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Sequoia 630 Chesapeake Dnvc Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510} 686 9600 FAX (510)686 %89 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 916) 921 9600 FAX(916)921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133 Stockton <br /> 9616 Micron Ave Suite 600 Matrix Water <br /> Sacramento CA 95827 <br /> Attention Mindy Patterson QC Sample Gaup 504-0346 Reported Apr 21, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes 011&Grease Lead <br /> Method EPA 8020 EPA 6020 EPA 8020 EPA 8020 FPA 418 1 EPA 200 7 <br /> Analyst C Chapman C Chapman C Chapman C Chapman V Owens K Barta <br /> Concentration <br /> Spiked. 10 pg/L 10Ng/L 10 ug/L 30lig/L 4 0 mg/L 0 50 mg/L <br /> LCS Batch#- LCSO41895 LCSO41895 LCSO41895 LCSO41895 LCSO42095 LCSO41195 <br /> Date Prepared- 4/18/95 4/18/95 4/18/95 4/18/95 4/20/95 4/11/95 <br /> Date Analyzed- 4/18/95 4/18/955 4/18/95 4/18/95 4/21/95 4/17/95 <br /> Instrument I D.#` GCHP-1 GCHP-1 GCHP-1 GCHP-1 IR-1 P 40 <br /> LCS % <br /> Recovery- 94 97 94 96 92 104 <br /> Control Limits- 75-125 75.125 75-125 75-125 80-120 80-120 <br /> MS/MSD <br /> Batch#: 5040398 5040398 5040398 5040398 BLK041395 5040347 <br /> Date Prepared: 4/18/95 4/18/95 4/18/95 4/18/95 4/13/95 4/11/95 <br /> Date Analyzed. 4/18/95 4/18/95 4/18/95 4/18/95 4/14/95 4/17/95 <br /> Instrument I D #: GCHP-1 GCHP-1 GCHP-1 GCHP-1 IR-1 P 40 <br /> Matrix Spike <br /> % Recovery 96 94 95 97 82 102 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 86 87 86 90 82 106 <br /> Relative% <br /> Difference: 11 77 99 75 00 3 8 <br />. SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interferent free matrix that 1s analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matrix effects the OC limits for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 5040346 BRS <4> <br />