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4:1)- Sequoia 819 Striker Avenue, Suite 8 <br /> Sacramento, CA 95834 <br /> Analytical (916)921-9600 <br /> FAX(916) 92 1-0100 <br /> EMCON-CP <br /> Project: ARCO 2180,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 Purgeable Hydrocarbons(C6-02),BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> [Analyte Number Prepared Analyzed Limits <br /> Limit Result Units Notes* <br /> PurgeableHydrocarbons5906319-01 SAW <br /> Benzene <br /> 9060355 6/24/99 6/24/99 100 1840 mg/kg 1 D <br /> „ <br /> Toluene 0.500 ND " D <br /> Ethylbenzene „ 0.500 ND " D <br /> Xylenes(total) 0.500 1.21 D <br /> Methyl tert-butyl ether 0.500 42.1 D <br /> Surrogate: a,a,a-Tris luorotoluene 5.00 8.03 D <br /> 60.0-14093.5 a <br /> Purges ab a Hydrocarbons 5906319-02 <br /> 9060355 6/24/99 6/24/99 <br /> SO <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 0.0142 " <br /> Surrogate: a,a,a-Tiuorotoluene 0.0500 1.83 " <br /> „ <br /> 60.0-140 98.0 <br /> e <br /> PurgSable Hydrocarbons 5906319-03 <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 ND " <br /> Surrogate: a,a,a-Tris luorotoluene 0.0500 0.131 " <br /> 60.0-140 98.5 <br /> Purgeable 5906319-04 <br /> 9060355 6/24/99 <br /> Benzene 6/24/99 50.0 364 mg/kg 2,D <br /> Toluene „ 0.250 0.545 D <br /> Ethylbenzene 0.250 7.71 D <br /> Xylenes(total) 0.250 3.97 D <br /> Methyl tert-butyl ether 0.250 24,0 D <br /> Surrogate: a,a,a=TriJluorotoluene 2'50 37.0 " D <br /> „ <br /> 60.0-140 101 <br /> PurPL-2 <br /> g b'Hydrocarbons S906319-05 <br /> )060355 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 /> 0.00500 ND " <br /> Sequoia Analytical-Sacramento <br /> *Refer to end of report for text of notes and definitions. <br /> Q Page 2 of 14 <br />