New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Wq - Water Quality and Quantity Programs
Chapter Env-Wq 1000 - SUBDIVISIONS; INDIVIDUAL SEWAGE DISPOSAL SYSTEMS
Part Env-Wq 1016 - CONSTRUCTION REQUIREMENTS FOR ALL EDA
Section Env-Wq 1016.03 - Excavation

(a) Protect the natural absorption qualities of the soil;

(b) Protect open excavation from storm runoff to prevent the entrance of silt and debris;

(c) Rake all smeared or compacted surfaces to a depth of one inch; and

(d) Remove loose material before the fill or uniform crushed stone is placed or, in the case of chambers or LDGP systems, the sand layer is constructed.