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885 Jervis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> i (408)776-9600 <br /> Analytical FAX(406)782.6308 <br /> wwwsequoia[abs.com <br /> URS Corporation EArcoll Project: ARCO#{0548,Stockton,Ca MNH0053 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: NIP Reported: <br /> Sacramento CA,95833 Project Manager: Vernon P.Eiarth 08/06/04 16:20 <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 4HO5021 -EPA 5030B PIT <br /> Laboratory Control Sample(4H05021-BS2) Prepared&Analyzed: 08/05/04 <br /> Gasoline Range Organics(C4-C]2) 410 50 ugll 440 93 70424 <br /> Surrogate:l,2-Dichloroethane-d4 5.22 5.00 104 78-129 <br /> Laboratory Control Sample Dup(4H05021-BSDI) Prepared&Analyzed: 08/05/04 <br /> tert-Amyl methyl ether 11.3 0.50 ug/l 10.0 113 82-140 3 20 <br /> Benzene 11.2 0.50 10.0 112 69-124 7 20 <br /> tert-Butyl alcohol 52.8 20 50.0 106 56-131 4 20 <br /> Di-isopropyl ether 11.4 0.50 „ 10.0 114 76-130 10 20 <br /> 1,2-Dichloroethane 10.5 0.50 10.0 105 77-136 0 20 <br /> Ethanol 186 100 200 93 31-143 11 20 <br /> tert-butyl ether 1 L7 0.50 10.0 117 81-121 11 20 <br /> ,.Ethyl <br /> Ethylbenzene 11.7 0.50 " 10.0 117 84-132 7 20 <br /> Methyl tert-butyl ether 1 L5 0,50 10.0 115 63-137 8 20 <br /> Toluene 11.3 0.50 10.0 113 78-129 13 20 <br /> Xylenes(total) 33.4 0.50 30.0 111 83-137 8 20 <br /> Surrogate:l,2-Dichloroethane-d4 4.79 5.00 96 78-129 <br /> ' Matrix Spike(4H05021-MSI) Source: MNH0053-04 Prepared&Analyzed: 08/05/04 <br /> Benzene 6.82 0.50 ug/l 6.40 ND 107 69-124 <br /> Ethylbenzene 9.82 0.50 6.96 ND 141 84-132 LM <br /> Methyl tert-butyl ether 11.1 0.50 9.92 ND 112 63-137 <br /> ' Toluene 41.4 0.50 29.7 ND 139 78-129 LM <br /> Xylenes(total) 46.2 0.50 33.7 ND 137 83-137 <br /> Gasoline Range Organics(C4-Ci2) 440 50 440 ND 100 70-124 <br /> Surrogate:l,2-Dichloroethane-d4 4.96 5.00 99 78-129 <br /> Matrix Spike Dup(4H05021-MSDI) Source: MNH0053-04 Prepared&Analyzed: 08/05/04 <br /> Benzene 6.73 0.50 ug/l 6.40 ND 105 69-124 1 20 <br /> ' Ethylbenzene 9.53 0.50 6.96 ND 137 84-132 3 20 LM <br /> Methyl tert-butyl ether 11.2 0.50 9,92 ND 113 63-137 0.9 20 <br /> Toluene 41.9 0.50 29.7 ND 141 78-129 1 20 LM <br /> Xylenes(total) 45.1 0.50 33.7 ND 134 83-137 2 20 <br /> Gasoline Range Organics(C4-C12) 432 50 440 ND 98 70-124 2 20 <br /> Surrogate:l,2-Dichloroethane-d4 5.09 5.00 102 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 /> i <br /> ' Page 11 of 16 <br />