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SequoiaChesapeake Drive Redwood City, CA 94063 ) 364-9600 FAX (415) 364-9233 <br /> 4 N.Wiget Lane Walnut Creek, CA 94598 1� 0) 988-9600 FAX(MCI)98 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 9219600 FAX 6%'a2Z PO{f,0, <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 6020607-0609 Reported: Feb 16, 1996';i< <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: C. Lee G.Lee C.Lee C.Lee <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> LCS Batch#: LCS021496 LCS021496 LCS021496 LCS021496 <br /> Date Prepared: 02/16/96 02/16/96 02/16/96 02/16/96 <br /> Date Analyzed: 02/16/96 02/16/96 02/16/96 02/16/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS % <br /> Recovery: 89 92 94 94 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch #: BS021496B BS0214968 BS021496B BS0214968 <br /> Date Prepared: 02/14/96 02/16/96 02/16/96 02/16/96 <br /> Date Analyzed: 02/14/96 02/14/96 02/14/96 02/14/96 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> %Recovery: 85 89 89 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 76 79 78 81 <br /> Relative% <br /> Difference: 11 12 13 13 <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 /> :aria <br /> validation of sample batch results. Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> Janet and are not used to accept or reject batch results. <br /> Project McMager/Sacramento Labora ory <br /> 6020607.EMC <3> <br />