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a— ) <br /> . 8851 CA Drove <br /> Sequoia MocganHdl CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(409)792-6308 <br /> 0 www sequoialabs corn <br /> URS Corporation[Arcol] Project ARCO#2130,Stockton,CA MOL0602 <br /> 2870 Gateway Oaks Dr,Ste 300 Project dumber GOBZK-0002 Reparte,d <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 01/04/06 16 01 <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 Limn Notes <br /> Batch 5L29003-EPA 5030B PIT/EPA 8260B <br /> Laboratory Control Sample(5L29003-BSI) Prepared&Analyzed 12/29/05 <br /> tert Amyl methyl ether 736 050 ug/l 752 98 80-115 <br /> Benzene 258 0 50 2 58 100 65 115 <br /> tert-Butyl alcohol 75 8 20 716 106 75-150 <br /> Di-isopropyl ether 825 050 756 109 75 125 <br /> 1,2-Dichloroethane 815 050 736 Ill 85-130 <br /> Ethanol 97 2 100 708 137 70-135 HL <br /> Ethyl tert-butyl ether 7 65 050 752 102 75-130 <br /> Ethylbenzene 344 050 3 77 91 75-135 <br /> Methyl tert-butyl ether 3 68 050 3 51 105 65-125 <br /> Toluene 182 0 50 186 98 85-120 <br /> Xylenes(total) 195 050 206 95 85-125 <br /> AI@Lsolin Range Organics(C4 C12) 197 50 220 90 60 140 <br /> -Surrogate 12 D:chloroethane-d4 4 63 500 93 60-135 <br /> Matrix Spike(5L29003-MSI) Source MOL0602-17RE1 Prepared&Analyzed 12/29/05 <br /> tert-Amyl methyl ether 73 8 5 0 ug/l 75 2 1 3 96 80 115 <br /> Benzene 247 5 0 25 8 ND 96 65-115 <br /> tert-Butyl alcohol 739 200 716 ND 103 75-120 <br /> Di-isopropyl ether 768 5 0 75 6 ND 102 75 125 <br /> 1,2 Dichloroethane 320 5 0 73 6 250 95 85-130 <br /> Ethanol 923 1000 708 140 ill 70-135 <br /> Ethyl tert-butyl ether 715 5 0 75 2 ND 95 75-130 <br /> Ethylbenzene 33 1 5 0 377 ND 88 75-135 <br /> Methyl tert butyl ether 322 5 0 35 1 ND 92 65 125 <br /> Toluene 172 5 0 186 ND 92 85-120 <br /> Xylenes(total) 180 5 0 206 ND 87 85-125 <br /> Gasoline Range Organics(C4-C 12) 2140 500 2200 410 79 60-140 <br /> Surrogate 12-Dicliloroethane d4 441 5 00 88 60-135 <br /> Sequoia Analytical -Morgan Hill ill The results in this report apply to the samples analyzed in accordance wuh the chain of <br /> custodj document Unless otherwise stated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 26 of 28 <br />