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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233
<br /> 404 N Wlget Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673
<br /> Analytical 819 Striker Avenue,5ulte 8 Sacramento,CA 95834` (916)921-9600 FAX(916)921-0100
<br /> 1455 McDowell Blvd North,Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342
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<br /> Getter-pj n-DLibliri "` " ��"Cli+eni
<br />' 6747 Sierra Court, Suite J Matmt Liquid y
<br /> Dubiln, CA 94568 ;Y
<br /> Attention Deanna Harding DC Sample Grotap 902Q651-668 Reported Feb 16, 1999u
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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. C Westwater C Westwater C Westwater C Westwater
<br />' MS/MSD
<br /> Batch#: 9020225 9020225 9020225 9020225
<br /> Date Prepared- 2/10/99 2/10/99 2/10/99 2/10/99
<br /> Date Analyzed: 2/10/99 2/10/-99 2/10/99 2/10/99
<br /> Instrument LD #: HP-5 HP-5 HP-5 HP-5
<br />' Conc. Spiked: 20pg/L 20pg/L 20ug/L 60jug/L
<br /> Matrix Spike
<br /> % Recovery: 90 95 95 97
<br /> MMatrix Spike
<br /> Duplicate%
<br /> Recovery- 95 95 95 100
<br /> Relative%
<br /> Difference: 5 4 00 0 0 34
<br /> +xo�r v.•tr cow}pro wtar.,..,v c.v...,,.`..+,A.Ah..r,w.,'.o-..t r.�:r.,,.,..,...J...�.,+w.;:.s,...,v,.,... K rho .,. ,,. X:...+. ...,.,,x,..r..w..wv.cw.....v..w..,,+.Jor .,..,,�.,....v.,.Y>.wv,.,, .,.,.c,r cos....+few....vw.....,,k ~.,,..,,
<br /> LCS Batch#: SLCS021099 51-CS021099 SLCS021099 SLCS021099
<br />' Date Prepared: 2/10/99 2/10/99 2/10/99 2/10/99
<br /> Date Analyzed. 2/10/99 2/10/99 2/10/99 2/10/99
<br /> Instrument LD #: HP-5 HP-5 HP-5 HP-5
<br />' LCS %
<br /> Recovery: 95 100 100 102
<br />' Recovery
<br /> Control Limits: 70-130 70-130 70-130 70-130
<br />' Please Note
<br /> The LCS is a control sample of known,Interferent free matrix that is analyzed using the same reagents,
<br /> SEQUOIA
<br /> ANALYTICAL,#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 /> jullan4ne*'Fegley
<br /> interference,the LCS recovey is to be used to validate the batch
<br />' Project Manager
<br /> 9020651 GST -e-23>
<br /> .Qc
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