CREATE TABLE table_9431 ("CERCLIS ID" TEXT, "Name" TEXT, "County" TEXT, "Proposed" TEXT, "Listed" TEXT, "Construction completed" TEXT, "Partially deleted" TEXT)

What name was proposed on 09/08/1983 in hillsborough county?
SELECT "Name" FROM table_9431 WHERE "County" = 'hillsborough' AND "Proposed" = '09/08/1983'
SELECT "Name" FROM "table_9431" WHERE "County" = 'hillsborough' AND "Proposed" = '09/08/1983'