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Sequoia <br /> 819 Striker Avenue,Suite 8 <br /> Sacramento, CA 95834 <br /> Analytical (916)921-9600 <br /> FAX(916)921-0100 <br /> EMCON-CP <br /> Project: ARCO 21 S6,Stockton,CA Sampled: 6/17/99 <br /> 3939 Cambridge Ave Project Number: 21775-237-002 <br /> Cameron Park,CA 95682Received: 6/18/99 <br /> Project Manager: Mark Capps Reported: 7/1/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A <br /> Sequoia Analytical -Sacramento <br /> Batch Date Date Surrogate Reporting <br /> An Number Prepared Analyzed Limits <br /> Limit esult RUnits Notes* <br /> SW-W(-1$_) <br /> 5906319-01 511 <br /> Tert-butyl alcohol 9060309 6/21/99 6/23/99 <br /> Methyl tert-butyl ether 10.0 ND mg/kg <br /> Di-isopropyl ether 0.100 11.0 " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether <br /> 0.100 ND " <br /> 0.100 ND " <br /> Surrogate: 1,2-DCA-d4 <br /> 60.0-140 80.4 <br /> S W-x(18'1 S906319-02 X411 <br /> Methylthyl tert-butyl ether <br /> Te l alcohol 9060309 6/21/99 6/23/99 10.0 ND mg/kg <br /> Di-isopropyl ether 0.100 0.447 " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> 0.100 ND " <br /> Surrogate.• !,2-DCA-d4 <br /> 60.0-14078.8 % <br /> SW S(18') S906319-03 SA <br /> Tert-butyl alcohol 9060309 6/21/99 6/23/99 <br /> Methyl tert-butyl ether 10.0 ND mg/kg <br /> Di-isopropyl ether 0.100 0.221 " <br /> Ethyl tert-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> 0.100 ND " <br /> Surrogate. !,2-DCA-d4 60.0-14080.8 % <br /> SW N(1g) S906319-04 mil <br /> Tert-butyl alcohol 9060309 6/21/99 6/24/99 <br /> Methyl tert-butyl ether 20.0 ND mg/kg D <br /> „ „ <br /> Di-isopropyl ether 0.200 23.8 D <br /> Ethyl tert-butyl ether 0.200 ND " D <br /> Tert-amyl methyl ether 0.200 ND " D <br /> 0.200 ND D <br /> Surrogate: 1,2-DCA-d4 " 60.0-1400 <br /> 89.6 / D <br /> PL 2 f4 1 S206319-05 mil <br /> Tert-butyl alcohol 9060309 6/21/99 6/23/99 <br /> Methyl tert-butyl ether „ 10.0 ND mg/kg <br /> Di-isopropyl ether 0.100 ND " <br /> Ethyl tent-butyl ether 0.100 ND " <br /> Tert-amyl methyl ether 0.100 ND " <br /> 0.100 ND " <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 7 of 14 <br />