I am planning to remove ~450 brick pavers (15 feet x 20 feet from our backyard and plant grass. Under the pavers is a sheet of landscaping fabric, then about 3/4 inch of stone aggregate, then some really rich soil that’s like potting soil – loose. What’s the best way to get rid of / skim the aggregate off the soil below? Then, how do i best prep the soil for seeding? Thank you!!
It is terrific that you are going to remove pavers in favour of planting. Your question about getting rid of the aggregate is one that is better suited to one of the many landscaping companies that specialize in hardscaping. The Landscape Ontario website’s “find a company” feature will help you to contact companies in your area who may be able to advise you on how best to do this: https://landscapeontario.com/find-a-company
The part of your question we can help with relates to your soil. If it is generally loose, it may fall on the sandy loam part of the soil spectrum (with clay being on the other end). Before planting, it is a good idea to amend your soil with both topsoil and organic material. Here is a guide that the Toronto Master Gardeners have produced in partnership with the City of Toronto that can give you some tips about amending your soil: https://torontomastergardeners.ca/wp-content/uploads/2012/07/Improving-Your-Soil-Organically.pdf
In terms of planting grass seed, here is a previous Toronto Master Gardeners post with some good specific information: https://www.torontomastergardeners.ca/askagardener/planting-grass-for-the-first-time-in-backyard/