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SUPERIOR ANALYTICAL LABORATORY, INC <br /> 1555 BURKE UNIT I • SAN FRANCISCO CA 94124 • PHONL (415) 6472081 DOHS #1332 <br /> C E R T I F I C A T E O F A N A L Y S I S <br /> LA2OR4TORY NO 53871 DATE RECEI`JED 07/ 12/91 <br /> CLIENT DAMES & MOORE DATE REPORTED 007/20/91 <br /> CLIENT JOB NO 012 <br /> ANALYSIS FOR BENZENE , TOLUENE , ETHYL BENZENE & XYLENES <br /> by EPA SW-846 Methods 5030 and 8020 <br /> Concentration( ug/kg ) <br /> Ethyl <br /> LABToluene 3enwene 'ylenes <br /> - --------------------- ------ - ------- ------- -------- <br /> # :ample Identification Benzene <br /> TRENCH-1 ND<3 ND< 2 N0< 3 ND< 2 <br /> 1E ND< 3 ND< 3 ND< 3 ND< 3 <br /> 2 TRENCH-2 ND<3 ND< 3 ND< 3 ND<3 <br /> 3 TRENCH <br /> 4 ISLAND- 1 ND< 3 ND<3 ND< 3 ND< 3 <br /> ND< 3 ND<3 ND< C ND<3 <br /> 5 ISLAND-2 <br /> 6 ISLAND ND< 3 ND< 3 ND< 3 ND< 3 <br /> 7 ISLAND-4 ND<3 ND<3 ND<3 ND<3 <br /> ug/kg - parts per billion ( ppb ) <br /> Minimum Detection Limit in Soil Oug/kg <br /> QAQC Summary <br /> Daily Standard run at 20ug/L %Diff 8020 = < 15% <br /> MS/MSD Average Recovery =97o Duplicate RPD <br /> Comments <br /> RiVatory <br /> kDiretcr <br /> L <br /> 1P <br /> OUTSTANDING QUALITY AND SERVICE <br />