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5 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (5t0) 988 9600 FAX(5t0) 988 %73 <br /> *"-r Analytical 8 t9 Striker Avenue Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX(916) 921 0100 <br /> EMCCIN Associates <br /> Client Prolect ID Arco #6100, Tracy, CA <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Claudio Avila CC Sample Group 5061537-540 Reported Jul 7, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst- Chiaravalioti Chlaravallati Chiaravalloti Chtaravalloti <br /> Concentration <br /> Spiked: 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch#- LCS070695 LCS070695 LCS070695 LCS070695 <br /> Date Prepared' 7/6/95 7/6/95 7/6/95 7/6/95 <br /> Date Analyzed: 7/6/95 7/6/95 7/6/95 7/6/95 <br /> Instrument I.D.#: GCHP-1 GCHP 1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery- 96 96 97 97 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #- 5061779 5061779 5061779 5061779 <br /> Date Prepared 7/6/95 7/6/95 7/6/95 7/6/95 <br /> Date Analyzed: 7/6/95 7/6/95 7/6/95 7/6/95 <br /> Instrument I D #- GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery: 87 90 92 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 93 95 96 97 <br /> Relative% <br /> Difference: 67 5 4 42 42 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> nn ' 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 QC 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 /> 5061537 EMC <2> <br />