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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 /> ftill>� Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Pacific Environmental Group Client Project ID 920-119 1A/Chevron 9-6171 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson GSC Sample Group 8010367-0369 Reported Jan 20 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Mercury Arsenic Cadmium Chromium Lead Nickel <br /> Method EPA 7471 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 EPA 200 7 <br /> Analyst P Kent D Knab D Knab D Knab D Knab D Knab <br /> Concentration <br /> Spiked 0 25 mgkg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> LCS Batch# LCS011598 LCS011398 LCS011398 LCS011398 LCS011398 LCS011398 <br /> Date Prepared 01/15/98 01/13/98 01/13/98 01/13/98 01/13/98 01/13/98 <br /> Date Analyzed 01/16/98 01/15/98 01/15/98 01/15/98 01/15/98 01/15/98 <br /> Instrument I D # HG 1 ICP 1 ICP 1 ICP 1 ICP 1 1CP 1 <br />• LCS <br /> r Recovery 95 93 94 97 95 96 <br /> Control Limits 80-120 80 120 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch# 8010384 8010355 8010355 8010355 8010355 8010355 <br /> Date Prepared 01/15/98 01/13/98 01/13/98 01/13/98 01/13/98 01/13/98 <br /> Date Analyzed 01/16/98 01/15/98 01/15/98 01/15/98 01/15/98 01/15/98 <br /> Instrument I D # HG-1 ICP-1 ICP-1 ICP 1 ICP-1 ICP-1 <br /> Matrix Spike <br /> % Recovery 96 77 80 96 59 72 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 72 75 75 58 72 <br /> Relative % <br /> Difference 1 0 67 64 14 1 2 00 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> *SEQUOIA 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 /> Y �/ t' 9(�L-G�! and are not used to acce t or reject hatch results <br /> f lLinda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 8010367PES <16> <br />