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CAPACITY 25000 g PRECISION UNDERGROUND TANK TESTING RESULTS Patent Pending TANK # D -67-25K-02 PAGE 2 STAT * N/A SHORT REPORT FORM TEST DATE: 4/25/1988 Copyright 1985 NDE TECHNOLOGY, INC. PROPRIETARY COMPUTERIZED PRINTOUT OF DIGITAL LEAKAGE RATE DATA Tank Owner - PACIFIC BELL Tank Number - 02 Measurement # 13 Date of Test 04/25/1988 Time of measurement =12:53:29 Tank Temperature = 64.4801 degrees F Tank Pressure = .1629 psi Basic Tank Volume = 25000.040 Gallons. Temperature Correction - 52.081 Gallons. Pressure Correction - .019 Gallons. Corrected Volume - 25052.140 Gallons. Volume Change - -.0019 Gallons. Expected Level Change = -.14160 inches Measured Level Change - .07760 inches Total Fluid Level - 174.156 inches Primary Apparent Leek = -.003 Gallons. Elapsed time = 00:56:46 Primary Apparent Leak Rate - -.003 Gallons/Hour Geometry Band = -.0000 Gallons/Hour Stratified Expected Level Change = -.414 inches Stratified Apparent Leak - -.007 Gallons. Stratified Apparent Leak Rate = -.007 Gallons/Hour Averaged Measured Level Change - .08530 inches. Averaged Volume Change - -.0024 Gallons. Averaged Expected Level Change - -.17991 inches. Averaged Apparent Leak - -.003 Gallons., Averaged Apparent Leak Rate - -.005 Gallons/Hour. Averaged Stratified Volume Change - -.0029 Gallons. Averaged Expected Stratified Level Change - -.21247 inches. Averaged Stratified Apparent Leak = -.004 Gallons., Averaged Stratified Apparent Leak Rate = -.005 Gallons/Hour. COMPUTERIZED PLOTS OF LEAKAGE RATE DATA _ ♦ P .1000 .0900 .0800 .0700 .0600 .0400 e .0300 m .0200 M .0190 .0 as m m m W N -.0100 .022,00 m -.0300 M -.040 LPj;-TE0$T 0 TI - MINUTES NDE TECHNOLOGY, INC. PROPRIETARY WATT INC. 3131 FAIRHAVEN DRIVE, BAKERSFIELD, CA 93308 (805) 322-9827