Project 1D Arco 2133-94-5, Stockton P O Box 13449 Matrix Water Sacramento, CA 95813-3449 Attention Mindy Wright OC Sample Group 405-0783 Reported May 27 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 T 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# LCS052594 LCS052594 LCS052594 LCS052594 LCS052594 Date Prepared 5/25/94 5/25/94 5/25/94 5/25/94 5/25/94 Date Analyzed: 5/26/94 5/26/94 5/26/94 5/26/94 5/26/94 Instrument I D # PE 40 PE 40 PE 40 PE 40 PE 40 . LCS % Recovery. 107 104 105 104 108 Control Limrts• 80-120 80-120 80-120 80-120 80-120 MS/MSD Batch#: 4050640 4050M 40SOM 4050640 4050640 Date Prepared: 5/25/94 5/25/94 5/25/94 5/25/94 5/25/94 Date Analyzed: 5/26/94 5/26/94 5/26/94 5/26/94 5/26/94 Instrument 11.13 #. PE 40 PE 40 PE 40 PE 40 PE 40 Matrix Spike %Recovery: 106 106 111 106 107 Matrix Spike Duplicate% Recovery: 112 109 113 108 111 Relative% Difference: 55 2 8 is 19 35 Please Note The LCS is a control sample of known,interferent free matrix that is 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 CA a L r, ' A _ and are not used to accept or reject batch results Craig C Le Project Manager 4050783 BRS <4a