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Sequoia 680 Chesapeake Drive Redwood Ctty 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 /> 44 QpAnalytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group Client Project ID 920 122 1A/Chevron 9-9840 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group 803-0557 Reported Mar 16, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel Zinc Mercury <br /> Method EPA 6010B EPA 60108 EPA 50108 EPA 6010B EPA 6010B EPA 7471 <br /> Analyst S Phillips S Phillips S Phillips S Phillips S Phillips P Kent <br /> Concentration <br /> Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 0 25 mg/kg <br /> LCS Batch# LCS030498 LCS030498 LCS030498 LCS030498 LCS030498 LCS031698 <br /> Date Prepared 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 03/16/98 <br /> Date Analyzed 03/15/98 03/15/98 03/15/98 03/15/98 03/15/98 03/16/98 <br /> Instrument I D # iCP-1 ICP-1 ICP-1 1CP-1 ICP-1 HG-1 <br /> LCS <br /> Recovery 97 100 97 100 99 99 <br /> Control Limits 80-120% 80-120% 80-120% 60-120% 80-120% 80-120% <br /> MS/MSD <br /> Batch# 8030073 8030073 8030073 8030073 8030073 8030428 <br /> Date Prepared 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 03/16/98 <br /> Date Analyzed 03/15/98 03/15/98 03/15/98 03/15/98 03/15/98 03/16/98 <br /> Instrument I D # lCP-1 ICP-1 ICP-1 ICP-1 ICP-1 HG 1 <br /> Matrix Spike <br /> % Recovery 84 82 89 94 85 96 <br />' Matrix Spike <br /> Duplicate % <br /> Recovery 84 80 90 78 77 97 <br />' Relative % <br /> Difference 00 25 11 20 99 1 0 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQU lA ANALYTICAL 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 /> Linda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 8030557 PES 44> <br />