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SUPERIOR ANALYTICAL LABORATORY, INC <br />' 1555 A 94124 - PHONE 415 647-2081 S 5 BURKE UNIT I SAN FRANCISCO, C <br />' C E R T I F I C A T E O F A N A L Y S I S <br /> LABORATORY NO. 80720 DATE RECEIVED 04/04/90 <br />' CLIENT Vapor Extraction Technology DATE REPORTED 04/12/90 <br /> CLIENT JOB NO Stockton VES <br />' AIR ANALYSTS by modified NIOSH 1500 FOR TOTAL HYDROCARBONS <br /> & AROMATIC VOLATILE ORGANICS <br />' LAB � 1 <br /> SAMPLE MW-3 <br /> Analyte Vol ( L ) Front ( mg ) Back( mg ) Tot . (nig ) ( mg/m3 ) ( ppm ) <br /> Benzene 10 <0 . 009 <0 . 009 <0 . 009 <0 9 <0 3 <br /> Toluene 10 0 009 <0 009 0 009 0 9 0 2 <br /> Ethyl Benzene 10 <0 009 <0 009 <0 . 009 7 c0 2 <br /> Xylenes 10 0 062 <0 009 0 061 6 1 1 4 <br />' Total Hydrocarbon 10 0 6 <0 1 0 6 60 <br /> IMethod Detection Limit BTEK-0 009 mg <br /> TPH-0 1 rag <br /> QAQC Summary <br /> MS/MSD Average Recovery =109% Duplicate RPD = , 4 <br /> Edward R. 'orale <br /> r o to anager <br /> OUTSTANDING QUALITY AND SERVICE <br />