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South Head: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.