Laserfiche WebLink
9000030A11 CON-27 <br /> 4.3 WASTE OIL PARAMETERS <br /> Soil which may have been impacted by waste oils or the pesticide <br /> Supreme Oil will be analyzed for total petroleum hydrocarbons (as gasoline <br /> and as diesel ) , and benzene, toluene, ethylbenzene, and xylenes (BTEX) . <br /> Analysis for total petroleum hydrocarbons will provide the most reliable <br /> data for evaluating whether the soil samples have been impacted by Supreme <br /> Oil or by waste oils. BTEX constituents will be used to further assess the <br /> TPH concentrations. Total concentrations will be measured for each <br /> constituent. <br /> 4.4 QUALITY ASSURANCE/QUALITY CONTROL <br /> A quality assurance/quality control (QA/QC) plan will be implemented to <br /> ensure that the chemical analysis data are of sufficient quality to meet <br /> project goals. <br /> Sampling precision for soil samples will be addressed through the <br /> analysis of split samples that will be prepared in the laboratory. From <br /> one in ten samples two cores from the samples will be obtained by the <br /> laboratory and analyzed for all parameters. The percent relative differ- <br /> ence between sample duplicate pairs will be reported and used to assess <br /> laboratory and sampling variability. Matrix spike recovery analyses are <br /> performed in order to evaluate the efficiency of the sample extraction and <br /> analysis procedures. One matrix spike sample for every ten soil samples <br /> will be analyzed. Matrix spike recoveries will be checked so that they are <br /> within acceptable range. <br /> All laboratory data will be supplied with the required QA/QC documen- <br /> tation. Data will be assessed for overall quality and reanalyses will be <br /> performed where necessary. <br /> 4-4 <br />