I am designing a cylindrical water tank with a concrete ring beam. I am attempting to conform to the standards of API and would like to incorporate the subgrade preparation requirements in my specifications. I have portions of the API 650 that reference Section 5.5.6, which I do not have. This section is referenced in Appendix B under B.4.2 "Earth Foundations with a Ringwall". It specifically states, "Tank foundations must be true to the specified plane within the tolerances specified in 5.5.6". What are these tolerances?
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