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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 /> qwr Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> CON Client Project ID ARCO 548 Stockton, CA <br /> 1433 N Market Blvd Matrix Soil <br /> Sacramento, CA 95834 <br /> Attention Mark Capps OC Sample Group 8020243-0248 Reported Mar 9, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> Cadmium Chromium Lead Nickel Zinc Lead TRPH <br /> Method EPA 6010A EPA 6010A EPA 6010A EPA 6010A EPA 6010A EPA 6010A SM 5520 DF <br /> Analyst S Philips S Philhps S Phillips S Phillips S Phillips S Phillips L M/S P <br /> Concentration <br /> Spiked 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 50 mg/kg 500 mg/kg <br /> LCS Batch# LCS021298 LCS021298 LCS021298 LCS021298 LCS021298 LCS021796 LCS021898 <br /> Date Prepared 02/12/98 02/12/98 02/12/98 02/12/98 02/12/98 02/17/98 02/18/98 <br /> Date Analyzed 02/18/98 02/18/98 02/16/98 02/18/98 02/18/98 02/19/98 02/18/98 <br /> Instrument I D # ICP-1 ICP-1 ICP-1 ECP-1 ICP-1 ICP 1 BAL-4 <br /> LCS % <br /> 10 Recovery 95 98 96 97 98 95 105 <br /> Control Limits 80-120% 80-120% 80120% 80-120% 80-120% 80-120% 70130% <br /> MS/MSD <br /> Batch # 8020241 8020241 8020241 8020241 8020241 8020361 8020248 <br /> Date Prepared 02/12/98 02/12/98 02/12/98 02/12/98 02/12/98 02/17/98 02/18/98 <br /> Date Analyzed 02/18/98 02/18/98 02/18/98 02/18/98 02/18/98 02/19/98 02/18/98 <br /> Instrument I D # ICP-1 ICP-1 ICP i ICP-1 ICP 1 ICP-1 BAL-4 <br /> Matrix Spike <br /> % Recovery 85 78 96 78 79 97 50r <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 84 73 92 77 77 87 65* <br /> Relative% <br /> Difference 12 66 4 2 1 3 26 11 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 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 OC limits for MS/MSD s are advisory only <br /> and are not used to accept or re ect batch results *Matrix Interference <br /> Ronald W Bobel <br /> Project Manager/Sacramento Laboratory <br /> 8020243 EMC <17> <br />