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•� I <br /> a— ) <br /> . n 85 HILI rws 5037rive <br /> Sequoia Morgan Hill CA 45037 Analytical (409)776-4600 <br /> FAX(409)782 6308 <br /> www sequoialabs com <br /> 0 <br /> URS Corporation[Arco tI Project BP Heritage 411191,Stockton,CA MOG0813 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number 607WW-0016 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 08/05/05 14 59 <br /> Volatile Organic Compounds by EPA Method 8260B- Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source °/oREC RPA <br /> Analyte Result Limit Umts Level Result %REC Limits RPD Lieut Notes <br /> Batch 5G28004-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(5G28004-BSI) Prepared&Analyzed 07/28/05 <br /> Toluene 116 050 ug/l 100 116 85-120 <br /> Xylenes(total) 278 050 300 93 85-125 <br /> Surrogate 12-Dichloroethane-d4 263 250 105 60-135 <br /> Laboratory Control Sample(5G28004-BS2) Prepared&Analyzed 07/28/05 <br /> Benzene 613 050 ug/I 608 101 65-115 <br /> Ethylbenzene 742 050 784 95 75-135 <br /> Methyl tert-butyl ether 950 050 960 99 65-125 <br /> Toluene 384 050 329 117 85-120 <br /> Xylenes(total) 361 050 385 94 85-125 <br /> Gasoline Range Organics(C4-C12) 458 50 440 104 70-124 <br /> Surrogate 1 2-Dichloroethane-d4 242 150 97 60-135 <br /> laboratory Control Sample Dup(5G28004-BSD]) Prepared&Analyzed 07/28/05 <br /> tert-Amyl methyl ether 112 050 ug11 100 112 80-115 6 15 <br /> Benzene 112 050 100 112 65-115 09 20 <br /> tert-Butyl alcohol 486 20 500 97 75-150 9 25 <br /> Di isopropyl ether 10 3 050 100 103 75-125 3 15 <br /> Ethanol 195 100 200 98 70-135 3 35 <br /> Ethyl tert-butyl ether 106 050 100 I06 75-130 8 25 <br /> Ethylbenzene 9 37 050 100 94 75-135 1 15 <br /> Methyl tert-butyl ether 1 1 2 050 100 112 65-125 8 20 <br /> Toluene 11 5 050 100 115 85-120 09 20 <br /> Xylenes(total) 277 050 300 92 85-125 04 20 <br /> Surrogate I 1-Dichloroethane-d4 245 250 98 60-135 <br /> Matrix Spike(5G28004-MSI) Source MOG0812-11 Prepared&Analyzed 07/28/05 <br /> Benzene 314 2 5 ug/1 304 ND 103 65-115 <br /> Ethylbenzene 38 0 2 5 392 ND 97 75-135 <br /> Methyl tert-butyl ether 318 25 480 310 17 65-125 BB,LN <br /> Toluene 196 25 164 ND 120 85-120 <br /> Xylenes(total) 186 25 192 ND 97 85-125 <br /> Gasoline Range Organics(C4-C12) 2490 250 2200 170 105 70-124 <br /> Surrogate 12-Dichloroethane-d4 241 250 96 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 8 of 12 <br />