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Sequoia 680 Chesapeake Drove Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> ,!D404 N Wigct Lane Walnut Creek CA 94598 (SIO) 988 9600 FAX(510)9$$ 9673 <br /> WOAnalytical 819 Sinker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 0 <br /> rzMCON Client Project ID ARCO?548, Stockton, CA <br /> 1433 N Market Blvd Matrix Sod <br /> Sacramento, CA 95834 <br /> Attention Mark Capps QC Sample Group 8020234-0241 Reported Mar 2, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene X lenes MTBE <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8260 <br /> Analyst C Lee C Lee C Lee C Lee MW/LD <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 2,500 ug/kg <br /> LCS Batch# LC8021198 LC8021198 LCS021198 LCS021198 VMB0224S <br /> Date Prepared 02/11/98 02/11/98 02/11/98 02/11/98 02/23/98 <br /> Date Analyzed 02/11/98 02/11/98 02/11/98 02/11/98 02/24/98 <br /> Instrument II D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 F3 <br /> 0 LCS % <br /> Recovery 102 98 103 102 80 <br /> Control Limits 70-130% 70130% 70-130% 70-130% 70-130% <br /> MS/MSD <br /> Batch # 8020226 8020226 8020226 8020226 9802B86-07 <br /> Date Prepared 02/11/98 02/11/98 02/11/98 02/11/98 02/20/98 <br /> Date Analyzed 02/11/98 02/11/98 02/11/98 02/11/98 02/23/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 H6 <br /> Matrix Spike <br /> % Recovery 84 86 88 88 92 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 82 82 86 87 100 <br /> Relative % <br /> Difference 24 48 23 1 1 83 <br /> jr�UIA ANALYTICAL Please Nate <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> G / 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 /> Ronald W Bobel and are not used to accept or refect batch results <br /> Project Manager/Sacramento Laboratory <br /> 8020234 EMC <14> <br />