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4DSequoia 404 N. CLane <br /> Walnut Creek,, CAA 9459$ <br /> %ff Analytical (925}988-9603 <br /> FAX(925)988-9673 <br /> ler Ryan,Inc.-Dublin Project: Unocal <br /> 'J747 Sierra Court Suite J Project Number: Unocal#11195 Reported: <br /> Dublin CA,94568 Project Manager: Deanna L.Harding 09-Dec-99 08:34 <br /> Total Purgeable Hydrocarbons (C6-C12), BTEX and MTBE by DHS LUFT <br /> Sequoia Analytical -Walnut Creek <br /> Reporting <br /> Analyte Result Limit Units Dilution Batch Prepared Analyzed Method Notes <br /> MW-10(W911580-09RE1)Water Sampled: 19-Nov-99 09:42 Received: 22-Nov-99 16:00 <br /> Methyl tert-butyl ether 9400 250 ug/l 100 9K29001 29-Nov-99 30-Nov-99 EPA <br /> Surrogate:a,a,a-Trifluorotoluene 103 % 70-130 " <br /> MW-11 (W911580-10)Water Sampled: 19-Nov-99 12:00 Received: 22-Nov-99 16:00 <br /> Purgeable Hydrocarbons ND 500 ug/1 10 9K29001 29-Nov-99 29-Nov-99 EPA <br /> Benzene 15 5.0 " " " 8015M/8020 <br /> Toluene ND 5.0 <br /> Ethylbenzene ND 5.0 <br /> Xylenes(total) ND 5.0 " <br /> Surrogate:a,a,a-Trifluorotoluene 107% 70-130 " <br /> MW-11 (W911580-10RE1)Water Sampled: 19-Nov-9912:00 Received: 22-Nov-99 16:00 <br /> Methyl tent-butyl ether 14000 500 ug/1 200 9K29001 29-Nov-99 30-Nov-99 EPA <br /> Surrogate:a,a,a-Trifluorotoluene 107% 70-130 <br /> MW-12(W911580-11)Water Sampled. 19-Nov-99 11.27 Received: 22-Nov-99 16:00 <br /> r �eable Hydrocarbons ND 50 ug/1 1 9K29001 29-Nov-99 29-Nov-99 EPA <br /> ene ND 0.50 „ " 8015M/8020 <br /> Toluene ND 0.50 <br /> Ethylbenzene ND 0.50 <br /> Xylenes(total) 0.94 0.50 " <br /> Methyl tert-butyl ether ND 2.5 <br /> Surrogate:a,a,a-Trifluorotoluene 73.3% 70-130 " <br /> Sequoia Analytical-Walnut Creek The results in tlris report apply to the samples analyzed i n accordance with the chain of <br /> custody document This analytical report rust he reproduced in i is entirety. <br /> an 13,Kemp,Laboratory Director Page 5 of 12 <br />