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885 JarVls Drive <br /> Sequoia Morgan Hall CA 95637 <br /> (468)776 9606 <br /> Analytical FAX 63o8 <br /> www sequoiquoialabahs corn <br /> URS Corporation[ArcoI I Project ARCO#2130,Stockton,CA MOL0602 <br /> 2870 Gateway Oaks Dr,Ste 300 Project Number GOBZK-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 °/.REC RPD <br /> Analyte Result Limit Units LeNel Result %REC Limits RPD LimitNotes <br /> Batch 5L22023-EPA 5030B P/T/EPA 8260B <br /> Laboratory Control Sample(5L22023-BS1) Prepared&Analyzed 12/22/05 <br /> tert-Amyl methyl ether 176 050 ug/l 150 117 80-115 HL <br /> Benzene 495 050 5 16 96 65-115 <br /> tert-Butyl alcohol 119 20 143 83 75-150 <br /> Di-isopropyl ether 135 050 151 89 75-125 <br /> 1,2-Dichloroethane 15 3 050 147 104 85-130 <br /> Ethanol 172 100 142 121 70-135 <br /> Ethyl tert-butyl ether 174 050 15 0 116 75-130 <br /> Ethylbenzene 720 050 754 95 75-135 <br /> Methyl tert-butyl ether 640 0 50 7 02 91 65-125 <br /> Toluene 35 1 0 50 372 94 85 120 <br /> Xylenes(total) 427 0 50 412 104 85-125 <br /> asolme Range Organics(C4-C 12) 447 50 440 102 60-140 <br /> urrogate 12-Drchloroethane-d4 539 500 108 60-135 <br /> Matrix Spike(5L22023-MSI) Source MOL0602-14 Prepared 12/22/05 Analyzed 12/23/05 <br /> tori-Amyl methyl ether 177 50 ug/l 150 ND 118 80-115 HL <br /> Benzene 607 5 0 51 6 550 110 65-115 <br /> tert-Butyl alcohol 1180 200 1430 ND 83 75-120 <br /> Di-isopropyl ether 136 5 0 151 ND 90 75-125 <br /> 1 2-Dichloroethane 176 5 0 147 ND 120 85-130 <br /> Ethanol 1950 1000 1420 ND 137 70-135 LM <br /> Ethyl tert butyl ether 173 5 0 150 ND 115 75-130 <br /> Ethylbenzene 298 5 0 75 4 220 103 75-135 <br /> Methyl tert-butyl ether 582 5 0 702 ND 83 65-125 <br /> Toluene 415 5 0 372 58 96 85-120 <br /> Xylenes(total) 616 5 0 412 170 108 85 125 <br /> Gasoline Range Organics(C4 C 12) 7530 500 4400 2700 110 60 140 <br /> Surrogate 12-Drchloroethane-d4 514 5 00 103 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 weigh!basis <br /> This analytical report must be reproduced in its ennreij <br /> Page 22 of 28 <br />