CREATE TABLE table_42320 ("CERCLIS ID" CLOB, "Name" CLOB, "County" CLOB, "Proposed" CLOB, "Listed" CLOB, "Construction completed" CLOB, "Partially deleted" CLOB, "Deleted" CLOB)

When was construction completed that was listed on 09/21/1984 and a Deleted of 11/04/1999?
SELECT "Construction completed" FROM table_42320 WHERE "Listed" = '09/21/1984' AND "Deleted" = '11/04/1999'
SELECT "Construction completed" FROM "table_42320" WHERE "Deleted" = '11/04/1999' AND "Listed" = '09/21/1984'