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` SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> IRt <br /> ar (415) 364-9600 FAX (415) 364-9233 <br /> RESNA Client Project ID 150047 01, Ekholm Property v <br /> .1710 Main Street Matrix Soil <br /> Escalon, CA 95320 <br /> Attention John Lane OC Sample Group 4A40301-6 Reported Jan 25, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst E Cunanan E Cunanan E Cunanan E Cunanan A Nagra <br /> MS/MSD <br /> Batch# 4A41401 4A41401 4A41401 4A41401 4A34901 <br /> Date Prepared 1/13/94 1/13/94 1/13/94 1/13/94 1/11/94 <br /> Date Analyzed 1/13/94 1/13/94 1/13/94 1/13/94 1/11/94 <br /> Instrument I D # GCHP-18 GCHP-18 GCHP 18 GCHP-18 GCHP-4 <br /> Conc Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg 15 mg/kg <br /> Matrix Spike <br /> % Recovery 75 60 85 85 87 <br /> Matrix Spike - <br /> Duplicate% <br /> Recovery 80 80 85 85 87 <br /> Relative% <br /> Difference- 65 29 00 00 00 <br /> LCS Batch# - - _ _ _ <br /> Date Prepared - _ <br /> Date Analyzed - _ _ <br /> Instrument I D # - - <br /> LCS % <br /> Recovery - _ _ _ _ <br /> % Recovery <br /> Control Limits 55-145 47-149 47-155 56-140 38-122 <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 specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> fill 1111 IIILIIII interference,the LCS recovery is to be used to validate the batch <br /> Vickie Ta e <br /> Project Manager 4A40301 WAT <9> <br />