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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 (5l0) 988-9600 FAX(510)988.9673 <br /> (T�- Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 OW 6) 921.9600 FAX(916)921.0100 <br /> EMCON Client Project ID. ARCO 2186, Stockton, CA <br /> 1433 N. Market Blvd. Matrix: Soil <br /> ss <br /> Sacramento, CA 95834 <br /> Attention: Matt Turner QC Sample Group 7101233-35 Reported: Nov 14, 1997: <br /> QUALITY CONTROL DATA REPORT' <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 6010A <br /> Analyst: C. Lee C. Lee C.Lee C.Lee D. Knab <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg 50 mg/kg <br /> LCS Batch#: LCS111297 LCS111297 LCS111297 LCS111297 LCS111397 <br /> Date Prepared: 11/12/97 11/12/97 11/12/97 11/12/97 11/13/97 <br /> Date Analyzed: 11/12/97 11/12/97 11/12/97 11/12/97 11/13/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 ICP-1 <br /> • LCS % <br /> Recovery: 109 100 102 105 95 <br /> Control Limits: 70-130 70-130 70-130 70-130 80-120 <br /> MS/MSD <br /> Batch #: 7110101 7110101 7110101 7110101 7110376 <br /> Date Prepared: 11/12/97 11/12/97 11/12/97 11/12/97 11/13/97 <br /> Date Analyzed: 11/12/97 11/12/97 11/12/97 11/12/97 11/13/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 ICP-1 <br /> Matrix Spike <br /> % Recovery: 107 989 100 100 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 109 100 103 102 <br /> Relative % <br /> Difference: 1.8 2.0 3.0 2.0 <br /> • SEQUQIA 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 hatch results. Due to matrix effects,the GC limits for MS/MSD's are advisory only <br /> inda C. Schneider and are not used to accept or reject batch results. *Matrix Interference <br /> Project Manager/Sacramento Laboratory <br /> 7101233.EMC <4> <br />