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SEQUOIA ANALYTICAL <br /> $19 Striker Avenue Suite 8 • Sacramento CA 95834 <br /> . (916) 921-9600 • FAX (916) 921 0100 <br /> Brown &Caldwell Client Project ID Arco 434-94-5 Lodi <br /> P O Box 13449 Matrix Air <br /> Sacramento, CA 95813-3449 <br /> Attention Mindy Wright QC Samole Group 4010044-045 Reported Jan 14 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst JF JF JF JF <br /> Concentration <br /> Spiked 20ug/L 20 ug/L 20 ug/L 60 kg/L <br /> LCS Batch# 3LCS0101594 3LCS0101594 3LCS0101594 3LCS0101594 <br /> Date Prepared 1/5/94 1/5/94 1/5/94 1/5/94 <br /> Date Analyzed 1/5/94 1/5/94 1/5/94 1/5/94 <br /> Instrument 1 D # HP 5 HP 5 HP 5 HP 5 <br /> LCS % <br /> Recovery- 101 98 92 93 <br /> Control Limits- 71 133 72-128 72 130 71-120 <br /> MS/MSD <br /> Batch #: 0101594 0101594 0101594 0101594 <br /> Date Prepared: 1/5/94 1/5/94 1/5/94 1/5/94 <br /> Date Analyzed 1/5/94 1/5/94 1/5/94 1/5/94 <br /> Instrument 1 D # HP-5 HP 5 HP 5 HP-5 <br /> Matrix Spike <br /> % Recovery. 105 100 90 93 <br /> Matnx Spike <br /> Duplicate % <br /> Recovery: 105 105 100 100 <br /> Relative % <br /> Difference- 00 49 11 73 <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 /> preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> validation of sample batch results Due to matnx effects,the QC limits for MS/MSD's are advisory only <br /> nda C Schneider and are not used to accept or reject batch results <br /> Project Manager 4010044 BRS <2> <br />