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Sequoia 680 Chesapeake Drive Redwood Gty,CA 94063 (650) 364-9600 FAX(650)364 9233
<br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673
<br /> 11111WAI7a� 1Ca1 819 Sinker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100
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<br /> 0- eider Ryan/Geostrategles AClient Project!D AUnocal SS#5886
<br /> >6747 Sierra Court, Ste J Matra Liquid
<br /> 'Dublin, CA 94568
<br /> "Attention Deanna Harding Work Order# 9803G84-11, 12 Reported
<br /> Apr 15,y 1998:�
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<br /> QUALITY CONTROL DATA REPORT
<br /> Analyte. Benzene Toluene Ethyl Xylenes Gas
<br /> Benzene
<br /> OC Batch#' GCO40398802009A GCO40398802009A GCO40398802009A GCO40398802009A GCO40398802WSA
<br /> Analy Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015M
<br /> Prep. Method. EPA 5030 EPA 5030 EPA 5030 EPA 5030 EPA 5030
<br /> Analyst D Newcomb D Newcomb D Newcomb D Newcomb D Newcomb
<br /> MS/MSD # 8032500 8032500 8032500 8032500 8032500
<br /> Sample Conc N D N D N D N D N D
<br /> Prepared Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98
<br /> Analyzed Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98
<br /> Instrument I D # HP9 HP9 HP9 HP9 HP9
<br /> Conc Spiked 20pg/L 20Pg/L 20pg/L 60pg/L 3501ag/L
<br /> Result 20 21 22 67 350
<br /> MS % Recovery 100 105 110 112 100
<br /> �Dup Result 20 21 21 64 340
<br /> D % Recov 100 105 105 107 97
<br /> RPD 00 00 47 46 29
<br /> RPD Limit 0-20 0-20 0.20 0-20 0-50
<br /> LCS # LCSO40398 LC$040398 LC8040398 LCSO40398 LCSO40398
<br /> Prepared Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98
<br /> Analyzed Date 4/3/98 4/3/98 4/3/98 4/3/98 4/3/98
<br /> Instrument I D # HP9 HP9 HP9 HP9 HP9
<br /> Conc Spiked 20yg/L 20"9/L 20pg/L 60u9/L 350,ug/L
<br /> LCS Result 21 22 22 67 350
<br /> LCS % Recov .. 105 110 110 112 100
<br /> 60-140 60-140 60.140 60-140 60.140
<br /> LCS 70-130 70-130 70-130 70-130 70.130
<br /> Control Limits
<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 /> f=laffregory
<br /> 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 /> P. 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 /> Project Manager '*MSS Matrix Spike,MSD-MS Duplicate,RPD-Relative%Difference 9803G82 GET <12>
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