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A� 885 Jarvis Drive <br /> (� <br /> U �� u0ia Morgan Hdl CA 95037 <br /> `Y (40 8)776 9600 <br /> o Analytical <br /> FAX(408)782 6308 <br /> www sequmalahs corn <br /> URS Corporation Arco] Project BP Heritage#11191,Stockton,CA MPA I 167 <br /> ( 1 g <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G07 W W-0016 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/10/06 14 48 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 6A30031 -EPA 5030B P/T/EPA 8260E <br /> Blank(6A30031-BLKI) Prepared&Analyzed 01/30/06 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0 50 <br /> Ethanol ND 300 " <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Ethylbenzene ND 050 " <br /> Mcthyl tort-butyl ether ND 050 " <br /> I oluene ND 050 " <br /> Xylenes(total) ND 0 50 <br /> Gasoline Range Organics(C4-C 12) ND 50 " <br /> Ourrogate 12 Dichloroethane-d4 4 05 500 81 60-135 <br /> Laboratory Control Sample(6A30031-SSI) Prepared&Analyzed 01/30/06 <br /> iL,rt Amyl methyl ether 17 7 050 ug/l 163 109 80-115 <br /> Benzene 487 0 50 504 97 65-115 <br /> tert Butyl alcohol 151 20 169 89 75-150 <br /> Di-isopropyl ether 16 4 050 162 101 75-125 <br /> Ethanol 135 300 165 82 70-135 <br /> Ethyl tert-butyl ether 165 0 50 164 101 75-130 <br /> Ethylbenzene 686 050 728 94 75-135 <br /> Methyl test-butyl ether 7 63 0 50 7 84 97 65-125 <br /> Toluene 40 7 050 380 107 85-120 <br /> Xylenes(total) 402 050 408 99 85-125 <br /> Gasoline Range Organics(C4-C12) 405 50 440 92 60-140 <br /> Surrogatc 1 2 Dechloroethane-d4 454 500 _ 91 60-135 <br /> Laboratory Control Sample Dup(6A10031-BSD1) Prepared&Analyzed 01/30/06 <br /> tert-Amyl methyl ether 16 9 050 ug/I 16 3 104 80-115 5 15 <br /> Benzene 5 16 050 504 102 65-115 6 20 <br /> tert-Butyl alcohol 159 20 169 94 75-150 5 25 <br /> Di-tsopropyl ether 16 0 050 162 99 75-125 2 15 <br /> Ethanol 183 300 165 111 70-135 30 35 <br /> Ethyl tert-butyl ether 162 050 16 4 99 75-130 2 25 <br /> Etllylbenzene 6 79 050 728 93 75-135 1 15 <br /> Methyl tert-butyl ether 704 050 784 90 65-125 8 20 <br /> i <br /> Sequoia Analytical- Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight bases <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 10 <br /> i <br />