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4 SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 + Sacramento, CA 95834 <br /> (916) 921-9600 + FAX (916) 921-0100 <br /> Ooseville�CA <br /> frrrr.J1'. Y{ r graWClientProject YD rshell,141 N EI Dorado,Stockton,CA <br /> 50MelyLane, Ste 160 Matrix Air <br /> 95678 <br /> Attention Paul Graff QC Sample Group 40"115 Reported Apr 8, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 6020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: D Ballard D Ballard D Ballard D Ballard <br /> Concentration <br /> Spiked. 2 0 mg/ms 2 0 mg/ml 2 0 mg/m' 6 0 mg/ml <br /> LCS Batch# BLK040694 13LK040694 BLK040694 BLK040694 <br /> Date Prepared 4/6/94 4/6/94 4/6/94 4/6/94 <br /> Date Analyzed. 4/6/94 4/6/94 4/6/94 4/6/94 <br /> Instrument I.D.# HP-2 HP 2 HP-2 HP-2 <br /> LCS % <br /> Recovery 84 83 66 83 <br /> Control Limits 75-125 75-125 75-125 75-125 <br /> MS/MSD <br /> Batch# BLK040694 BLK040694 BLK040694 BLKG40694 <br /> Date Prepared 4/6/94 4/6/94 4/6/94 4/6/94 <br /> Date Analyzed: 4/6/94 4/8/94 4/6/94 4/6/94 <br /> Instrument I.D # HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery- 84 83 86 83 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 96 99 100 <br /> Relative % <br /> Difference. 17 is 14 19 <br /> SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known interterent free matrix that is analyzed using the same reagents <br /> preparation and anaiytical methods employed for the samples The LCS%recoverydata is used for <br /> //��Gt vaiidat�on of sample batch results Due to matrix 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 <br /> 4048115 FUG <3> <br />