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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415)964.9233 <br /> 404 N,Wiget Looe Walnut Creek,CA 94598 (510) 988.9600 FAX(510)988.9673 <br /> 'RuP Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-Ot00 <br /> ASSOCtates <br /> Client F'roiect Ili;.. Arco 2186, Stockton /T-C). #17856 <br /> 1433 N. Market Blvd. Matra: Soil <br /> Sacramento, CA 95834 `} <br /> Attention: Claudio Avila QC Sample Group 5090285-296 Reported: Sep 22 1995' <br /> --.:-..........-.-...:......:...-.....:.:..:....:7..:...- v:t.. <br /> QUALITY CONTROL DATA REPORT <br />' AN --- <br /> AI TE 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#: LCS091995 LCS091995 LCS091995 LCS091995 <br /> Date Prepared: 9/19/95 9/19/95 9/19/95 9/19/95 <br /> Date Analyzed: 9/19/95 9/19/95 9/19/95 9/19/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS <br /> Recovery: sa se 101 100 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> ::................::.::.:.::: :::....................... ::::•::::.:::. <br /> ::,:.::..::.:.:.:: .. :::.:.:. <br /> MS/MSD V <br />' Batch#: 5090295 5090295 5090295 5090295 <br /> Date Prepared: 9/19/95 9/19/95 9/19/95 9/19/95 <br /> t Date Analyzed: 9/19/95 9/19/95 9/19/95 9/19/95 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br />' Matrix Spike <br /> %Recovery: 88 89 88 91 <br /> Matrix Spike <br />' Duplicate% <br /> Recovery: 95 96 9e 98 <br />' Relative% <br /> Difference: 7.6 7.6 8,7 7.4 <br /> SEQUOIA ANALYTICAL Please dote: <br /> The LCS 13 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 aro advisory only <br /> Janet H an and are not used to accept or reject batch results. <br /> Project anager <br />' 5090285.EMC <6> <br />