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01 <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 <br /> 1900 Bates Avenue,Suite L Concord,CA 94520 FAX(415) 364.9233 <br /> oo <br /> Analytical 819 Striker Avenue.5uitc 8 9689 <br /> Sacramento,CA 95834 (916) 921-960() FAX(916)921 pIGO <br /> EMCON Associates <br /> Client Project ID: Federated Mariteca,2520 100.01 <br /> 1433 N. Market Blvd. Matrix: Air <br /> Sacramento, CA 95834 <br /> Attention Jim Pittllla QC Sample Goup 5020887-888 <br /> Reported: Feb 24, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xyienes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C.Lee C.Lee C.Lee C.Lee <br /> Concentration <br /> Spiked: 2.0 mg/m3 2.0 mg/m3 2.0 mg/m3 6.0 mg/m3 <br /> LCS Batch#: LCS022295 LCS022295 LCS022295 LCS022295 <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 13LK022295 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 GCHP-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 sampis of known,interferent free matrix that is analyzed using the same reagents, <br /> preparation and anal cal methods emoioyed for the Samples. The LCS%recovery data is used for <br /> validation of sample batch results. Due to matrix effects,the QC limits fo <br /> / Linda C. Schneider r MS/Ms0's are advisory only <br /> / and are not used to accept or reject batch results. <br /> Project Manager <br /> 5020887.EMC ¢2> <br />