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Sequoia Morgan CA 50Jarvis 950V7 <br /> organ 37 <br /> a— )� (408)7 9600 <br /> Analytical <br /> FAX(408)78922 6308 <br /> www sequoialabs com <br /> URS Corporation[Arco II Project ARCO#2130,Stockton,CA MOF0835 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZK-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 07/07/05 12 24 <br /> Volatile Organic Compounds by EPA Method 8260B -Quality Control <br /> Sequoia Analytical -Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Lunit Units Level Result %REC Limits RPD Limn Notes <br /> Batch SF30006-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(5F30006-BS2) Prepared&Analyzed 06/30/05 <br /> Benzene 587 050 ug/l 608 97 65-115 <br /> Ethylbenzene 739 050 784 94 75-135 <br /> Methyl tert-butyl ether 955 050 960 99 65-125 <br /> Toluene 386 050 329 117 85-120 <br /> Xylenes(total) 376 050 38 5 98 85-I25 <br /> Gasoline Range Organics(C4-4212) 423 50 440 96 70-124 <br /> Surrogate 1,2-Dtchloroethane-d4 554 500 111 60 135 <br /> Laboratory Control Sample Dup(5F30006-BSDI) Prepared&Analyzed 06/30/05 <br /> tert-Amyl methyl ether l 1 9 050 ug/l 100 119 80-115 2 ]5 HL <br /> Benzene 102 050 100 102 65-115 6 20 <br /> tert-Butyl alcohol 486 so 500 97 75-150 1 25 <br /> 0Di-isopropyl ether 117 050 100 117 75-125 3 15 <br /> -12-Dichloroethane 114 050 100 114 85 130 3 20 <br /> thanol 223 100 200 110 70-135 6 35 <br /> Ethyl tert-butyl ether 10 2 050 100 102 75-130 4 25 <br /> Ethylbenzene 861 050 Wo 86 75-135 7 15 <br /> Methyl tert-butyl ether 104 050 100 104 65-125 4 20 <br /> Toluene 974 050 100 97 85-120 8 20 <br /> Xylenes(total) 25 7 050 300 86 85-125 9 20 <br /> Surrogate 11-Dichloroethane-d4 540 500 10s 60-135 <br /> Matrix Spike(5F30006-MS1) Source MOF0888-16 Prepared&Analyzed 06/30/05 <br /> Benzene 739 050 ugA 608 ND 122 65-115 LM <br /> Ethylbenzene 936 050 784 ND 119 75-135 <br /> Methyl tert-butyl ether 25 8 050 960 11 154 65-125 LM <br /> Toluene 491 050 329 ND 149 85-120 LM <br /> Xylenes(total) 481 050 385 ND 125 85-125 <br /> Gasoline Range Organics(C4-C12) 474 50 440 10 105 70 124 <br /> Surrogate 1 2-Dichloroelhane-d4 545 500 109 60-135 <br /> Sequoia Analytical-Morgan Hill Vie 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 19 of 21 <br />