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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> Avenue. Suite L Concord,CA 94520 (510) 686-9600 FAX(510)686-9689 <br /> Analytical 'T` <br /> 819St'arikce'r Avenue,Suite 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921-0100 <br /> .......... <br /> .......... <br /> ................ <br /> CON Associates Client Project Federatec..-.Manteca, 2520-100.01 <br /> 1433 N. Market Blvd. Matrix: Air <br /> Sacramento, CA 95834 <br /> Attention: Jim Pittilla QC Sample Goup: 5020887-888 Reported: Feb 24, 1995 <br /> X, <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: G.Lee C.LeeC.Lee C.Lee <br /> Concentration <br /> Spiked: 2.0 mg/m3 2.0 Mg/M3 2.0 mg/ml 6.0 mg/m, <br /> LCS Batch#: LCS0=95 LCS022295 LCS022295 LCS02=95 <br /> Date Prepared: 2/22/95 2/22/95 2/22/95 2/22/95 <br /> Date Analyzed: 2/22/95 2/22/95 2/22/95 2/22/95 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS% <br /> Recovery: 97 97 97 96 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch#: BLK022295 BLK022295 BLK022295 BLK022295 <br /> Date Prepared: 2/22/95 2/22/95 2/22/95 2/22/95 <br /> Date Analyzed: 2/22/95 2/22/95 2/22/95 2/22/95 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GGHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 97 97 97 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 95 95 95 95 <br /> Relative% <br /> Difference: 2.1 2.1 2.1 1.0 <br /> SEQUOIA 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 is used for <br /> validation of sample batch results. Due to matrix effects,the QC limits for MS/MSG's are advisory only <br /> Linda C. Schneider and are not used to accept or reject batch results. <br /> Project Manager <br /> 5020887.EMC <2> <br />