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K95 Jarvis Drive <br /> (D— Sequoia Morgan Hill CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs com <br /> URS Corporation [Arco]I Project ARCO#6100,Tracey,CA MOL0796 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOC IY-0005 Reported <br /> Sacramento CA,95833 Project Manager Jay Johnson 01/16/06 16 27 <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 6AO3003-EPA 5030B P/T/EPA 8260E <br /> Matrix Spike Dup(6A03003-MSD1) Source MOL0995-03 Prepared&Analyzed 01/03/06 <br /> tert-Amyl methyl ether 799 50 ugll 752 ND 106 80-115 7 15 <br /> Benzene 242 5 0 258 ND 94 65-115 12 20 <br /> tert-Butyl alcohol 842 50 716 ND 118 75-120 19 25 <br /> Di-isopropyl ether 814 50 75 6 ND 108 75-125 2 15 <br /> 1 2-Dibromoethane(EDB) 775 50 74 4 ND 104 85-120 3 15 <br /> 1,2-Dichloroethane 76 9 5 0 736 ND 104 85-130 3 20 <br /> Ethanol 865 1000 708 ND 122 70-135 7 35 <br /> Ethyl tert-butyl ether 774 5 0 75 2 ND 103 75-130 9 25 <br /> Ethylbenzene 31 6 5 0 377 ND 84 75-135 10 15 <br /> Methyl tert-butyl ether 663 5 0 35 1 660 9 65-125 1 20 BB LN <br /> Toluene 174 5 0 186 ND 94 85-120 4 20 <br /> 7�yLnes(total) 202 5 0 206 ND 98 85-125 7 20 <br /> me Range Organics(C4-C 12) 2820 500 2200 570 102 60-140 0 7 25 <br /> Surrogate 1 2-Dichloroethane-d4 227 250 91 60-135 <br /> Batch 6AO4010- EPA 5030B P/T/EPA 8260B <br /> Blank(6A04010-BLK1) Prepared&Analyzed 01/04/06 <br /> tert-Amyl methyl ether ND 0 50 ugll <br /> Benzene ND 0 50 " <br /> tert-Butyl alcohol ND 20 " <br /> Di-isopropyl ether ND 0 50 " <br /> 1,2-Dibromoethane(EDB) ND 0 50 " <br /> 1,2-Dichloroethane ND 050 " <br /> Ethanol ND 100 IC <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Ethylbenzene ND 0 50 " <br /> Methyl tent-butyl ether ND 0 50 " <br /> Toluene ND 050 " <br /> Xylenes(total) ND 0 50 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 12-Dichloroethane-d4 262 250 105 60-135 <br /> uola Analytical- Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document Unless otherwise slated results are reported on a wet weight basis <br /> This analytical report must be reproduced in its entirety <br /> Page 15 of 19 <br />