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1 <br /> February 25 , 1992 <br /> ' Due to increased requests for data validation and the use of <br /> analytical data for risk assessment CHEMWEST has recently amended <br /> it' s GC reporting policy to include the reporting of all analytes <br /> ' DETECTED and CONFIRMED by second column in a particular sample, <br /> including all values detected at levels BELOW the listed reporting <br /> limit. while this change will reflect an improved manner of data <br /> ' reporting, consistent with EPA/CLP data reporting criteria, initial <br /> confusion may result due to the lack of this manner of reporting <br /> for similar sates sampled and analyzed in the past. The data base <br /> for a particular sample (site) will an many cases expand <br /> significantly, as numerous analytes will appear at levels below the <br /> reporting limit. we apologize for any inconvenience that may <br /> result, however we feel that the more inclusive CLP lake manner of <br /> ' data reporting will out-weigh initial confusion and potential <br /> discrepancy and will be of greater benefit to the end user of the <br /> data . <br /> Data flags appearing on the individual data report sheets, are <br /> defined as follows: <br /> ' E• Exceeds linear calibration range, (see dilution) <br /> Y: Value not at optimal dalutaon, (see alternate dilution) <br /> X. Matrix interference <br /> J• Estimated value, detected below reporting limits <br /> B: Detected an method blank <br /> ' Z. See�Case Narrative <br /> KIRK POCAN <br /> GC Laboratory Manager <br />