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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Ueinfelder Client Project ID 20-1129-30 G01 <br /> ' 2825 East Myrtle St Matrix <br /> Stockton, CA 95205 <br /> Attention Roman Racca QC Sample Group 7060644-0645 Reported Jun 23, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE' 1,1-Dichloro- Chloro- <br /> ethene Trichloroethene Benzene Toluene benzene <br /> ' Method EPA 8240 EPA 8240 EPA 8240 EPA 8240 EPA 8240 <br /> Analyst K Pocan K Pocan K Pocan K Pocan K Pocan <br /> ' Concentration <br /> Spiked 50ug/L 50ug/L 50ug/L 50ug/L 50ug/L <br /> LCS Batch# LCS062097 LCS062097 LCS062097 LCS062097 LCS062097 <br /> ' Date Prepared 06/20/97 06/20/97 06/20/97 06/20/97 06/20/97 <br /> Date Analyzed 06/20/97 06/20/97 06/20/97 06/20/97 06/20/97 <br /> ' Instrument I D # MS-Fl MS-171 MS-F1 MS-F1 MS-Fl <br /> LCS % <br /> Recovery 94 119 110 124 117 <br /> Control Limits 65-135 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 7060393 7060393 7060393 7060393 7060393 <br /> Date Prepared 06/18/97 06/18/97 06/18/97 06/18/97 06/18/97 <br /> Date Analyzed 06/18/97 06/18/97 06/18/97 06/18/97 06/18/97 <br /> ' Instrument I D # MS-F1 MS-F1 MS-Ft MS-F1 MS-F1 <br /> Matrix Spike <br /> %Recovery 124 128 132 119 114 <br /> Matrix Spike <br /> Duplicate% <br /> ' Recovery 107 104 109 99 101 <br /> Relative% <br /> Difference 15 21 19 18 12 <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> Ar M validation of sample batch results Due to matrix effects the QC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results <br /> Edana M Fruclano <br /> Project Manager/Sacramento Laboratory <br /> 7060644 KLF <7> <br />