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SEQUOIA ANALYTICAL
<br /> 680 Chesapeake Drive • Redwood City, CA 94063
<br /> (415) 364-9600 FAX (415) 364-9233
<br /> ,�RESNA Client Project ID 150002 00, Laidlaw 4;
<br /> i 710 Maln Street Matriac- Water
<br /> Escaion, CA 95320
<br /> Kttentio
<br /> Sfin .lohn Lane OC Samie Group 3K85801� Reported Nov 24, 1993
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<br /> QUALITY CONTROL DATA REPORT
<br /> ANALYTE Benzene Toluene Ethyl Xylenes
<br /> Benzene
<br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020
<br /> Analyst: J Dinsay J Dinsay J Unsay J Chnsa
<br /> MS/MSD
<br /> Batch#: 3111457 3111457 3111457 3111457
<br /> Date Prepared: 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
<br /> Instrument I.D.#: GCML#2 GCML#2 GCML#2 GCML#2
<br /> Conc.Spiked: 20ug/L 20pg/L 20pg/L 60pg/L
<br /> Matrix Spike
<br /> %Recovery: 100 100 110 i t i
<br /> Matrix Spike
<br /> Duplicate%
<br /> Recovery: 99 100 109 los
<br /> Relative%
<br /> Difference: 10 00 091 is
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<br /> LCS Batch#: GBLK112293 GBLK112293 GBLK112293 GBLK112293
<br /> Date Prepared: 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
<br /> Instrument I.D.#: GCML#2 GCML#2 GCML#2 GCML#2
<br /> LCS %
<br /> Recovery: 104 100 los 104
<br /> %Recovery
<br /> Control Limits: 79130 7x130 70-130 70-130
<br /> Please Mote
<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 /> fortrfied with known quantiles 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 /> interference,the LCS recovery is to be used to validate the hatch
<br /> Vickie Tague
<br /> Project Manager 3K85801 WAT <2>
<br />
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