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885 Jarvis Dr <br /> Sequoia Morgan 11x71,CA 95037 <br /> (408)776-9600 <br /> Analytical FAX(408)782-6308 <br /> 10 :111111W., <br /> ww.sequrnalabs. <br /> Kcon <br /> URS Corporation R] Project: ARCO#548,Stockton,Ca MMB0732 <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO#548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 03/18/03 18:06 <br /> Total Purgeable Hydrocarbons (Cb-C10)by EPA 8015B modified,BTEX by EPA 8021B-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 /> Batclt 31327021-EPA 503413 PIT <br /> Blank 3B27021-BLKI Prepared&Analyzed:02/27/03 <br /> Gasoline Range Organics(C6-C10) ND 2.4 ppmv <br /> Benzene ND 0.031 " <br /> Toluene ND 0.027 " <br /> Ethylbenzene ND 0.023 " <br /> Xylenes(total) ND 0.023 " <br /> Methyl tert-butyl ether ND 0.14 " <br /> Surrogate:a,a,a-Trifluorotoluene 0.364 0.335 109 56-134 <br /> Laboratory Control Sample 31327021-BSD Prepared&Analyzed.02/27/03 <br /> Benzene 0.662 0.031 ppmv 0.627 106 62-125 <br /> Toluene 0.553 0.027 0.532 104 68-121 <br /> •Ethylbenzene 0.499 0.023 0.462 108 75-125 <br /> Xylenes(total) 1.51 0.023 1.38 109 76-121 <br /> Surrogate:a,a,a-Trifluorotoluene 0.352 0.335 105 56-134 <br /> Laboratory Control Sam le 31327021-13S2 Prepared&Analyzed:02/27/03 <br /> Gasoline Range Organics(C6-C10) 14.4 2.4 ppmv 14.2 101 65-142 <br /> Surrogate:a,a,a-Tris luorotoluene 0.480 0.335 143 56-134 S-02 <br /> Laboratory Control Sample Du (3B27021-BSDI) Pre aced&Analyzed:02/27/03 <br /> Benzene 0.681 0.031 ppmv 0.627 109 62-125 2.83 31 <br /> Toluene 0.569 0.027 0.532 107 68-121 2.85 29 <br /> Ethylbenzene <br /> 0.512 0.023 0.462 111 75-125 2.57 32 <br /> Xylenes(total) 1.55 0.023 " 1.38 112 76-121 2.61 29 <br /> Surrogate:a,a,a-Trifluorotoluene 0.356 0.335 106 56-134 <br /> Laborato y Control Sam le Du 3B27021-BSD2 Prepared&Anal ed:02/27/03 <br /> Gasoline Range Organics(C6-CIO) 14.1 2.4 ppmv 14.2 99,3 65-142 2.11 50 <br /> Surrogate:a,a,a-Trifluorotoluene 0.489 0.335 146 56-134 S-02 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> 0 of custody document. Unless otherwise stated,results are reported on a wet weight <br /> basis. This analytical report must be reproduced in its entirety. <br /> 5 of 9 <br />