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4 <br /> Sequoia 685Jarvis CA5 3 <br /> Morgan Bill,CA 950377 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> www.sequoialabs.com <br /> URS Corporation[Arcoll Project:ARCO#2168,Stockton,CA MOK0278 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number:GOC81-0010 Reported: <br /> Sacramento CA,95833 Project ManagerNernon P.Elarth 11/15/05 17:42 <br /> Purgeable Hydrocarbons and Volatile Organic Compounds by EPA method 8260B -Quality Control <br /> Sequoia Analytical-Morgan Hill <br /> x <br /> Reporting Spike Source %REC RPD <br /> Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes <br /> Batch 5K10020-EPA 503OB/5035A McOH/EPA 8260B <br /> Blank(5K10020-BLK1) Prepared: 11/10/05 Analyzed: 11/11/05 <br /> Gasoline Range Organics(C4-C12) ND 2.5 mg/kg <br /> Benzene ND 0.050 " <br /> Toluene ND 0.050 <br /> Ethylbenzene ND 0.050 <br /> Xylenes(total) ND 0.050 " <br /> r Surrogate:1,2-Dichloroethane-d4 0.00442 0.00500 88 72-130 <br /> s <br /> Laboratory Control Sample(5K10020-BS1) Prepared: 11/10/05 Analyzed: 11/11/05 <br /> Gasoline Range Organics(C4-C 12) 19.0 2.5 mg/kg 16.5 115 60-140 <br /> �... <br /> Benzene 0.188 0.050 0.194 97 53-132 I <br /> Toluene 1.35 0.050 1.39 97 61-145 <br /> Ethylbenzene 0.278 0.050 0.283 98 73-138 <br /> Xylenes(total) 1.59 0.050 1.55 103 75-144 <br /> Surrogate:l,2-Dichloroethane-d4 0.00427 0.00500 85 72-130 <br /> Laboratory Control Sample Dup(SK10020-BSD1) Prepared: 11/10/05 Analyzed: 11/11/05 <br /> Gasoline Range Organics(C4-C 12) 17.1 2.5 mg/kg 16.5 104 60-140 11 25 <br /> Benzene 0.173 0,050 0.194 89 53-132 8 25 <br /> Toluene 1.25 0.050 1.39 90 61-145 8 25 <br /> Ethylbenzene 0.262 0.050 " 0.283 93 73-138 6 25 I <br /> r Xylenes(total) 1.50 0.050 1.55 97 75-144 6 25 <br /> Surrogate:42-Dichloroethane-d4 0.00413 <br /> 0.00500 83 72-130 <br /> r <br /> P . <br /> r <br /> �r <br /> r Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain o <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 5 of 7 <br /> �i <br />