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885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> �E ll (408)776 9600 <br /> mE <br /> FAX(408)792 6308 <br /> Anal fic a l <br /> e: r www sequocale6s corn <br /> URS Corporation[Arco I] Project BP Heritage#11194,Tracy,CA MPA1469 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G07WZ-0011 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 02/13/06 15 39 <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 6BO7008-EPA 5030B PIT 1 EPA 8260B <br /> Matrix Spike(6B07008-MSI) Source MPA1461-09 Prepared 02/07/06 Analyzed 02/08/06 <br /> Toluene 203 2 5 ug/l 190 36 105 85-120 <br /> Xylenes(total) 206 25 204 86 97 85-125 <br /> Gasoline Mange Organics(C4-C 12) 2470 250 2200 650 83 60 140 <br /> Surrogate l 2-Dtchloroethane-d4 471 500 94 60-135 <br /> Matrix Spike Dup(6B07008-MSD1) Source NIPA1461-09 Prepared 02/07/06 Analyzed 02/08/06 _ <br /> tert-Amyl methyl ether 798 25 ugll 816 ND 98 80 115 3 15 <br /> Benzene 333 25 252 12 85 65-115 3 20 <br /> tert-Butyl alcohol 1050 100 844 280 91 75-120 2 25 <br /> Di isopropyl ether 752 25 812 ND 93 75-125 3 15 <br /> Ethanol 883 1500 824 ND 107 70-135 3 35 <br /> Ethyl tert butyl ether 750 25 820 ND 91 75-130 3 25 <br /> Whylbenzene 366 25 364 3 4 91 75-135 2 15 <br /> ethyl tert butyl ether 103 2 5 392 72 79 65-125 l 20 <br /> Toluene 202 25 190 3 6 104 85-120 0 5 20 <br /> Xylenes(total) 211 2 5 204 86 99 85 125 2 20 <br /> Gasoline Range Organics(C4-C12) 2330 250 2200 650 76 60-140 6 25 <br /> Surrogate 1 2-Dichloroethane-d4 449 500 90 60435 <br /> Batch 6BO9004-EPA 5030B P/T/EPA 8260B <br /> Blank(6B09004-BLKI) Prepared&Analyzed 02/09/06 <br /> tert-Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 050 " <br /> Ethanol ND 300 <br /> Ethyl tert butyl ether ND 050 " <br /> Ethylbenzene ND 050 <br /> Methyl tert butyl ether ND 050 " <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-Cl2) ND 50 <br /> Surrogate 12 Dtchloroethane d4 455 goo 91 60-135 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed to 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 to its entirety <br /> Page 7 of 10 <br />