Volunteers The harvest is abundant, but the workers are few. If you would like to volunteer, even one hour a week is helpful! Click the button below to find out more about volunteering! Join Us PSMA is open Monday-Friday 8:00 a.m. to 5:00 p.m. Volunteer opportunities during these hours include: Unpacking, categorizing and shelving incoming supplies. Gathering, assembling and packing outgoing shipments Web design and information systems management Video and media production Pick-up and delivery drivers PMHDC Southwest Medical Aid 720 E. 46th Street, Tucson, Arizona 85713 USA