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Sequoia 819 Striker Avenue, Suite 8 <br /> Sacramento,CA 95834 <br /> VAffAnalytical (716)921-9100 <br /> fAX(916)921-0100 <br /> EMCON-CP Project: ARCO 2186,Stockton,CA Sampled: 6/17/99 <br /> 3939 Cambridge Ave Project Number: 21775-237-002 Received: 6/18/99 <br /> Cameron Park,CA 95682 Project Manager Mark Ca s Reported: 7/1/99 <br /> Total.Purgeable Hyq-ocarbons(C'6-C12);;BTFX anci:MTBE by.DHS'LUFT./Qd' Hty Control° .� <br /> Sequoia,Aztalytical Sacramento,:, h }, <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> &Ichm 9060355 Date PreparedL-&24/99 Exinuligil Method, EPA 5020D(MeOlb <br /> BISnk 9060355-BI.K1 <br /> Purgeabie Hydrocarbons 6/24/99 NO mg/kg 1.00 <br /> Benzene NO 0.00500 <br /> Toluene N17 0.00500 <br /> Ethylbenzene N17 0.00500 <br /> Xylenes(total) N <br /> Methyl tenq 0.00500 <br /> tent-butyl ether <br /> Surrogate a,a,a-Trifluorotoluene <br /> 0.200 0. NO 00 <br /> N 60.0-140 0 97.5 <br /> L� 906QZ55-BSI <br /> Benzene 6/24/99 0.200 0.208 m /k <br /> Toluene g 8 70:0-130 104. <br /> 6.200 0.224 70.0-130 112 <br /> Ethylbenzene 0200 0.224 70.0-130 112 <br /> Xylenes(total) 0.600 0.600 70.0-130 100 <br /> Methyl Cert-butyl ether 0.200 0.198 .70.0-130 99.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.100 0.106 60.0-140 103 <br /> 1Y1,trix;5 9060355_IvrSt $A�6319-05 <br /> Benzene 6/24199 0.200 ND 0.169 mg/kg <br /> Toluene „ 0 200 ND 0 184 g g 60.0-140 84.5 <br /> Ethylbenzene 60.0-140 92.0 <br /> 0.200 ND 0.186 60.0-I40 43.0 <br /> Xylenes(total) 0.600 ND 0.516 " <br /> Methyl tert-butyl ether60.0-140 86.0 <br /> 0.200 ND 0.178 60.0-140 89.0 <br /> Surrogate: a,a,a-Trifluorotoluene 0.100 0.202 <br /> 60.0-140 101 <br /> Il7itrix Spikr Dlip <br /> 9060.355-MS-Q.1 590 6319-0 S <br /> Toluene <br /> Toluene 6/24199 0.200 ND 0.168 mg/kg 60.0-140 84.0 25.0 0.593 <br /> 0.200 ND 0.174 " <br /> Ethylbenzene 0.200 ND 0.186 60.0-140 87.0 25.0 5.59 Xylenes.(total) 0.600 ND 0.514 60.0-140 93.0 25.0 0 <br /> " <br /> Methyl cert-butyl ether 0.200 ND 0.176 60.0-140 85.7 25.0 0.349'Surrogate: a.a,a-Truorotoluene 0.200 . 0. 60.0-140 88.0 25.0 1.13 <br /> 106 " 60.0_140 103 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page I I of 14 <br />