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Drive <br /> a_ _� (409) <br /> 885lSequoia Morgan HillCA CA 9503750377 776-9600 <br /> Analytical FAX(408)782-6308 <br /> www sequoialabs com <br /> URS Corporation[Arco 1] 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 H111 <br /> Reporting Spike Source "/REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5L22037-EPA 5030B PIT 1 EPA 8260B <br /> Matrix Spike Dup(5L22037-MSD1) Source MOL0602-12 Prepared 12/22/05 Analyzed 12/23/05 <br /> tert-Amyl methyl ether 380 25 ug/l 376 ND 101 80 115 05 15 <br /> Benzene 172 25 129 1 8 119 65 115 2 20 LM <br /> tent Butyl alcohol 351 100 358 ND 98 75 120 2 25 <br /> Di-isopropyl ether 493 25 37 8 14 127 75 125 06 15 LM <br /> 1,2-Dichloroethane 337 25 368 280 155 85 130 0 20 BB,LM <br /> Ethanol 546 500 354 ND 154 70-135 55 35 HL,BA,IC <br /> Ethyl tert butyl ether 420 25 376 ND 112 75 130 05 25 <br /> Ethylbenzene 187 25 188 ND 99 75 135 4 15 <br /> Methyl tert-butyl ether 424 25 176 25 99 65 125 2 20 <br /> Toluene 105 25 930 1 2 112 85 120 3 20 <br /> Xylenes(total) 943 25 103 28 89 85 125 6 20 <br /> asoline Range Organics(C4-C12) 1350 250 1100 140 110 60 140 2 25 <br /> arrogate 12 Dichloroethane d4 219 250 92 60 135 <br /> Batch 5L29003-EPA 5030B PIT/EPA 8260B <br /> Blank(5L29003-BLK1) Prepared&Analyzed 12/29/05 <br /> tert Amyl methyl ether ND 050 ug/l <br /> Benzene ND 050 " <br /> Cert Butyl alcohol ND 20 <br /> Di isopropyl ether ND 050 " <br /> 1,2 Dichloroethane ND 050 " <br /> Ethanol ND 100 <br /> Ethyl tert butyl ether ND 050 " <br /> Ethylbenzene ND 050 <br /> Methyl tert-butyl ether ND 050 <br /> Toluene ND 050 <br /> Xylenes(total) ND 050 " <br /> Gasoline Range Organics(C4-C12) ND 50 " <br /> Surrogate 1 2-Dichloroethane d4 473 500 95 60 135 <br /> i <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 stared results are reported on a wet height basis <br /> Thii analytical report must be reproduced in its enriretj <br /> Page 25 of 28 <br />