@farmerman,
Thanks Farmerman.
In the backyard, a large overgrown shrub that took up a large portion of space was removed and the soil just needs to be broken up, amendments added and tilled in. The shrub was removed because it was planted too close to and was starting to impact the cinder block wall between the neighbor's house and ours.
In the front and side yards, there is a layer of decomposed granite on top of either landscaping fabric or landscaping plastic. Underneath that is mostly sand. The plastic area doesn't allow water to soak in and the fabric area keeps rising to the surface as the decomposed granite gets washed away when it rains.
My plan is to remove portions of the plastic and fabric, build a terrace around the bottom slope of the front yard and level it out with amended soil for some flowering plants. Right now, when you water, it just runs down the sandy slope and onto the sidewalk before much of it soaks into the ground. We're losing a lot of the soil via erosion. Amendments will help more plants grow and hold the soil in place. Not much grows there other than junipers. I also want to build some borders around the existing flower beds next to the house and add some soil amendments.
The side yard (we're on a corner lot) is our hot zone and is covered with a 2 inch layer of gravel on top of plastic. Lots of sage, lavenders, Spanish broom, wild thyme and yucca grow there. There is a section that is nothing but gravel and I'd like to build a new bed there along the path to the water spigot. When BBB moved here, the whole property was covered with the black plastic and gravel. She had all the gravel removed in the front and backyards and left it on the side yard.
In the backyard, I've been refreshing the soil in the raised vegetable beds each year with composted leaf mulch and manure. What I'm thinking of doing is recycling some of the depleted soil from the vegetable beds and using it to amend the sandy soil areas next Fall when I refresh the vegetable beds with new mulch and manure. My theory is that recycling the soil in the raised beds should help tamp down the possibility of soil borne diseases when vegetables are planted in the same location year after year.