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Redwood City,CA 94063 364-9600 FAX(415) 364-9233 <br /> Sequoia hesape"ake Drive -9600 F"(51U)=W$1%7 3 <br /> Wiget Lane Walnut Creek,CA 94599 Q 988 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95814 (916) 921-9600 FAX(916)9210100 <br /> .......... <br /> EMCON Associates .......Client Project ID: Arco 2168, Stockton, CA' <br /> 1433 N. Market Blvd. Matrix: Soil <br /> Sacramento, CA 95834 <br /> Attention: Claudio Avila OC Sample Group 6020610-0611 Reported: Feb 29, 1996 <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: V.Owens V.Owens V.Owens V,Owens <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> LCS Batch#: i-CSO=96 LCS0=96 LCS022296 LGS0=96 <br /> Oat:e Prepared: 02/22/96 02/22/96. 02/22/96 02/22/96 <br /> Date Analyzed: 02/22/96 02/22/96 02/22/96 02/22/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery: 91 94 94 95 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> F.: <br /> MS/MSD <br /> Batch#: 6020982 6020982 6020982 6020982 <br /> Date Prepared: 02/22/96 02/22/96 02/22/96 02/22/96 <br /> Date Analyzed: 02/22/96 02/22/96 02/22/96 02/22/96 <br /> Instrument I.D.#: GCHP-1 GCHP4 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery: 89 92 90 92 <br /> Matrix Spike <br /> Duplicate % <br /> I Recovery: 92 94 94 95 <br /> Relative% <br /> Difference: 3.3 2.2 4.3 3.2 <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 /> s <br /> preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> validation of sample batch results. flue to matrix effects,the OC limits for MS/MSD's are advisoryonly <br /> Janet H,11an and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Laboratory 6020610,EMC <3> <br />