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I <br /> 885]erns Drive <br /> Sequoia Morgan Will CA 95037 <br />' 7 (408)776-9600 <br /> ��► Analytical FAX(408)782-6308 <br /> WWW sequoialabs cam <br /> URS Corporation[Arco// Project ARCO#0760,Lodi,CA N4NK0808 <br />' 2870 Gateway Oaks Dr,Ste 300 Project Number G09JZ-0461 Reported <br /> Sacramento CA,95833 Project Manager Vern Elarth 12/10/04 17 00 <br /> Volatile Organic Compounds by EPA Method 8260B - Quality Control <br />' Sequoia Analytical - Morgan Hill <br /> Reporting Spike Source °/uREC RPD <br /> Analyte Result limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 4LO8003-EPA 5030B Modified/EPA 8260B <br /> Matrix Spike Dup(4L08003-MSD1) Source MNL0005-08 Prepared&Analyzed 12/08/04 <br /> Benzene 000516 00050 mg/kg 000640 ND 81 59-126 4 25 <br /> Ethylbenzene 000731 00050 000752 ND 97 60-145 5 25 <br /> Methyl tert-butyl ether 000826 00050 000992 ND 83 47-149 3 25 <br /> Toluene 00308 00050 00319 000015 96 66-142 6 25 <br /> Xylenes(total) 00336 00050 00366 000058 90 83-135 5 25 <br /> Gasoline Range Organics(C4-C12) 0 386 0 10 0 440 ND 88 53-126 5 25 <br /> Surrogate 12-Drchlaroethane-d4 000424 000500 85 78-136 <br /> IBatch 4LO9004-EPA 5030B P/T/EPA 8260B <br /> Blank(4L09004-BLK1) Prepared&Analyzed 12/09/04 <br /> tert-Amyl methyl ether ND 50 ug/l <br /> I*enzene ND 20 „ <br /> rt-Butyl alcohol ND 50 <br /> Di-isopropyl ether ND so " <br /> Ethanol ND 150 <br /> Ethyl tert-butyl ether ND 50 <br /> Ethylbenzene ND 20 " <br /> Methyl tert-butyl ether ND 50 " <br /> Toluene ND 20 <br /> Xylenes(total) ND 40 <br /> Gasoline Range Organics(C4-C12) ND 50 " <br />' Surrogate l 2-Dichloroethane-d4 457 " 500 91 78-129 <br /> Laboratory Control Sample(4L09004-BSI) Prepared&Analyzed 12/09/04 <br /> tert-Amyl methyl ether 953 50 ug/I 100 95 82-140 <br /> Benzene 9 62 2 0 100 96 69-124 <br /> tert-Butyl alcohol 546 50 500 109 56-131 <br /> Di isopropyl ether 104 50 100 104 76-130 <br /> Ethanol 248 150 200 124 31-143 <br /> Ethyl tert-butyl ether 998 5 0 100 100 81-121 <br /> Ethylbenzene 10 2 2 0 100 102 84-132 <br /> Methyl tert-butyl ether 100 50 100 100 63-137 <br />' Toluene 976 2 0 " 100 98 78-129 <br /> Xylenes(total) 318 40 300 106 83-137 <br /> Surrogate 12-Dichloroethane-d4 444 500 89 78-129 <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 10 of 13 <br />