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Sequoia 819 Striker Avenue Suite 8 <br /> Sacramento CA 95834 <br /> (916) 921-9600 <br /> Analytical FAX(916) 921-0100 <br /> l=C6R Intemational Client project I0 ` " ARCO 2098, Tracy,`CAV <br /> 9912 Business Park Dr, Ste 100 Matrix Air <br /> Sacramento, CA 95827 <br /> t Attention Rusty Benkosky QC Sample Group S906340 Reported Jul 7, 1999' <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst. J Minkel J Minkel J Minkel J Minkel <br /> Concentration <br /> Spiked 2 0 mg/m' 2 0 mg/m' 2 0 mg/m' 6 0 mglm' <br /> LCS Batch# 2LCS062399 2LCS062399 2LCS062399 2LCS062399 <br /> Date Prepared 06/23/99 06/23/99 06/23/99 06/23/99 <br /> Date Analyzed 06/23/99 06/23/99 06/23/99 06/23/99 <br /> Instrument I D# HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 95 90 90 102 <br /> ,*C Recovery <br /> Limits 70-130% 70-130% 70-130% 70-130% <br /> MSIMSD <br /> Batch#: 100 ng STEX 100 ng BTEX 100 ng BTEX 100 ng BTEX <br /> Date Prepared 06/18/99 06/18/99 06/18/99 06/18/99 <br /> Date Analyzed 06/18/99 06/18/99 06/18/99 06/18/99 <br /> Instrument LD#: HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery 80 70 75 82 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 75 65 75 72 <br /> Relative% <br /> Difference: 65 74 00 13 <br /> SEQUOIA ANALYTIC A ease Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents, <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matnx effects,the QC limits for MSIMSD's are advisory only <br /> WJectManager/S3crame, <br /> dra R Hanson and arenct used to accept or reject batch resultsto t auor, - "--' -- -- <br /> S906340 SES <3> <br />