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Sequoia 680 Chesapeake Drive Redwood City,CA 94663 (415) 364 9600 FAX(415) 364 9233
<br /> 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686 9600 FAX(510) 686 9689
<br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100
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<br /> r,RESNA Client Project ID' OW0290 01, BJJ Stockton
<br /> , 1710 Main Street Matrix Liquid
<br /> �'Escalon, CA 95320 v
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<br /> Attention Lois Frantz QC Sample Group 4D95801 Reported Apr 29, 1994
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<br /> QUALITY CONTROL DATA REPORT
<br /> ANALYTE Benzene Toluene Ethyl Xyienes
<br /> Benzene
<br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020
<br /> Analyst J Fontcha J Fontcha J Fontcha J Fontcha
<br /> MS/MSD
<br /> Batch#. 4040888 4040888 4040888 4040688
<br /> Date Prepared: 4/22/94 4/22/94 4/22/94 4/22/94
<br /> Date Analyzed: 4/22/94 4/22/94 4/22/94 4/22/94
<br /> Instrument I.D#-. GCHP-2 GCHP-2 GCHP-2 GCHP-2
<br /> Cone.Spiked: 20Ng/L 20a9/L 20u9/L 60N9/L
<br /> Matrix Spike
<br /> %Recovery: 95 95 95 98
<br /> Matrix Spike
<br /> Duplicate%
<br /> Recovery: 95 95 95 98
<br /> Relative%
<br /> Difference. 00 00 00 00
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<br /> LCS Batch#. LCSO42294 LCSO42294 LCSO42294 LCSO42294
<br /> Date Prepared: 4/22/94 4/22/94 4/22/94 4/22/94
<br /> Date Analyzed: 4/22/94 4/22/94 4/22/94 4/22/94
<br /> Instrument I.D.#: GCHP-2 GCHP-2 GCHP-2 GCHP-2
<br /> LCS%
<br /> Recovery: 100 99 100 102
<br /> 5R.-Recovery
<br /> Control Limits: 71-133 72-128 72-130 71 120
<br /> Please Note
<br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents,
<br /> LAP #1271 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 /> interference,the LCS recovery Is to be used to validate the batch
<br /> Vickie Tague Clark
<br /> Project Manager 4D95801 WAT <2>
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