It depends on whether the defendant took a breath test or blood test following their Colorado DUI arrest or if they refused to get a chemical test at all:
Actions of Colorado DUI defendant following arrest
When the defendant receives the express consent affidavit and notice of revocation
Defendant elected to take breath test, which returned a blood alcohol content (BAC) of 0.08% or higherThe arresting officer gives the document to the defendant immediately after the failed breath test. Defendant refused to take a test (and the police then forced him/her to get a blood test)The arresting officer gives the document to the defendant immediately after the refusal. Defendant elected to take a blood test, which returned a blood alcohol content (BAC) of 0.08% or higherThe DMV sends the document to the defendant in the mail, usually a few weeks after the arrest.
Note that all drivers in Colorado are deemed to have given express consent to take a breath or blood test if they are arrested on suspicion of DUI. People who refuse to take a chemical test can be forced to submit to a blood test if the police get a warrant.