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ALIO 13 '98 13:27 FP. E 8 E ' SAN FPPNCISCO415 981 0801 TO 12094683433-0033 P.04i15 <br /> L <br /> X by the OSC, Incident Commander or other on-site officials to assist in determination as to <br /> whether an immediate action is necessary. <br /> X to be compared with federal of state MCLs or other regulator limits. <br /> X to define the area of impact of the released hazardous materials. <br /> X to be compared with EPA Preliminary Remedial Guidelines (PRG) or other risk- based <br /> action levels to determine if a chronic health threat exists. <br /> ❑ to confirm that a clean-up of released hazardous materials has achieved the clean-up <br /> goals. <br /> ❑ as definitive confirmatory data for non-definitive (screening) data. <br /> X to be compared to a background level or sample(s). <br /> X Other objectives: <br /> Data generated will also be used as time zero comparative results for future sampling events. <br /> 2.2 Data Quality Objectives <br /> In general, the quality of the data (or lack of quality) should be known and documented <br /> prior to use. The U.S. EPA has divided data into two groups, data of unverifiable <br /> quality and data of verifiable quality. The data of verifiable quality is further divided into <br /> two categories: Definitive methodology data and non-definitive methodology data with <br /> conformation of 10% by Definitive methodology. By definition, all data from analysis by <br /> non-definitive methodologies are considered of unverifiable quality. Note that <br /> unverifiable data is not an indicator of low precision or accuracy! It is only a practical <br /> indicator of QA/QC documentation. Refer to the ERS QAPP for specific DOO <br /> parameters. <br /> Check all appropriate box(es) <br /> 1 X Data will be a used in conjunction with other information by the 'Federal On- <br /> scene Coordinator or Project Manager in order to access the site following the <br /> criteria specified in the National Contingency Plan. (Check all appropriate <br /> boxes.) <br /> li&llkil_w alCctjaSp/US_14-Y7 <br /> 3 <br />