CREATE TABLE table_55866 ("CERCLIS ID" CLOB, "Name" CLOB, "County" CLOB, "Proposed" CLOB, "Listed" CLOB, "Construction completed" CLOB, "Partially deleted" CLOB, "Deleted" CLOB)

What was the Proposed date of the entry that has a CERCLIS ID of al0001058056?
SELECT "Proposed" FROM table_55866 WHERE "CERCLIS ID" = 'al0001058056'
SELECT "Proposed" FROM "table_55866" WHERE "CERCLIS ID" = 'al0001058056'