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Detection Criterion <br /> 24. What threshold is used to determine whether the pipeline is leaking? <br /> (in the unites used by the measurement system) <br /> 0.068ag 1/h(Annual Mode) ®(in gal/h) <br /> 0.136 ag l/h(MonthlyModef (in gal/h) <br /> 2.5 gal/h(Hourly Modelo (in gal/h) <br /> 25. Is a multiple-test sequence used to determine whether the pipeline is leaking? <br /> ( )yes (If yes, answer the three questions below) <br /> (X)no (If no, skip the three questions below) <br /> How many tests are conducted? <br /> How many tests are required before a leak can be declared? <br /> What is the time between tests? <br /> (Enter 0 if the tests are conducted one after the other.) <br /> Calibration <br /> 26. How frequently are the sensor systems calibrated? <br /> ( )never <br /> ( )before each test <br /> ( )weekly <br /> ( )monthly <br /> ( ) semi-annually <br /> (X)yearly or less frequently <br /> 3Monthly Monitoring for 0.2 gal/h leaks was not tested by KWA,Inc. Tests with leak rates of 0.1 gal/h 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 gal/h leaks <br /> using a threshold of 0.136 gal/h. <br /> 4 Three previous evaluations were conducted on versions of the LD-2000 for Hourly Testing. Evaluation <br /> reports written by KWA,Inc.for the following models of the LD-2000 are available from Vaporless Manufacturing: <br /> LD-2000 and LD-2000S, 11/19/90;LD-2000E and LD-2000E-S, 12/11/92;LD-2000T and LD-2000T-S,7/13/93. <br /> Description-Pipeline Leak Detection System Page 5 of 5 <br />