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4DSequoia 680 Chesapeake Drive Redwood City, CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 404 N.Wiget Lane Walnut Creek, CA 9459$ (510) 988.9600 FAX(510)988-9673 <br /> war 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAx (916) 921.0100 <br /> Clientrojecf ID. A1C ?218 ; Stockton, CA <br /> 7433 N. Market Blvd. Matrix: <br /> Sacramento, CA 95834 Water <br /> Attention Claudio Avila QC Sample Group 7080799-0802 <br /> Reported: Sep 4. 7997' <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Ethyl- <br /> Benzene Toluene Benzene <br /> Xylenes <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: S. Phillips S.Phillips S.Phillips S.Phillips <br /> Concentration <br /> Spiked: 10 ug/L 10 u9/L 10 ug/L 30 ug/L <br /> LCS Batch#: LCS082797 LCS082797 LCS082797 LCS082797 <br /> Date Prepared: 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Date Analyzed: 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Instrument I.D,#: GCHP-7 GCHP-7 GCHP-7 <br /> GCHP-7 <br /> LCS <br /> Recovery: 101 0 <br /> 95 93 94 <br /> Control Limits: 70-130 70-130 <br /> 70-130 70130 <br /> MS/MSD <br /> Batch#: 7080800 7080800 7080800 7080800 <br /> Date Prepared: 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Date Analyzed: 08/27/97 08/27/97 08/27/97 08/27/97 <br /> Instrument I.D.#: GCHP-7 GCHP-7 GCHP-7 <br /> GCHP-7 <br /> Matrix Spike <br /> %Recovery: 98 <br /> 93 92 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 94 93 92 <br /> Relative% <br /> Difference: 2.0 1.1 <br /> 1.1 0.0 <br /> SEQU lA ANALYTI L Please Nate: <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 usea`_r <br /> validation of sample batch results. Due to matrix effects,the QC limits for MS/MSD's are advisory enly <br /> inda C. Se neider and are not used to accept or reject batch results. <br /> Project Manager/Sacramento Lab...LUI y <br /> 7080799.EMC <3> <br />