A) Welding residual stress is not wanted in welded structural members. Mention a heat treatment process for removal of welding residual stress B) Through economic considerations, the optimum proportions of tank diameter (D) and height (H) are influenced by the annual costs per unit area of fabricated tank shell (C1), fabricated tank bottom (C2) and fabricated tank roof (C3), and the annual costs per unit area of tank land area (C4) and installed tank foundation (C5). It is estimated that the cost of tank roof is 2 times the tank bottom cost, and the cost of tank land area is 0.3 of the tank bottom cost. While the cost of tank foundation is estimated at 0.12 of the cost of tank bottom. A designed and installed steel tank has capacity of 63486.52ft3 of oil and a diameter of 58.5ft. If the cost of the tank shell is $150.00, calculate the costs of the tank land area and tank foundation [9 marks]