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!"'�" . 885 Jarvis Drive <br /> Sequoia Morgan Hill CA 95037 <br /> Analytical (408)776 00 <br /> FAX 63 <br /> (448}782 6308 <br /> www sequoialabs com <br /> URS Corporation[Areol] Project BP Heritage#11194,Tracy,CA MOE0217 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G07WZ-0011 Reported <br /> Sacramento CA,95833 Project Manager Jeff Brooks 05/19/05 16 42 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Liimt Units Level Result %REC Limits RPD Lurnt Notes <br /> Batch 5E13005-EPA 5030B P/f/EPA 8260B <br /> Laboratory Control Sample Dup(SE13005-BSD1) Prepared&Analyzed 05/13/05 <br /> tert-Amyl methyl ether 104 050 ug/l 100 104 80-115 7 15 <br /> Benzene 939 050 100 94 65-115 4 20 <br /> tert-Butyl alcohol 509 20 500 102 75-I50 2 25 <br /> Di-isopropyl ether 102 050 100 102 75-125 3 15 <br /> Ethanol 193 100 200 96 70-135 33 35 <br /> Ethyl tert-butyl ether 105 050 100 105 75-I30 6 25 <br /> Ethylbenzene 9 99 050 100 100 75-135 5 15 <br /> Methyl tent-butyl ether 102 050 100 102 65-125 0 20 <br /> Toluene 980 050 100 98 85-120 1 20 <br /> Xylenes(total) 294 050 300 98 85-125 0 20 <br /> Surrogate 12-Dichloroethane-d4 522 500 104 60-135 <br /> bMatnx Spike(SE13005-MSI) Source MOE0219-02 Prepared&Analyzed 05/13/05 <br /> Ethylbenzene 3860 50 ug/1 784 3000 110 75-135 <br /> Methyl tert-butyl ether 1160 50 960 200 100 65-125 <br /> Toluene 7630 50 3290 4200 104 85-120 <br /> Xylenes(total) 16200 50 3850 12000 109 85-125 <br /> Gasoline Range Organics(C4-C12) 100000 5000 44000 62000 86 70-124 <br /> Surrogate 1 2-Dichloroethaned4 Soo 500 100 60-135 <br /> Matrix Spike Dup(SE13005-MSDI) Source MOE0219-02 Prepared&Analyzed 05/13/05 <br /> Ethylbenzme 3730 50 ug/l 784 3000 93 75-135 3 15 <br /> Methyl tert-butyl ether 1060 50 960 200 90 65-125 9 20 <br /> Toluene 7510 50 3290 4200 101 85-120 2 20 <br /> Xylenes(total) 15900 50 3850 12000 101 85-125 2 20 <br /> Gasoline Range Organics(C4-Cl2) 95600 5000 44000 62000 76 70-124 4 20 <br /> Surrogate 12-Dichloroethane-d4 4 55 500 91 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 9 of 10 <br />