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885 J r"s Drive <br /> Sequoia Morgan Hill CA 95037 <br />' (408)776 9600 <br /> Analytical w (408)782 6308 <br /> seqorn <br /> www equo�alabs corn <br /> URS Corporation fArcoII Project ARCO#0760,Lode,CA MNK0808 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0461 Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 12/10/04 17 00 <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 4LO8003-EPA 5030B Modified/EPA 8260B <br /> Laboratory Control Sample(4L08003-BS2) Prepared&Analyzed 12/08/04 <br />' Benzene 000567 00050 mg/kg 000640 89 59-126 <br /> Ethylbenzene 000819 00050 000752 109 60-145 <br /> Methyl tert-butyl ether 000913 00050 000992 92 47-149 <br /> Toluene 00338 00050 00319 106 66-142 <br />' Xylenes(total) 00372 00050 00366 102 83-135 <br /> Gasoline Range Organics(C4-C 12) 0 504 0 10 0 440 115 53-126 <br /> Surrogate 12-Dichloroethane-d4 000444 000500 89 78-136 <br /> Laboratory Control Sample Dup(4LO8003-BSDI) Prepared 12/08/04 Analyzed 12/09/04 <br /> tert-Amyl methyl ether 00106 00050 mg/kg 00100 106 78-135 09 25 <br /> Benzene 00104 00050 00100 104 59-126 2 25 <br /> tert-Butyl alcohol 00614 0 020 00500 123 20-164 3 25 <br /> IWi-isopropyl ether 00122 00050 „' 00100 122 72-127 0 25 PE <br /> 1,2-Dibromoethane(EDB) 000954 00050 00100 95 83-138 2 25 <br /> 1,2-Dichloroethane 000959 00050 00100 96 83-130 3 25 <br /> Ethanol 0 129 0 10 11 0200 64 51-130 34 25 RB <br /> Ethyl tert-butyl ether 00105 00050 00100 105 77-129 2 25 <br /> Ethylbenzene 00103 00050 00100 103 60-145 4 25 <br /> Methyl tert-butyl ether 00117 00050 " 00100 117 47-149 2 25 <br /> Toluene 000995 00050 00100 100 66 142 8 25 <br /> Xylenes(total) 00127 00050 00300 109 83-135 8 25 <br />' Surrogate 1 2-Dichloroethane44 000435 000500 87 78-136 <br /> Matrix Spike(4L08003-MSI) Source MNL0005-08 Prepared&Analyzed 12/08/04 <br /> Benzene 000498 00050 mg/kg 000640 ND 78 59-126 <br /> Ethylbenzene 000692 00050 000752 ND 92 60-145 <br />' Methyl tert-butyl ether 000800 00050 i; 000992 ND 81 47-149 <br /> Toluene 00291 00050 00319 000015 91 66-142 <br /> Xylenes(total) 00321 00050 00366 000058 86 83 135 <br /> Gasoline Range Organics(C4-C 12) 0 369 010 0 440 ND 84 53-126 <br /> Surrogate 1 2-Dichloroethane-d4 000431 000500 86 78-136 <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 9of13 <br /> r <br />