Ground, water and winter in Kirkwood
Upland soils across St. Louis County formed mostly in loess, with cherty limestone residuum to the south and southwest. The county soil survey says local streets on many of these soils need adequate base plus ditches and culverts to handle low strength and frost action. With freeze-thaw winters, we drain first and build the base to match.
Bids are only comparable when they spell out the same things: base depth, compacted thickness, how edges are finished, and where water is meant to go. Ask for those before you pick a number.
Compacted asphaltTypically 2 to 3 in. for a car drive
Stone baseTypically 4 to 8 in., compacted
Drive on itUsually 2 to 3 days, longer in heat
First sealcoatTypically 6 to 12 months after paving
Typical ranges. Your Kirkwood estimate is sized to the soil, the traffic and the drainage on your property.