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South Head:I VERTICAL <br /> Starting at the base of Tank Head at Centerline moving up in 4" increments: <br /> UT - 50 Base 0.321 <br /> UT - 51 4" 0.316 <br /> UT - 52 8" 0.300 <br /> UT - 53 12" 0.321 <br /> UT - 54 16" 0.321 <br /> UT - 55 20" 0.322 <br /> UT - 56 24" 0.321 <br /> UT - 57 28" 0.321 <br /> UT - 58 32" 0.321 <br /> UT - 59 36" 0.320 <br /> UT - 60 40" 0.320 <br /> UT - 61 44" 0.317 <br /> UT - 62 48" 0.317 <br /> UT - 63 52" 0.317 <br /> UT - 64 56" 0.316 <br /> UT - 65 60" 0.316 <br /> UT - 66 64" 0.315 <br /> UT - 67 68" 0.316 <br /> UT - 68 72'' 0.317 <br /> Starting point: North End at the knuckle moving over 12" from the last reading. Side readings moved up the L/R sides of tank. <br /> The Bulkheads were assessed staring at the base of the tank at the knuckle and then moving up in 4" increments. <br /> Spacing Between Measurements: <br /> Any 3 Square Inches in 1 sq ft < 50% of original thickness? No CATEGORY 1 AST - 1/4" Steel = .250 <br /> 25% of 1/4" Steel = .0625 <br /> Any area less than 25% of original thickness? No 50% of 1/4" Steel = .125 <br /> 75% of 1/4" Steel = .1875 <br /> Reassess in 5 years to determine corrosion rate. <br />