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885 Jarvis Drive <br /> quoia Morgan Hilt CA 95037 <br /> (408)7769600 <br /> alytical FAX(409)782 6308 <br /> www sequoialabs com <br /> ton[Arco II Project BP Heritage#11191,Stockton,CA MOE0611 <br /> vateway OakS Dr,Ste 300 Project Number G07WW-0016 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 05/31/05 18 39 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reponmg Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit ]Votes <br /> Batch 5E23025-EPA 5030B P/T/EPA 8260B <br /> Blank(5E23025-BLKI) Prepared&Analyzed 05/23/05 <br /> tent-Amyl methyl ether ND 050 ug/t <br /> Benzene ND 050 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0 50 " <br /> Ethanol ND 100 " <br /> Ethyl tert-butyl ether ND 050 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tert-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-Cl2) ND 50 " <br /> •Surrogate 1 1-Dichloroethane-d4 215 250 86 60-135 <br /> Laboratoryy Control Sample(5E23025-BSI) Prepared&Analyzed 05/23/05 <br /> tert-Amyl methyl ether 110 050 ~ ug/t 100 110 80-115 <br /> Benzene 9 47 050 100 95 65-115 <br /> tert-Butyl alcohol 518 20 500 104 75-150 <br /> Di-isopropyl ether 108 050 100 108 75-125 <br /> Ethanol 237 100 200 118 70-135 <br /> Ethyl ten-butyl ether 105 0 50 100 105 75-130 <br /> Ethylbenzene 9 84 0 50 100 98 75-135 <br /> Methyl tent-butyl ether 9 63 050 100 96 65-125 <br /> Toluene 991 050 100 99 85-120 <br /> Xylenes(total) 301 0 50 300 100 85-125 <br /> Surrogate I2-Dichloroethane-d4 218 150 87 60-135 <br /> Laboratory Control Sample(5E23025-BS2) Prepared&Analyzed 05/23/05 <br /> Benzene 5 15 050 ug/l 608 85 65-115 <br /> Ethylbenzene 7 91 0 50 7 84 101 75-135 <br /> Methyl cert-butyl ether 7 73 0 50 9 60 81 65-125 <br /> Toluene 308 0 50 329 94 85-120 <br /> Xylenes(total) 388 0 50 38 5 101 85-125 <br /> Gasoline Range Organics(C4-C12) 428 50 440 97 70-124 <br /> Surrogate 12-Dichloroethane-d4 205 250 82 60-135 <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 basis <br /> This analytical report must be reproduced in its entirety <br /> Page 7 of 9 <br />