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i�i) !ISequoiA 895 Jarvis Drive <br /> Morgan Hill,CA 95037 <br /> 7 (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> vaww.sequoialabs.com <br /> ,r <br /> URS Corporation[Arco]] Project:ARCO#2130,Stockton,CA M010544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOBZK-0002 Reported: <br /> Sacramento CA,95833 Project ManagenVemon P.Elarth 09/29/05 14:23 <br /> Volatile Organic Compounds by EPA Method 8260B-Quality Control i <br /> t Sequoia Analytical-Morgan Hill <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> �p <br /> Batch 5122001 -EPA 5030B PIT 1 EPA 8260B <br /> Matrix Spike;(5I22001-MSI) Source:M010544-08 Prepared&Analyzed:09/22/05 <br /> tent-Amyl methyl ether 329 10 ugll 301 ND 109 80-115 <br /> Benzene 107 10 103 ND 104 65-115 <br /> tert-Butyl alcohol 3120 400 " 2860 ND 109 75-120 <br /> Di-isopropyl ether 275 10 "' 303 ND 91 75-125 <br /> 1,2-Dichloroethane 292 10 294 ND 99 85-130 <br /> Ethanol 3990 2000 2830 260 132 70-135 HL <br /> Ethyl tert-butyl ether 313 10 300 ND 104 75-130 <br /> Ethylbenzene 349 10 151 220 85 75-135 <br /> Methyl tert-bury]ether 156 10 140 3.6 109 65-125 <br /> Toluene 734 10 744 ND 99 85-120 <br /> Xylenes(total) 1500 10 828 790 86 85-125 <br /> Gasoline Range:Organics(C4-C12) 27000 E000 8800 24000 34 70-i 24 LN <br /> 'urrogate:l•1-Dichloroethane-d4 1.96 1.50 78 ti0-135 <br /> Matrix Spike Dup(5122001-]NSDI) Source:M010544-OS Prepared&Analyzed:09/22/05 <br /> tert-Amyl methyl ether 331 10 ug/l 301 ND 110 80-115 0.6 15 <br /> Benzene 105 10 103 ND 102 65-115 2 20 <br /> tert-Butyl alcohol 3170 400 2860 ND 111 75-120 2 25 <br /> Di-isopropyl etlier 272 10 303 ND 90 75-125 .1 15 <br /> r <br /> 1,2-Dichloroethane 295 10 294 ND 100 85-130 1 20 <br /> Ethanol 5210 2000 2830 260 175 70-135 27 35 HL <br /> Ethyl tert-butyl ether 315 10 300 ND 105 75-130 0.6 25 <br /> Ethylbenzene 348 10 " 151 220 85 75-135 0.3 15 <br /> Methyl tert-butyl ether 155 10 140 3.6 108 65-125 6.6 20 <br /> Toluene 719 10 744 ND 97 85-120 2 20 <br /> Xylenes(total) .; 1480 i0 828 790 83 $5-125 1 20 LN <br /> Gasoline Range.iprganics(C4-C12) 26600 1000 8800 24000 30 70-124 1 20 LN <br /> Surrogate:1,1-Dichloroethane-d4 1,91 '1.50 77 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 17 of 25 <br />