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North State Environmental <br /> Chemical Waste Disposal 'trucking Consulting <br /> CERTIFICATE OF ANALYSIS <br /> Quality Control/Quality Assurance <br /> Lab Number 99-0447 <br /> Client Alton Geoscience <br /> Project PO#25-0740-02 / CHP-Tracy <br /> Date Reported 04/02/99 <br /> Gasoline and BTEX by Methods 8015M and 8020 <br /> Reporting MS/MSD <br /> Ll&a1yte Method Limit Unit Blank Recovery RPD <br /> Gasoline 8015M 50 ug/L ND 117 5 <br /> Benzene 8020 0 5 ug/L ND 117 2 <br /> Ethylbenzene 8020 0 5 ug/L ND 91 17 <br /> Toluene 8020 0 5 ug/L ND 106 2 <br /> Xylenes 8020 1 0 ug/L ND 103 2 <br /> Gasoline 8015M 0 5 mg/Kg ND 109 5 <br /> Benzene 8020 005 mg/Kg ND 114 3 <br /> Ethylbenzene 8020 005 mg/Kg ND 94 1 <br /> Toluene 8020 005 mg/Kg ND 104 3 <br /> Xylenes 8020 010 mg/Kg ND 99 2 <br /> FLAP Certificate NO 1753 <br /> dewed and Approved <br /> i <br /> Page 5 of 5 <br /> John A Murphy,La ratory Director <br /> P 0 Box 5624 • South San Francisco, California 94083 • 650-588-2838 FAX 588- 1950 <br />