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c" Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 N&V Anaiytlea 1900 Bates Avenue Suite L Concoru C- Q4520 {510) 686 9600 FAX (510) 686 9689 $t9 StnKcr Avenue Suite 8 Sacramento C4 95834 {916) 921 9600 FAX (916) 921 0100 r"� Brown & Caldwell Client Pro) ect ID Arco 2133-94-5 Stock-ton 9616 Micron Avenue Suite 600 Matrix Water Sacramento, CA 95827 Attention Mindy Wright CC 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 LCS062794 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-4o LCS % Recovery- 93 86 95 93 99 Control Limits- 80-120 80-120 90-1120 90-120 80.120 MS/MSD Batch #: 4060743 4060743 4060743 4060743 4060743 Date Prepared- 6/27/94 6/27/84 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 i Matnx Spike I ' % Recovery 1100 92 92 97 89 Matrix Spike Duplicate% Recovery 94 87 88 89 86 Relative % Difference 62 5 6 44 86 34 s Please Note The LCS 1s a control sample of known interferent tree 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 16�� validation of sample batch results Due to matrix effects the CC limits for MS/MSDs are advisory only G� �� C / .__! and are not used to accept or reject batch results Craig C Lee Project Manager 4060676 BRS [4> }