(1) Above ground climatic loads shall be determined according to MMAH Supplementary Standard SB-1, “Climatic and Seismic Data”.
(2) Except as provided in Sentence (3), below ground exterior environmental loads not described in MMAH Supplementary Standard SB-1, “Climatic and Seismic Data”, shall be determined from existing geological and hydrological data or from site tests.
(3) Where local design and construction practice has shown soil temperature analysis to be unnecessary, soil temperatures need not be determined.