New to the site. I glad I found you guys

[ESVA]

Hi Everyone. I do on-site waste water disposal design. Im wondering if I'm in the right place. We do alot of secondary treatment systems and drip dispersal etc but all for residential or small commercial stuff.

 

[BarryEng]

Have a look at thread181-27567 for info on STEP systems.
There is info there for you to find 'onsite wastewater treatment collection & treatment' manual. The manual is available on the EPA USA web site.