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Sequoia 680 Chesapeake Drive Redwood City, CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N, Wiget Lane Walnut Creek, CA 94598 (510) 988-9600 FAX(510)988-%73 <br /> Iwo Analytical 819 Striker Avenue, Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0 100 <br /> EMCON Client. Project ID ARCO 2186, Stockton, CA <br /> 1433 N. Market Blvd. Matrix: Soil <br /> Sacramento, CA 95834 <br /> Attention: Matt Turner CC Sample Group 7101233-35 Reported: Nov 14, 199T" <br /> ............ ....... <br /> .. ............ a .. ..... ... .. ..... <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 C. 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#: LCSI 11097 LCS1 11097 LCS1 11097 LCS1 11097 <br /> Date Prepared: 11/10/97 11110197 11/10/97 11/10/97 <br /> Date Analyzed: 11/10/97 11/10/97 11/10/97 11/10/97 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 98 94 91 91 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> ............ <br /> MS/MSD <br /> Batch #: 7101234 7101234 7101234 7101234 <br /> Date Prepared: 11/10/97 11/10/97 11/10/97 11/10/97 <br /> Date Analyzed: 11/10/97 11/10/97 11/10/97 11/10/97 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 94 89 87 84 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 94 88 86 82 <br /> Relative % <br /> Difference: 010 1.1 1.2 2.4 <br /> • XSEQU IA ANALYTIC L Please Note: <br /> "U <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 resuits. Due to matrix effects.the QC limits for MS/MSD's are advisory only <br /> nVC'. Schneider and are not used to accept Or reject batch results. <br /> r ro. ct <br /> oJect Manager/Sacramento Laboratory <br /> 7101233.EMC <5> <br /> V <br />