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Jack Kemp <br /> November 8, 1999 <br /> Page 2 <br /> 0 Since a matrix spike/matrix spike duplicate analysis was not performed, an assessment of <br /> ' matrix affects cannot be made All LCS recoveries met QC criteria <br /> • Acceptable field and analytical precision was demonstrated by the field duplicate pair <br /> DMW-6IDMW-60 <br /> • According to the laboratory, sample DMW-6 (4x) was diluted due to single peak eluting <br /> around carbon range C-14 <br /> • The peaks present in samples DMW-1, DMW-2, DMW- <br /> 3, and DMW-4 do not match <br /> the diesel standard pattern, consequently, the results have been reported as unknown <br /> hydrocarbons Upon request, the laboratory performed a Northwest CIeanup on the <br /> extract for sample DMW-3 Although the cleanup and subsequent analysis were <br /> performed out of holding time, the cleanup removed the non-petroleum hydrocarbons <br /> (matrix interferences) present in TPH-Diesel range The resulting concentration for <br /> unknown hydrocarbons was less than the method reporting limit of 50 mg/L <br /> • Although the peak patterns present in samples DMW-6, DMW-7, and DMW-60 do not <br /> match the diesel standard and the results have been appropriately reported as unknown <br /> hydrocarbons, the peak patterns appear to represent weathered diesel <br /> These data are acceptable in all other areas of review and are useable for their intended purpose <br /> A 1SACVAL08 713 <br />