Coming from someone who used to pave asphalt and run a quality control lab for our company.
In Nebraska we have a mix called "SPL", which is used mostly in parking lots and temporary areas. It is what our local track was paved with.
Each area of the country will have different grades due to the limited supply of materials in the area. Basically they will use what ever is around and cheap. Now the STATE DOT requires certain standards for highways and interstates.
Look for a total A/C (ASPHALT CEMENT) content of 5.75% (+/- .25%).
Our SPL mix was made up of:
5%-1/2" Limestone- mined from quarries
28%-47b Gravel- mined from riverbed areas (3/8" and smaller round rock)
10%-Sand- Fine sand
40%-Recycled Asphalt millings (helps cost since their is usually about 4% oil achieved from recycle millings)
12%-Screenings- product of mining limestone (dusty limestone about 1.7% dust)
Not sure what they have for mixes in GA.
Becareful when requesting to use recycled asphalt millings because a lot of companies will mix dirty shitty millings in to get rid of them.
There is alot that goes into a mix... But take this into consideration...
You want it smooth and about 4.5" thick. (2 lifts... 4" bottom lift + 2" top lift... Compaction is roughly 1/4" per Inch of asphalt. Will give you 4.5" compacted.)
Less Oil usually will cause the Asphalt to break up quicker.
More Oil will help prevent cracking.
TOO much Oil will cause major issues.
Crown your track for water run off.
Your traffic is no where close to real life so your track should hold up excellent with a parking lot mix.
Quick Info for you....