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IN <br /> 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)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX (916)92 1-0 100 <br /> Kleinfelder Client Project ID: 20-2245-32 <br /> 2825 East Myrtle St. Matrix: Soil <br /> Stockton, CA 95205 <br /> Attention: Roman Racca QC Sample Group 7110340-0345 Reported: Nov 17, 1997' <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes Diesel <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 DHS LUFT <br /> Analyst: C.Lee 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 12.5 mg/kg <br /> LCS Batch#: LCS111397 LCS111397 LCS111397 LCS111397 LCS111097A <br /> Date Prepared: 11/13/97 11/13/97 11/13/97 11/13/97 11/10/97 <br /> Date Analyzed: 11/13/97 11/13/97 11/13/97 11/13/97 11/13/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-3B <br /> LCS % <br /> Recovery: 103 94 96 96 98 <br /> Control Limits: 70-130 70-130 70-130 70-130 60-140 <br /> :.......;.:::::::.;::..... .......: <br /> MS/MSD <br /> Batch #: 7110301 7110301 7110301 7110301 7110270 <br /> Date Prepared: 11/13/97 11/13/97 11/13/97 11/13/97 11/10/97 <br /> Date Analyzed: 11/13/97 11/13/97 11/13/97 11/13/97 11/14/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 GCHP-3B <br /> Matrix Spike <br /> % Recovery: 101 93 95 95 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 103 98 96 95 ' <br /> Relative % <br /> ' Difference: 2.0 5.2 1.0 0.0 ' <br /> SEQU IA ANALYTI L 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 batch results. Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> I Inda C. Schneider and are not used to accept or reject batch results. `Matrix Interference <br /> Project Manager/Sacramento Labora ory <br /> 7110340.KLF -_3; <br /> t� <br />