Why the base matters in Berkeley
Loess upland covers this part of the county, and the county soil survey ties pavement damage on many of these soils to low strength and frost action, calling for adequate base plus ditches and culverts. Heavy trucks make it worse by pumping water out of a wet subgrade. We drain and compact before paving.
A cheap bid usually gets cheap somewhere you cannot see. Ask what depth of stone goes down, how thick the asphalt is after rolling, and who fixes it if water still stands.
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 Berkeley estimate is sized to the soil, the traffic and the drainage on your property.