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18Hi Jarvis Drive <br /> Sequoia Morgan Hil! CA 95037 <br /> a—) (408)776-9600 <br /> � ► Analytical FAX(408)7826308 <br /> www sequoialabs coin <br /> URS Corporation[Arcot] Project BP Heritage#11194,Tracy,CA MOH0245 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G07WZ-0011 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 08/19/05 06 53 <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 Limns RPD Limit Notes <br /> Batch 5HO9043-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample Dup(5H09043-BSDI) Prepared&Analyzed 08/09/05 <br /> tent-Amyl methyl ether 957 050 ug/1 100 96 80-115 4 15 <br /> Benzene 110 050 100 110 65-115 2 20 <br /> tert-Butyl alcohol 543 20 500 109 75-150 19 25 <br /> Di-isopropyl ether 969 050 100 97 75-125 2 15 <br /> Ethanol 249 100 200 124 70-135 76 35 BA <br /> Ethyl tert-butyl ether 934 050 100 93 75-130 05 25 <br /> Ethylbenzene 112 050 100 112 75-135 09 15 <br /> Methyl tert-butyl ether 898 050 100 90 65-125 02 20 <br /> Toluene 114 050 100 114 85-120 0 20 <br /> Xylenes(total) 342 050 300 114 85-125 2 20 <br /> Surrogate 1 2-Dichloroethane-d4 234 250 94 60-135 <br /> Atrix Spike(5H09043-MSI) Source MOH0024-01 Prepared 08/09/05 Analyzed 08/10/05 <br /> enzene 554 25 ug/1 304 230 107 65-115 <br /> Ethylbenzene 462 25 392 27 111 75-135 <br /> Methyl tert-butyl ether 1350 25 480 920 90 65-125 <br /> Toluene 1860 25 1640 18 112 85-120 <br /> Xylenes(total) 2210 25 1920 41 113 85-125 <br /> Gasoline Range Organics(C4-C12) 26600 2500 22000 2000 112 70-124 <br /> Surrogate 1 2-Dichloroethane-d4 249 2.50 100 60-135 <br /> Matrix Spike Dup(5H09043-MSDI) Source MOH0024-01 Prepared 08/09/05 Analyzed 08/10/05 <br /> Benzene 538 25 ug/l 304 230 101 65-115 3 20 <br /> Ethylbenzene 453 25 392 27 109 75-135 2 15 <br /> Methyl tent butyl ether 1310 25 480 920 81 65-125 3 20 <br /> Toluene 1840 25 1640 18 111 85-120 1 20 <br /> Xylenes(total) 2150 25 1920 41 110 85-125 3 20 <br /> Gasoline Range Organics(C4-C12) 26000 2500 22000 2000 109 70-124 2 20 <br /> Surrogate 1 2-Dichloroethane-d4 245 250 98 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 13 of 16 <br />