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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 1900 Bates Avenue butte L Concord CA 94520 15101 686%00 FAX(510)686 9689 Analytical 819 Stn ker Avenue -juste 8 Sacramento CA 95834 1916) 921 9600 FAX (916)921 0100 Brown & Caldwell Client Project 1D Arco 2133, Stockton 9616 Micron Ave, Suite 600 Matrix Water Sacramento, CA 95827 Attention Mindy Patterson QC Sample Goup 503-0457 Reported Mar 22, 1995 QUALITY CONTROL DATA REPORT ANALYTE Ethyl- Benzene Toluene Benzene Xylenes TRPH Lead Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 418 t EPA 200 7 Analyst C Lee C Lee C Lee C Lee V Owens K Barts Concentration Spiked. 10 ug/L 10 ug/L 10 ug/L 30 ug/L 4 0 mg/L 0 50 mg/L LCS Batch# LCS031395 LCS031395 LCS031395 LCS031395 LGS032295 LCS031095 Date Prepared: 3/13/95 3/13/95 3/13/95 3/13/95 3/22/95 3/10/95 Date Analyzed: 3/13/95 3/13/95 3/13/95 3/13/95 3/22/95 3/17/95 Instrument LD # GCHP-2 GCHP-2 GCHP-2 GCHP-2 I11-1 P-40 . LCS'/a Recovery* 9e ss 97 97 80- too Control Limits: 75-125 75-125 75.125 75-125 80-120 80.120 MS/MSD Batch# 5030259 5030259 5030259 5030259 131-K032095 5030556 Date Prepared: 3/13/95 3/13/95 3/13/95 3/13/95 3/20/95 3/14/95 Date Anaiyzed: 3/13/95 3/13/95 3/13/95 3/13/95 3/20/95 3/17/95 Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 IR-1 P-40 Matrix Spike Recovery: 97 96 96 97 92 105 Matrix Spike Duplicate% Recovery: 98 96 98 100 92 108 Relative% Difference: 1 0 00 20 3 0 00 2.8 SEQUOIA ANALYTICAL Please Note . The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS%recoverydata is used for validation of sample batch results Due to matrix effects,the OC limits for MS/MSD's are advisory only Jennie Higgins and are not used to accept or reject batch results Project Manager 5030457t3RS <4>