If someone knows how this works for certain, I'd welcome the information.
If the piers were inspected on 5/14, when would they have been poured? At what stage would the pier formation have been at the end of workday 5/8? At what stage was it the morning of 5/11?
^^RSBM
Your specific questions require more information than we have. Pier inspections must be made by state qualified engineer who may not exactly be on the contractor's schedule -- you're at his mercy. I think the May dates you cite could be the drilled shaft and rebar inspection, and not the concrete in place inspection which appears to be have been signed off around July 22.
The footings can vary from 24" -36" below finished grade (See Chafee County pdf link below). On average, the timing for inspection would probably be about 7 days or when at 1/2 strength.
Colorado Inspections & Procedures are based on the provisions of the 2015 IRC and 2015 IBC. The following inspections are typically required for a new single-family dwelling, in their normal order of completion.
For illustration purposes, Sections 7 - 11 intentionally omitted. If you glance at Sections 1 -6, take special note that Inspection is typically required PRIOR TO CONCRETE pour. MOO
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From the actual Salida property report, there's an average of 7 days between each inspection for footings, foundation, damproof, and drainage.
The concrete minimum compressive strength of 3000 psi at 28 days. See link for County Minimum Footing/ Foundation Requirements and exceptions.
1. Temporary Electric Construction Pole: The Temporary Electric Construction Pole Inspection is to be made after all temporary wiring to the circuit panel from the meter housing is in place. Installation shall comply with the utility provider's requirements. Be sure to drive the ground rod the full 8 feet, and be certain installations have been made as required in Chapter 35 of the IRC or Article 590 of the 2014 National Electrical Code.
2. Trenches, Footings, Pads, Caissons, and Helical Pier: The Trenches, Footings, Pads, Caissons, and Helical Pier
Inspection is to be made after trenches are excavated, forms are erected, reinforcing steel is in place (in accordance with approved plans), and
prior to any concrete placement. When caissons or helical
piers are used, the inspection shall be made by a qualified, state-licensed engineer. Original stamped and signed engineers reports for caisson/helical pier inspections must be submitted to the Building Safety & Inspection Services office as soon as possible. Rough inspections cannot be scheduled until the engineers inspection report has been received and approved.
3. Foundation Walls and/or Grade Beam Steel Reinforcement: The Foundation Walls and/or Grade Beam Steel Reinforcement Inspection is to be
made after all forms are erected, securely braced, reinforcing steel is in place (in accordance with approved plans), and
prior to placement of any concrete. For masonry foundation walls. This inspection is to be made after all masonry units and steel reinforcement are in place, prior to grouting. The time of the inspection cannot be predicted, so it is recommended that you do not schedule concrete for the day of the inspection.
4. Underground Electrical: The Underground Electrical inspection within the building, is to be
made prior to backfilling or pouring the concrete floor. If the meter housing is mounted on a pole away from the building, the line must be inspected between the meter and the structure to confirm correct conductors and proper burial depth prior to backfilling. See table 300-5, 2014 National Electrical Code for burial depth requirements.
5. Under Slab Plumbing (and Pressure Test): The Under Slab Plumbing (and Pressure Test) Inspection is to be
made prior to back-filling and pouring of the concrete floor. Drain-waste vents require a 5 psi air test or 10 ft. water stack test, and water piping requires a 50 psi air test.
6. Underground Gas Piping (and Pressure Test): The Underground Gas Piping (and Pressure Test) Inspection is to be
made prior to back-filling. Gas piping requires a 10 psi air test for 15 minutes. Minimum required coverage of earth for trenches is 12 inches. Plastic gas piping requires a minimum 18 gauge yellow tracer wire installed adjacent to the pipe that extends above grade at each end. All underground gas piping must be inspected and tested.
Reported Inspections:
11/18/2019 Electrical-TempPower Passed Mike
04/16/2020 Footing Passed Chad
04/23/2020 Foundation Passed Aaron
04/29/2020 Damproof Passed Chad
04/29/2020 Foundation Drainage Passed Mike
05/01/2020 Sewer Line Passed Aaron
05/01/2020 Water Line Passed Aaron
05/06/2020 Footing Passed Chad
05/06/2020 Plumbing-UG Passed Chad
05/11/2020 Insulation-UnderSlab Passed Aaron
05/11/2020 Plumbing-In Floor Tube Passed Aaron
05/14/2020 Caissons/Piers
Failed Aaron
05/15/2020 Caissons/Piers Passed Chad
07/22/2020 Caissons/Piers Passed Aaron
08/03/2020 Gas-Interior Passed Aaron
08/10/2020 Plumbing-Rough In Passed Aaron
08/25/2020 Electrical-Meter Release Passed Mike
08/25/2020 Electrical-RoughIn Passed Mike
08/27/2020 Framing
Failed Chad
08/28/2020 Frame-ReFrame Passed Chad
08/28/2020 Plumbing-In Floor Tube Passed Chad
08/28/2020 Shear Nail Passed Chad
09/02/2020 Gas-Exterior Passed Mike
http://www.chaffeecounty.org/EndUserFiles/64215.pdf