Rural development: Pad-Ready = site untouched but septic testing has been completed and deemed suitable for building.
Mass Grading Development: Pad-Ready = fill placed, rough grading completed AND tested! Sewer and water hook-ups in place.
Yep. Need to test lifts every 18" to 24". However, in this case, have the excavator and tester dig some test pits to test the lower and mid level. Need to excavate using a scraping method as to not to compact too much while excavating. The tester can then dig another 6 to 4 inches to try and get...
This system looks like an adaquate system for low rainfall amounts. Any high rainfall amounts all bets are off.
I would run a flatter grade 8" instead of a 6" and have the outlet in the 40 gallon at the same invert elevation or slightly above the the outlet elevation of the 6" in the 40 gallon...
I go with a 2% minimum. 8 - 12" sumps in catch basins. I agree with CBs at the edge of the lot. However, these work the best if there is curbing.
Always assume gravel lots may be paved in the future. Therefore, I would plan it with all overland drainage with grass swales but plan for future...