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(D(D— <br /> ` Sequoia ehesapeake Drive Redwood City, CA 94063 �) 364-9600 FAX(415) 364-9233 <br /> — N.Wiget Lane Walnut Creek, CA 94598 ) 988-9600 FAX'(510)'988-9673' <br /> �I� Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 9219600 FAXn(❑❑916)921-0 100 <br /> ,'Flai j ar.... <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 QC Sample Grou 602-0612 Reported: Feb 22, 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#: LCS022196 LCS022196 LCS022196 LCS022196 <br /> Date Prepared: 02/21/96 02/21/96 02/21/96 02/21/96 <br /> Date Analyzed: 02/21/96 02/21/96 02/21/96 02/21/96 <br /> Instrument I.D.#: GCHP-11 GCHP-1 GCHP-1 GCHP-1 <br /> LCS% <br /> Recovery: 92 95 96 97 <br /> Control Limits: 75-125 75-129 75-125 75.125 <br /> MS/MSD <br /> Batch #: 6020816 6020816 6020816 6020816 <br /> Date Prepared: 02/21/96 02/21/96 02/21/96 02/21/96 <br /> Date Analyzed: 02/21/96 02/21/96 02/21/96 02/21/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery: 89 90 90 91 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 86 87 88 88 <br /> Relative% <br /> Difference: 3.0 3.0 2.0 3.0 <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 OC limits for MS/MSD's are advisory only <br /> Janet Ha rlan and are not used to accept or reject batch results. <br /> Proje6 Manager/Sacramento Labora ory <br /> 6020612.EMC <4> <br /> 7a <br />