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1' ti r SEQUOIA ANALYTICAL E 819 Striker Avenue Suite 8 • Sacramento CA 95834 (916) 921 9600 • FAX (916) 921 0100 Brown tip Caldwell Client Project ID Arco 2133-93-5 Stockton P O Box 13449 Matrix `Nater Sacramento CA 95813-3449 Attention Mindy Wright OC Sample Group 312-0316 Reported Dec 16 1993 QUALITY CONTROL DATA REPORT ANALYTE Cadmium Chromium Copper Lead Nickel Zinc 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 2 0 mg/L 2 0 mg/L 2 0 mg/L 2 0 mg/L 2 0 mg/L 2 0 mg/L LCS Batch#• LCS121393 LCS121393 LCS121393 LCS121393 LCS121393 LCS121393 Date Prepared 12/13/93 12/13/93 12/13/93 12/13/93 12/13/93 12/13/93 Date Analyzed 12/14/93 12/14/93 12/14/93 12/14/93 12/14/93 12/14/93 Instrument I D.# PE-40 PE-40 PE-40 PE-40 PE-40 PE-40 LCS Recovery- 98 99 99 98 99 99 Control Limlts: 80-120 80-120 80-120 80-120 80120 80-120 MS/MSD Batch #' 3120351 3120351 3120351 3120351 3120351 3120351 Date Prepared: 12/13/93 12/13/93 12/13/93 12/13/93 12/13/93 12/13/93 Date Analyzed. 12/14/93 12/14/93 12/14/93 12/14/93 12/14/93 12/14/93 Instrument I D.#: PE-40 PE-40 PE-40 PE-40 PE-40 PE-40 Matrix Spike %Recovery: 76 76 81 90 82 84 Matrix Spike Duplicate% Recovery: 81 81 88 91 85 84 Relative% Difference: 64 64 83 11 36 00 Please Note The LGS 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 OC limits for MS/MSD's are advisory only and are not used to accept or re act batch results Linda C Schneider Project Manager 3120318 BRS <4>