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i SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 e FAX (916) 921-0100 <br /> Brown &Caldwell Client Project ID Arco 2133-93-5, Stockton 0 <br /> P O Box 13449 Matrix Sod <br /> Sacramento, CA 95813-3449 <br /> Attention Steve Misner QC Sample Group 3100713-724 Reported Nov 8, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> J= ANALYTE - Ethyl n <br /> Benzene Toluene benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Chapman C Chapman C Chapman C Chapman <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS102893 LCS102893 LCS102893 LCS102893 <br /> Date Prepared 10/28/93 10/28/93 10/28/93 10/28/93 y <br /> Date Analyzed 10/28/93 _ 10/28/93 10/28/93 10/28/93 <br /> Instrument I D # HP 1 HP-1 HP 1 HP-1 <br /> LCS % - - - - �- <br /> Recovery 105 100 105 102 <br /> Control Limits 843-120 8&120 80-120 80-120 <br /> MS/MSD <br /> - _ Batch # _-3100723 - - -- 3100723 3100723 - --3100723 <br />" Date Prepared' 10/28/93'� -�T10/28/93 -10/28/93- W-10/28/93 <br /> Date Analyzed 10/28/93 10/28/93 10/28/93 10/28/93 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 <br /> Matrix Spike <br /> % Recovery 110 105 100 107 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 90 100 100 <br /> Relative % ` <br /> Difference 95 15 00 68 <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 QC limits for MS/MSDs are advisory only <br /> (Schneider <br /> and are not used to accept or re ect batch results <br /> Linda <br /> Project Manager 3100713 BRS <6> <br />