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' Sequoia 6a0 ch-mpeake D&- fAX( <br /> tr;dwooa Cry CA 94063 (650)360-9600 FAX(650)364 988 9233 <br /> 404 N WgN Lam Walnut Geek.G 94598 (925)988-9600 925)988-9673 <br /> Analytical 6195e1kerAvenue.Suite a Sacramento CA 95834' (9t6)92t-9600 fAX(916)921-0100 <br /> 1455 McDowell Blvd.Nord%Ste.D Petaturrw G 94954 (707)792-1865 FAX(707)792-0342 <br /> Ge er-Ryan-'Du 1n lent ro ect D no SS#29,6tockton <br /> 6747 Sierra Court.Suite J Matrix: Liquid <br /> Dublin,CA 94568 <br /> Attention. Deanna Harding QC Sample Group 9020606-619 Reported Feb 11, 1999 <br /> ' QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes MTBE Dissolved Organic <br /> ' Benzene mon <br /> Method: EPA 8024 EPA 6020 EPA 8020 EPA 8020 EPA 8260 EPA 4151 <br /> Analyst: C Westwater C.Westwater C Westwater C Westwater N Nelson <br /> MS/MSD <br /> Batch#: 9024611 9020611 9020611 9024611 9020610 BLK020999 <br /> ' Date Prepared: 2/6/99 2/6/99 2/6/99 2/6/99 2/9/99 2/9/99 <br /> Date Analyzed: 2/6/99 2/6/99 2/8/99 2/6/99 2/9/99 2/9/99 <br /> Instrument I.D.#: HP-2 HP-2 HP 2 HP-2 GC/MS-2 <br /> Conc.Spiked 20pg/L 20pg/L 20ug/L 60pg/L 50pg/L 100 mg/L <br /> ' Matrix Spike <br /> %Recovery: 90 90 95 103 124 115 <br /> ' Matrix Spike <br /> Duplicate°.6 <br /> Recovery: 90 90 95 103 130 103 <br /> Relative% <br /> Difference. Do 40 04 00 0-7 11 <br /> LCS Batch#. 2LCS02W99 2LCS02DB99 2LCS020699 2LCS020699 LC6020999 LCS020999 <br /> Date Prepared. 2/6/99 2/6/99 2/6/99 2/6/99 2/9/99 2/9/99 <br /> Date Analyzed. 2/6/99 2/6/99 2/6/99 2/6/99 2/9/99 2/9/99 <br /> Instrument l.D.#. HP-2 HP-2 HP 2 HP-2 GC/MS-2 <br /> ' LCS% <br /> Recovery: 90 90 90 100 108 102 <br /> Recovery <br /> ' Control Limits: 70-130 70-130 70.130 70-130 70-130 80.120 <br /> Please Note <br /> ' The LCS is a control sample of known.Interferent free matrix that is analyzed using the same reagents, <br /> SEQDOiA ANALYTICAL,#1271 preparation,and analytical methods employed for the samples The matrix spike Is an aliquot of sample <br /> &,f 1624 fortified with known quantities of spedlIc compounds and subjected to the erdlrs analytical procedure It <br /> the recovery of analytes from the matrix spine does not fall wfthln specified control limlb due to matrix <br /> ' interference,the LCS recwm 13 to be used to validate the batch <br /> Janne Fegiey <br /> roject Manager <br /> 90206W GET <27> <br />