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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 4D 404 N 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 /> 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 QC Sample Group 801-0987 Reported Feb 12, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> TRPH Cadmium Chromium Lead Nickel Zinc <br /> Method SM 5520 EF EPA 6010A EPA 6010A EPA 6010A EPA 6010A EPA 6010A <br /> Analyst L M/S P D Knab D Knab D Knab D Knab D Knab <br /> Concentration <br /> Spiked 500 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg <br /> LCS Batch# LCS021098 LCS020398 LCS020398 LCS020398 LCS020398 LCS020398 <br /> Date Prepared 02/10/98 02/03/98 02/03/98 02/03/98 02/03/98 02/03/98 <br /> Date Analyzed 02/10/98 02/03/98 02/03/98 02/03/98 02/03/98 02/03/98 <br /> Instrument I D # BAL-4 ICP-1 ICP-1 ICP-1 ICP-1 ICP-1 <br /> LCS <br /> Recovery ill 97 99 100 100 100 <br /> Control Limits 70-130% 80-120% 80-120% 80 120% 80-120% 80-120% <br /> M5/MSD <br /> Batch# 8010967 8010995 8010995 8010995 8010995 8010995 <br /> Date Prepared 02/10/98 02/03/98 02/03/98 02/03/98 02/03/98 02/03/98 <br /> Date Analyzed 02/10/98 02/03/98 02/03/98 02/03/98 02/03/98 02/03/98 <br /> Instrument I D # BAL-4 ICP-1 ICP-1 ICP-1 ICP 1 lCP-1 <br /> Matrix Spike <br /> % Recovery 98* 92 88 106 93 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 30* 91 91 105 98 94 <br /> Relative% <br /> Difference 106* 1 1 33 095 5 2 22 <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/MSDs are advisory only <br /> tc <br /> and are not used to acce t or re ect batch results *Matrix Interference <br /> IInda C h eider <br /> Project Manager/Sacramento Laboratory <br /> t <br /> 8010987 PES <13> <br />