The pavilion is supported on 10 reinforced concrete piers, each 20 inches in diameter and extending 4 feet below grade. If this seems to you like a very a substantial structure, you're quite right. The building is classified "assembly", meaning it is designed to hold public gatherings. Think about the sort of weight that would need to be supported if, for instance, a school class were gathered inside, and jumping up and down in unison! This is why these piers look a lot more serious than the ones you might see under your back deck.
Some of the reinforcing bar was donated from another building project in town. Here is a photo of volunteers Darryl and Andrew sending up sparks as they chop the 16 foot lengths of 20M (3/4") bar down to size for our foundation piers.
The contractors arrived early in the morning on Thursday, June 16th, and they worked into the evening to finish the concrete pour. Thank goodness for the long summer light!
Marking out the foundations
The digging begins.
Site visit by geotechnical engineer.
Setting the sonotubes.
A laser level is used to set the pier heights.
An uncommon juxtaposition: the concrete truck passing along the farm road beside the community gardens.
The concrete piers are poured.
... and the metal beam seats are set in place.
The excavator returned to site the next morning to finish backfilling around the piers. Volunteer Dave helped to take care of the finer leveling and backfilling.