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S + <br /> Sequoia 660 Chesapcakc Drive Redwood City, CA 94063 7415) 364-9600 FAX (435) 364-9233 <br /> 404N Wiget Lane Walnut Creck, CA 94596 {.510) 96A-9600 IAX (5 10) 986 9673 <br /> Analytical <br /> 10 Sinker Avenue,Suite S �dClarnentl], CA `756 34 (91 61 4)t-9600 FAX l916) 9)10100 <br /> OaCifi(, Environmental Group Client Project ID: 920-078.1A/Chevron 9-0557, Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste. M Matrix: Soil <br /> Rancho Cordova, CA 95742 <br /> Attention: Roger Hotfmore CC Sample Group 7100324-0336, 0341, 0344 Reported: Oct 24 1997: <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.free 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#: LCS101797 LCS101797 LCW1797 LCS101797 <br /> Date Prepared: 10/17/97 10/17/97 10/17/97 10/17/97 <br /> Date Analyzed: 10/17/97 10/17/97 10/17/97 10/17/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> LCS <br /> Recovery: 112 102 los 104 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch #: 7100689 7100689 7400689 7100689 <br /> Date Prepared: 10/17/97 10/17/97 10/17/97 10/17/97 <br /> Date Analyzed: 10/17/97 10/17/97 10/17/97 10/17/97 <br /> Instrument I.D.#: GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery: 112 102 105 104 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 114 104 107 105 <br /> Relative % <br /> Difference: 1.8 1.9 1.9 0.96 <br /> SEQUO ANALYTICAL Please Mote: <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 X 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 /> da C. Schneider and are not used to accept or reject batch results. <br /> roject Manager/Sacramento Labora ory <br /> 7100324.PES <10> <br /> t� <br />