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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 ICS Exxon <br />.1050 Melody Lane Ste 160 Matrix Sod <br /> Roseville, CA 95678 <br /> Attention Paul Graff OC Sample Group 3110860-861 Reported Nov 29, 1993 <br /> QUALITY 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 Chapman C Chapman C Chapman C Chapman C Chapman <br /> MS/MSD <br /> Batch# 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 /> Conic Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 5 0 mg/L <br /> 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 54 1 1 00 <br /> LCS Batch# <br /> Date Prepared <br /> Date Analyzed <br /> Instrument I D # <br /> LCS % j <br /> Recovery <br /> I <br /> Recovery <br /> Control Limits 80 120 80-120 80-120 80-120 90-110 <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 matrix spike is an aliquot of sample <br /> fortified with known quantities of soecific compounds and subjected to the entire anaiytical procedure if <br /> the recovery of analytes trom the matrix spike does not fall within specified control limits due to matrix <br /> J - interference the LCS recovery is to be used to validate the batch <br /> Linda C Schneider <br /> Project Manager <br /> 3110860 AEG <4> <br />