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• Section No 14 <br /> Revision No. 0 <br /> Date: September 5, 1991 <br /> Page 4of4 <br /> Historical chemical data on the nature of soil or water conditions in <br /> the study areas will be similarly evaluated against the quality control <br /> procedures outlined in this document. Unless information is available on the <br /> method of sample collection, the analytical methods employed, and the quality <br /> assurance/quality control procedures used, the data point will be assigned a <br /> low level of confidence <br /> Information on subsurface conditions is usually obtained from drillers' <br /> logs The quality of these logs varies from well to well and from driller to <br /> driller On the basis of field experience in the study areas and review of <br /> existing site-specific literature on subsurface conditions, each well log to <br /> be used in interpretative evaluations will be subject to judgment by <br /> experienced hydrogeologists. <br /> Data collected during the investigation should be collected according to <br /> the procedures outlined in this document Any apparent data collection <br /> errors will be identified by evaluation of adherence to the QAPP procedures <br /> and evaluation of the data compared to historical trends If a data point <br /> appears to deviate from an anticipated trend, further investigations into the <br /> collection methodology and QA/QC procedures will be initiated to resolve <br /> questionable data points, pending the conclusion of these evaluations, the <br /> data point may either be accepted with a high or low level of confidence or <br /> rejected <br /> 14-4 <br />