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North State Environmental Laboratory CA CLAP# 1751 <br /> ` 90 South Spruce Avenue, State V • South San Francisco CA 94080 • (650) 266-4563 • FAX (650) 266-4560 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> Job Number 00-0286 Date Sampled 03/01/2000 <br /> Client Nestern Geo-Engineers Date Analyzed 03/10/2000 <br /> Project R603-OVER-EX Date Reported 03/10/2000 <br /> Volatile Organics by GC/MS Method 8260 <br /> Quality Control/Quality Assurance Summary <br /> Laboratory Number 00-0286 MS/1,7SD RPD <br /> Client ID Blank Recovery <br /> Matrix SOIL SOIL <br /> Analyte Results %Recoveries <br /> ug/Kg <br /> Methyl-t-Butyl Ether ND<50 <br /> 1,1-Dichloroethene ND<5 46 7 <br /> Benzene ND<5 92 2 <br /> Trichloroethene ND<5 82 10 <br /> Toluene ND<5 87 7 <br /> Cnlorobenzene N1<5 99 9 <br /> SUR-Dibromofluoromethane 100% Rec 102/106 4 <br /> R-Toluene--d8 102% Rec 100/101 1 <br /> R-4-Bromofluorobenzene 100% Rec 108/107 1 <br /> Revzec.ed <br /> aj, <br /> pnrwe <br /> �), <br /> John A Murphy <br /> Laboratory Director <br /> • <br /> Page 2 Of 2 <br />