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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 Solt <br /> Sacramento, CA 95813-3449 <br /> Attention Steve Misner OC Sample Group 3100736-739 Reported Nov 4, 1993 <br /> QUALITY CONTROL DATA REPORT <br /> =" <br /> ___-[ANALYTE_ - _ Ethyl STLC <br /> Benzene Toluene benzene Xylenes Lead <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 5010 <br /> Analyst C C�cr^a C C.apmai, C Cndpruan C Chapman 5 Foster <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 0 50 mg/L _ <br /> LCS Batch# LCS102993 LCS102993 LCS102993 LCS102993 LCS110193 <br /> s = <br /> Date Prepared s 10/29/93 10/29/93 10/29/93 10/29/93 11/1/93 <br /> _ Date Analyzed 10/29/93, 10/29/93 _ 10/29/93 10/29/93 11/1/93 <br /> Instrument I D # HP-1 HP-1 HP 1 HP-1 PE-40 <br /> z _ LCS % - _ _ _ _ _ - ,t - a � _ <br /> n Recovery 110 100 110 107 87 <br /> Control Limits 80-120 80-120 60.120 80-120 80-120 <br /> MS/MSD <br /> Batch # ' 3101053======----3101053 3101053 3101053 3100739 <br /> - <br /> --DatePrepared 10/29/93_"- 10/2g/93�-�10/29/93- 10/29/93TT� ~11/1/93 <br /> Date Analyzed. 10/29/93 10/29/93 10/29/93 10/29/93 11/1/93 <br /> Instrument I D # HP-1 HP-1 HP-1 HP-1 PE-40 <br /> Matrix Spike <br /> % Recovery 105 95 105 102 95 <br /> Matrix Spike <br /> _ Duplicate% <br /> Recovery 110 100 110 107 90 <br /> Relative % <br /> Difference 4 6 51 4 6 4 8 54 <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 <br /> Project Manager 3100736 SRS <3> <br /> r <br />