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{ rI <br /> Sequoia 885 Jarvis Drive <br /> 95037 <br /> IIW Analytical Morgan 408 77 -9600 <br /> (40B)776-9600 <br /> FAX(468)782-6308 <br /> www.scquoialabs.com <br /> F <br /> orporation[Arco]] Project:ARCO#2168,Stockton,CAateway Oaks Dr.,Ste 300 MOK0822 <br /> Project Number:GOC81-0010 <br /> acramento CA,95833 Reported: <br /> Project Manager:Vernon P.Elarth <br /> - 11/28/05 I6:55 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> r <br /> Analyte Reporting Spike source %REC <br /> Result Limit Units Level Result %REC Limits RPD RPD <br /> Notes <br /> Batch SK22027-EPA 503OB15035A McOH/EPA 8260B <br /> Laboratory Control Sample Dup(5K22027-BSD]) <br /> Prepared: I1/22/05 Analyzed. 11/23/05 <br /> tert-Amyl methyl ether 0.566 <br /> 0.025 mg/kg 0.564 <br /> Benzene 100 80-130 1 25 <br /> 0.176 O,p50 �� , <br /> tert-Butyl alcohol 0.194 91 65-125 0.6 20 <br /> 7.13 5.0 5.37 133 80-165 <br /> Di-isopropyE ether 9 25 <br /> 0.525 0.025 0.567 93 85-115 0 <br /> 1,2-Dibromoethane(EDB) 0.636 0.025 ,2 20 1,2-Dichloroethan0.558 114 85-130 3 15e 0.601 0.025 " <br /> 0.552 109 63-124 0.7 25 <br /> Ethanol 5.67 10 <br /> Ethyl tent-butyl ether 5,31 107 35-150 1 40 <br /> 0.541 0.025 <br /> Ethylbenzene 0.564 96 80-125 0.7 25 <br /> 0.255 0.050 " <br /> 0.283 90 80-135 5 20 <br /> Methyl tert-butyl ether 0,267 0.025 " <br /> Toluene 1.32 0.050 <br /> 0.263 102 75-115 1 35 <br /> " <br /> „ <br /> Xylenes(total) 1.48 0.050 1.39 95 85-125 0 15 <br /> I.55 95 80-140 1 20 <br /> Gasoline Range Organics(C4-C 12) 15.2 2 5 t <br /> 16.5 92 60-140 0.7 25 <br /> Surrogate:1,2-Dichloroethane-d4 0.00597 <br /> 0.00500 119 60-125 <br /> I <br /> I' <br /> s <br /> I <br /> a t <br /> s <br /> 4 <br /> Sequoia Analytical-Morgan Hill The results in this toe samples analyzedreP ort apply thlin accordance with the chain of <br /> custody document.Unless otherwise stated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety, <br /> � I <br /> Page 8 of 9 <br />