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Attachment 2 <br /> Summary of Performance Estimates <br /> Pipeline Leak Detection System <br /> Used as a <br /> Monthly Monitoring Test <br /> Complete this page if the pipeline leak detection system has been evaluated as an hourly test. <br /> Please complete the first table. Completion of the last three tables is optional. (The last three tables <br /> present the performance of the system for different combinations of thresholds, probabilities of false <br /> alarm,and probabilities of detection. They are useful for comparing the performance of this system to <br /> that of other systems.) <br /> Performance of the Pipeline Leak Detection S stem as Evaluated <br /> Description Leak Rate PD PFA Threshold <br /> ( al/h) I I I ( al/h) <br /> Evaluated System 0.20 1.00 0 0.1364 <br /> EPA Standard 0.20 0.95 1 0.05 N/A <br /> ProbabilitX of False Alarm as a Function of Threshold <br /> Threshold Probability of False Alarm <br /> (La l/h) <br /> Not determined Not determined <br /> Probabili of Detection as a Function of Threshold for a Leak Rate of 0.20 gan <br /> Threshold Probability of Detection <br /> ( al/h) <br /> Not determined Not determined <br /> Smallest Leak Rate that Can be Detected with the Specified Probability of Detection <br /> and Probabilily of False Alarm <br /> Leak Rate Probability of Detection Probability of False Alarm <br /> ( al/h) <br /> Not determined Not determined Not determined <br /> 4 Monthly Monitoring for 0.2 gaUh leaks was not tested by KWA,Inc. Tests with leak rates of 0.1 gaUh were <br /> simulated and were detected by the system when the threshold was set at 0.068 gal/h. The system correctly identified <br /> 100%of the 0.1 gal/h leak simulations and it is therefore assumed that the system will correctly identify 0.2 gaUh leaks <br /> using a threshold of 0.136 gal/h. <br />