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,CAPACITY 2,500 g PRECIS UNDERGROUND TANK TESTIN ESULTS Patent Pending TANK Fld. Off. PAGE 2 STAT N/A SHORT REPORT FORM — TEST PROCEDURES TEST DATE: 07/30/1987 Copyright 1985 NDE TECHNOLOGY, INC. PROPRIETARY COMPUTERIZED PRINTOUT OF DIGITAL LEAKAGE RATE DATA Tank Owner - CA. WATER SERVICE CO. Tank Number - FIELD OFFICE Measurement 4 30 Date of Test 07/30/1987 Time of measurement =02:59:1S Tank Temperature 85.0566 degrees F Tank Pressure - .2124 psi Basic Tank Volume 2500.175 Gallons. Temperature Correction = 42.599 Gallons. Pressure Correction = .003 Gallons. Corrected Volume 2542.777 Gallons. Volume Change = .0219 Gallons. Expected Level Change = .53793 inches Measured Level Change = -.73163 inches Total Fluid Level = 99.771 inches Primary Apparent Leak = .052 Gallons. Elapsed time = 00:56:28 Primary Apparent Leak Rate - .055 Gallons/Hour Geometry Band - .0005 Gallons/Hour Secondary Expected Level Change = .538 inches ,Secondary Apparent Leak = -.037 Gallons. Secondary Apparent Leak Rate = -.039 Gallons/Hour Stratified Expected Level Change .516 inches Stratified Apparent Leak = .051 Gallons. Stratified Apparent Leak Rate = .054 Gallons/Hour Averaged Measured Level Change -.84420 inches. Averaged Volume Change = -.0097 Gallons. Averaged Expected Level Change - -.23752 inches. Averaged Apparent Leak = .025 Gallons. . Averaged Apparent Leak Rate = .026 Gallons/Hour. Averaged Stratified Volume Change - .0031 Gallons. Averaged Expected Stratified Level Change = 07665 inches. Averaged Stratified Apparent Leak = .038 Gallons— Averaged Stratified Apparent Leak Rate .040 Gallons/Hour. COMPUTERIZED PLOTS OF LEAKAGE RATE DATA .1.800 r' P P 0 - -.20 l -.;;00000 -•-i,,r"�� -.4000 -.5000 -.6000 r700 1 -� it 1030 2000 3000 400© .5000 T NDE TECHNOLOGY, INC PROPRIETARY WATT INC. 3131 FAIRHAVEN DRIVE., BAKERSFIELD, CA 93308 (805) 322-9827