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885 Jarvis Drive <br /> Sequoia Morgan Hill,CA 95037 <br /> Analytical c408'776-9600 <br /> FAX(408)7$2-6308 <br /> www.seauoialahs.corr <br /> URS Corporation f I Project: ARCO#548,Stockton,Ca <br /> 2870 Gateway Oaks Dr.,Ste 300 Project Number: ARCO 4548,Stockton,CA Reported: <br /> Sacramento CA,95833 Project Manager: Vern Elarth 10/09/02 08:29 <br /> Total Purgeable Hydrocarbons(C6-C10)by EPA 8015B modified,BTEXM 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 /> Batch 2127003-EPA 5030B(PITT <br /> Matrix Spike(2127003-MS1) Source:MLI0466-111 Prepared&Analyzed:09/27/02 <br /> Gasoline Range Organics(C6-C10) 506 50 ug/I 550 ND 92.0 60-140 <br /> Gasoline Range Organics(C6-C10) 506 50 mg/m3 Air 550 ND 89.3 60-140 <br /> Benzene 9.85 0.50 " 6.60 ND 147 60-140 QM-07 <br /> Benzene 9.85 0.50 u8n 6.60 ND 147 60-140 QM-07 <br /> Toluene 45.3 0.50 mg/m'Air 39.7 ND 113 60-140 <br /> Toluene 45.3 0.50 ug/l 39.7 ND 113 60-140 <br /> Ethylbenzene 10.3 0.50 " 9.20 ND 112 60-140 <br /> Ethylbenzene 10.3 0.50 mg/ml Air 9.20 ND 112 60-140 <br /> Xylenes(total) 49.8 0.50 ug/l 46.1 ND 107 60-140 <br /> Xylenes(total) 49.8 0.50 mg/m'Air 46.1 ND 107 60-140 <br /> Surrogate:a,a,a-Trifluorotoluene 13.2 ug/l 10.0 131 70-130 QM-07 <br /> Surrogate:a,a,a-Trifluorotoluene 13.2 mg/m'Air 10.0 131 70-130 QM-07 <br /> A&Matrix Spike Du 2127003-MSD3 Source:ML10466-11 Prepared&Analyzed:09/27/02 <br /> Gasoline Range Organics(C6-CIO) 464 50 mg/ml Air 550 ND 85.3 60-140 4.44 25 <br /> Gasoline Range Organics(C6-C10) 484 50 ug/l 550 ND 88.0 60-140 4.44 25 <br /> Benzene 9.16 0.50 mg/ml Air 6.60 ND 136 60-140 7.26 25 <br /> Benzene 9.16 0.50 ug/l 6.60 ND 136 60-140 7.26 25 <br /> Toluene 42.4 0.50 39.7 ND 106 60-140 6.61 25 <br /> Toluene 42.4 0.50 mg/ml Air 39.7 ND 106 60-140 6.61 25 <br /> Ethylbenzene 9.66 0.50 " 9.20 ND 105 60-140 6.41 25 <br /> Ethylbenzene 9.66 0.50 ug/l 9.20 ND 105 60-140 6.41 25 <br /> Xylenes(total) 46.6 0.50 " 46.1 ND 100 60-140 6,64 25 <br /> Xylenes(total) 46.6 0.50 mg/ml Air 46.1 ND 100 60-140 6.64 25 <br /> Surrogate:a,a,a-Trifluorotoluene 11.6 ug/l 10.0 116 70-130 <br /> Surrogate:a,a,a-Trifluorotoluene 11.6 mglm'Air 10.0 116 70-130 <br /> Sequoia Analytical-Morgan Hill The results in this report apply to the samples analyzed in accordance with the chain <br /> of custody document. This analytical report must be reproduced ih its entirety. <br /> 6of8 <br />