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4 Sequoia <br /> 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> qww Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> EMCON-CP <br /> Project: ARCO 2186,Stockton,CA Sampled: 6/17/99 <br /> 3939 Cambridge Ave Project Number: 21775-237-002 <br /> Cameron Park,CA 95682 Project Manager: Mark Capps Received: 6/18/99 <br /> Reported: 7/l/99 <br /> Total Pt rgeable Hydrocarbons(C6-C12),BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits <br /> y Limit Result Units Notes* <br /> PL.-2(4')(cantinued) <br /> Methyl cert-butyl ether 9060355 6/24/99 6/24/99 5906319-OS 5411 <br /> Surrogate: a,a,a-Trifluorotoluene " 0.0500 ND mg/kg <br /> 60.0-/40 100 <br /> Pure5906319-06 <br /> Hydrocarbons <br /> 9060355 6/24/99 6/24/99 <br /> Benzene 1.00 ND mg/kg <br /> Toluene „ 0.00500 ND " <br /> Ethylbenzene 0.00500 ND " <br /> Xylenes(total) 0.00500 ND " <br /> Methyl ten-butyl ether 0.00500 ND " <br /> Surrogate: a,a,a-Trifluorotoluene " 0.0500 ND <br /> 60.0-140 96.5 % <br /> Pure ge(4') <br /> e 5906319-07 <br /> Hydrocarbons <br /> 9060355SAW <br /> Benzene 6/24/99 6/24/99 1.00 ND mg/kg <br /> ., <br /> Toluene „ 0.00500 ND <br /> Ethylbenzene 0.00500 ND " <br /> Xylenes(total) 0.00500 ND " <br /> Methyl tert-butyl ether 0.00500 ND " <br /> Surrogate: a,a,a-Trifluoro toluene 0.0500 ND " <br /> 60.0-140 <br /> 99.5 <br /> Pure g(4') <br /> e Hydrocarbons S206319-08SAW <br /> 9060355 6/24/99 6/24/99 1.00 ND <br /> Benzene „ mg/kg <br /> Toluene 0.00500 ND " <br /> Ethylbenzene 0.00500 ND " <br /> Xylenes(total) 0.00500 ND " <br /> Methyl tert-butyl ether 0.00500 0.0234 " <br /> " <br /> Surrogate: a,a,a-Trifluorotoluene 0.0500 ND60.0-140 <br /> 99.5 % <br /> Pum geable Hydrocarbons S206319-09 <br /> 9060355 6/24/99 6/24/99 <br /> SAH <br /> Benzene 1.00 ND mg/kg <br /> .� <br /> Toluene „ 0.00500 ND " <br /> Ethylbenzene 0.00500 ND " <br /> Xylenes(total) 0.00500 ND " <br /> Methyl tert-butyl ether 0.00500 ND " <br /> Surrogate: a,a,a-Trifluoro[oluene 0.0500 ND " <br /> 60.0-140 93.5 <br /> Purgeable Hydrocarbons5906319-10 <br /> 9060355 6/24/99 6/24/99 1.00 1.20 mg/kg 3 <br /> Sequoia Analytical-Sacramento <br /> *Refer to end of report for text of notes and definitions. <br /> Page 3 of 14 <br />