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CASE NARRATIVE <br /> ' This Case Narrative applies to the data from the analysis of <br /> EDB by EPA Method 8010 for CHEMWEST Ticket number 9501 . <br /> ' All Blanks contained no analytes at or above the reporting <br /> limit for each analyte. <br /> ' The linear regression calculation for the initial calibration <br /> met required criteria <br /> Continuing calibration standards were verified and met <br /> ' acceptance criteria. <br /> Matrix interfering compounds suppressed recoveries of the high <br /> ' boiling surrogate orthcchlorotoluene in both samples. This is <br /> further supported by the excellent blank spike surrogate <br /> recovery, and the low matrix spike recovery results. Matrix <br /> spike results also reveal that the matrix interferant is <br /> selective in nature, apparently suppressing only chlorobenzene, <br /> the dichlorobenzenes, and the surrogate orthochlorotoluene. <br /> ?Matrix spike recoveries for EDB are 130% and 123% . <br /> Therefore these findings support the non detect findings for <br /> EDB in both samples at the normal low reporting limit of 1. 0 <br /> ' ug/L, in spite of the suppressed surrogate findings . <br /> i <br /> S� <br /> ' Kirk Pocan Date <br /> GC Laboratory Manager <br /> 1 <br />