Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_21821014_1 ( installation_date VARCHAR, chapter VARCHAR )

### Question ###
What is the installation date for the Delta Chapter?

### Accurate SQL ###

SELECT installation_date FROM table_21821014_1 WHERE chapter = "Delta"