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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 Water <br /> Sacramento, CA 95813-3449 _ <br /> Attention Steve Misner OC Sample Group 401-0303 Reported Jan 21, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- Organic <br /> Benzene Toluene Benzene Xylenes Lead <br /> Method EPA 602 EPA 602 EPA 602 EPA 602 LUFT <br /> Analyst' Chiaravailati Chiaravailoti Chiaravailoti Chiaravalloti S Foster <br /> Concentration <br /> Spiked 10 ug/L 10 ug/L 10 ug/L 30 ug/L 0 50 mg/kg <br /> LCS Batch#• LCS011994 LCS011994 LCS011994 LCS011994 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 I D # 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 13LK011994 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 /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> '1 preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> //C�"��f/�/G validation of sample batch results Due to matrix effects,the QC limits for MS/MSD's are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> 4010303 BAS <3> <br />