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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> X9161 921 9600 FAX (916) 921 0100 <br /> Brown & Caldwell Client Project ID Arco 2133-93-5 Stockton <br /> P O Box 13449 Matrix Water <br /> Sacramento CA 95813-3449 <br /> Attention Steve Misner CSC Sample Group 401-0303 Peaorted Jan 21 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Organic <br /> Benzene Toluene Benzene Xvlenes Lead <br /> Method EPA 602 BPA 602 EPA 602 EPA 602 LUFr <br /> Analyst: Chiaravailoti Chiaravaiicti Chiaravailoti Ch4aravailoti S Foster <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L �0 ug/L 30 ug/L 0 50 mg/kg <br /> LCS Batch# LCSO11994 LCS011994 LCS011994 LCSO11994 LCS011394 <br /> Date Prepared: 1/19/94 1/19/94 1/19/94 1/19/94 1/13/94 <br /> Date Analyzed. 1/19/94 1/19/94 1/19/94 1/19/94 1/13/94 <br /> Instrument LD #• HP-2 HP-2 HP 2 HP 2 SH-1000 <br /> LCS % <br /> Recovery: 106 106 106 106 87 <br /> Control Limits* 80-120 80-120 80.120 80-120 80.120 <br /> MS%MSD <br /> Batch #: BLK011994 BLK011994 BLK011994 BLK011994 4010303 <br /> Date Prepared, 1/19/94 1/19/94 1/19/94 1/19/94 1/13/94 <br /> Date Analyzed: 1/19/94 1/19/94 1/19/94 1/19/94 1/13/94 <br /> Instrument I D #• HP-2 HP-2 HP-2 HP-2 SH-1000 <br /> Matrix Spike <br /> % Recovery 110 100 110 107 96 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery* 100 100 100 93 94 <br /> Relative% <br /> Difference: 95 00 95 14 21 <br /> SEQUOIA ANALYTICAL Please Note <br /> 7 The LCS is a control sample of known interferent free matrix that is analyzed using the same reagen <br /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> ��-(, /,/G` ' ����u� validation of sample batch resuits Due to matrix effects the QC limits for MS/MSUS are advisory only <br /> / Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 4010303 SRS <3> <br />