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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921-9600 FAX (916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-93-5, Stockton <br /> P O Box 13449 Matrix Soil <br /> Sacramento, CA 95813-3449 <br /> Attention Steve Misner QC Sample Group 3100686-690 Reported Oct 29, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE - Ethyl <br /> Benzene Toluene benzene Xylenes <br /> Method EPA 6020 EPA 8020 EPA 8020 EPA 6020 <br /> Analyst: C Chapman C Chapman C Cnapman 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# LCS102793 LCS102793 LCS102793 LCS102793 <br /> Date Prepared' 10/27/93 10/27/93 10/27/93 10/27/93 <br /> Date Analyzed 10/27/93 10/27/93 10/27/93 10/27/93 , <br /> Instrument I D # HP 1 HP 1 HP-1 HP-1 <br /> -LCS °.G <br /> Recovery 105 100 105 100 <br /> Control Limits 80-120 80-120 80-120 80-120 <br /> MS/MSD <br /> Batch # = ---BLK102793 -- - - BLK1D2793- —BLK102793=BLK102793 - - -- <br />-_�—Date Prepared �-10/27/9310/27/93f` � -10/27/93r'T10/27/93� <br /> Date Analyzed 10/27/93 10/27/93 10/27/93 10/27/93 <br /> Instrument I D # HP-1 HP 1 HP-1 HP-1 <br /> Matrix Spike <br /> % Recovery 110 105- 120 125 <br /> Matrix Spike <br /> is Duplicate % <br /> Recovery 100 100 100 100 <br /> Relative % <br /> Difference 95 49 18 22 <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/MSD s are advisory only <br /> and are not used to accept or reject batch results <br /> Linda C Schneider G <br /> Project Manager 3100686 BRS <2> <br />