Section Env-Wq 1019.02 - Design Requirements(a) Hole size shall be within the range of 1/4 inch to 5/8 inch.(b) Maximum allowable hole spacing shall be 6 feet.(c) The perforation at the end of the effluent conduit shall be drilled horizontally in the end cap near the crown of the pipe to facilitate venting.(d) In ISDS with pressure distribution, the lateral spacing of the pipes shall be approximately equal to the perforation spacing, and holes on adjacent laterals shall be staggered so that they lie on the vertices of equilateral triangles.(e) The dosing volume for pressure distribution shall be 5 to 10 times the network pipe volume. If duplicate pumps are not provided, the dosing chamber shall have a reserve capacity above the active dosing volume equal to one day's average flow.(f) The loading rate shall be 0.8 gallons per day per square foot.(g) The dose rate shall be 0.2 gallons per dose per square foot.(h) Basal area requirements shall be based upon the percolation rate as presently applied to conventional systems.(i) Fill material shall be:(1) A medium to coarse textured sand, with an effective size of 0.25 to 2.0 mm., no greater than 5% passing the number 200 sieve, and no particles larger than 3/4 inch; or(2) Materials meeting the ASTM C-33 specification.(j) The separation distances with respect to seasonal high water table, impermeable substratum, and ledge shall be as set forth in Env-Wq 1014.04 and Env-Wq 1014.05.N.H. Code Admin. R. Env-Wq 1019.02
(See Revision Note at chapter heading for Env-Wq 1000) #9086, eff 2-9-08
Amended by Volume XXXVI Number 41, Filed October 13, 2016, Proposed by #11184, Effective 10/1/2016, Expires 10/1/2026.