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I <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> WWI 404 N WiBet Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite F Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Ground Zero Analysts Client Project its 95-006/Knowles poek <br /> 3422 W Hammer Lane, #C-294 Matrix Air <br /> Stockton, CA 95219 <br /> Attention Justin Power OC Sample Group 5100569-576 Reported Oct 19, 1995 <br /> ' QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> ' Method EPA 8020 EPA 8020 EPA 8020 CPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked: 2 0 mg/ml 2 0 mg/m3 2 0 mg/ml 6 0 mg/ml <br /> LCS Batch#. LCS101695 LCS101695 LCS101695 LCS101695 <br /> Date Prepared 10/16/95 10/16/95 10,(16/95 10/16/95 <br /> Date Analyzed. 10/16/95 10/16/95 10,16/95 10/16/95 <br /> Instrument 1.13# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery 101 99 99 100 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# B8101695 DS101695 BS101695 SS101695 <br /> Date Prepared- 10/16/95 10/16/95 10f16/95 10/16/95 <br /> Date Analyzed: 10/16/95 10/16/95 10f16/95 10/16/95 <br /> Instrument I D# GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery, 104 103 102 101 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 98 98 97 <br /> Relative% <br /> Difference' 39 49 40 40 <br /> EQUOIA ANALYTICAL 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 1s used for <br /> validation of sample batch results Due to matrix effects,the CC limits for MS/MSDs are advisory only <br /> Janet Tian and are not used to accept or reject batch results <br /> Projec onager <br /> 5100569 GGG ¢4> <br />