Patent ID: 6966984

Claim:
A pre-cast, modular, drive-down pit system for water separation, comprising: a pre-cast water separation unit comprising: opposing sidewalls having forward ends; a floor coextensive with said sidewalls and having a forward end; a front wall extending between said sidewalls and spaced rearward of said sidewall forward ends; an intermediate wall extending between said sidewalls and spaced rearward of said front wall; a rear wall extending between said sidewalls and spaced rearward of said intermediate wall; said sidewalls, said floor and said front wall defining a primary solids separation section; said sidewalls, said floor, said front wall and said intermediate wall defining a secondary separation section; said front wall defining a cutout dam for flow of water from said primary solids separation section to said secondary solids separation section; said sidewalls, said floor, said intermediate wall and said rear wall defining an oil and water separation and pump water collection section; said intermediate wall defining a cutout dam for flow of water from said secondary solids separation section to said oil and water separation and pump water collection section; and opposing pre-cast pit wall units having forward ends and rear ends; said opposing pit wall units being connectable at their rear ends with respective said forward ends of said sidewalls of said water separation unit, said opposing pit wall units defining a drive-down ramp section.