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88$Jarvis Drive <br /> 4D <br /> Sequoia Morgan Hill CA 95037 � <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www sequoialabs com <br /> URS Corporation[Arco]] Project ARCO#2186,Stockton,CA MOI0313 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZM-0002 Reported <br /> Sacramento CA,95833 Project Manager Vernon P Elarth 09/28/05 10 46 <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 5I20037-EPA 5030B PIT/EPA 8260B <br /> Matrix Spike(5120037-MS1) Source M0I0295-03 Prepared 09/20/05 Analyzed 09/21/05 <br /> tent-Amyl methyl ether 140 so ug/I 150 27 92 80-115 <br /> Benzene 502 5 0 516 ND 97 65-115 <br /> tert-Butyl alcohol 1450 200 1430 110 94 75-120 <br /> Di-isopropyl ether 141 5 0 151 1 8 92 75-125 <br /> 1,2-Dibromoethane(EDB) 159 5 0 148 ND 107 85-120 <br /> 1,2-Dichloroethane 133 50 147 ND 90 85-130 <br /> Ethanol 1400 1000 1410 ND 99 70-135 <br /> Ethyl tcrt-butyl ether 138 5 0 150 ND 92 75-130 <br /> Ethylbenzene 62 4 5 0 754 ND 83 75-135 <br /> Methyl tert-butyl ether 168 5 0 70 2 100 97 65-125 <br /> Toluene 360 5 0 372 ND 97 85-120 <br /> Xylenes(total) 355 5 0 414 ND 86 85-125 <br /> Al&a.Sill Range Organics(C4-C12) 5410 500 4400 130 120 70-124 <br /> urrogate 1 2-Dichloroethane-d4 194 " 250 76 50-135 <br /> Matrix Spike Dup(5120037-MSDI) Source MOI0295-03 Prepared 09/20/05 Analyzed 09/21/05 <br /> tert-Amyl methyl ether 137 5 0 ug/) 150 2 7 90 80-115 2 15 <br /> Benzene 481 5 0 516 ND 93 65-115 4 20 <br /> tert-Butyl alcohol 1240 200 1430 110 79 75-120 16 25 <br /> Di-isopropyl ether 136 50 151 1 8 89 75-125 4 15 <br /> 1,2-Dibromoethane(EDB) 154 5 0 148 ND 104 85-120 3 15 <br /> 1,2-Dichloroethane 129 50 147 ND 88 85-130 3 20 <br /> Ethanol 1190 I000 1410 ND 84 70-135 16 35 <br /> Ethyl tert-butyl ether 135 5 0 150 ND 90 75-130 2 25 <br /> Ethylbenzene 600 50 754 ND 80 75-135 4 15 <br /> Methyl tert-butyl ether 166 50 702 100 94 65-125 1 20 <br /> Toluene 344 50 372 ND 92 85-120 5 20 <br /> Xylenes(total) 343 5 0 414 ND 83 85-125 3 20 LN <br /> Gasoline Range Organics(C4-C12) 5120 500 4400 130 113 70-124 6 20 <br /> Surrogate 12-Dichloroethane-d4 184 150 74 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 11 of 12 <br />