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819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> Sequoia (916)921-9600 <br /> 4 FAX(916)921-0100 <br /> ,!D- Analytical www•sequolatabs.corn <br /> Gettler-Ryan-Dublin Project: Chevron 9-0557,Stockton,CA Sampled: 5/17/00 <br /> 6747 Sierra Court,Ste.J Project Number: 386843 Received: 5/22100 <br /> Dublin,CA 94568 Project Manager: Deanna L.Harding Reported: 6/6/00 <br /> Total`Pur eeable-Hydroearbons'(C6=C1.2),=BTEX=and=MTBE=by-DHS=LUST/Quatity_Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> lAnalyte Analyzed Level Result Result Units Recov. Limits % Limit % Nates* <br /> LC5(continued) 0050336-BS1 <br /> Methyl tert-butyl ether 5/30/00 10.0 10.8 ugfl 70.0-130 108 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 10.7 60.0-140 107 <br /> Matrix Spike 0050336-MSI S005326-05 <br /> Benzene 5/30/00 10.0 ND 10.2 ug/1 60.0-140 102 <br /> Toluene It 10.0 ND 10.1 1. 60.0-140 101 <br /> Ethylbenzene to10.0 ND 10.2 It 60.0-140 102 <br /> Xylenes(total) 30.0 ND 30.4 to 60.0-140 101 <br /> Methyl tert-butyl ether to 10.0 ND 10.5 to60.0-140 105 <br /> Surrogate: a,a,a-Triuorotoluene it 10.0 10.5 60.0-140 105 <br /> Matrix Spike Dup 0050336-MSD1 S005326-05 <br /> Benzene 5130100 10.0 ND 10.3 ug/1 60.0-140 103 25.0 0.976 • <br /> Toluene " 10.0 ND 10.2 It 60.0-140 102 25.0 0.985 <br /> £thylbenzene 10.0 ND 10.2 to 60.0-140 102 25.0 0 <br /> Xylenes(total) 30.0 ND 30.5 to60.0-140 102 25.0 0.985 <br /> Methyl tert-butyl ether to 10.0 ND 11.0 to60.0-140 110 25.0 4.65 <br /> Surrogate: a,a,a-Trifluorotoluene 10.0 10.3 of60.0-140 103 <br /> Sequoia Analytical-Sacramento *Refer to end of report for test of notes and definitions. <br /> Page 7 of 8 <br />