Retain in office until no longer required for administrative purposes and then destroy. 

OR

Transfer records to an electronic format.  Destroy hard copy documents, except those that cannot be reproduced in a legible and readable condition, and upon certification that all records have been successfully entered into an electronic format, and after storing an electronic backup copy in an off-site storage area that meets manufacturer’s recommendations for temperature and humidity controls.
 
Delete electronic records and destroy all below standards when they are no longer required for administrative purposes.  
Amended April 16, 2009