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885 Jarvis Drive <br /> Hi <br /> Sequoia Morgan Hill CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> n www sequvialabs coin <br /> URS Corporation[Arco 1] Project ARCO#2130,Stockton,CA MOL0602 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOB.ZK-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 °/RBC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5L29003 -EPA 5030E PIT 1 EPA 8260E <br /> Matnx Spike Dup(5L29003-M SD 1) Source MOL0602-17RE1 Prepared&Analyzed 12/29/05 <br /> tert-Amyl methyl ether 760 50 ugll 752 1 3 99 80-115 3 15 <br /> Benzene 247 50 258 ND 96 65-115 0 20 <br /> tert-Butyl alcohol 795 200 716 ND H] 75-120 7 25 <br /> Di isopropyl ether 758 50 756 ND 100 75-125 1 15 <br /> 1 2-Dichlorcethane 305 50 736 250 75 85-130 5 20 LN <br /> Ethanol 1030 1000 708 140 126 70 135 11 35 <br /> Ethyl tert-butyl ether 727 50 752 ND 97 75 130 2 25 <br /> Ethylbenzene 307 5 0 377 ND 81 75-135 8 15 <br /> Methyl ten-butyl ether 327 5 0 351 ND 93 65-125 2 20 <br /> Toluene 174 50 186 ND 94 85-120 1 20 <br /> Xylenes(total) 177 5 0 206 ND 86 85-125 2 20 <br /> Aftol Range Organics(C4-C12) 2110 500 2200 410 77 60-140 1 25 <br /> 1111wrrogate 1 1-Dichloroethane-d4 455 500 91 60 135 <br /> Sequoia Analytical -Morgan Hill The results in this report apply to the samples analyzed in accordance ivuh the chain of <br /> custody document Unless otherwise stated results are reported on a wet weight burrs <br /> This analytical report must be reproduced in its eniirety <br /> Page 27 of 28 <br />