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4 DSequoia 885 Jarvis Drive <br /> Morgan Hili,CA 95037 <br /> A (406)776-9600 <br /> nalytical <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> i <br /> URS Cotpoiation[Arcol) Projecl:ARCO#2130,Stockton,CA MOI0544 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:G0BZK-0002 Reported: <br /> Sacramento iCA,95833 Project Manager:Vcmon P.Elarth 09/29/05 14:23 <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 /> t <br /> Batch 5123007-EPA 5030B PIT 1 EPA 8260B <br /> �l <br /> Matrix Spike(5123007,MS1) Source:M0I0544-14 Prepared&Analyzed:09/23105 <br /> tert-Amyl methyl ether 424 12 ugll 376 ND 113 - 80-115 <br /> Benzene 182 12 129 18 127 65-115 LM <br /> ter(-Butyl alcohol 3880 500 3580 ND 108 75-120 <br /> Di-isopropyl ether 367 12 378 ND 97 75-125 <br /> 1,2-Dichloroethane 380 12 368 ND 103 85-130 <br /> k <br /> Ethanol ' 5660 2500 '3540 ND 160 70-135 LM <br /> Ethyl tert-butyl"ether 402 12 376 ND 107 75-130 <br /> Ethylbenzene ! 207 12 188 32 93 75-135 <br /> .t <br /> Methyl tert-butyl ether 197 12 176 ND 112 65-125 <br /> Toluene 942 12 930 ND 101 85-120 <br /> Xylenes(total)! 1040 12 ". 1040 80 92 85-125 <br /> Gasoline RangeOrganics(C4-C12) 12900 1200 11000 7200 52 70-124 LN <br /> �iurrogate:l,2-Dichloraethane-d4 1.07 .1.50 83 6Q-135 <br /> :i <br /> Matrix Spike Dup{5123007=MSD1) Source:M010544-14 Prepared&Analyzed:09/23/05 <br /> tent-Amy]methyl ether 410 12 ug/l 376 ND 109 80-115 3 15 <br /> Benzene 174_ 12 129 18 121 65-115 4 20 LM <br /> tert-Butyl alcohol 4100 500 " 3580 ND 115 75-120 6 25 <br /> Di-isopropyl ether 353 12 378 ND 93 75-125 4 15 <br /> 1,2-Dichloroed ane 363 12 .368 ND 99 85-130 5 20 <br /> Ethanol , 5930 2500 3540 ND 168 70-135 5 35 LM <br /> Ethyl tett-butyl,!ether 394 12 376 ND 105 75-130 2 25 <br /> Ethylbenzene 203 12 188 32 91 75-135 2 15 <br /> Methyl tert-butyl ether 188 12 176 ND 107 65-125 5 20 <br /> Toluene 903 12 930 ND '97 85-120 4 20 <br /> Xylencs(total) 1030 12 1040 80 91 85-125 1 20 <br /> Et <br /> Gasoline Range Organics(C4-C12) 12200 1200 11000 7200 45 70-124 6 20 LN <br /> r <br /> Surrogate:1,2-Dichloroethane-d4 1.89 _ 2.50 76 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 weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 21 of 25 <br /> f <br />