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i <br /> North State Environmental <br /> 0,0%6k Chemical Waste Disposal •Trucking • Consulting <br /> CERTIFICATE OF ANALYSIS <br /> Quality Control/Quality Assurance <br /> Lab Number: 99-0445 <br /> Client : Alton Geoscience <br /> Project : CHP-Stockton / P0# 25-0740-02 <br /> 30-A Lindberg Ave <br /> Date Reported: 04/07/99 <br /> Gasoline and BTEX by Methods 8015M and 8020 <br /> Reporting MS/MSD <br /> Analyte Method Limit Unit Blank Recovery RPD <br /> Gasoline 8015M 0 . 5 mg/Kg ND 120 10 <br /> Benzene 8020 . 005 mg/Kg ND 125 10 <br /> Ethylbenzene 8020 . 005 mg/Kg ND 115 11 <br /> Toluene 8020 . 005 mg/Kg ND 103 12 <br /> Xylenes 8020 . 010 mg/Kg ND 112 11 <br /> ELAP Certificate N0:1753 <br /> Reviewed andApproved <br /> mi. 4�z <br /> Page 3 of 3 <br /> John A.Murphy,L or tory Director <br /> P. 0 . Box 5624 • South San Francisco , California 94083 • 650-588. 2838 FAX 588 - 1950 <br />