Welcome to the Board ScottinGA. 2,000 pound soil refers to bearing capacity, what you need is the classification from 405 (the unified soil classification designation). That said, most of the classifications in the 2,000 pound range are in the lower section of class 1 soils and a couple that are class 2. ALL have low expansion potential, that's the good news. Low expansion potential means it won't push too hard on the walls when it rains (good to medium drainage characteristics). Probably going to land in the first or second set of wall conditions in Table R404.1.1(1) (table 5 would be for concrete, not masonry...). The three factors that are needed are total wall height, unbalanced backfill height and soil classification. For example, SW and SP soils would allow an 8" plain masonry wall as tall as 9' provided backfill height is limited to 5' or less. The SM-SC, GM and GC soils would only allow 8" plain masonry at 9' tall to have a maximum of 4' of unbalanced backfill. Conversely, a 6' wall with those soils would allow 6' and 5' unbalanced backfill respectively.
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