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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 9673 <br /> qQor Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> 0 <br /> Pacific Environmental Group Client Project ID 920-119 1A/Chevron 9-6171 Stockton CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Dennis M Jones QC Sample Group 8020102-0106 Reported Feb 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Lead <br /> Method EPA 6010A <br /> Analyst D Knab <br /> Concentration <br /> Spiked 50 mg/kg <br /> LCS Batch# LCS020598 <br /> Date Prepared 02/05/98 <br /> Date Analyzed 02/05/98 <br /> Instrument I D # ICP-1 <br /> LCS <br /> 10 Recovery ss <br /> Control Limits 80120% <br /> MS/MSD <br /> Batch # 8020106 <br /> Date Prepared 02/05/98 <br /> Date Analyzed 02/05/98 <br /> Instrument I D # ICP-1 <br /> Matrix Spike <br /> % Recovery 101 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 99 <br /> Relative % <br /> Difference 20 <br /> Please Note <br /> The LCS rs a control sample of known interferent free matrix that Is analyzed using the same reagents <br /> EOUOIA ANALYTIC r 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 /> and are not used to accept or re ect batch results <br /> Li da C Schneider <br /> rolect Manager/Sacramento Laboratory <br /> 8020102 PES <2> <br />