Table: operation_hardtack_ii
Columns: name
location
elevation_height
delivery
purpose
yield

Question: What was the locaction of the Evans test blast?
SQL: SELECT "location" FROM operation_hardtack_ii WHERE "name" = 'evans'

Question: What was the yield for a blast that was in nts area 3s?
SQL: SELECT "yield" FROM operation_hardtack_ii WHERE "location" = 'nts area 3s'

Question: What was the purpose of the Quay test blast?
SQL: SELECT "purpose" FROM operation_hardtack_ii WHERE "name" = 'quay'