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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 41) 404 N WAget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Wll�► Analytical 819 Striker Avenue Suite B Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OEMCON Client Project ID ARCO 548 Stockton, CA <br /> 1433 N Market Blvd Matrix Water <br /> Sacramento CA 95834 <br /> Attention Claudio Avila QC Sample Group 7080493-0498 Reported Aug 26, 1997 <br /> i <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X lenes <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# LCS081897 LCS081897 LCS081897 LCS081897 <br /> Date Prepared: 08/18/97 08/18/97 08/18/97 08/18/97 <br /> Date Analyzed: 08/18/97 08/18/97 08/18/97 08/18/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> I <br /> LCS % � <br /> Recovery 106 99 99 99 <br /> Control Limits: 70-130 70-130 70-130 70.130 <br /> MS/MSD <br /> Batch # 7080402 7080402 7080402 7080402 <br /> Date Prepared 08/18/97 08/18/97 08/18/97 08/18/97 <br /> Date Analyzed 08/18/97 08/18/97 08/18/97 08/18/97 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> %Recovery 109 102 101 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 107 100 99 99 <br /> Relative% <br /> Difference 18 20 20 20 <br /> SEQUOIA ANALYTlq�l- Please Note <br /> The LCS 1s a control sample of known interterent free matrix that 1s analyzecl 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 QC limits for MS/MSDs are advisory only <br /> Linda C Schneider and are not uses to accept or refect batch results <br /> Project Manager/Sacramento Labora ory <br /> 7080493 EMC <3> <br />