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� Sequoia 660 Chesapeake drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 404 N Wiget Lane Walnut Creek,CA 94596 (510) 988 9600 FAX(510)988 9673 <br /> 8 f 9 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> i <br /> Ground Zero Analysis Client Project its 95-006 / Knowles Aoek <br /> 3422 W Hammer Lane, #0-294 Matrix Air <br /> Stockton, CA 95219 <br /> Attention Justin Power QC Sample Group 5100569-576 Reported Oct 19, 1995 <br /> QUALITY CONTROL DATA REPORT <br />! Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 FFA 8020 EPA 8020 <br /> Analyst G Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 2 0 mg/m' 2 0 mg/ml 2 0 mg/m° 6 0 mg/m= i <br /> { <br /> LCS Batch# LCS101395MS LCS101395MS LC8101395MS LCS101395MS <br /> Date Prepared 10/13/95 10/13/95 10/13/95 10/13/95 <br /> Date Analyzed 10/13/95 10/13/95 10/13/95 10/13/95 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP-2 <br /> LCS % <br /> Recovery 1D3 102 101 101 <br /> Control Limits 75-125 75-125 75 125 75-125 <br /> rrr <br /> MS/MSD <br /> Batch#' 13S101395 BS101395 BS101395 BS101395 <br /> Date Prepared 10/13/95 10/13/95 10/13/95 10/13/95 <br /> Date Analyzed 10/13/95 10/13/95 10/13/95 10/13/95 <br /> Instrument i.D.# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spoke <br /> %Recovery 103 102 101 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery, 88 88 94 92 <br /> Relative% <br /> Difference 16 15 72 9 3 <br /> I <br /> ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that Is analyzed using the same reagents, <br /> %— OSEQUOIA <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> r.--- validation of sample batch results Due to matrix effects,the QC limits for MS/MSDs are advisory only <br /> Janet H an and are not used to accept or reject batch results <br /> Project anager <br /> 5100569 GGG <3> <br /> a <br />