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�.r 685 Jarvis Dore <br /> Sequoia a Morgan Hit' CA <br /> 776-9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs Com <br /> URS Corporation(ArcoI] Project ARCO#12130,Stockton,CA MOL0602 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZK-0002 Reported <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 Limit Notes <br /> Batch 5L22037-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(5L22037-BSI) Prepared 12/22/05 Analyzed 12/23/05 <br /> Cert-Amyl methyl ether 759 050 ugll 752 101 80 115 <br /> Benzene 294 050 258 114 65-115 <br /> tert-Butyl alcohol 722 20 716 101 75-150 <br /> Di-isopropyl ether 9 17 050 756 121 75 125 <br /> 1,2-Dichlorocthane 842 050 736 114 85-130 <br /> Ethanol 132 100 708 186 70-135 HL,1C <br /> Ethyl iert-butyl ether 822 050 752 109 75-130 <br /> Ethylbenrene 357 050 377 95 75-135 <br /> Malty]tert butyl ether 3 31 050 3 51 94 65-125 <br /> Toluene 199 050 186 107 85-120 <br /> Xylenes(total) 182 050 206 88 85-125 <br /> asoline Range Organics(C4 C12) 2I5 50 220 98 60-140 <br /> urrogate 1 2-Dichloroethane d4 231 250 92 60-135 <br /> Matrix Spike(5L22037-MSI) Source MOL0602-I2 Prepared 12/22/05 Analyzed 12/23/05 <br /> Cert-Amyl methyl ether 382 25 ug/1 376 ND 102 80-115 <br /> Bcmene 175 25 129 1 8 122 65-115 LM <br /> tett-Butyl alcohol 343 100 358 ND 96 75-120 <br /> Di-iwpropyl ether 496 25 378 1 4 128 75-125 LM <br /> 1 2-Dichloroethane 337 25 369 280 155 85-130 BB LM <br /> Ethanol 962 500 354 ND 272 70 135 HL,IC <br /> Ethyl tent-butyl ether 422 25 376 ND 112 75 130 <br /> Lthylbenzene 194 25 188 ND 103 75-135 <br /> Methyl Cert bury]ether 41 6 25 176 25 94 65-125 <br /> Toluene 108 25 930 12 115 85-120 <br /> Xylenes(total) 999 2 5 103 28 94 85-125 <br /> Gasoline Range Organics(C4-C 12) 1380 250 1100 140 113 60-140 <br /> Surrogate 12-Dichloroethane d4 123 250 89 60 135 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the vamplet analyzed in accordance with the chain of <br /> custody document Unless otherwise stated results are reported on a wet wetghi basis <br /> This analytrcal report must be reproduced in its entirety <br /> Page 24 of 28 <br />