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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 /> �,,,,�► Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)911 0100 <br /> CA <br /> EMCON Client Project It] A8CO 548, Stockton, <br /> 1433 N Market Blvd Matrix Soli <br /> Sacramento, CA 95834 Reported Feb 19, 1998 <br /> Attention Mark Capps QC Sample Group 802-0242 p <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Hexavalent <br /> Cadmium Chromium Lead Nickel 7-inc Chromium <br /> Method EPA 6010A EPA 6010A EPA 6010A EPA 6010A EPA 6010A EPA 7196 <br /> Analyst S Phillips S Phillips S Phillips S Phillips S PhMips S Phillips <br /> Concentration <br /> Spiked 50 mg/kg 50 m9/k9 50 m9/k9 50 mg/kg 50 m9/kg 2 5 rng/kg <br /> LCS Batch# LCS021298 LCS021298 LCS021298 LCS021298 LCS021298 LCS021798 <br /> Date Prepared 02/12/98 02/12/98 02/12/98 02/12/98 02/12/98 02/17/98 <br /> Date Analyzed 02/18/98 02/18/98 02/18/98 02/18/98 02/18/98 02/17/96 <br /> Instrument I D # ICP-1 IGP-1 iCP-1 ICP-1 ICP-1 W-1 <br /> LCS <br /> Recovery 95 98 96 97 98 98 <br /> Control Limits 80120% 80-120% 80-120% 80-120% 80 120% 80 120% <br /> MS/MSD <br /> Batch # 8020241 8020241 8020241 8020241 8020241 8020248 <br /> Date Prepared 02/12/98 02/12/98 02/12/98 02/12/98 02/12/98 02/17/98 <br /> Date Analyzed 02/18/98 02/18/98 02/18/98 02/18/98 02/18/98 02/17/98 <br /> Instrument I D # ICP 1 1CP 1 ICP 1 ICP-1 ICP-1 JV 1 <br /> Matrix Spike <br /> % Recovery 85 78 96 7a 7s 97 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 84 73 92 77 77 114 <br /> Relative <br /> Difference 12 66 42 13 <br /> 2 s 1s <br /> Please Note <br /> The LCS Is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> UOIA 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 C1C limas for lv1S/MSDs are advisory only <br /> ✓ /��� and are not used to accept or reject batch results <br /> Ronald W Sobel ((( <br /> Project Manager/Sacramento Laboratory <br /> 8D20242 EMC <85 <br />