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u SEQUOIA ANALYTICAL 819 Straker Avenue, Suite 8 • Sacramento, CA 95834 (916) 921-9600 • FAX (916) 921-0100 Brown &Caldwell Client Project 10 Arco 2133-94-5, Stockton P O Box 13449 Matrix Water Sacramento, CA 95813-3449 Attention Mindy Wright QC Sample Group 404-0380 Reported Apr 20, 1994 QUALITY CONTROL DATA REPORT ANALYTE Cadmium Chromium Coeper Lead Nickel Zinc j Method EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 Analyst S Foster S Foster S Foster S Foster S Foster S Foster Concentration Spiked: 1 0 mg/l- 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L 1 0 mg/L LCS Batch#: LCSO41594 LCSO41594 LCSO41594 1-CSO41594 LCSO41594 LCSO41594 Date Prepared. 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 Date Analyzed' 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 Instrument I D # PE 40 PE 40 PE40 PE-Q PE-40 PE 40 LCS Recovery 91 94 97 97 94 94 i Control Limits: 80-120 80-120 80.120 80-120 so-120 80-120 MS/MSD Batch#: 4040297 4040297 4040297 4040297 4040297 4040297 Date Prepared 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 Date Analyzed: 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 4/15/94 Instrument I.D #: PE-40 PE-40 PE-40 PE-40 PE-40 PE-40 Matrix Spike % Recovery: 87 88 95 87 89 89 Matrix Spike Duplicate% Recovery 92 90 98 97 91 95 Relative % Difference 56 22 31 11 2 2 65 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 Cue to matrix effects,the OC limits for MS/MSG's are advisory only LC- and are not used to accept or reject batch results 9 Crai C te Project Manager 4040380 BRS -c4>