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1 Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 404 N Wiget lane Walnut Creek CA 9459$ (510) 988 9600 FAX(510)988 9673 <br /> ? *40 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *�MCON Client Project ID ARCO 548 Stockton CA <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento, CA 95834 <br /> Attention Gaudio Avila QC Sample Group 7080493-0498 Reported Aug 26 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X eves <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. S Phillips S Phillips S Phillips S Phillips <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L <br /> LCS Batch# LCS082597 LCS082597 LCS082597 LCS082597 <br /> Date Prepared 08/25/97 08/25/97 08/25/97 08/25/97 <br /> Date Analyzed: 08/25/97 08/25/97 08/25/97 08/25/97 <br /> Instrument I D.# GCHP-7 GCHP 7 GCHP-7 GCHP-7 <br /> LCS % <br /> Recovery 116 108 105 106 <br /> Control Limits. 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 7080730 7080730 7080730 7080730 <br /> Date Prepared 08/25/97 08/25/97 08/25/97 08/25/97 <br /> Date Analyzed 08/25/97 08/25/97 08/25/97 08/25/97 <br /> Instrument I D # GCHP-7 GCHP-7 GCHP-7 GCHP-7 <br /> Matrix Spike <br /> %Recovery 111 105 109 106 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 114 110 111 107 <br /> Relative% <br /> Difference 27 46 1 8 094 <br /> SEQUOIA ANALYTICAL Please Note <br /> 7 The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> zdaCZS�<chlneider <br /> preparation and analytical methods employed far the samples The LCS%recovery data is used for <br /> validation of sample patch results Due to matrix effects the QC limits for IVIS/MSDs are advisory only <br /> Iand are not used to accept or reject batch results <br /> Project Manager/Sacramento Laboratory <br /> 7080493 EMG <4> <br />