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' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233
<br /> 404 N Wlget Lara Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673
<br />' 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100
<br /> �,�► Analytical
<br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342
<br /> �x£�3�°".'�.t�r
<br /> Get>'er-�iyan bu n'— °` "wClient Project 10 Unocal S8#0187, Stockton
<br /> 116747 Sierra Court, Suite J Matrix Liquid
<br /> Dublin, CA 94568
<br /> �Attentlon Deanna Harding QC Sample Group 9020651-668 Reported Feb 16, 1999 'r
<br /> QUALITY CONTROL DATA REPORT
<br /> ANALYTS 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#: 9020422 9020422 9020422 9020422
<br />' Date Prepared: 2/11/99 2/11/99 2/11/99 2/11/9,9
<br /> Date Analyzed: 2/11/99 2/11/99 2/11/99 2/11/99
<br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2
<br />' Conc. Spiked: 20,ug/L 20,ug/L 20ug/L 60pg/L
<br /> Matrix Spike
<br /> °.6 Recovery, too ss iaa 107
<br /> Matrix Spike
<br /> Duplicate %
<br />' Recovery: 100 95 95 108
<br /> Relative %
<br />' w Difference: 00 00 51 16
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<br />' LCS Batch#: 2LCS021199 2LCS021199 2LCS021199 2LCS021199
<br />' Date Prepared. 2/11/99 2/11/99 2/11/99 2/11/99
<br /> Date Analyzed: 2/11/99 2/11/99 2/11/99 2/11/99
<br /> Instrument I.D #: HP-2 HP-2 HP-2 HP-2
<br />' LCS %
<br /> Recovery: 100 95 100 1108
<br />' ° Recovery
<br /> Control Limits: 70-130 70-130 70-190 7x130
<br />' Please Note
<br /> The LCS Is a control sample of known,Interferent free matrix that is analyzed using the same reagents,
<br /> 611Q,nne
<br /> UOIA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike]s 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 recoveryIs to be used to validate the batch
<br /> Fegley
<br />' Project Manager
<br /> 5020651 GET 124
<br />
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