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� <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 K 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)921-0100 <br /> 4QF <br /> .................. <br /> Group ......... fie'rit'..'Project r,oj..act CA .......... <br /> 11315 Sunrise Gold Circle, Ste. M Matrix: Soil <br /> Rancho Cordova, CA 95742 <br /> Attention: Rusty Benkosky QC Sample Group 7110397-0402 Reported: Dec 3, 1997rr <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: S.Phillips S.Phillips S.Phillips S.Phillips <br /> Concentration <br /> Spiked: 0.20 mg/kg 0.20 mg/kg 0.20 mg/kg 0.60 mg/kg <br /> LCS Batch#: LCSl 11897 LCSl 11897 LCS111897 LCS1 11897 <br /> Date Prepared: 11/18/97 11/18/97 11/18/97 11/18/97 <br /> Date Analyzed: 11/18/97 11/18/97 11/18/97 11/18/97 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GGHP-2 GCHP-2 <br /> LCS % <br /> Recovery: 108 101 97 93 <br /> Control Limits: 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch #: 7110336 7110336 7110336 7110336 <br /> Date Prepared: 11/18/97 11/18/97 11/18/97 11/18/97 <br /> Date Analyzed: 11/18/97 11/18/97 11/18/97 11/18/97 <br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2 <br /> Matrix Spike <br /> % Recovery: 104 98 94 94 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery: 102 94 92 88 <br /> Relative % <br /> Difference: 1-9 4.2 22 6.6 <br /> SE9/UPIA ANALYT19AL 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 OC limits for MS/MSD's are advisory only <br /> Indo C. Schneider <br /> and are not used to accept or reject batch results. <br /> Project Manager Sacramento <br /> boraTory <br /> 7110397PES -9 <br />