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,!I) Sequoia 8851arvis Dtivc <br /> Morgan Hill,CA 95037 <br /> Analytical (408)776-9600 <br /> FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation rp tton[Arco/] Project:ARCO#2I68,Stockton,CA 1VIOK0481 <br /> 2874 Gateway Oaks Dr.,Ste 300 Project Number:GOC81-0010 Reported: <br /> Sacramento CA,95833 Project Manager:Vcmon P.Elarth 11/15/05 10:16 <br /> Purgeable Hydrocarbons and BTEX by EPA 8015B/8021B -Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> f Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> FBatch 5K11002-EPA 5035 heated Prg/EPA 8015BI8021B <br /> Blank(5K11002-BLKI) Prepared&Analyzed: 11/11/05 <br /> Gasoline Range Organics(C4-C 12) ND 0.10 mg/kg <br /> Benzene ND 0.0010 " <br /> Toluene ND 0.0010 <br /> Ethylbenzene ND 0.0010 " <br /> 'F <br /> Xylenes(total) ND 0.0010 " <br /> Surrogate.-a,a,a-Trjuorotoluene 0,0421 0.0400 106 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0371 „ l <br /> 0.0400 93 56-120 <br /> Ft. Laboratory Control Sample(SK11002-BSI) Prepared&Analyzed: 1I/11/05 <br /> Gasoline Range Organics(C4-C 12) 0.246 0,10 mg/kg 0.275 89 55-140 <br /> Benzene 0.00391 0.0010 0.00410 95 75-150 <br /> Toluene 0.0210 0.0010 " 0.0207 101 65-120 <br /> F Fthylbenzenc <br /> 0.00442 0.0010 1, 0.00485 91 65-125 <br /> Xylenes(total) 0.0253 0.0010 0.0238 106 65-125 <br /> FSurrogate:a,a,a-Triuorotoluene 0.0417 0.0400 107 64-145 <br /> . Surrogate:4-Bromofluorobenzene 0,0407 0,0400 101 56-110 <br /> Laboratory Control Sample Dup(5K11002-BSD1) Prepared&Analyzed: 11/11/05 <br /> Gasoline Range Organics(C4-C 12) 0.261 0.10 mg/kg 0.275 95 55-140 6 20 <br /> Benzene 0.00406 0.0010 ;; 0.00410 99 75.150 4 20 <br /> Toluene 0.0217 0.0010 0.0207 105 65-120 3 20 <br /> Ethylbenzene 0.00449 0,0010 0.00485 <br /> 93 65-125 2 20 <br /> Xylenes(total) 0.0260 0.0010 0.0238 109 65-125 3 20 <br /> Surrogate:a a a-Triuorotoluene 0.0416 11 0.0400 104 64-145 <br /> Surrogate:4-Bromofluorobenzene 0.0406 11 0.0400 102 56-120 <br /> k <br /> F <br /> F <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 slated,results are reported on a wet weight basis. <br /> This analytical report must be reproduced in its entirety. <br /> Page 5 of 7 <br /> i <br />