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fSequoia�O�a 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 1 404 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 920 122 1A/Chevron 9-9840 <br /> 11315 Sunrise Gold Circle, Ste M Matrix Sod <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group 8030061-0070, 0074 Reported Mar 5, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel Zinc PCB 1260 TRPH <br /> Method EPA 6010A EPA 6010A EPA 6010A EPA 6010A EPA 6010A EPA 8080 SM 5520 CF <br /> Analyst S Phillips S Phillips S Phillips S Phillips S Phillips L Bettencourt L Martin <br /> Concentration <br /> Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 125 ug/kg 100 mg/kg <br /> LCS Batch# LCS030498 LCS030498 LCS030498 LCS030498 LCS030498 LCS030498 LCS030498 <br /> Date Prepared 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 <br /> Date Analyzed 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 <br /> Instrument I D # ICP-1 ECP-1 ICP-1 1CP-1 ICP-1 GCHP-46 IR-1 <br /> LCS <br /> Recovery 94 96 94 97 96 102 81 <br /> Control Limits 80-120% 80-120% 80-120% 80-120% 80-120% 40-140% 70-130% <br /> MS/MSD <br /> ' Batch# 7030073 7030073 7030073 7030073 7030073 8020774 8020187 <br /> Date Prepared 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 02/26/98 02/26/98 <br /> Date Analyzed 03/04/98 03/04/98 03/04/98 03/04/98 03/04/98 02/26/98 02/26/98 <br /> ' Instrument I D # 1CP-1 ICP-1 1CP-1 ECP-1 1CP 1 GCHP 4B IR-1 <br /> Matrix Spike <br /> ' % Recovery 80 78 81 90 80 57 " <br /> Matrix Spike <br /> ' Duplicate% <br /> Recovery 82 78 85 76 74 74 " <br /> Relative % <br /> ' Difference 2 5 00 4 8 17 7 8 26 " <br /> Please Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> SEQUOIA ANALYTIC L 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 /> f1 G and are not used to accept or reject batch results *Matrix Interference <br /> l� <br /> inda C Schneider <br /> Project Manager/Sacramento Laboratory <br /> 8030061 PES <17> <br />