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Sequoia 885 1,CA 95037 <br /> Morgan Hill,CA 95037 <br /> 4D <br /> Anal tical (408)7 -9600 <br /> � � FAJC(408)78292-6308 <br /> www.sequoialabs.com <br /> ` URS Corporation[Arcot <br /> ] Project:ARCO#2168,Stockton,CA MOK0900 <br /> i 2870 Gateway Oaks Dr.,Ste 300 Project Nttmber:GOC81-0010 Reported: <br /> Sacramento CA,95833 Project Reported: <br /> P.Elarth 11/30/05 12:28 <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 /> C Batch 5K28012-EPA 5035/EPA 8260B <br /> Matrix Spike Dup(5K28012-MSD1) Source:MOK0801-03 Prepared&Analyzed: 11/28/05 <br /> 4 tert-Am l methyl ether <br /> Y Y 0.0132 0.0050 mg/kg 0.0150 0.00017 87 80-130 10 25 <br /> Benzene 0.00436 0.0050 0.00516 ND 84 65-125 21 20 RB <br /> C tert-Butyl alcohol 0.135 0.020 0.143 ND4 <br /> 9 - <br /> 80 135 3 20 <br /> Di-isopropyl ether 0.0128 0.0050 0.0151 ND 85 85-115 16 20 <br /> 1 2-Dibromoethane(EDB) 0.0129 0.0050 0.0149 ND 87 85-130 13 15 <br /> a <br /> t 1,2-Dichloroethane 0.0109 0.0050 0.0147 ND 74 63-124 3 25 <br /> Ethanol 0.100 0.10 0.142 ND 70 35-150 13 40 <br /> Ethyl tent-butyl ether 0.0133 0.0050 0.0150 ND 89 80-125 15 25 <br /> Ethylbenzene 0.00559 0.0050 0.00754 ND 74 80-135 16 20 LN <br /> r Methyl tert-butyl ether 0.00580 0.0050 0.00702 ND 83 75-115 6 35 <br /> Toluene 0.0288 0.0050 " 0,0372 0.00020 77 85-125 12 15 LN <br /> Xylenes(total) 0.0312 0.0050 0.0412 ND 76 80.140 3 20 LN <br /> i <br /> Gasoline Range Organics(C4-C 12) 0.388 0.10 0.440 ND 88 53-126 10 25 <br /> Surrogate:l,1-Dichloroethane-d4 0.00343 0.00500 69 60-125 <br /> Batch 5K28023-EPA 5030B/5035A McOH/EPA 8260E <br /> Blank(SK28023-BLK1) <br /> Prepared&Analyzed: 11/28/05 <br /> Gasoline Range Organics(C4-C12) ND 2.5 mg/kg <br /> Surragate:l,2-Dichloroethane-d4 0.00590 0.00500 118 60-115 <br /> Laboratory Control Sample(5K28023-BS1) Prepared&Analyzed: 11/28/05 <br /> Gasoline Range Organics(C4-C 12) 14.6 2.5 mg/kg 16.5 88 60-140 <br /> Surrogate:l,2-Dichloroethane-d4 0.00587 0.00500 117 60-115 <br /> Laboratory Control Sample Dup(5K28023-BSD1) Prepared&Analyzed: 11/28/05 <br /> Gasoline Range Organics(C4-C 12) 15.2 2.5 mglkg 16.5 92 60-140 4 25 <br /> Surrogate:l,2-Dichloroethane-d4 0.00581 0.00500 116 60-125 <br /> I <br /> Sequoia Analytical-Morgan Hill <br /> q � g 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 11 of 12 I <br /> t <br /> 1 <br />