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} <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)488 9673 <br /> q1W Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OCON <br /> Client Protect ID ARCO 548, Stockton, CA <br /> 1433 N Market Blvd Matrix Soil <br /> Sacramento, CA 95,934 <br /> Attention Mark Capps QC Sample Group 8020243-0248 Reported Mar 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 11-Dichloro- Trichloro- Chloro- <br /> ethane ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Pocan K Pocan K Pocan <br /> Concentration <br /> Spiked 200ug/K9 200ug/Kg 200ug/Kg <br /> LCS. Batch# LCS022498 LCS022498 LCS022498 <br /> Date Prepared 02/24/98 02/24/98 02/24/98 <br /> Date Analyzed 02/24/98 02/24/98 02/24/98 <br /> Instrument I D # MS F1 MS-F1 MS-Fl <br /> LCS % <br /> 40 Recovery 106 101 97 <br /> Control Limits 65-135% 70130% 70-130% <br /> MS/MSD 8020242 8020242 <br /> Batch # 8020242 8020242 8020242 <br /> Date Prepared 02/17/98 02/17/98 02/17/98 <br /> Date Analyzed 02/17/98 02/17/98 02/17/98 <br /> Instrument I D # GC-5 GC-5 GC-5 <br /> Matrix Spike <br /> % Recovery 107 103 101 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 119 116 115 <br /> Relative % <br /> Difference 11 12 13 <br /> Please Note <br /> The LCS 1s a control sample of known interferent tree matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTICAL 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 /> and are not used to accept or reect batch results <br /> Ronald W Babel <br /> Project Manager/Sacramento Laboratory <br /> 8020243 EMC <16> <br />