Two things set the work apart here: a good deal of the older frontage was never given a walk at all, and where one does exist the trees standing beside it are older than the city.
Jurupa Valley incorporated in 2011, so Rubidoux, Glen Avon, Pedley and Mira Loma were laid out under Riverside County rules and built to them. Some tracts got a full walk behind the curb, some got one on a single side, and plenty of frontage got none, which is why a run here is often started rather than repaired. Where the concrete does exist it is the same age as the pepper and ash on the parkway, and those trees have had decades to find the damp band under four inches of slab.
The counter that issues the permit is Public Works and Engineering on Limonite Avenue, and the trip to it is ours. What comes back sets the width the run is built to, where it must tie into whatever walk the neighbors already have, and how the frontage is fenced and signed while it is open: a house on a school route is treated differently from one on a cul-de-sac. Where the crossing to a driveway falls inside the run, that section is formed deeper and inspected with the rest.