user: Question: What is the CERCLIS ID of the site in Polk County, with the date 08/04/2009?
Columns: ['CERCLIS ID', 'Name', 'County', 'Partially deleted', 'Deleted']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['FLD980221857', 'Agrico Chemical Co.', 'Escambia', '–', '–']
SQL:

assistant: SELECT "CERCLIS ID" FROM "Table" WHERE "County" = 'Polk' AND "Deleted" = '08/04/2009';