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Sequoia 690 Chesapeake Drive Rcdvood City CA 94063 •(415) 364.9600 FAX(415) 364-9233 <br /> (i) 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)989-9673 <br /> TAW Analytical 819 Striker Avenue,Suite a Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> ............- .......... ...... <br /> einfelder 'ectlo. ' �ff��0Mi <br /> Client Proj <br /> 2825 East Myrtle St. Matrix: Sol[/Water <br /> Stockton, CA 95205 <br /> Attention: Tony Martin QC Sample Group 7090412-0431 Report <br /> ed: Sep 18, 1997'," <br /> xx <br /> X�. <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes MTBE MTBE <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 EPA 8260 <br /> Analyst: M.C. M.G. M.C. M.C. M.Williams M.Williams <br /> Concentration <br /> Spiked: 10 ug/L 10 ug/L 10 ug/L 30 ug/L 2,500jig/kg 50yg/L <br /> LCS Batch#: LCS091097 LCS091097 LCS091097 LCS091097 LCS091097 LCS091197 <br /> Date Prepared: 09/10/97 09/10/97 09/10/97 09/10/97 09/10/97 09/11/97 <br /> Date Analyzed: 09/10/97 09/10/97 09/10/97 09/10/97 09/10/97 09/11/97 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 H6 H6 <br /> LCS % <br /> Recovery: 109 104 102 105 92 86 <br /> Control Limits: 70-130 70-130 70130 713-130 70-130 70-1130 <br /> ........... ox'-" <br /> ....... <br /> n <br /> MS/MSD <br /> Batch #: 7090431 7090431 7090431 7090431 970935301 970863010 <br /> Date Prepared: 09/10/97 09/10/97 09/10/97 09/10/97 09/10/97 09/11/97 <br /> Date Analyzed: 09/10/97 09/10/97 09/10/97 09/10/97 09/10/97 09111/97 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 F3 H6 <br /> Matrix Spike <br /> %Recovery: 109 100 100 99 96 84 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 107 98 98 96 104 114 <br /> Relative% <br /> Difference: 1.8 2.0 2.0 3.1 8.0 0.0 <br /> ^EQUOIA ANALYT19AL Please Note: <br /> 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 /> validation of sample batch results. Due to matrix effects,the GG limits for MS/MSD's are advisory only <br /> I?nd ch eider and are not used to accept or reject batch results. <br /> C. <br /> Pro -F— <br /> lect Manager/Sacramento Labors To y <br /> 7090413.KLF <8> <br />