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O/30/93 18 35 V510 229 07916 ,UPER 1 OR ANALYL I 004 <br /> SUPerior Precision Anna ytical. Inc- <br /> 1555 Burke, Un,t I + Sari Fr,mc,sco, C a0c)rno 94124 ■ (415) 647-2081 / fax 1415) 821 7123 <br /> EPA SW-846 METHOD 8240 - VOLATILE ORGANICS <br /> Quality Assurance and Control Data - Water <br /> Laboratory Number 56983 <br /> Average <br /> Method Spike <br /> Compound Blank PQL Recovery Limits RPD <br /> (ug/L) (ug/L) <br /> Tetrachloroethene; ND<3 3 <br /> 1, 1 2, 2-Tetracl--ethane: ND<3 3 <br /> Toluene: ND<3 3 95 76-125 4% <br /> chlorobenzene: ND<3 3 107% 75-130 3%. <br /> Ethyl Benzene: ND<3 3 <br /> Styrene: ND<3 3 <br /> Xylenes: ND<3 3 <br /> 1, 3-Dichlorobenzene: ND<3 3 <br /> 1, 4-Dichlorobenzene: ND<3 3 <br /> 1, 2-Dichlorobenzene: ND<3 3 <br /> 1, 2-Dichloroethane-d4 : 98% <br /> luene-ds : 1001 <br /> omofluorobenzene: 99$ <br /> Definitions: <br /> ND : Not Detected RPD = Relative Percent Difference <br /> PQL = Practical Quantitation Limit <br /> File No. 56983 <br /> Sen or Chemist <br /> Account Manager <br /> Page 5 of 5 <br /> CFfI�E'fi �c'ti'G �Eurf�S <br />