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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 • Sacramento, CA 95834 <br /> (916) 921 9600 • FAX (916) 921-0100 <br /> Aegis Environmental Consultants Client Project ID Exxon <br /> WMelody Lane, Ste 160 Matrix Soil <br /> ville, CA 95678 <br /> Attention Paul Graff CC Sample Group 3110860-861 Reported Nov 29, 1993 <br /> OUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes STLC Lead <br /> benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C Chaoman C Chapman C Chapman C Chapman C Chapman <br /> MS/MSD <br /> IBatch# 3110483 3110483 3110483 3110483 3110483 <br /> Date Prepared. 11/22/93 11/22/93 11/22/93 11/22/93 11/22/93 <br /> Date Analyzed 11/22/93 11/22/93 11/22/93 11/22/93 11/22/93 <br /> Instrument I D #- HP-1 HP 1 HP-1 HP-1 HP-1 <br /> Conc. Spiked: 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 5 0 mg/L <br /> I Matrix Spike <br /> % Recovery 95 90 95 88 93 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 90 90 87 93 <br /> Relative % <br /> Difference 00 00 5 4 1 1 00 <br /> I <br /> LCS Batch#• - <br /> Date Prepared - <br /> Date Analyzed. <br /> Instrument I D #- <br /> LCS % <br /> Recovery - - - <br /> I % Recovery <br /> Control Limits- 80-120 80-120 80-120 80-120 90-110 <br /> IPlease Note <br /> The LCS is a control sample of known interferent free matrix that is analyzed using the same reagents <br /> I SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure it <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> `— - - - <br /> lrlda C Schneider interference the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 3110860 AEG <4> <br />