Sounds like the UC Application verification requests went out yesterday (1/2/2018). Check the email address associated with your UC Application and be sure to check your spam/junk folder as well. The verification requests supposedly go out to approximately 10% of the applicant pool (both freshman and transfer applicants; randomly selected).
If you received a request, respond before the stated deadline; not responding will cause your UC Application to be canceled. Review the instructions carefully for examples of acceptable verification documents. If you are unable to provide proof for the selected item, reply to the request with a clear explanation of the reason(s). If the explanation is deemed acceptable, the UCs will choose a different item to verify.
The verification process does NOT delay review of your UC Application. Your application is being reviewed separately by each UC campus. The verification results are checked before admission decisions are sent out (admission decisions for those who failed to provide proof will be tossed).
Remember that this is a data verification request; anything that can definitively prove your participation will do (within the parameters of the instructions). There’s no need to go out of your way to get glowing recommendation letters, since the people reviewing the verification forms do NOT make admission decisions.
If a letter from someone is necessary to prove your participation, it’s perfectly fine that the letter just regurgitates the information on your UC Application. For example:
RE: UC Application Verification
To Whom It May Concern:
Jane Doe participated in ABC Club from ninth grade to twelfth grade. She served as vice president of the club in eleventh grade and is currently serving as the president of the club. Please feel free to contact me at (213) 555-1234 if you require additional information.
Faculty Advisor, ABC Club
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