N.H. Code Admin. R. Env-Wq 1007.04
The percolation test hole shall be dug with horizontal dimensions of 4 to 12 inches and vertical sides to at least 14 inches into the soil layer specified in Env-Wq 1007.02.
Source. (See Revision Notes #1 and #2 at chapter heading for Env-Wq 1000) #11184, eff 10-1-16; ss by #14486, eff 2-1-26, EXPIRES: 2-1-36